I bought the Cheapest Inverter on eBay part 2/2

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knurlgnar24

knurlgnar24

3 жыл бұрын

I Bought the Cheapest 3000W Inverter on eBay - Part 2/2
I wanted an inexpensive 48V to 120V 3kw inverter and had some difficulty finding one that looked legit so I took a chance on an eBay listing. Let's see if this gamble paid off or not.
This is my first video release in half a decade and it shows - and so does the video quality of my old camera. If I get back into making videos more regularly I'll purchase newer equipment. Please let me know if you find this video valuable in terms of information or entertainment. Thanks for watching!
A link to purchase a quality 3000W pure sine inverter that I would highly recommend:
amzn.to/36vrDL0
A link to a low cost budget 3000W inverter:
amzn.to/33A3v7S
Tired of terrible battery chargers? Try this one! You'll need to put a cable and clamps onto it (cut apart a jumper cable) but after trying one of these you'll realize that ordinary consumer style battery chargers are absolute junk. This does NOT desulfate. Powermax sells similar chargers but they do not output the current advertised and are constructed cheaper.
amzn.to/3qEzk9r
FTC Disclosure Statement:
As an Amazon Associate I earn from qualifying purchases. Some links may be affiliate links. I may get a commission if products are purchased using the links provided.
I cannot guarantee against unauthorized modifications of this information or improper use of this information. I assume no liability for property damage or injury incurred as a result of any of the information contained in this video. Be sure to read and follow all safety instructions for any equipment seen or implied in this video, and use safe practices when working with potentially dangerous equipment. No information contained in this video shall create any express or implied warranty or guarantee. Any injury, damage or loss that may result from use of these tools, equipment, or the information contained in this video is the sole responsibility of the user.

Пікірлер: 318
@z1power
@z1power 3 жыл бұрын
knurlgnar is back... Finally something good to come out of 2020!
@jakeharrison2128
@jakeharrison2128 3 жыл бұрын
Now with added girth
@sharik_rahat
@sharik_rahat 3 жыл бұрын
Wow, you still have those salvaged batteries...
@lanceguilin
@lanceguilin 3 жыл бұрын
OMG! Knurlgnar! You're still alive! I was so afraid you'd passed onto the next dimension! Glad to see you're alive and kicking!!!! Hope you're doing well buddy! Stay safe!
@JohnSmith-qd8po
@JohnSmith-qd8po 3 жыл бұрын
"No smoky smoke, that's a good start". Flipping the power switch on for the first time on anything new nowadays is an apprehensive experience.
@knurlgnar24
@knurlgnar24 3 жыл бұрын
And at 48V input exploding FETs are more like a firecracker than the pop you get at 12V. The arc flash from 48V is starting to get into 'it will hurt you' territory! Not PPE range, but getting there.
@garbleduser
@garbleduser 3 жыл бұрын
@@knurlgnar24 When I was doing torcher testing on an Aims 1.5kw spwm pure sine inverter using a refrigerated centrifuge as load, I encountered that popping. The cause turned out to be GATE RESISTORS! The gate resistors were under rated, frying and popping all the mosfet in the boost stage. This mainly happened when the inverter was cold, lowering the RDS of the mosfets. I wound up replacing the mosfets and gate resistors, with MUCH more powerful items. Recalibrating the load capabilities was more difficult. ..
@MikinessAnalog
@MikinessAnalog 3 жыл бұрын
@@knurlgnar24 Isn't 48 volts getting into the actual average "welding" voltage (yes I know it requires the amps as well)
@MegaBaker123
@MegaBaker123 3 жыл бұрын
Couldn't possibly agree more
@rolliebca
@rolliebca 3 жыл бұрын
Wonderful to see part 2 appear so quickly. I found it entertaining and informative. Pleasant surprise to have it perform so well. Looking forward to your next videos. Cheers.
@terrylawrence6772
@terrylawrence6772 3 жыл бұрын
Really happy to see you back on you tube. Thanks for coming back !!!
@ChrisEdwardsRestoration
@ChrisEdwardsRestoration 3 жыл бұрын
Thank you for returning to making videos !!! your knowledge is invaluable and you inspire many please keep making these !!thank you!!!
@kevinroberts781
@kevinroberts781 3 жыл бұрын
Glad to see you making videos again!!!! You are the one that got me started in my battery hobby!! Look forward to seeing more from you!
@tekdragon
@tekdragon 3 жыл бұрын
Wow, seeing a new video from you is an awesome blast from the past!! Your channel, in large part, was the inspiration for me to dive into my 12 volt DC hobby and eventually led to me building a small homebrew off-grid solar system and everything. I learned so much from you and your vids are always entertaining. You had the most badass battery bank/box I ever saw LOL. Anyways, thank you and welcome back man.
@knurlgnar24
@knurlgnar24 3 жыл бұрын
It sounds like you made it further than me! I have long wanted to do an off-grid solar system in my house but the laws are such that it's almost impossible to do it nowadays. Technically this stuff is easy, legally it's a nightmare. So long as I am just doing projects things are OK but if I do something that can be considered a 'permanent install' then I'm in trouble!
@tekdragon
@tekdragon 3 жыл бұрын
@@knurlgnar24 I really appreciate you replying! well my system wasn't running the house or anything, just mostly my tech stuff like radios, laptop, some network gear, tablets/phones, etc. it WAS off-grid in the sense that it was completely independent from the grid though lol. had about 300 watts in solar panels on a stand in the backyard and about 200Ah of battery capacity. i'm guessing you'd need permits and stuff to do a homebrew whole home system. that would make for some epic content for you though, just saying :D
@pierremaltais6465
@pierremaltais6465 3 жыл бұрын
@@knurlgnar24 do you know a good charger to charge nicd pocket plate battery i ve search everywhere and found nothing (something affordable if possible)
@MStrickkk
@MStrickkk 2 жыл бұрын
@@knurlgnar24 Laws prohibit me from doing a DIY home solar project too. However... Laws don't prevent me from installing a solar system onto a box trailer with all the electronics and batteries inside, and running a shore power cord into a generator input on my house. :)
@LastExile1989
@LastExile1989 Жыл бұрын
Same
@rogerthat2538
@rogerthat2538 3 жыл бұрын
I CAN'T BELIEVE YOUR BACK!!!! i love your old content. I learned a lot about inverters from you. Thanks, you're awesome.
@knurlgnar24
@knurlgnar24 3 жыл бұрын
Thanks for the comment CP and thanks for sticking around all these years!
@ekimviewmaster5010
@ekimviewmaster5010 11 ай бұрын
Great video. Facts, semi-scientific tests, real world tests, video showing the guts and the explanation of components was super to see/learn. Thank You
@PuchMaxi
@PuchMaxi 3 жыл бұрын
Thanks for sharing Knurlgnar and welcome back!
@LarryL619
@LarryL619 3 жыл бұрын
I’m so glad to see you back with a new video!
@nomadeenvr2233
@nomadeenvr2233 3 жыл бұрын
Great to see you comeback on KZfaq! Thank a lot.
@Z71GALLA
@Z71GALLA 3 жыл бұрын
So happy to see you doing videos again!!!
@MiamiWebDesign
@MiamiWebDesign 3 жыл бұрын
Great to see you back and great review. That’s a very nice inverter for the money. Thanks.
@uxwbill
@uxwbill 3 жыл бұрын
I am both of surprised and impressed that this inverter worked as well as it did. I do hope you might come back to KZfaq on a somewhat more regular basis.
@jiexilaoshi
@jiexilaoshi 3 жыл бұрын
Thanks for making another inverter review! Got any repair videos coming? I always enjoy your diagnosis of broken inverters. Btw, I always recommend your video to friends who want to learn about battery banks and inverters, you have so much experience. Glad you are making more videos.
@nickush7512
@nickush7512 3 жыл бұрын
Man, you are a brute !! .... we haven't broken it yet, it is performing well above what was expected, so lets try harder !! It makes me grimmice and it makes me smile at the same time :) I am also very grateful for the high quality information that your brutality extracts..... great humour, so many of the questions arrising answered before they are even asked... Always a pleasure: many thanks and all good things your way dude.
@johnbell1859
@johnbell1859 3 жыл бұрын
That’s a great work shop,a little sort out and your back in business nice to see you back. 🇬🇧
@btrapr
@btrapr 2 жыл бұрын
Im so glad to that your back and I look forward to watching your videos. thnx!
@imark7777777
@imark7777777 3 жыл бұрын
It's been awhile not much has changed, I think this was one of the first channels I've subscribed to nice to see something new.
@CHARLES12STRING
@CHARLES12STRING 3 жыл бұрын
welcome back , I was so glad to see the new content , I let the videos play in the side screen with low volume to let the add revenue add up after watching the video :)
@johnk1325
@johnk1325 3 жыл бұрын
Great to see you back after so long. Always loved your videos 👍
@knurlgnar24
@knurlgnar24 3 жыл бұрын
Thank you so much 😀
@nickaustin1424
@nickaustin1424 3 жыл бұрын
I am glad you are back!
@aspendell209
@aspendell209 3 жыл бұрын
Awesome! Glad your back. I learned a lot from your earlier inverter videos. In fact I would have to say you had the best obscure inverter testing and analysis channel on the web. I have missed having you as a resource the last couple years to analyze new (affordable) tech that is becoming available. One suggestion: Try your efficiency test without the charger connected. The extra 8 or 10 volts which that produces on the input DC could conceivably skew the results if they are somehow clipping everything over the rated voltage of 48v. Similar to 120v appliances which are designed to run on anything over 90 Vac, the higher you increase the voltage, the lower the appliances efficiency will be. ~Cheers
@knurlgnar24
@knurlgnar24 3 жыл бұрын
Input voltage definitely could affect the efficiency. I have a really old video where I did this with a xantrex 1500W inverter.
@nixxonnor
@nixxonnor 3 жыл бұрын
Welcome back, knurlgar24. Good to see you are back. We have all missed you a lot.
@mazdalorean
@mazdalorean 3 жыл бұрын
Always enjoy your testing and explanations. Thanks for the show. Joe
@jamest.5001
@jamest.5001 3 жыл бұрын
I'm glad you are at it again, or somewhat at it anyway, I hope you will consider doing a monthly video atleats, I have went back and watched nearly every video!
@Ian-pe9rj
@Ian-pe9rj 3 жыл бұрын
Glad to see you back!
@MrClipper500
@MrClipper500 3 жыл бұрын
He`s Back!!!. Great video. And I use to think all inverters out of China were junk. Keep the videos coming.
@pjshots
@pjshots 3 жыл бұрын
Part 2, oh yeah. Nice one, good to see more stuff.
@AQUATICSLIVE
@AQUATICSLIVE 3 жыл бұрын
Good job man. Got to compliment your vids you go through quite a bit of testing in these. Above and beyond as usual for you.
@paherbst524
@paherbst524 3 жыл бұрын
i truly appreciate your videos. i'm happy to see new content from you.
@spagamoto
@spagamoto 3 жыл бұрын
This would be a great add-on to those 48V electric ride-on mowers! Would be handy around the property.
@knurlgnar24
@knurlgnar24 3 жыл бұрын
Interesting idea!
@squack90
@squack90 3 жыл бұрын
Glad your back!!!
@egn83b
@egn83b 3 жыл бұрын
Thanks for the inverter review. Very impressive review. Nice to see those old batteries still working.
@uncontrollabledogs3791
@uncontrollabledogs3791 9 ай бұрын
Nice real-world testing here. And great video as always🎉
@chadhauze1683
@chadhauze1683 3 жыл бұрын
Welcome back! Great videos as usual. I’ve been trying to find one of those meters with the scope since I first saw yours years ago. So far no luck....
@knurlgnar24
@knurlgnar24 3 жыл бұрын
Yes, they are hard to find even 20 years after I purchased this one. Crazy isn't it that they aren't widely available? It'd be so easy with today's technology. They should be $50 a pop and with higher BW than mine.
@gor4988
@gor4988 3 жыл бұрын
That was (not surprisingly) a very thorough test Great value for $200, Chinese stuff has come a long way Look forward to more of your great vids
@ericknoll3278
@ericknoll3278 3 жыл бұрын
great to see you back awesome video like always hope you have time to do some more
@josephjohnson6626
@josephjohnson6626 3 жыл бұрын
Welcome back, you were missed!
@gd2329j
@gd2329j 3 жыл бұрын
Good seeing you again & thanks for the videos . I'm thinking the long extension helped limit the serge current when starting the big inductive loads . Distractions welcome in 2020 !
@knurlgnar24
@knurlgnar24 3 жыл бұрын
I hadn't thought about that angle - that long extension cords may actually help the surge capability by not tripping the overload limit... It was a combination 12AWG and 14AWG setup and about 50ft if I had to guess so it shouldn't have contributed too much vs a standard 16AWG cord I don't think.
@user-oj5pd2hj9o
@user-oj5pd2hj9o Жыл бұрын
i know its an old video - but thanks for taking your time to make it, that is one very impressive inverter you have there for the price point of view.. crazy
@davida1hiwaaynet
@davida1hiwaaynet 3 жыл бұрын
Very nice inverter, especially at that price! I'm surprised it was able to start the dehumidifier compressor as those have a really stout reactive power startup demand. Also; I'm so happy to see you sharing videos again! I've thoroughly enjoyed your previous videos, and hoped that life would present you with some new video-worthy experiences to share!
@knurlgnar24
@knurlgnar24 3 жыл бұрын
I've had so many video ideas over the years... Most of them boring crap but, hey, I guess that's my specialty!
@volvo09
@volvo09 3 жыл бұрын
I'm impressed with that thing, I really didn't think it would power that dehumidifier!! Not bad for a MSW on the cheap.
@franchisefred4066
@franchisefred4066 Жыл бұрын
I bet it would’ve not lasted 15 minutes until it overloaded 😂
@DennisWintjes2
@DennisWintjes2 3 жыл бұрын
Welcome back. I missed your videos!! Woot! Woot! Would love your opinion on some current pure sine inverters
@MrCtx32
@MrCtx32 3 жыл бұрын
About time!! So glad your back and hopefully you'll stay. Will you need doing more testing like you use to do?
@superbaron01
@superbaron01 3 жыл бұрын
Man glad your back!
@ernstkliveman8476
@ernstkliveman8476 3 жыл бұрын
And here I thought I just wasn't getting your posts...good to see ya.
@johnmcgiv1
@johnmcgiv1 3 жыл бұрын
Very thorough video very well done thank you very much for your time.
@knurlgnar24
@knurlgnar24 3 жыл бұрын
Thanks for watching! Glad it was useful to you.
@matthewmoore54
@matthewmoore54 3 жыл бұрын
I always enjoy your very informative videos, Glad to see you back! Could you test the 12 volt version? Take care and God bless you and your family!
@southpole560
@southpole560 3 жыл бұрын
Hell yeah! I was always wondering when you would make another video again!
@mindshelfpro
@mindshelfpro 3 жыл бұрын
Can you test the pure sine wave inverter now please? Thanks! And great to have you back on YT!
@seantivenan9593
@seantivenan9593 3 жыл бұрын
excellent review and really helpful Thank you 👍👍😊
@ScottDLR
@ScottDLR 3 жыл бұрын
I appreciate the vid. For a cheapo, I'm impressed with its performance. I wouldn't use a MSW for anything with a motor though. Their motors tend to run hot and fail early if you do it very much.
@rpbajb
@rpbajb 3 жыл бұрын
Enjoyable video, as always.
@andriusst
@andriusst 3 жыл бұрын
I like your videos not because of presentation but because information and knowledge you share. Don't worry about the video and audio quality. It is adequate for what you do.
@forthrightnight
@forthrightnight 3 жыл бұрын
Breaking news: knurlgnar gives rave review on cheapest inverter on eBay. "It isn't all that unrespectable." Nice surprise getting the new videos buddy. Cheers from B.C.
@gr1f1th
@gr1f1th 3 жыл бұрын
LOL the Dehumidifier is still kicking huh? Glad to see you back dude! I'd love if you could cover some over/under voltage disabling on interverts as none of these are being built to handle any other chemistry other than Lead acid or LifePo4 voltages.
@knurlgnar24
@knurlgnar24 3 жыл бұрын
I did have to recharge the dehumidifier as it started freezing up, but yup, still kicking. The newer ones don't work as well for this sort of testing. The overvoltage protection is probably best to not mess with as the boost stage of the inverter runs at a fixed ratio. They usually PWM them to avoid excessive no-load consumption but still the overvoltage protection is there to protect that portion of the inverter. As far as undervoltage protection that kind of has the same problem where the fixed ratio ends up being too low to make a good waveform. Many 'true sine' inverters spit out a square wave under max load and low battery voltage already for this reason. I agree, would be nice to have other voltage ranges available!
@gr1f1th
@gr1f1th 3 жыл бұрын
@@knurlgnar24 Cool. I figured there was a pretty significant reason. You're videos have been really helpful so thank you. I know how much effort is needed to make them.
@draggonfly14
@draggonfly14 3 жыл бұрын
I've watched several of your old UPS modification videos and really liked them. very little content like yours on youtube. Very happy to see you back! im actually looking for a cheap way to get something similar, but pure sine wave, be it via converting a UPS or straight up buying a unit. Hope you can review more units like these! (Hopefully pure sine next) Also would suggest trying out LiFePo4 Batteries. just got myself a set and they are waaaay better than Lead acid, especially for High current loads. Was wondering if it is safe to plus two UPS to the same battery bank (like, will the charge circuits destroy each other or is it safe) Thanks again!
@knurlgnar24
@knurlgnar24 3 жыл бұрын
It is safe to use two UPSs on the same battery bank. I have quite a few inverters and videos I could do videos on if I get the motivation.. Thanks for the comment/support. Incendentally I recently purchased a 14kwh LiFePO4 battery bank (parts) from Aliexpress to do a video series on. Not sure if they'll ever come as the delivery date on these things are months out and vendor cancellations are almost a given if prices rise. Nothing but shady stuff over there and nothing reasonably priced is available from reputable manufacturers. yet. I have a two part video series on Lithium vs lead acid you may be interested in if you haven't seen it.
@draggonfly14
@draggonfly14 3 жыл бұрын
@@knurlgnar24 Thank you very much for the reply! i was Specifically worried if there was "decoupling" of the ac and dc components on the UPS Charging circuits, as in, if UPS 1 is plugged into phase 1 and UPS 2 is plugged into Phase 2, will they blow each other up through the "charge circuit" i also just received and installed 20 100Ah liitokala lifepo4 cells in a 8s2P configuration and a 4s1P configuration. so far, I've had good success drawing over 75% of their capacity, with very low voltage sag. my other lead acid depp cycle interstate batteries have died within 2 years, one battery has a shorted cell :( and these never gave me even 50% of the capacity. Your video has definitely motivated me to resume my electrical projects! Thank you very much for being an inspiration!
@battery_solar_ev
@battery_solar_ev 3 жыл бұрын
welcome back dude
@matthewfish6113
@matthewfish6113 3 жыл бұрын
Thank you, you do excellent videos.
@xavierneckor8918
@xavierneckor8918 2 жыл бұрын
Thank you for a great video. Glad to see you back! I see you still have a Cotek inverter. How's it running? Big fan of your inverter videos. It would be great if you could do a video on what to look (e.g. internal design elements) for in a good reliable inverter. I would like know which inverters actually have working short circuit protection.
@knurlgnar24
@knurlgnar24 2 жыл бұрын
Thanks Xavier! I may make more videos in the future but for now I have other obligations. The newer Cotek inverter I have is a decent product. I do like their old ones better and would get one of those if you can find it.
@anthonyregina938
@anthonyregina938 2 жыл бұрын
You really know your sh@t didn’t realize how much you knew about all this! Awesome video. Thanks a lot. Made me feel stupid, lol. Great 2nd video
@falconcastle
@falconcastle 3 жыл бұрын
Nice vid and thorough trials of the unit. Curious, why did you go with 48v system vs other voltage? Is it easier to work with lower amps and better efficiency?
@charlesaec442
@charlesaec442 3 жыл бұрын
very educational to see this video 👍👍👍👐👐🖐️👋
@JT-lq4yd
@JT-lq4yd 3 жыл бұрын
Sweet! Was waiting for part 2. Since this review is done, how about that Cotek unit there?
@knurlgnar24
@knurlgnar24 3 жыл бұрын
You're right, I should make a video on it. I actually have that 4kw model and a 2kw (I think?) model of 48V Cotek so I can compare them to the older style Coteks (which are better unfortunately). Thanks for the suggestion.
@electromechanicalstuff2602
@electromechanicalstuff2602 3 жыл бұрын
Basement use to be just framed. Looks like rooms now 👍
@knurlgnar24
@knurlgnar24 3 жыл бұрын
And before that it was just poured concrete with no insulation! :)
@thonatim5321
@thonatim5321 3 жыл бұрын
knurlgnar24: Thanks for coming back. We missed you. I hope everything is okay with you and your family.
@scroobyx7790
@scroobyx7790 3 жыл бұрын
Very interesting test, do you think you may test the 12v model? I will keep an eye out for that. Thank you
@anthonyvolkman2338
@anthonyvolkman2338 3 жыл бұрын
I really like that inverter now, I may get one!!
@knurlgnar24
@knurlgnar24 3 жыл бұрын
It was definitely a pleasant surprise for me! With low cost inverters you just never know.
@thomasdipaolo2349
@thomasdipaolo2349 3 жыл бұрын
Good stuff. Question, any experience with diagnosing battery management system (bms) on lithium battery?
@brendanwood1540
@brendanwood1540 3 жыл бұрын
Resistor is like slowly opening, or closing, a water valve to avoid water hammer AKA volts. Or electric force.
@captainyak3948
@captainyak3948 3 жыл бұрын
Welcome back! Could you explain that spark that damages the terminals and how to get rid of it? Thanks.
@knurlgnar24
@knurlgnar24 3 жыл бұрын
Nothing special going on with the spark, it's just a matter of short duration high amperage causing a very hot spark. The heat from the spark plasma vaporizes some metal. Spark plugs and relays etc are specially designed to resist ablation but most other devices are not. AC is pretty kind to contacts such as in household light switches but DC can be pretty brutal due to the arc not extinguishing every cycle. DC relays sometimes use cadmium or some similar special contact material to help prolong life. In terms of how to get rid of it, just connect it through a resistance to charge the input caps and then hard connect it. Most any resistor of any value will do. Or a light bulb, pretty much anything with an ohm or more of resistance.
@captainyak3948
@captainyak3948 3 жыл бұрын
@@knurlgnar24 Thank you for taking the time to explain thoroughly...
@PVflying
@PVflying Жыл бұрын
Hi! Have you any thoughts on how I can synchronise the outputs of two cheap single phase inverters so they are two phases of a 3 phase supply? I want to run my ground source heat pump, which needs three phase (but will run on two phases of a 3 phase supply, but won’t run single phase). Both inverters (Mensela IT-1) have a separate control board which generates the sine wave to drive the high power section of the inverter. I wonder if I can somehow drive both output stages from one control board with a phase shift inserted for the second inverter?
@jamesscott1932
@jamesscott1932 3 жыл бұрын
Sounds like me, “I just popped my breaker!”
@8151noname
@8151noname 2 жыл бұрын
You make great video`s
@FixItYerself
@FixItYerself 3 жыл бұрын
you're back!
@wscottald
@wscottald 3 жыл бұрын
I think your videos are great. Just down to earth evaluations simple testing, but also great explanations. I have a question if you don't mind. This is all theoretical but let's say I have a 48v battery bank connected to a 3kw inverter for use when grid power goes out. I also have a 1kw 12v solar array connected to 2 1kw grid tie inverters for assisting grid power. The grid tie inverters are disabled when grid power goes off, but will the grid tie inverters come back online when the 3kw inverter is connected to house wiring to power the house? I know there's a lot of detail I didn't include, but just wondering if grid tie inverters would supplement the 3kw inverter to create a 5kw solution with the additional 2 1kw inverters.
@knurlgnar24
@knurlgnar24 3 жыл бұрын
That's a really good question and one that I haven't though of previously. That could be a major problem as an inverter attempting to backfeed into another inverter will result in major problems - potentially damaging the 3kw inverter since it cannot accept power, only provide it. The short answer is that I would make sure those grid tie inverters don't power up on inverter power, but that's a very interesting question and I don't know exactly what would happen.
@simonmasters3295
@simonmasters3295 3 жыл бұрын
Good practical load testing! I have the same philosophy or design ethos as you. But at 20 minutes in I'm asking is it a 12v or 48v inverter? 1. Cheap inverters and modified sine work, equally expensive inverters require expensive protection 2. Most off grid does not require synchronised 50 or 60 Hz I have a number of 12v inverters running simultaneously and I am planing on adding one of those capacitive jump starters on the leads to the inverters in order to assist with DC voltage drop under inductive AC load conditions.
@knurlgnar24
@knurlgnar24 3 жыл бұрын
I agree, sometimes a cheap inverter is the right tool for the job. A lightning strike, theft, or other disaster is less of an issue plus you don't have to spend as much on security/protection. And many appliances don't really care about waveform. For adding capacitance to the input leads to help with inductive I would suggest being very careful to calculate out the internal resistance of the pack, and how much current it can realistically put out for 500ms (a realistic minimum required for useful surge capability) before the voltage drops more than a volt or two due to cap discharge. I suspect you'll find that better cabling and/or adding another ordinary battery will improve performance more. A good battery has an internal resistance of low single digit milliohms.
@jonathandooling702
@jonathandooling702 3 жыл бұрын
Awesome are you back? Long time since your last video.
@electromechanicalstuff2602
@electromechanicalstuff2602 3 жыл бұрын
His last video was 3 days ago
@jonathandooling702
@jonathandooling702 3 жыл бұрын
@@electromechanicalstuff2602 go look 5 years now👀
@electromechanicalstuff2602
@electromechanicalstuff2602 3 жыл бұрын
@@jonathandooling702 then it was a few months then 5 yrs. I was being mostly sarcastic tho
@scruff7559
@scruff7559 3 жыл бұрын
Welcome back.
@putraadriansyah8082
@putraadriansyah8082 3 жыл бұрын
Hello knurlgnar, can you do a video about the EGS002 pure sine wave inverter module? maybe you're interested using the module :D
@ajw6715
@ajw6715 3 жыл бұрын
How does these modified sine wave inverters work with motors?
@MATT_ELEKTRON
@MATT_ELEKTRON 3 жыл бұрын
Hes back!
@howardescoffery4950
@howardescoffery4950 3 жыл бұрын
All I was thinking the power of a 48v inverter be interesting to match it up with the 12v and 24v models and see how they do, I went 48v a few month ago and will never go back to a 12v system again you see the difference right away even with less batteries I am getting longer work time off the system.
@knurlgnar24
@knurlgnar24 3 жыл бұрын
Hmm, that's not a bad idea. e.g. for this inverter I could purchase the exact same unit but the 12V model and see how it compares... Maybe if I ever get two otherwise identical units where only the input voltage is different!
@fc436
@fc436 5 ай бұрын
for efficiencynyou cant use inductive loads because you cant know the W but the VA. except for pure resistive load that VA and W is the same
@johnconrad5487
@johnconrad5487 3 жыл бұрын
it was pwm'ing so the pulse width became wider as the input voltage went down. Excellent inverter. By the way, this pandemic has made you put on quite a bit of weight! :)
@knurlgnar24
@knurlgnar24 3 жыл бұрын
Nah, me eating poorly and being out of shape did that! This inverter has a fixed ratio boost stage that increases the voltage by about 3:1. It then adjusts the 'ON' period of the cycles to maintain 120V. This is pretty typical of low cost inverters except that this one did an exceptional job of responding to changes quickly yet remaining completely stable in the control loop. I agree, it appears to be well designed that way.
@scottwillow332
@scottwillow332 3 жыл бұрын
Pure sinewave inverters are MORE efficient than a modified sinewave. I purchased a Victron Energy 5kva with built in 120 amp charger. Can even use my old copper cored arc welder with no issues. Cleaner and just as strong as grid power.
@knurlgnar24
@knurlgnar24 3 жыл бұрын
I have a pure sine inverter that is approx 97% efficient. That doesn't mean in general pure sine inverters are more efficient than modified square wave units. The difference between the two is that 'pure sine' inverters switch their output H bridge much faster (more losses) and filter the output through some sort of choke (more losses). All else being equal it will be less efficient. That said 'all else' is rarely equal.
@BrownsSelfStorage
@BrownsSelfStorage 9 ай бұрын
You mede a very helpful video
@knurlgnar24
@knurlgnar24 9 ай бұрын
Thanks!
@Joemama555
@Joemama555 3 жыл бұрын
the printed waveform on the case of the inverter is actually very accurate to the waveform recorded by the potato-vision oscilloscope you had hooked up.. truth in advertising i guess.
@Geardos1
@Geardos1 3 жыл бұрын
very informative
@Joemama555
@Joemama555 3 жыл бұрын
9:45 the in-rush current of a cold, resistive, heating heater will be well above 1500 watts for a 1500 watt heater i bet. so it will spike well above 3500 watts total
@AWIRE_onpc
@AWIRE_onpc 9 ай бұрын
What this inverter pulled off is pretty impressive. Theres another brand you should check out, its called edecoa. They make pure and modified sine wave inverters and they ship the remote with it. *cough* gopower *cough* and I am curios what it can run.
@knurlgnar24
@knurlgnar24 9 ай бұрын
I've seen that brand advertised and have had significant skepticism about it. But that means nothing until they are disassembled, inspected, and tested. Thanks for the recommendation.
@AWIRE_onpc
@AWIRE_onpc 9 ай бұрын
@@knurlgnar24 Bestek also recently released their own line of 1000w and 2000w Pure sine wave inverters
@KentHenry8
@KentHenry8 3 жыл бұрын
Reminds me of my basement battery \ UPS pile-up room
@knurlgnar24
@knurlgnar24 3 жыл бұрын
It's a good room for the soul, isn't it?
@rme0108
@rme0108 Жыл бұрын
could you connect two of those in parallel like you did with the 410 watt ones way back?
@knurlgnar24
@knurlgnar24 Жыл бұрын
Yes, but it wouldn't work as well. At higher power levels like this 3kw inverter there wouldn't be much gain with that method.
@brynnond.6952
@brynnond.6952 3 жыл бұрын
13:27 Good thing I had one of those power meters because my little 500 btu air conditioner would short cycle and the compressor wouldn’t have enough torque to restart and would pull 18 amps at 1900 watts which is crazy
@mwilliamshs
@mwilliamshs 3 жыл бұрын
1900 watts/18 amps=105 volts There's your problem
@forrestgore6874
@forrestgore6874 3 жыл бұрын
Nice video. How do you feel about the modified vs pure sine wave for running a space heater?
@knurlgnar24
@knurlgnar24 3 жыл бұрын
I recommend a modified sine inverter for dedicated linear loads like space heaters. They are less expensive, more reliable, more efficient, and overall simpler devices with less to go wrong. That said if you have any inclination at all to potentially use that inverter for other purposes now or in the future you might want to consider a pure sine inverter just for the flexibility it offers should your situation or needs unexpectedly change.
@forrestgore6874
@forrestgore6874 3 жыл бұрын
Thank you again. Do you by chance know If simple heating pads or heating mats (for starting seedlings) are linear loads? They have no motors.
@MikinessAnalog
@MikinessAnalog 3 жыл бұрын
That would make an "acceptable" off grid cabin power inverter. Acceptable & not great because it is modified sinewave & not pure. There are just some appliances that perform poorly or not at all on modified (like power tool battery chargers & smoke detectors). P.S. Welcome backness big hugz
@knurlgnar24
@knurlgnar24 3 жыл бұрын
It sounds like you know your stuff since you mention smoke detectors! I wouldn't recommend an inverter like this for whole house/cabin use, but for a power tool work truck, emergency backup, or for powering loads that don't care about the waveform it seems to work pretty well.
@MikinessAnalog
@MikinessAnalog 3 жыл бұрын
@@knurlgnar24 If you do not mind being aware during its use, I use a lot of 128VDC (the output of inverter's DC to DC converter). The weakest point in almost all inverters is the inverting stage creating the waveform (after DC / DC converter). You would be surprised it powers any switch mode supply, even desktop computers, though any wall switches require an arc suppressor cap (nature of high DC). Of course we both know it will not power anything "transformer" appliances.
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