that makes good sense to draw everything out like that and also show it to someone else who knows more than I do,,thanks for you're time,,,regards::::Bill R.................................

Thank you very much for this very informative training.

Fantastic video education!!! Thank you

Hi I have a lot of questions about solar energy and sure I will going on with watching you videos and visit your site to know more about that..because I want to start my own business in this field...thanks a lot and I appreciate your efforts wish a nice and happy day for you

Amazing explanation thank you so much

thanks for your efforts and this amount of information .....Keep going

👏👏👏👏 love your channel!

Thank you for the video .

Any benefits to having duel battery banks say 420ah in one and 420 ah in the other and having the opportunity to put the both together for 840ah ?

Thanks

I need a bit of help doing it the other way around please. I am looking at buying a battery bank with 16Kva batterys (48volt system). My max usage is about 3000watts per hour. My non electrical head tells me its about 10hours ?? Thanks

Thanks a lot for those very clear tutorials. Why do you restrict your battery bank voltage to 48Vdc? Low voltage = high current = high fire hazard or high cost (high gauge)... I may come up with a silly idea, but I'm considering a solution enabling both power and water supply (to a water tower) from the same PV array, but using a solar pump inverter in order to preserve my batteries, the most expensive part in all this... Pump inverters usually need a quite high DC input. We do not need to pump water like seven eleven 24h X 7 days... so the idea is to have a PV array that can be reconfigured from 2 strings of 6 panels in series (250W-60) = POWER into one string of 12 panels in series to get that high voltage = WATER. The MPPT controller shall be able to handle 300Vdc PV input, >3000W, and charge a 96V battery bank. Voc=37.1 Vdc, %/°C = -0.32%, t°=5°C, =>Voc=39.47Vdc x 6 = 236.85Vdc W input Max irradiance = irradiance at noon Max t° 65° Pmax 250W %/°C = -0.47% P65° = 2,436W; 2,436W ÷ 96V= 25.4A => 30A. I can achieve the reconfiguration with two DC Isolator Switches 4 Poles I would not be able to do that with a 100V or 150V DC max MPPT controller, the switching POWER => WATER would be more tricky... Some Morningstar products accept up to 600VDC PV input...

Would you take into consideration the battery efficiency?

I just recently noticed something,,, I'm very new to Solar I studied up on all this stuff then hooked up my 4 golf cart batteries 2 strings I hooked positive and negative together on two batteries then I hooked up the other 2 batterys the same way, I then connected the first string to the second string by way of hooking up the negatives together,,,,well in all my excitement about everything I then hooked up the charge controller,,,real nice pro star ps 30 m,,,then my panels,,,made sure everything was fused and grounded,,,,got a real nice samlex pst 300,,,works great,,,well the other day I was checking the water level in the batterys and got to looking around and seen that I had forgot to hook up the the other side of the strings+pos.from one string to the other.?????I was and am hooked up across the bank diagonally it was getting 12 volts and still am,,,well after I made the correction I found my self wondering how was it able to work like that???was I only getting amps from one string???anyone know please feel free to enlighten me,the only thing connecting the strings were the_negative from one string to the other,,,,idk,whatever you do especially if you are new don't be overcome by the excitement of what you're doing take time to really look at things good and maybe get a friend for a second set of eyes to look at it too that's what I've done now,,,anyhow thought I would chime in on that

Amy, step F: Determine total number of batteries needed. The formula should be number of parallel strings that is 2 times number of batteries in each series string.

how did you convert Temp into multiplier?

@Jac Wolf - I can't reply to your comment, your settings may not allow it. So, in case you read the other comments, I'm assuming you mean 16kWh battery bank. If so, figuring 50% depth of discharge, that leaves you 8kWh or 8000Wh / 3000W load = 2.6 hours. That's not including other losses like inverter inefficiencies and temperature compensation.

thank you for explaing about the 2 paralell strings. i didnt know and did 8 car battery that way. i got 12 volt inverters, so i think i'll run 2 strings of 48 volt, and tap into one battery on each leg. got plenty of controllers to charge for 48 volt

hi thanks for the calculation. I have one doubt, how did u end up picking up 48 V?? Was that just your choice? Could i have chosen a 24V system voltage. So in that case it would have 16,986 Wh divided by 24V and than i would have carried on with other calculations.? Would that have been ok as well ?

How many twelve volt battery's does it take 35 amps five hours to charge ? Thanks

now i understand thanks

awesome

Amy - I am trying to reach the technical desk at altE because we may need to upgrade/add another pre-wired SW4048 to our system. We need to charge (2) Absolyte GX 48vot/2,000 Amp hour Battery banks. Please help direct us if you are able. Thank you.

Amy, StepD: Determine number of series strings should be changed to Determine minimum battery capacity .

I have 4_6 volt golf cart batterys 4_100 watt panels,morning star charge controller ps30m,the batterys are 188amp hour excide,I use 12 volts as much as possible,I use a 300watt samlex pst sine wave inverter,and I also have a few different generators,I want to know,,,can I safely add 4 more batteries wired to same as I have no series parallel so I'll have to series parallels instead of the one so I can have more TV watching time on the weekend and other things can I do this without hurting the bank(battery),, I assume it would be safe to do

Does it help or hinder to cross-connect battery banks in parallel, so that the intermediate voltages throughout the parallel groups are equalized? What I mean: Suppose I have a 2x2 battery bank. Batteries 1 and 2 are in series. Batteries 3 & 4 are in series. Batteries 1 and 3 are the most negative batteries, with their negatives connected. Batteries 2 and 4 are the most positive batteries, with their positives connected. Should I connect the positive of battery 3, to the positive of battery 1, in the above bank? What are the advantages / disadvantages of doing this?

On the battery bank sizing: example (part 1), do you also need to take into account the charge controller efficiency?

I have 10 300w panels about 30 ft from the garage I'm trying to figure out if I should put the inverter batteries controller in a shed next to the panels and run AC to the garage or what I would rather do is have inverter batteries controller in the garage. What size wire would I need for 30ft run? Can't find that info anywhere. Love your videos!

I will live in Becket, ma,, should I locate my battery bank in a outdoor shed or in a unheated room in my house that I can ventilate to the outside?So I have seen off grid'ers that have successful setups with a very large battery bank, like Justin Case on youtube, why is there a no more than three bank rule? best

@2:32 min: how Pararell limitation come from?.. if i can't wire only in 2 string (such as 7-10Kw...maybe 4 or 5 up). how many amount of Pararell string appropriate to design ?

I live in the Caribbean where we get around 5 - 6 hours of intense sun a day based on maps. I want to run a 50watt deep freezer for 8 hours a day (400 WH) using a 12v, 2000watt inverter with a PWM controller. Based on two days without sun, this video's calculation recommends a 8000 Ah battery bank yet only 119 watt solar panel! In areas such as the Caribbean, with many hours of reliable sun, can you reduce the size of the battery bank and increase the solar panels when appliances, like a fridge, are run only during peak hours like from 9am to 4pm?

hi there, can you clear something up for me. I am trying to figure out an equation for my battery bank. If I want to find out the amount of amps that my 140 watt tv uses, do I need to divide 140 watts by 240v ac(as this is what my inverter produces) Or do I divide 140 watts by 12v (my battery voltage). my battery bank is 115 amp hours so I want to know how long I can run the television for. thanks!

Δηλαδή η αντλία θερμότητας με το ηλιακό δουλεύει μόνο για οταν χρειαστεί να ζεστάνει το νερό οταν δεν φθάνει από το ηλιακό; Η το ζεστο νερό μπορεί να μπει και στο κύκλωμα των σωμάτων να ζεσταίνει το νερό ;

I just say something about sizing the battery bank by array size controller max out out amp and voltage. ie...2k array, 79 amp max out put controller and 24 battery bank not up to par? (2000 79x24= 1896) by what I heard a 36v or higher voltage bank should be used? Is this correct?

can we use 2 24v 400ah batteries in series (2*24)*400=19200wh? from this method we can use 2 batteries instead of 16batteries 6v.

For note I have an 8000 watt 12 volt inverter what is 16000 surge capability.

If I'm understanding your video correctly, I should never have more than two batteries in parallel? WOW! I've seen dozens of videos where battery banks have 10 or even 20 batteries in parallel. Are they all doing it wrong? I currently have a bank of 10, 12 volt batteries wired as two in series and five in parallel to get to 24 volts. Is this really a bad thing?

Great

What about BMS? If you have a BMS then can you run more strings? What about lithium batteries that have a built in BMS? I'm looking at doing a large lithium system with built in BMS running 4 strings...

hi there can u help about battery power capacity. 2×200ah 24volts system. and 2×200ah in 12 volts system are these two set of battery are the same in terms of power capacity if both fully charge which is 4800 watts im curius

hello anyone who knows how to do a 3125AH battery bank capacity with the 2 string that is best adviseable in this video? the highest AH battery i can find online is 1000 in parallel that would be 2000 only. so that is my problem. is there a higher AH battery in the market? if anyone knows please point me the direction website link etc..thank you in advance and very much appreciated whatever help i can get.

Hi Amy, at 3:53 did you mean to say "24v at 400 Ah"?

A village comprising of 100 houses is to be electrified using Solar PV array, a suitable battery bank an Inverter to convert DC to AC, 400 V three phase distribution line and other accessories. 1. There are 20 houses having high consumption with 5 Nos. 10 W lamps, 10 Nos. 8 W lamps three ceiling fans of capacity 60 W each and a 20“ TV of 80 W capacity. 2. There are 50 medium size houses having 3 Nos. 10 W lamps, 5 Nos. 8W lamps, one ceiling fan of 60 W capacity and a 15” TV of 60 W capacity. 3. The balance 30 houses have 2 Nos. 10 W lamps, 4 Nos. 8 W lamps and a 12 “ TV of 30 W capacity. The village is to be given electricity for 1 Hr. in the morning and 3 Hrs. in the evening. The battery is a special deep discharge type battery which can go to a depth of discharge of 80% and the battery is to have an autonomy (should be able to operate independent of the solar PV system) for 2 days. Daily average solar insolation is to be taken as 5.5 kWh/m² throughout the year. Find the capacity of the Solar array using the commercially available solar PV panels of which specifications are given , the DC/AC inverter of which the specifications are attached.Design the battery bank using 200Ah lead acid special deep discharge batteries. Assume a mismatch factor of 95%, Inverter efficiency of 97% and the effective capacity of the solar panel drops by 20% due to ambient temperature throughout the day and the Battery efficiency of 90%..Design a Stand Alone Solar Power system for the village and draw the Lay out Diagram Can you please help me to solve this ? Can I get the answer for this?

Why the required battery capacity have to divide the depth of discharge?

what will be the battery temperature multiplier over 25degree celcius?? will be 1. something or less??

If I use 2V,600A-H, in series. (24No) what will be the WH capacity

Why would I triple the cost of my batteries to get three days capacity when I have a generator?

I think the first cell of the first column and roll of "Step F" should read "Number of parallel strings" and not "Number of series strings"

is it a bad idea to run a George foreman grill or a small microwave on a 12 volt battery bank of I think 372amps hours,,,(4_186amp hour 6_volt golf cart batterys),for 3_5 minutes.a day???or is this honda eu2000i job???

your battery bank must be double the autonomy kwh.so having two bank of 177 Ah 48 v will drain the battery bank to 0 % srate of charge.two banks of 177 Ah 48 v in parallel will add up capacity to 354 Ah 48.which is your required kwh for 3 days.so to achieve DOD of 50% you would need to double up the proposed battery bank.

At 9:35 your math seems wrong. 2,379 x 3 days = 7,137 x 1.19 - 8,493 / .50% = 4,246 Where am I going wrong?

Series strings shortens battery's life more than parallel strings. In series the possibility of overcharging independent cells inside the battery is greater, resulting in premature failing of the pack just because of one cell. Am I wrong?

My batterys are in side

I will go with 1 battery, 48 volt type: 24-85-21 charging 6 hours = 850 aph, after 20 hours = 1340 aph total KW = 64.3 that's 4 days electricity on reserve for charging EV vehicle and night-electricity with AC & pump it only cost $7000 :D Source: www.rapidtables.com/calc/electric/Amp_to_kW_Calculator.htm gbindustrialbattery.com/Forklift_Battery_Sizes_and_Specifications_Zone15.html Remember if you go with those batteries, they required "distilled water" NOT TAP-WATER, batteries cells don't like calcium(

how about 4____L16 batterys and a good 2000watt sine wave inverter,,,@12 volts could you run the George and small microwave,not at the same time,,,,or would 24 volts be better,,,,how many panels would I need to support a 24 volt battery bank made up of 8 ,t105 batterys,,,L16 would probably be better,,,,could you give me the numbers for each type of bank at 24 volts,,,one made up of,t105,,,,and one of L16,batterys,,,and what about charge controller,,,I can go up to 800watts I think on my pro star ps 30at 24volts,,,I have been thinking about buying another ps30,to parallel two for my,372amp hour 12volt bank I have now,,,I'll have to get,4___more,100,watt panels ,,,I'm thinking it would help with overcast days and shading,,,,later if I go to 24 volt,having 2 ,,,ps30 I'll have the capacity or ability to go up to 1600 watts of Solar I think if I'm looking it this right,,,,or I could stay at 12 volts for a while and have 800watts.....

It’s so confusing to me

This professional advocates batteries in parallel. Wrong. You can run separate charge circuits sharing the same solar cells, but don't connect the batteries to each other. Differences in voltage will trash the charges and lifespan of your batteries.

More theories more confusing

Whatever. You are just a dealer trying to pump up sales.

Yur math is out to LUNCH in the worst way. By your numbers the actuall number of batteries you need is 4.

If you are going to teach, learn first.

your battery chemistry is out of date .wet cells and sla batteries are dead tec and a false value .remake the video using lifepo4 batteries please.