Really, in all honesty, I think what most of us want to know is what amp hours mean in practical terms, not technical terms. It's great to know what amp hours mean when purchasing a battery; that's helpful. But what is more helpful is the information I need on a day-to-day basis: "How long can I run my fan, fridge (or whatever) before I drain my battery?" I know that level of detail depends on the load, but that's where specific examples/scenarios are needed. The 400 watt inverter kinda got to this level of practical information, but the video would have been more helpful (practically), if there had been more emphasis on devices/appliances drawing energy from the battery. At least for me, it would have.

Making use of the kzfaq.infoUgkxcJ22tnHH9l1vjdIdEIG27iOG55P7LXI8 reconditioning plan, I just saved 2 auto batteries from being completely junked. The guides were very simple to follow. I wish I would have found this years ago! You may use the guide to recondition any battery type

Thank you. I didn't know what what that other hour rating was. I never thought about the fact that the faster you drain the battery, the more "inefficient" it becomes.

I watched three clips on this topics ..You ware strait forward ,clear simple to the T..Great job..Keep it up..thnx sir

When you use lead-acid batteries in an emergency lighting system. a run-time of one hour is required, ergo one reason for the one hour rating. The rating is known as the amp-hour rating not the amps per twenty hour rating. Twenty hours happens to be the point that gives the best economy. Some manufacturers quote their capacities at the 10 hour rating. Some even put a 1 hour and 5 hour rating on their batteries as well as the 10 and 20 hour ratings. If you look at the spec sheet for some batteries, it will have the number of minutes that you can draw the amps of the amp-hour rating to fully discharge the battery. For example a DiaMec DMD12-100 (12V 100AH) SLA battery has the following specs... 20 hour rate (5.15A) = 103AH, 10 hour rate (10A) = 100AH, 5 hour rate (16A) = 80AH, 1 hour rate (63A) = 63AH, And the time in minutes to fully discharge this battery at 100A = 35 minutes approx (from a graph supplied). It is a lot easier to multiply the amp-hour rating by the battery voltage and work your maths in watt hours when using inverters. At this stage you can set the 50% DoD to get more cycles/lifetime from your battery bank. You also have to understand the efficiencies of your system. Good inverters are roughly 85 to 90% efficient and this must be taken into consideration when designing battery operated systems.. To fully charge a completely discharged 100AH lead-acid battery, you will need to put in 130 amp-hours of charge and this figure will vary a little bit depending on the battery construction and plate chemistry. The reason for the extra energy required is that it is an electro-chemical reaction. You have to convert lead sulfate and dilute sulfuric acid to lead and lead oxide and more concentrated sulfuric acid. If you regularly discharge a deep cycle battery below its 50% DoD, you will end up having fewer cycles or shorter battery life. Please note, I stated "regularly". The Panasonic VRLA Battery Handbook has graphs for battery life (number of complete cycles) and DoD. These figures vary with battery type, style and plate design. Complete discharge = 350 cycles or about a year. 60% DoD = 800 cycles 30% DoD = 1600 cycles The less you make a battery work, the longer it will last. It is plate corrosion that kills most batteries, not sulfation. Lead-acid batteries were invented in 1859 and have remained pretty much the same since then. Some companies have tweaked the chemistry a little to get longer shelf life or reduce grid corrosion and make them less susceptible to heat and vibration failures but the heavier the current draw, the shorter the run time. This is Peukert's Law and was discovered shortly after Gaston Planté invented the batteries. Wikipedia has a very good article abut it.

This video makes all the sense in the world, this is the best video I've ever seen on KZfaq, thanks very much.

Jeff thanks for the explanation on AMP hours that really helps for my portable power generator that I'm building.

Great job man. This was perfect... Short sweet and made absolute sense. Thank you.

Thanks for the explanation of 100ah @ 20hrs. I understand that now and it helps a ton. 👍

Thanks for making this video simple. I understand it more better.

I got bamboozled on the Ah trick for one battery. But!! Now I know, and it’s a cheap lesson. Thanks for the information...

Yeah, very good and understandable. While I view this I gotta realize that the battery is also going to lose about 10 efficiency also because of possible distance of cabling and also heat stress. While these may seem trivial (or not)? The conditions that batteries are tested under and label printing are of the most perfect conditions to boost their usefulness. Thank You for posting critical information here.

That is what I have in my Rpod 179. 4 gc2 6volt batteries in series and parallel with 3 100watt solar panels and a Xantrex HF Freedom 2000watt inverter.

Thank you!

thank you Jeff, best Ah explanation on the InterWebs!

Nice clear explanation, very useful for me. God bless you.

Thank you so much for your Educational..... Now I understand better....👍💪

Thanks, your ah breakdown was very helpful !

The Voltage charts are for at rest or with loads? I've been using a really cheap $100 Excide 115AH deep cycle battery as my starter and house battery for about a year and half. I've taken it down to 11.5v about 50 nights. I am wondering how long it will last. One number that confuses me is Reserve capacity. If my battery is rated 115AH, I presume that means i have about 700WH of usable but have never been able to achieve that. Also If they claim it has a 205 minute reserve capacity @25amp, what does that REALLY mean.. not really (205*12*25)/60 = 1025WH of usable right?? How is it possible that a 12 fridge that is consuming about 40watts took my battery from 12.6v to 12.1v from 9pm to 6am?

Wish I could like this vid twice lol been racking my lil brain trying to figure out ah for soundsystem..

So having a 12v, 40 amp hour lead battery, what happens when I connect my 2000 watt, 12 v inverter and want to run a load of 1 kw microwave for 5 mins and 100 watt lights for six hours?

Can you explain RC (reserve capacity) compared to Ah?

I keep reading that, while a battery might be a 200 amp hour @ 20 hour rate, it’s “usable” amps is a lot less. Why is that? I don’t understand what the relevance of 200 amps is , if it only has half that in “usable” amps.

Can you explain this Can I power a wiper motor at 12v 2.5amp with a power bank output 12v 1.5amp

Thanks, this is perfect, just what I was looking for.

late onto this one.... tyvm for helping out we are plebs but interested... cheers

Thank you . You just answer my question . I'm not a wizard but you did made it easy for me to understand

I bought a 100watt solar system to charge my batteries. I have a 750-1500 watt inverter. I want to be able to run a 700watt coffee maker, 700watt toaster and 700 watt microwave but not at the same time. Can I get bye with one high amp battery.? This setup would be for tent camping.

I am so confused by how complicated batterys can get. I thought agm batterys were always sealed and could not have water added? Do flooded and agm batterys both use the same fluid inside of them?

What I want to know is can I run my frozen yogurt machine that’s 208 one phase that’s rated for at least 27 amps and max 35 amps and LRA is 81.00 I was told that it needs a 8500 watt generator but they’re too loud so is it possible to run in batteries for about 10 hours a day

I have 24v 7 amp battery for power wheels can I replace it for 24v 12 amp?

Is there a relationship between amps and torque for an electric car?

If you are using AGM firefly batteries with DOD or around 95% would you still divide by as much as 2 for a margin of safety when calculating Amp hrs and runtime?

Hello i really love the video plese sir if i have a freezer who pull230 watt 3-12w bulb=36w, 1 fan 60w, 1 flat screen tv 48w who make a total of 364watts. I know 500 w inverter should be able to handle the wattage, what size of battery bank i need for this to run them for 6 hours please

So if I'm using a 12 volt 3500w inverter on those same batteries...I would get less hours of use?

Thanks for the information. A question though. if I have a RV Fridge that pulls 5 amp hours, and two 6 volt batteries rated for 225 amp hours, would the calculation be: (225x2)/2=225/10 hours=22.5 amps draw. this figure seems to say that I would not have a problem boon docking overnight with the fridge running. Is this correct? Thanks.

so you can only use HALF the battery? how often can you go below before sustaining damage? what about reserve capacity?

you sir have earned my subscription. great information

oi oi oi, can u pls explain the calculations with examples (using the same numbers u talked about in the vid) typed in the description, as it still sounded confusing as u verbally explained it. Thank YOU in advance.

Great video! So if I have a 12v 7Ah/20 hour battery and I want to run a 13A 120v electric mower Probably I can ‘t do it.

Please could you advise..... I have a 7.2AH (20HR) battery. What charger would I need to charge this battery?

Hi I have 2 55ah Duracell 12v agm batteries in my van hooked up together being charged by 700 watts worth of solar on the roof, I am in the market for getting an inverter possibly just a 500 watt 12 volt hookup, my question is what is the total wattage my system currently makes? Would it be (55x2) x 24 volts= 2640 watts? I’m trying to see how long my battery can last before I run out of power, for my off grid set up and want to know if I can even run something like my gaming console (90 watts per hour I think) thanks so much for any feed back

can i use cranking marine battery and use different cycle battery together for my amplifier

Sir..i have a 12v inverter..and its for electric fishing.. And it says current 32ah. What does it mean?do i nid to use 12v 32ahmp battery?

Could I ask a question and it’s a tricky one , I am about to move into a small boat with a plan to use 2 , 110 aph 12 v deep cycle battery’s to power a 40lbs electric trolling motor and on the motor there are 5 settings 1 through to 5 and 3 reverse settings, iv done a little research but I am a beginner with all this , to my knowledge it’s draws at 20w but I’m not sure if that’s per hour ? And I need to achieve atleast 7 hours of travel per day

Jeff, I love your videos! Keep it up brother

It sounds like you are explaining Ah's for batteries that are not getting charged up by solar/wind or whatever means. Wouldn't the batteries have more Ah's for a 20 hour period if they are being charged daily?

Very nicely explained!

Jeff I have watched this video a couple of times . My question . If you have a 5000 btu a/c . 110 volt . The a/c is 1800 watt to start and would run at 1500 watts. With a 3000 watt inverter that would 250 amps. You could run the a/c for 3 hours .Am I right .Thank You .

Thanks for the explanations, very helpful

That helped....giving me a headache!!!!

I have a 24 volt system and both batteries have a 205 rc. so would I combine those to get my amp hours or run time. I'm using about 30 amps

Please help. My espresso machine is 3,000 watts. I want to run my espresso machine using a deep cycle battery. Can I get a 12v 100Ah AGM deep cycle battery and pair it with 4,000 watts inverter? If it's possible and if my calculation is correct will it give me at least 15 hours of power? Thank you sir.

Why is Paul McCartney telling me about battery

How batteries and of which size is required to run 500w pv module.

Thank you for the helpful information. I have a question, though. If you're running something that only draws 200 watts through a 1000 watt inverter, will you be drawing 200 or 1000 watts from the battery? You mentioned the size of the inverter affecting the draw, so I want to make sure I'm using the right inverter with the right appliance. If my 1000 watt inverter is overkill, then maybe I should pick up a smaller one as well. Thanks for any advice you might have. Sorry if it's a dumb question. I'm a total noob.

Merry Christmas!

Thank you for the explanation. I want to use AGM Battery for a Grow Indoor System. The AGM battery will only need to power for 16 hours a day a LED Spectrum Lamp of the following specifications. Specifications - 110watts and 85-265V. Which battery you recommend to use for a solar recharge AGM battery for a led lamp grow indoor system?

At what SOC should the battery be ??? At what DOD should the battery be use????

hello. i want to run 2 krk monitors (online its said both are 50watt each) for 6-8 hours off grid. is this possible with deep cycle batteries? how much and which would i need. please help me im stuck in my research

very good explanation, thank you

New to your channel. if I were to take 2 - 12 group-31 DC batteries at 210ah per, will that give me 420?

Can i connect two 12v battery to a 12v inverter

Hi, can someone help me with something? I have a positive and negative wire going to the back of my van. This wire was used to power a wheelchair lift. I gave the lift away and now I have the cut wires. How can I figure out how many amps it can provide? I know hoe to test volts but how do I test those two wires, positive and negative, to know how many watts are coming out? Thank you.

Can a Battery show full charge on a volt meter , and still be missing the Amps - where it wont do anything to crank over an Engine?? Thanks in advance.

Excellent explanation!!! Thanks!!!

If those were 6v batteries shouldn’t you dividing all those #’s by 2?

How about telecom deep cycle batteries? Can it be use for solar ? Tnx!

I think the best take away from this video is right at the beginning where you state that Ah rating depends on the discharge time both of there batteries are rated based on a 20h discharge time. This is so important because some people want to run a 1200W induction cooktop off a battery. At 12 V that will draw 100A!!! The 105Ah rating does not mean you can use the cooktop on full power for an hour. the discharge has to be over 20 hours!!! ... With 85% inverter efficiency the current draw goes up to 120 Amps. The video gets really confusing when you say a 400W inverter at 12V and you have a 6V battery. Later you mention that you need two 6V batteries in series to drive the inverter. I know youtube wants longer videos but please keep them short and sweet.

Thank you very much... you cleared up a few things for me. :)

Hi I have battery deep cycle 100 ah How much is the volume (cca)?

Thank you ! Very informative !

How do i convert cold cranking amps into amp hours???

First , thank you. enjoyed the video. My Question (answering my own) ( correcting me ) is quite simple, if asked. I like to run a Lighting set up max 12 Hr 15W (900 lum)Devide by 12 is under 1A. 105 devide by 1A will give me a 105 hours. on a 210AH battery? If I run twice it will be in half 55 hr ofrun time. the set up all well be 12v no inverter? A deep cell battery is what I should be looking for???

great video. thanks

Great video. Question, my battery is 48v 20ah. My controller is 48v 20ah. Manufacturer upgrade from 20ah b/c none in stock. Will this combo work? Heard it could damage battery. I use PAS too when riding. Hope you can help. /Bklyn👑

Ok one thing i dont understand is why would AH be for the battery down to zero? I dont think thats correct. I thought AH rating already tales into account the safe discharge level. Why wouldnt they, it wouldnt make sense to not apply that already

oh ok thx i get it now i need 6v battery for golf cart to run 400 amp controller i get about 3 hours each so that should go up with 6 batteries should be all day long

Thanks

Excellent Video ...

I'm putting a 30 lb trolling motor on my kayak. Can you recommend a good affordable battery?

I wonder why battery manufacturers just simply means 100amp hr means it can run anything at 100amp for 1 hr.

Good explanation.

90% correct info

Really appreciated..god bless you man!

No one seems to know on KZfaq that you need 120 volts of power 5X the energy of a 12 volt battery therefore the output of that battery powering a 120 volt device dischargers that battery much quicker but no one seems to know that for some strange reason and their amp calculations for 120 volts is all wrong

Very well I informative , thank you

NICE ONE JEFF

Your amazing! This video helped!

Dear Sir, Wish u all the best Sir, Can I connect two deep cycle batteries together but both is deferent AH Battery # 1 is 75 ah Battery # 2 is 200 ah And how many total AH Thank

I'm sure the gentleman in the video knows his stuff... But we have to keep in mind that invertors won't run on anything under ten volts there by making a battery's amp hour rating irrelevant when your battery reaches ten volts the invertor will emit an audible low voltage warning...ignore the warning and you'll soon find yourself without electricity ... Edit literally five seconds after posting my comment the gentleman in the video is talking about discharging a battery to half it's capacity... Let me say it again ...an invertor will not run on anything under 10 volts making it impossible to drain a battery to half capacity using an invertor... I suppose I'm going to have to post a video showing this is true to finally clear this myth up about draining your battery's to half capacity with an invertor...

Thx you for your explaination

BRO I have 12v and 60Ah battery but its backup is less than 2 hours and I charge the battery with UPS and my UPS is 1000va

sup jeff,i was wondering if i could use a 100ah solar battery for my 2000 watt amplifier in my car? the amp does a continuous 2200 watts at 14.4 volts. and i have a 200 amp alternator. Universal UB121000-45978 12v 100AH Deep Cycle AGM Battery.

Optima® 8027-127 BlueTop® Deep Cycle & Starting Marine/RV AGM Battery D27M...... But they don't say what the amp hours are Would anyone have an idea ?

hi great video! I have a 12v marine battery hooked up with a 750w power inverter. I used with a tv and couple fans. It runned 4hours before the inverter started to beep. so do I need to run it for less time before the inverter start to beep?

Someone, please help if you may... I have 2x 12V batteries in parallel. they are lead acid. it sais they have 105 Amps at 20 hrs/each. So in parallel does that mean i have 210 Amp hours at 20 hours? I have 100W light bulb, but if i run it off my 700w inverter, with these batteries, i only get 2.5 hrs of run time, as i dont want to go below 12.1V....i turn it off to save the batteries life. Why am i getting only 2.5 hrs of run time? Please help...thanks.

Do you have recommendations for 2 12 volt battery's that are not expensive for a beginner like me .

Good video Thanks.

good stuff please make more videos