1000W Inverter: How Many Batteries You Really Need

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In today's video, I'm diving into a common question in the off-grid solar world: How many batteries do you actually need for a 1000W inverter? You might be surprised to know that many guides out there get this wrong. I'm here to set the record straight with detailed calculations and comparisons.
We'll start by revisiting the concept of limiting current to 100A by adjusting the battery voltage, as discussed in my previous video about 3000W inverters. Then, we'll specifically analyze what's needed for a 1000W inverter.
Lead-Acid vs Lithium Batteries:
I'll compare lead-acid batteries, known for their .2C C-rate, with the more robust 1C C-rate of lithium batteries. You'll see how the amount of batteries required varies greatly between these two types, and why getting this right is crucial for the efficiency and longevity of your system.
Wire and Fuse Sizing:
An often overlooked but crucial aspect! I'll guide you through selecting the appropriate wire and fuse sizes for your system, explaining why these choices matter and how they contribute to overall safety and efficiency.
Why Size Matters:
Under or over-sizing your battery can lead to inefficiency and even damage. I'll break down why it's important to match your battery size accurately to your inverter's requirements.
Free Resources:
Also, don’t miss out on my free diagrams to help simplify your DIY solar power projects. Check the first link in the description to sign up and receive these valuable resources directly in your inbox.
00:00 Introduction
00:19 Calculating current
00:59 Lead-acid
02:07 Lithium
02:47 Why do we size like this?
03:39 Wire and fuse size

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29 июн 2024

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Комментарии : 86

@cleversolarpower Месяц назад

🎁 Free diagrams: cleversolarpower.com/free-diagrams 📖 My best-selling book on Amazon: cleversolarpower.com/off-grid-solar-power-simplified 💵Use coupon code: clever6 to get 6% discount for Litime batteries: cleversolarpower.com/litime (cheaper than amazon)

@3sheds 5 месяцев назад

Thank you for simplifying and sharing your knowledge. As a direct result of your previous video, I have abandoned my Lead Acid, and moved to a Lithium to power my 1000w Inverter. It works perfectly. All I need now is for spring sunshine to come 🤣

@budmartin3344 5 месяцев назад

To get 1000W from the AC output of the inverter, the input power to the inverter will be higher than 1000W due to the inverter efficiency, 80% is typical, so the current draw from the battery will be 83A/0.8 = 103A.

@cleversolarpower Месяц назад

Correct, when sizing wires and cables we use a 1.25 factor to account for this. I didn't include it in this video because it would make it more complicated.

@davef.2329 5 месяцев назад

Well done. Thanks.

@AenesidemusOZ 4 месяца назад

Great content. 👍

@2011italianoboy 3 месяца назад

Ok, I'm new to inverter, solar-powered, and batteries. Your video explained it well. I WAS going to get 3k watt inverter with just one LiFePO4, rated at 100a. I know now that I would need at least 3 100amp batteries to work with a 3k w inveter.

@cleversolarpower 3 месяца назад

Yes, I also made a video about how many batteries for a 3,000W inverter. You can check it out.

@Electronzap 5 месяцев назад

Good info.

@cleversolarpower 5 месяцев назад

Glad it was helpful!

@loumusa9124 7 часов назад

Thanks for the video. As a result I want to replace both my deep cycle 100amp lead acid batteries with 2 Lithium 100ah batteries. My inverter is a Sensata Technologies CSW1012 1000W Inverter. Will this set up work for my situation?

@BenjieEng 5 месяцев назад

Thanks for this video... I've got the answer to my question 😂

@jerryndembeka7682 5 месяцев назад

Please do another calculation video with 2000W inverter with 24V batteries. Your videos are very helpfully. Thank

@cleversolarpower 5 месяцев назад

Thanks, I feel like repeating myself when I do that video. It's the same principle over again. 2000W on 24 will draw 83A. Lead acid needs to be 24v 400ah, and lithium 24v 100ah.

@evanemerson89 22 дня назад

Thankyou

@user-zs8vz3tb6n 5 месяцев назад

Your videos are so succinct and serve as refresher for me as an experienced Solar PV Professional. However, this particular video needs reveal. For example, if an inverter is rated 12V/1000W (assuming 100% efficiency), it means it can supply max. 83A. Then a typical Lithium battery rated 12V/100AH at 1 C rate will draw maximum of 100A. The system will definitely overheat because what is required for the battery charging 100A is higher than what the inverter can supply which is 83A at 100% efficiency. Thanks.

@cleversolarpower 5 месяцев назад

83A x 1.11 (efficiency of inverter) = 92A. Yes, the BMS will get warm, but that's what it's rated for.

@jab376 4 месяца назад

@@cleversolarpower what happens if we use 4 x LifePO4 batteries with 1000 watts inverter? Will also overheat like Lead acid battery?

@junior4246 2 месяца назад

i have a 1000w Renogy inverter with a 280ah fogstar drift lithium battery is this any good ?

@JD-rp1fx Месяц назад

Is that the required battery sizes if you run the inverter at max power? If your load is only say 200A (a fridge and some lights) you won't place a big draw on the battery, mostly inverter on idle.

@realflow100 2 месяца назад

I have a super budget cheap universal brand 100 amp hour capacity 12 volt sealed agm lead acid battery paired with a 1000 watt pure sinewave inverter and it works beautifully. No problems. Never took the battery below 80% depth of discharge. and it handles loads like window air conditioners. vacuum cleaners. computers. and more. with no problems. powering it for a few hours. Doesn't get hot. Voltage drop is not a problem. I used thick 1/0 awg gauge cable so even under the load of a full size window air conditioner it powers it like it's not even there. It is about 3 years old and still works like new. I respect the batteries maximum capabilities by checking the manufacturers specifications on it. and it is fully capable of handling anything I throw at it when properly set up and used correctly. I use it as a backup emergency power generator setup. where it is kept charged and maintained when not in use. and fully charged and ready for use if there is a power outage or other emergency where we need significant portable power. it is very cheap and budget but works great.

@victorgallardo9763 4 месяца назад

Thank you very much for the video, I am learning a lot, but it is not clear to me if a 200Ah (lithium) battery would be better than a 100Ah? Would it be more efficient?

@cleversolarpower 3 месяца назад

Having a larger battery will put less stress on the battery. One battery will draw 85A while a second battery in parallel will only draw 43A per battery. So you put less stress on the battery, leading to a longer lifespan.

@tedjelsema782 2 месяца назад

does battery amps effect pv controllers?

@jackfromthe60s 3 месяца назад

I like your videos. I just received your free diadgrams and am working my way through them. On page 5 of the free diagrams you say a lithium battery can provide a current of 0.5C. But at 2:10 in this video you say a lithium battery can provide 1C. Can you please clarify?

@cleversolarpower 3 месяца назад

Some lithium batteries are rated for 0.5C, but nowadays, this is 1C. I will change the document. Thanks for notifying.

@TUVIX3 4 месяца назад

I like your video but I can't figure out how many batterys I need. I want to power a computer pulling 1500w at the wall at night. If I have a solar pannel charging the batterys during the day? Is it even posible to power for that amount of time?

@cleversolarpower 4 месяца назад

Check out my video about sizing an off grid solar system. It will tell you how.

@victorjoseph8948 3 месяца назад

IF i only charge my lipo4 12v 100ah battery with solar panels i do not need the invertor right? for i just want to only charge the battery for augmenting my Bluetti EB3A 268Ahcapacity and have 1080 usable Wh with my EB3A battery. is this correct? or am i mistaking? 1080+268= approx 1300Wh. instead of just the 268 watts. since the EB3A has a charge controller mppt integrated.

@cleversolarpower 3 месяца назад

If you don't need AC, then you don't need an inverter.

@brandonraybern9975 5 месяцев назад

400ah lifepo4 with 2000W intverter...should I experience any issues being that much more on my battery bank?

@cleversolarpower 5 месяцев назад

2000W/12V=166A*1.25=208A If your bms can handle 200A, then it's ok.

@user-qc6yq1jh4j Месяц назад

how to tell what the battery is agm or lead acid or deep cycle or lifium ?

@cleversolarpower Месяц назад

The battery will tell you 😉

@user-qc6yq1jh4j Месяц назад

that if the label is still there

@BenjieEng 5 месяцев назад

I have been using 12v 150ah lead acid battery on my 1000w inverter, and the results after 6 months, now, the battery drained in 30 minutes in 200w load.

@cleversolarpower 5 месяцев назад

0.5h*200W=100Wh. Your battery can deliver 12V*150Ah*0.5=900Wh. So if the battery only delivers 100Wh while it should be 900Wh, then your battery is dead.

@bjarnenilsson80 8 дней назад

Imigh be stupid but is thst fuse before or after the inverter? That is on the av or dc side

@cleversolarpower 8 дней назад

There are no stupid questions, only bad teachers 😂. It's before the inverter on the DC side. Breakers are used on the AC side.

@mmawar4825 Месяц назад

I need to install 1000 wat sostem 1 kw natery storage lothium please jelpe how to prosode woth dhe stiif i meed to by

@cleversolarpower Месяц назад

I just made a video about it.

@user-pj3ft7bl9i 4 месяца назад

Cant i connet 2 inverter 1 500w and 1000watt up batery 12vlt 100ah

@cleversolarpower 4 месяца назад

if the inverters cannot communicate with each other, don't wire the outputs together.

@nakorau 5 месяцев назад

a video on DCDC battey chargers. please.

@cleversolarpower 5 месяцев назад

Thanks for the suggestion 🙏

@nakorau 5 месяцев назад

@@cleversolarpower i assume you could talk about alternator output amps, lithium and agm , charging rates and so forth. smart altrernators is a thing now with modern cars.

@ashiepfrancis8503 4 месяца назад

Please can I use 120ah battery and 2000w invater to power up 180w tv

@cleversolarpower 4 месяца назад

Yes, but make sure you follow the calculations in the video.

@ashiepfrancis8503 4 месяца назад

Thank you

@ashiepfrancis8503 4 месяца назад

How many watt solar panels are recommended for 2pc of 120ah battery

@user-rc1yo5lu9z 5 месяцев назад

i have 2 24 V DC lead acid batteries is that enough for my 3000W inverter ?

@cleversolarpower 5 месяцев назад

Most likely not. If the 24v batteries are 100ah each, then you should draw maximum 40amps. 40Ax24V=960W.

@user-rc1yo5lu9z 5 месяцев назад

so maybe go down to a 2500W inverter?@@cleversolarpower

@user-rc1yo5lu9z 5 месяцев назад

watching your video and doing some math (hopefully correctly lol) a 2000W inverter with my 2 24V Battery 100AH should be fine (1920 W) . Is this correct ?

@robertweekley5926 5 месяцев назад

A "100 Ah" Lead Acid Flooded Deep Cycle Battery (Trojan SCS Series) is "Rated" at 20 Hours, meaning a "5 Amp Load" (20 Hours x 5A = 100 Ah)

@robertweekley5926 5 месяцев назад

To get a Durable Setup, if you need to pull 100 Amps just divide 100 by 5 to get your battery count! (100/5=20) So that means 20 in Parallel *For a 12V Inverter*, or 4 in Series x 5 in Parallel if you use a 48V inverter. So 2 in Series x 10 in Parallel, for a 24V Inverter!

@figuretech547 2 месяца назад

What bothers me here is that in all the calculations how can one tells factors like How long will the Inverter supply the load capacity How long the battery will take before it is full and of course how long before the battery charge controller or inverter shutdown when i reach my targeted depth of discharge. Please help

@cleversolarpower Месяц назад

That depends on your load analysis. Check my video about it.

@figuretech547 Месяц назад

@@cleversolarpower please can you do a video about it Sir. I'm a big fan. Have almost watched all your videos

@markissboi3583 3 месяца назад

Average person buys a good inverter to run off your car plugs into ciggie lighter socket & wonders why car catch fire :) draw on small wires bad hot like using a welder with an extension cord wound up on a spool Melts ive seen this happen in the 80s at work if we didnt make mistakes we wouldnt learn anything ok

@cleversolarpower 3 месяца назад

Better learn through a RU-vid video than a burning car i guess.

@ferencszabo3504 5 месяцев назад

Cmon, you gonna deep discharge the batteries? 😅😅 The lead batteries are the worst, you can only discharge it for 25%, the rest of it 75% must remain in the battery! They are very inefficient! The Lithium has its own quirks of course!

@cleversolarpower 5 месяцев назад

Lead acid should be discharged to 50%. Lead acid still has its applications, but lithium is cheaper in the long run.

@MegaCyrik 5 месяцев назад

Im guessing you know better.. so... Why would you say lead acid is 0,2c and lithium 1c? My old lead is 0,33c but higher is quite common. I often run into 0,5c while browsing. Also lithium goes all the way up to 100c and probably higher. Some are lower than 1c thou. Most of my own are 3-5c. I'm just curious why you say 0,2 & 1c.. why not just teach people to examine their bats or examine what to buy.

@cleversolarpower 5 месяцев назад

Checkout the data-sheet of the battery. Most lead acids are tested at C20 which is 0.2C. that is then the capacity. You can discharge quicker at a higher C rate, but then the capacity is reduced. Look at trojan battery data-sheet which shows it very clearly. Lifepo4 batteries are discharged at 1c and then the capacity is based on that discharge rate. Check my video about C rate.

@rocktech7144 5 месяцев назад

Take your four batteries and turn them into 2p2s for 24 volts. Use a 24volt inverter and smaller wire is needed.

@cleversolarpower 5 месяцев назад

I have discussed that in my video about a 3000W inverter. If you have lead acid, you still need 4 in parallel to respect the C-rate. If you want a 24V system, then you need 8 batteries in a 4S2P configuration.

@rocktech7144 5 месяцев назад

@@cleversolarpower I thought you were talking about 1000w. I just use 8 230A lithium cells and they run my shop and cabin with 3000w.

@mynameisprivate158 5 месяцев назад

Yea but why can't I have 2 12v batteries connected to a 2000w inverter so the pull is 83w from each battery

@cleversolarpower 5 месяцев назад

@@rocktech7144 3000W/24=125A (okay-ish) 230Ah*1C=230A -> under 125A, so C-rate is ok.

@cleversolarpower 5 месяцев назад

@@mynameisprivate158 Your current will be 166A, which in my opinion is too much. It will work, but not as good as a 24V or even 48V system. I have a video about that upcoming.

@cabracove 5 месяцев назад

Ok, first off, a 1000 watts is pretty useless. Get an inverter that will at least run a coffee maker.

@cleversolarpower 5 месяцев назад

That's so American of you to say 😄 vans use less than 1000 watts.

@cabracove 5 месяцев назад

@@cleversolarpower 2000 watt inverter and 460AH of batteries in my van. My coffee maker pulls 1200 watts.

@adriaankoffiekar6442 5 месяцев назад

My Coffee machine pulls 2500 watt and the inverter is 3kVa 48V - 16 lfp04 280ah Est. On time 25% VICTRON Multplus 2 GX 50mm2 automotive double shielded cables 2mtr x 2 I can hardly wait for the sodium cells to become reasonably affordable, especially considering their cold qualities.

@davef.2329 5 месяцев назад

No trying to start any arguments with anyone, just convey some useful, practical info: Mr. Coffee Mini (5 cup model) draws 635 W when on the brew cycle, then becomes intermittent, as needed with the warming plate on. That 1/2-size machine, with a 1000 W CSWEI PSW inverter, 10 Ah MPPT charge controller, 100 Ah LiFePo4 (100 Ah BMS) and 150 W of solar panels has worked successfully without any other a/c input for the past year. We make a pot in the morning, another in the evening, and sometimes another in the mid-day. It's doable.

@cabracove 5 месяцев назад

@@davef.2329 Hey whatever works. I'm already running the fridge, I like to turn the diesel heater on in the morning, and maybe nuke a pastry with some butter to have with my coffee.. 1000 just won't cut it. Some of that stuff is 12V, but still....