Close Menu
    United Kingdom

    How Many Batteries For a 3000W Inverter?



    🎁 Free diagrams: https://cleversolarpower.com
    📖 My best-selling book: https://cleversolarpower.com/off-grid-solar-power-simplified
    Read the written guide: https://cleversolarpower.com/how-many-batteries-for-3000-watt-inverter/
    Are you wondering how many batteries are needed for a 3000W inverter? In this video, I will provide you with surprising insights, especially since many guides often get this wrong. I’ll explore two examples: one with a lithium battery and another with a lead-acid battery, to demonstrate the ideal setup for your needs.

    Many people use a 3000W inverter with just a 12V 100Ah battery, leading to early battery failure. I’ll show why this happens and what you should do instead.

    In this detailed guide, I’ll cover:

    – The importance of limiting current to 100Amps in an off-grid solar power system, and how it leads to reduced wiring costs, cheaper charge controllers, and higher efficiency.
    – The calculation for a 3000W inverter, demonstrates why a 48V system is more efficient and cost-effective.
    – The concept of C-rate for both lead-acid and lithium (LiFePO4) batteries, and why it’s crucial for battery longevity and performance.

    I’ll also provide a practical example using lithium batteries, showing the calculations for a 48V system and why it’s a superior choice. Plus, I’ll repeat the process for lead-acid batteries, highlighting the differences in size, weight, and efficiency.

    Remember, always fully charge your batteries before connecting them and respect the C-rate to ensure maximum lifespan.

    For those interested in lithium batteries:
    12V batteries: https://cleversolarpower.com/best-lifepo4-battery/
    48V server racks: https://cleversolarpower.com/server-rack-lifepo4-battery/

    Share.
    View 30 Comments

    30 Comments

    3. @Edgunsuk on

      YOU DONT ANSWER THE QUESTION THIS VIDEO ASKS no one building a camper, ((( 90% of the people watching this video!!))) wants to know about 48v batterys OR server racks simple question …. How many 12v AH do you need to run a 3000w inverter ? i know its dependant on what you run and how long for but to be safe …How many 12v AH do you need to run a 3000w inverter ?

    6. @frogsintheforest on

      This is incredible! I can tell you, that I have visited all solar specialists along the Queensland coast, from the NSW border to Rockhampton, where they have no idea how to calculate the capacity of a 12 volt battery to produce 240 V. Using their own words, they had no idea how to calculate it and some said you just need to purchase additional 12V batteries to calculate it. Of course it has taken me until now to learn how to calculate it. Cheers

    8. @andymartinez767 on

      Love reading all the comments. So much talk and so many ideas. Simply put, i have a 5kw inverter with 6.6kw solar panels and a 9.6kw battery. The inverter is hybrid so it charges my battery bank and i use my battery to then run my inverter which gives me my household power. 5kw is enough to run everything in the house except for my 7.5kw ducted air con. I did not bother to increase my inverter to cover the aircon as it will rarely get used and when i do use it then i can tap into the grid power. But the 5kw inverter is 96% efficient so i can run it at around 4.5kw comfortably, which is enough as mentioned to run the house, day and night.

    11. @akadog6319 on

      You can divide the panel watts by 12 volts, but 12 volts will not charge a battery. You will never over 13 volts to charge a 12volt battery. You must also figure in the efficiency of the solar panel because it is less that 100%.

    15. @DrDSays on

      I am powering a 16,000 Watt powerjack inverter with 4, 200Ah LiFePO 200Ah 12V batteries to run my table saws in my wood shop. I would wire them in parrallel to get the 48V and hook them to the 48V inputs on the inverter. then the inverter ouput I have wired to an electric off grid breaker box which powers my 110 v outlets. The inverter should be able to pull the power out of the batteries to start the big draw a large motor requires, correct? I have 8, 200 Watt solar panels 4 connected in parallel to yield approx. 48V then these are connected in series to the other 4 panels. These then combine and give approx 90V and connect to a 100A MPPT charge controller that then goes to recharge the battery bank. My old lead acid AGM batteries stopped powering my big motors last year so I just upgraded to the lithium. Should this work for few years?

    16. @damianbutterworth2434 on

      I ran my house off grid with 2 kilowatts of panels. 80 amp charge controller, 500 amp hour batteries(6 12 volt caravan batteries), 3500 watt sine wave off grid inverter. I never ran a heavy load at night. 24 volt system. This is in the UK. Worked great for at least 9 months of the year. I fitted a separate rings mains so I could switch to grid with a different socket in each room.

    18. @alexl2174 on

      I'm trying to figure out the optimal set up for my Freightliner Cascadia transport truck that runs an electric APU with an inverter inside the bunk to power electronics. The inverter is 2000w but I'm not sure if it could handle a 5000w inverter

      What is the best way to contact you?

    19. @Tom-t1g on

      Cheaper. 😅 Cheaper 😅, 😂 cheaper 🤪, cheaper 😜, cheaper 😂, cheaper 😂, im seriesly thinking about re aligning in parallel dimensions. But it's not cheaper 😂. ✌️

    20. @TehSoupa on

      Something's off about the math on the diagram featured at 5:24 time stamp. It says to get 48v/300 amps to wire it in the sequence shown.
      But each battery is 12v/100Ah so wouldn't it be 48v/1200Ah?
      12v/100Ah x 4 would equal 48v/400Ah, and then multiply by 3 sets wired in series.

    21. @deebee9010 on

      for a year, when Camping, I used a 3000w Inverter with my 120ah Battery to run my Dometic Fridge, an led Lamp & low power TV…😂 just clamped it on & everything ran like a clock..
      …have since changed to a 1500w Inverter…will be buying a bigger Battery soon, maybe 200+ah.
      Think I've damaged my 120ah Battery..?
      Still works beautifully…😂

    23. @FewerOptions-mx7qt on

      There is a reason why they have 12v inverters. Sometimes lead acid battery is better. I have a 12v 700w inverter in my truck plan on replacing it with 2000-3000w. I want to run a 1400w chipping hammer but only for a few minutes and not everyday. My alternator can power it without any drain on battery.

    Leave A Reply