Maximum inverter for battery

Jun 25, 2023
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Citreon Relay
Hey everyone I am looking to find out what the maximum inverter I can use on a lifepo4 battery.

The battery has 200ah - 2560 wh and is a 12v lifepo4 battery, does this mean it can handle 2000w max? and will run for one hour before depleted?

I'm not sure how to find out the max wattage inverter the battery can handle. 200a maximum draw on battery. Can I multiply that by 12 to get 2400w and that's my max? so I could purchase a 2000w inverter.

cheers,
Ross
 
Whilst you could go up to a 2Kw inverter, it's usefulness will be determined by the capacity of your LiFePO4 battery. A 2Kw draw is going to give any battery a bit of a hard time unless for very short bursts.
 
The limitation is usually the maximum discharge current that the BMS can handle.

With a 2000W inverter, you’ll be needing a BMS that can handle 200A, irrespective of the capacity (Ah/Wh) of the battery

Ian
 
Thanks everyone. The battery can deliver 200a output so is the math 200x12 = maximum wattage delivery.
 
Thanks everyone. The battery can deliver 200a output so is the math 200x12 = maximum wattage delivery.

Effectively. If you have a 2000W inverter then it is reasonable to assume that the current required at full chat is 2000/10 = 200A.

Are you saying that your battery can deliver 200A because it is a 200Ah battery or do you know that it can deliver 200A without the BMS protection kicking in?

If the former then your battery may not be able to deliver 200A but if it is the latter then, in theory, you could supply a 2kW (provided that your inverter could cope).

Ian

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You’re actually better to use 13v as nominal voltage calculation for lithium, so a little more grunt available. ✔️
 
Effectively. If you have a 2000W inverter then it is reasonable to assume that the current required at full chat is 2000/10 = 200A.

Are you saying that your battery can deliver 200A because it is a 200Ah battery or do you know that it can deliver 200A without the BMS protection kicking in?

If the former then your battery may not be able to deliver 200A but if it is the latter then, in theory, you could supply a 2kW (provided that your inverter could cope).

Ian

Agree that most commercial lithium batteries don’t necessarily have BMS’s supporting 1C discharge rates.
 
We have a 304Ah lithium and a 3000w inverter - I've never bothered with 'sums' but the practical experience is we can run a microwave and electric kettle at the same time - it would have been cheaper to do the sums though, rather than buying an underpowered inverter originally...
 
Buy a 3 KW inverter and limit it's use to 2 KW by use of a fuse in the 240v 3 pin plug,it will be running at 2/3 it's rated output so not working hard and if you add another battery later you will be able to use 3kw

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