Inverter

 
 
 
 
 
 
eirebus
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Inverter

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Posted: 19.06.2024  ·  #1
What size inverter Would I need to power a 2kw device and would a 100ah lithium battery be able to power it , can the inverter be fitted directly to the battery, with proper wire and fuse obviously


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Re: Inverter

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Posted: 19.06.2024  ·  #2
Quote by eirebus

What size inverter Would I need to power a 2kw device and would a 100ah lithium battery be able to power it , can the inverter be fitted directly to the battery, with proper wire and fuse obviously


I'm no expert but, watts equals to volts x amps....so 2000watts รท 12v = 166.6 amps
...so your battery would need to be able to provide approx that amount of amps before the Battery management system shuts down...the cable and fuses would need to be able to carry that many amps minimum also or they'll melt and could go on fire😱.....my inverter is a pure sign wave 2000w and it powers my coffee machine no probs which is 1300w and a mini oven that's 1500w..the battery is 150ah lithium...the oven would zap the battery fairly lively though as it pulls savage power constantly so i rarely use that when off grid.I have an air fryer that's 1200w I think and this isn't as hard on the battery as when it hits the temperature it doesn't draw much power,as the temp drops it then kicks back in again drawing power again....I'd imagine you'd need a bigger battery than 100ah though or else use smaller wattage appliances up to 1000watts or thereabouts.

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insider
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Re: Inverter

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Posted: 19.06.2024  ·  #3
Most Lithiums of 100AHr I've seen have the BMS limiting them to 100Amps. You'd need to jump to 150AHr or larger typically to have the current draw you require. Ironically I have my Renogy 2KW invertor bought but not fitting until I go to Lithium. In the meantime I have a 300W.
Answer to 2nd question is yes - it can/should be fitted directly to battery, fused and with the shortest cable run you can. I imagine you're need 25mm2 even on a short run and the termination of something like that is very important. Easy to go welding with those currents!!

I'm looking at Lithium here in Ireland and it's so expensive compared to buying in the UK...I do think there's a gap in the market


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Re: Inverter

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Posted: 19.06.2024  ·  #4
Quote by insider

Most Lithiums of 100AHr I've seen have the BMS limiting them to 100Amps. You'd need to jump to 150AHr or larger typically to have the current draw you require. Ironically I have my Renogy 2KW invertor bought but not fitting until I go to Lithium. In the meantime I have a 300W.
Answer to 2nd question is yes - it can/should be fitted directly to battery, fused and with the shortest cable run you can. I imagine you're need 25mm2 even on a short run and the termination of something like that is very important. Easy to go welding with those currents!!

I'm looking at Lithium here in Ireland and it's so expensive compared to buying in the UK...I do think there's a gap in the market


Build your own, it's much cheaper.
I got four cells, Not exactly these plus a decent BMS.
Electric kettle, air fryer, microwave, hairdryer, etc no problem off my 1500watt pure sine inverter.

See my posts from #96 onwards Here


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Re: Inverter

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Posted: 26.06.2024  ·  #5
As a rule of thumb, 100Ah LiFePO4 battery needed per kW of inverter power. So, 2000watt inverter needs 200Ah battery.

I'm going down the same road myself. I have sourced some good lithium iron batteries on eBay. They are made by a company called Kepworth which has a good reputation and imported directly from Germany. They cost around 350 Euro for a hundred amp hour and, I think, around 550 euro for the 300 Ah one I am going to get. EBay and Paypal will guarantee security of payment in the event of a problem.

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