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diy solar

How to calculate, how long the battery will last

tcj2001

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Jul 11, 2022
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Two 48V EG4-LL batteries will give 5.120 x 2 = 10.24kWh and 200 Ah, if I have a inverter like EG4 6K Off-Grid Split Phase Inverter | 6000EX-48HVconnected to the battery and if I draw 2.4kWh (10A) from the Inverter @ 240V, will the battery last for 200A of battery/10A draw = 20 hrs. or 10.24kWh / 2.4kWh = 4.26 hrs. May be I am totally wrong, please guide me.
 
Watts = power
You're close with your 4.26 but you forget to figure in inverter efficiency and the idle consumption of around 115w continuous, you'll use over 2kw daily just running the inverter.
 
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Not to mention you'll likely not want to use 100% of the batteries on a regular basis. So using only 80% of the 10.24kWh batteries, the inverter idle consumption drawing about 2.76kWh/day, and your efficiency losses... You're looking at about 5kWh or less of actual usable batter capacity left.
Disheartening isn't it! :confused:
 
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