ExpertPower 12V 200Ah (runtime analysis) Lithium LiFePO4 battery real world test

Product being tested:

ExpertPower 12V 200Ah Lithium LiFePO4 Deep Cycle Rechargeable Battery Description: 2500-7000 Life Cycles & 10-Year Lifetime | Built-in BMS


11:27 AM 2/28/2021
Start ~370 watt load

3:19 PM 2/28/2021

3:41 PM 2/28/2021

4:19 PM 2/28/2021
~1.845V (voltage below inverter low voltage disconnect, apparently due to BMS disconnecting load at “empty”)

Results: 4 hours 52 minutes runtime at ~370 watt inverter output

= ~1801Wh output (not accounting for inverter inefficiency)

Using inexpensive Bestek 500W 12V to 110V AC inverter (actually around 116V AC) to power constant 370 watt resistive load.

Other misc. notes/calculations.

2560Wh rated
1850Wh used…
~2035W actually used?
79% at 90% efficiency
If inverter efficiency ~90%

Or ~2127.5W at 85% efficiency
83% of rated capacity…

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