I thought so too, but going by the battery’s Bluetooth, it shows 100% with 280 ah and seems to settle around 13.6. Then the BMS switches to standby. The Trimetric is calculating via what it sees the shunt do over time regarding fullness.
@theVAP his voltage indicator showed between 14.1 to 13.9. I've got two each, 4 cell LiFePo batteries that the bms tops at 14.2 and shuts off at 12.2 or so. Seems a touch more than flooded lead acid 6 cell. Their floating voltage is 13.2 and lithium around 14 to 12.9 on the lower end of useful charge. Fla is dead at 10 volts.
I did a test today and drew 100amps for over an hour. Voltage stayed at 12.6 under load as it dropped to about 58% per the BMS. Then I used Boost mode on my charger and the BMS stopped accepting charge when it reached 100% at 14.4v. Slowly with no charger on it, its settled to 13.6v and 100% with 280ah. You’re right on the 10v -spec says that’s the low cutoff. 14.6 is the high cutoff.
I think those portable supplies are perfect for small loads like charging phones and laptops. Running a microwave would be a bit much. With enough lithium people are even running their air conditioners!
@theVAP but for an 800 watt microwave pulling about 1000 watts, 148 amps at 12 volts is 1700 watts! That's around 60% efficiency ballpark. Ouch!! I'm hoping it's at least a pure sinewave.
Hi Tim! Thanks for the battery update. I like hearing about the life cycle of components you installed in your Airstream.
Sure thing! Thanks for watching.
Looking at the graphic charts you showed, 12.8 volts is the near dead voltage. 14.2 is a full charge.
I thought so too, but going by the battery’s Bluetooth, it shows 100% with 280 ah and seems to settle around 13.6. Then the BMS switches to standby. The Trimetric is calculating via what it sees the shunt do over time regarding fullness.
@theVAP his voltage indicator showed between 14.1 to 13.9. I've got two each, 4 cell LiFePo batteries that the bms tops at 14.2 and shuts off at 12.2 or so. Seems a touch more than flooded lead acid 6 cell. Their floating voltage is 13.2 and lithium around 14 to 12.9 on the lower end of useful charge. Fla is dead at 10 volts.
I did a test today and drew 100amps for over an hour. Voltage stayed at 12.6 under load as it dropped to about 58% per the BMS. Then I used Boost mode on my charger and the BMS stopped accepting charge when it reached 100% at 14.4v. Slowly with no charger on it, its settled to 13.6v and 100% with 280ah. You’re right on the 10v -spec says that’s the low cutoff. 14.6 is the high cutoff.
Wouldn't it be easier just to use one of those portable power supplies? Just wondering
I think those portable supplies are perfect for small loads like charging phones and laptops. Running a microwave would be a bit much. With enough lithium people are even running their air conditioners!
That's still quite a bit of sag. Now 2 of them would cut the mustard for running the microwave and a windows unit air conditioner together
I agree. Two would be awesome.
@theVAP but for an 800 watt microwave pulling about 1000 watts, 148 amps at 12 volts is 1700 watts! That's around 60% efficiency ballpark. Ouch!! I'm hoping it's at least a pure sinewave.
Interesting point. I’d need to check the current draw on the AC side to be sure. It’s an older GoPower pure sine wave.
Lithium Iron (not Ion) Phosphate
True, much les likely to go boom.