2 replies to this topic

[Jsoboti]

Haven't been able to track down an answer to this, but I'm sure it's come up for some folks...

 

Assuming cold temps, and the self-heater inside the battery is required before the battery starts charging, some of the current that passes through the shunt (counted as % charge added) would actually be used for battery heating, not battery charging. Is this the case? 

 

If so, what's the most accurate way to know your self-heating LiFePO4 battery's state of charge? 

 

Several of the cheaper ones don't seem to have a smart enough internal BMS to provide this info. Honestly this one thing may lead me to purchase more expensive Renogy batteries that have a blue tooth connection right at the battery, giving SOC, self heater status, etc. 

 

Thanks!

[Vic Harder]

Good question.  I don't have self-heating BBorn batteries, but if I did, I would simply use the "synchronize" feature on the BMV to set it back to 100% when I am sure they are fully charged.  Maybe after (or before) every trip?

[Jsoboti]

Good question.  I don't have self-heating BBorn batteries, but if I did, I would simply use the "synchronize" feature on the BMV to set it back to 100% when I am sure they are fully charged.  Maybe after (or before) every trip?

 

Good pint Vic, that would work if I were confident that I could do my whole trip on a single charge for sure.  

 

Unfortunately I'm pretty OCD and I do find myself constantly checking my SOC, even when I know I'll be good. Boys and their toys eh?