climate controlled battery box

[Mobilesport]

Just a idea i had when i noticed i had to do xtra charging today because the tempature got down to negitive -3

 

[SternWake]

If your batteries are 0f and IF they were fully charged, they only have ~ 60% the capacity they do if they were 77f

At 0f battery temperature, absorption voltage should be raised significantly, from 14.8v to 16.2v

Good thing that meanwell rsp-500-15 will go upto 19v eh.

Do not discharge too far either, the batteries could freeze and crack the casing.

 

[Mobilesport]

If your batteries are 0f and IF they were fully charged, they only have ~ 60% the capacity they do if they were 77f

At 0f battery temperature, absorption voltage should be raised significantly, from 14.8v to 16.2v

Good thing that meanwell rsp-500-15 will go upto 19v eh.

Do not discharge too far either, the batteries could freeze and crack the casing.

Your numbers seem right on the money.
60% sounds about how it played out

 

[SternWake]

According to BCI, a specific gravity of 1.15 has a freezing temperature of –15°C (5°F).

According to trojan, a specific gravity of 1.15 is around 43% charged

They sell battery warmers. but these of course consume electricity

https://www.amazon.com/Kats-22200-W...id=1482040149&sr=1-2&keywords=battery+blanket

High amp recharging will heat batteries pretty well, Some insulation could be your friend in your current temperatures

 

[jimindenver]

Temperature compensation is big in extreme temperatures, mine had my controller pushing 15.2v at 8 degrees a few days ago.