Quote:
Originally Posted by oil pan 4
Your minutes of reserve capacity is how long the battery can produce 25 amps with out falling below 10.5v at 80F. The problem with 10.5v is that's really freaking dead and is probably damaging the battery.
You are likely no where near 80F when using the battery.
The smallest block heaters are typically 600 watt so the battery will run the block heater for maybe around an hour.
Then it will take up to 10 hours to fully charge the battery.
Chances are the car alternator doesn't produce enough volts to push finishing amps through the battery.
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I'm not the most technically minded, so could you break that down into a simple yes or no? I work 10 hours a day, and at least 6-7 hours of that is on the road - if I just set it for days where it was gonna be below freezing, for half an hour, would this be feasible?
Edit: I should probably mention that it is in a semi-heated garage, so it's not like I'll be doing it at -30, more like 35-40.