Quote:
Originally Posted by Ecky
I believe cold increases the battery's resistance anyway?
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Yes.
If they are anything like the performance curves for A123 style LiFePO4 cells .. the attached are graphs showing the effect of SoC and Temperature on a cell's effective ohms.
Even if (as a different brand) the curve is a little different than A123's , I would still suspect similar overall shape / trend.
Quote:
Originally Posted by Ecky
None. The smallest 100A relay I could find had an active power draw of ~12w, and most of the nicer ones are ~20-30w. To me that's pretty unacceptable.
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You could move away from mechanical relays , to solid state stuff instead.
Although the premade solid state such disconnects are a bit expensive .. they do show how significant of a drop solid state options give for the switch's power consumption rates.
Random example of such pre-made solid state (Mosfet) low voltage disconnect.
Amazon
Victron Spec pdf
$40 with S&H
Load = 65A continuous , 250A for 30sec
Self Consumption = 1.5mA on , 0.6mA off