A-ha... that's what I'd suspected! Ideally, it'd be great if I could get close to fully recharging my overnight power consumption (I'm guessing somewhere between 20 - 40 amp-hours).
It sounds like the 120 W kits would be the minimum for what I'm after, and 180 or 240 W would be better.
I suppose I should probably also look into keeping the battery insulated in the car, rather than exposed to the cold.
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