Ah. 12V system is different. (I heard truck and assumed (I know; I
know.) 24V, which is all I've experienced in trucks with two batteries.)
If both batteries are connected together (+ to + and - to -) all the
time, then a trickle charger only needs to be connected to either
battery. Both of their + terminals and both of their - terminals are
equivalent.
The temperature sensor/switch itself should use only a few watts; it
could also be just a bimetal snap-switch that draws no power at all.
When the heater is on, that will consume [perhaps] 1000W, depending on
the heater. (My Subaru Outback block heater draws 400W for example. I
would expect a larger engine to be equipped with a larger heater.)
HTH,
Donald.
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On 2019-03-03 2:04 p.m., eric--- via Shop-talk wrote:
> OK, a few clarifications....
>
> first, the truck is a 12vdc system (Ford f350 diesel) I want to keep
> both batteries charged as it will not get too much use. I would prefer
> one charger but would get two if needed. (BTW, does anyone have any
> suggestions? I burn through these pretty quickly it seems. The best
> one I have they don't make anymore.)
>
> As for the thermostat, I never know when I need to use the truck, so the
> 'few hours before' doesn't work. I did buy one of the "on below 35, off
> at 45" units mentioned here. How much electric can that use? (BTW, I'm
> also 100% solar right now.)
>
> Thanks again!
>
>
> Sent from my Commodore 64 on a 2400 Baud Modem.
> Tech Viper
> "Be as beneficent as the sun or the sea, but if your rights as a
> rational being are trenched on, die on the first inch of your
> territory." Ralph Waldo Emerson
> -Who is John Galt?
>
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