En el artículo o.uk,
Dave Liquorice escribió:

Possibly not as the current is low (1.5 W @ 12 V = 125 mA max) so
volt drop is also low (0.125 V per ohm)

True, but last time I looked 50m of cable isn't free

Not easy to retro fit around the battery tray on the genset, there
isn't much clearance from battery to frame/alternator etc.

store it on the floor next to the gen and run longer cables?

Also with
the garage at -10 C for a week nad near freezing for a month or so
either side I supect everything will get pretty cool insulated or
not.

Using a trickle charger on the battery will warm it up slightly. If you
used a charger on a timer, warming up the battery stored in a poly case
may be enough to prevent it freezing.

How much warmer would the watt or two from a float charger keep
the battery in such a box?

It wouldn't, but the battery itself will warm slightly during charging,
so if you could insulate it that may be all you need to prevent it
freezing.

Just some ideas.

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