Galen Hekhuis wrote:

Except a car battery won't work.

Right...

What will probably be needed is a several
batteries in parallel to provide that much current overnight.

yes.

This will be essential, and matching the regulator to the type of
batteries you have (so as not to overcharge or something harmful to
the life of the batteries) is critical, if battery life is to be
maximized.

No, these days solar charge controllers are practically off-the-shelf items,
with at least a jumper to select flooded or sealed batteries, and often a
little adjustment for optimum maximum charge.

and we're in the 2 kilo-dollar
neighborhood.

Probably a lot more.

No, that sounds about right.
--
derek