On Wed, Feb 25, 2004 at 08:12:13PM -0600, Adi Linden wrote:
> > Of course all of this could be avoided by buying a solar panel specifically
> > designed to charge 12V batteries.
>
> Not for charging the battery overnight :)

Back to the same problem but not undoable:

1) Have the solar panels charge a 18V or 24V bank of batteries. For example you
   could charge 2 12V batteries in parallel.
2) Have the battery bank charge the target. For 24V take the 2 12V batteries
   and switch them to a serial config. Presuming that you have a switcher
   for ou charging regulator, they can then charge the target.

Note that if it's offline night charging, then you can even do this technique
without the panel, using the motorhome alternator to change the battery bank
instead of the solar panel. Or offer both technologies.

But using a second battery at the head end will provide a lot for headroom
than  the boost-buck technique you were thinking about earlier.

BAJ

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