wrote:
I assume you are talking about charging your glider battery from a
storage battery, which you charge with a solar panel during the day.

Yes. Basically, I want a setup that looks like:

a) Solar panel
b) Charge controller
c) Storage battery
d) charge controller
e) Glider battery

I currently have (a) & (b) rated at 12v. So in my case, I need a
solution for (d) that does 11v+ - 12v SLA charge.

For $100 I can get a fancy model charger with lots of extra options,
but it will do the job.

For a bit less than $100 I can get the car adapter/voltage booster and
a regular charge controller. Two boxes, but maybe a little more rugged
than the model charger. Since I have 2 batteries in the glider that I
now alternate using/charging, this may be the best solution, as at a
later time, I can get a 2nd controller to keep both batteries topped at
all times. Since I use the batteries one at a time, I prefer to have
an independent charger on each instead of just charging them in
parallel.

If I were starting from scratch, I think I'd set up a 24v storage
system using 2 car batteries or large SLAs. Then use the 24v to drive
a 12v charge controller for the glider battery.

-Tom