Sorry to confuse.
There's a Strobl OS2H charge controller on the glider installations:
"Optional PV Charge Controller" Abbreviated like the fuses and connectors are in the text-only drawing.
Jim

On Wednesday, October 23, 2013 10:55:06 PM UTC-7, Alan wrote:
In article JS writes:

How about this, diagram below.

Each battery should have its own fuse.

Switches are drawn as -o\-

Vertical line is the Master bus.

Optional PV charge controller charges the active battery, whether avionics are on or off.

I'd suggest locking switches like Alcoswitch MTL106D available from Mouser for $12.60.

Jim



Bat 1 -----o\-----|

Bat 2 -----o\-----|

Bat 3 -----o\-----|

|-----o\----- Avionics

PV Charger -------|



I would seriously recommend against this.



If you only turn on the avionic load switch, with no batteries in

the circuit, the avionics will see the full open circuit output of

the solar panel.



Many "12 volt" panels deliver in the vicinity of 21.6 volts open

circuit -- even if not that high, they can easily be enough to damage

electronics.



Charge should be applied through a charge controller, so the panel

doesn't overcharge and cook the battery, and should be applied in

such a way that it cannot be applied directly to the load alone.



Alan