Master Switch

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 -------|

Sorry, the line looked vertical before shipping.
Jim

On Wednesday, October 23, 2013 2:34:15 PM UTC-4, JS wrote:
Sorry, the line looked vertical before shipping.

Jim

I would put a fuse downstream of the PV charger. If it develops a short, your whole system dies.

Right you are, Flub.
As well as the individual loads.
Jim

On Wednesday, October 23, 2013 5:10:37 PM UTC-7, son_of_flubber wrote:

I would put a fuse downstream of the PV charger. If it develops a short, your whole system dies.

Those switches look like what I used as my new master switch, except mine is
DPDT. I could use one to power two separate busses from two separate
batteries.


"JS" wrote in message
...
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 -------|

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

If anyone is interested my panel wiring can be found he

www.boffins.co.uk/downloads/j1mwiring.pdf

Jim

Very nice, Jim. I'm going to save a copy of that!


"Jim White" wrote in message
...
If anyone is interested my panel wiring can be found he

www.boffins.co.uk/downloads/j1mwiring.pdf

Jim

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

I'm just re-wiring my panel for a Silent2 Targa self-launcher. I wanted to
simplify the switching and I did not trust the two miniature switches that
were used and which were connected (without any fuse - I will now add one)
to a very powerful engine battery! I have selected a larger high quality
OTTO switch for the master, and I have used latching switches (anti-fumble)
for the Power Flarm brick and for AUX power for a PDA etc. A relay will
automatically connect the solar panel controller when the Flarm is switched
on, so that it will not latch on provided that you switch the Flarm off
before the master. Note that the Vario and radio will be switched off
internally when power is lost. If I see a voltage on the voltmeter then I
will know that the solar panel is still connected to the panel, but of
course it would not stay latched on when the glider is in the trailer.

Schematic here if anyone is interested:
http://ubuntuone.com/162WfU0vGsXXzw2YpKGGif