Sometime back I asked for help in figuring out my crazy electrical
system in my '77 13' Scamp
the the PO had unfortuanately "Updated". Well we got that sorted out and now I want to correct the mess.
I recently added a 100W solar panel
and 30w MPPT controller. Its working fabulously. but I still have the load for the trailer running from the battery
to the lights
, fan, etc. I don't have a converter or inverter and don't seem to need it. I specifically have 2 LED lights
, 2 cigarette lighter type plugs, a Fantastic fan, stove vent with light
, and 3way fridge
(I probably won't be running the fridge
on 12v). Although I have all of this stuff, my 12v ussage is quite low except for use of the fantastic fan.
I want to redo the wiring to have the load come off of the MPPT controller (Isn't that the way it should work?). Here's the info on the controller:
Applicable to various types of batteries,
Temperature sensor battery
Overload protection (automatic restoration)
Short circuit protection (automatic restoration) ,
Reverse discharge protection
Reverse polarity connection protection (automatic restoration)
Under voltage protection
As shown in the following diagram of connection,the controllerís six terminals have the definite connection sign.
- Always keep the battery on full voltage condition.
- Prevent the battery from over-charging.
- Prevent the battery from over-discharging.
- Prevent the battery from reverse charging to solar panels during nights.
- Reverse Polarity Protection for Battery
- Reverse Polarity Protection for Solar panels
- When the current of the load exceeds the rated current of the controller, the controller will activate the protection mode and lock up.
- When the load short circuited, the controller will activate the protection mode and lock up.
- When the battery voltage is low, the controller will automatically cut off the load from the system.If the voltage of battery is back to normal and the load will restart working.
- Thunder protection
- According to the battery voltage grade,the controller can automatically set charge-off voltage, the load-off voltage, the load-restore voltage.(The parameter is default under 25? condition, locked by the CPU procedure,cannot adjust.)
- The controller will automatically compensate the temperature of the charging voltage according to the changes of ambient temperature
I am thinking about using this fuse box from Vintage Trailers. They recommend using a 12v 55 amp circuit breaker between the battery and fuse box and 8 gauge wire.
1. Is this the right way to wire the 12volt system?
2. Is there something better to use than VTs fuse box?
3. Do I still need the 55 amp circuit breaker with the MPPT controller and should it go between the controller and the fuse box?
4. Do I really need 8 gauge wire or is 10 sufficient?
5. I don't want overkill, but want it to be safe; is it?
6 Anything else necessary here that I'm missing.
12V RV Fuse Box
12V Circuit Breaker 50A
Thanks in advance for any advice you can provide me.