For the last few days (on and off) I have been reconfiguring my aux battery set up in the rear, as it now has a dc-dc charger I wanted to be able to remove the fridges off the battery whilst on the charger plus I have added a solar input as well as a 24vdc input for when we have mains available (12-24v fridges only).
As this needed to be configured so it does it all automatically some relays and fusing was required so I repurposed an OBD2 PDC, reconfigured it for dual input to allow for the above requirements , I also made a negative busbar for all the gnds to connect to solidly and fitted anderson plugs for the fridges, compressor, solar etc as this is also removable it needed to be plugged in.
I also added twin voltmeters in the dash to be able to monitor the charge level of the aux battery as well as a meter for the cars voltage as the dash one is useless, the charger can be bypassed if I want with the rocker switch between the meters allowing for the dual battery controller to be turned off, switched to charging by the dc-dc or bypass the dc-dc if I want (the charger is 20a limited).
Only issue to sort out is when switched to bypass the dual battery controller won't turn on, I suspect it's due to the voltage drop across the diode in the switching configuration but as yet to verify....
Still with some tidying to do....
A heavily modded OBD2 PDC...
Not much room behind this for the wiring and the busbar is tucked in there as well....
Ign off..
Ign on...
Just need to lable the lid now to reflect the new fuse ratings and designations for the fuses and relays for easy remote location fault finding....