I have looked via the search and not found a clear answer..
To save running additional wires through already crowded firewall grommets is it a no-no to use existing circuits?
This is a LandCruiser 4x4 in which there already is a Bluesea busbar for chassis ground inside the vehicle, via 4 awg marine Ancor wire. The battery in engine bay is to chassis ground via 2 awg Anchor marine wire (all lugs properly crimped).
For positive circuits to the interior there is an 8 awg (20 amp maxi fuse at the battery) to the back of the vehicle with distribution via a Blue Sea fuse box.
There is also a 4 awg marine Ancor positive wire circuit to a busbar at the back of the vehicle for an air compressor and inverter, fused with a resettable 70 amp Cooper Bussman breaker at the battery.
Both the 8awg and 4 awg runs are 12’ to 14’ runs from the battery.
What downfall would there be of running the output (battery side) 0f the MPPT 100/15 battery + connection to either of the positive circuits and using the chassis ground circuit for the battery – connection, instead of a new run (would use ancor marine 10awg if needed). The circuits are oversized for what is needed for the 100/15 so resistance and drop are minimized if I’ve figured things correct.
The solar panel positive and negative will be direct to the MPPT 100/15.
The Load side of the MPPT 100/15 will not be used.
Thanks for your thoughts and ideas.
