21 replies to this topic

[Jon R]

Section 4.4 of the MPPT manual covers this. It states that a separate chassis ground “is permitted” because the chassis is isolated from both the positive and negative power connections. Note it does not say “is required.” If you would like a safety ground connected to the chassis you could connect it to your camper negative system (NOT the PV array negative). I chose to leave mine floating and have no chassis ground connection.

Edit: I just noticed you mounted the MPPT charger in your water cabinet. It’s probably a good idea to run a chassis safety ground given that location and the potential for water leakage.

Edited by Jon R, 24 January 2024 - 08:39 PM.

[K7MDL]

If the controller case is metal, grounding it may help reduce the often reported RFI from many of these units.  Finding a way to do that ground connection effectively is another matter.