Is my grounding safe?

DIY
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1

I’ve bought a 2021 Bailey touring caravan which is going to be used as an off grid static. It has the EHU socket, A/C fuse box with RCD, DC fuses, A/C charger for the leisure battery. Two way heating and three way fridge. Lights and water pump are 12V from the existing leisure battery.

I’ve bought a Phoenix 12/1200 inverter, a Smartsolar 100/50, a 500W domestic PV panel and a Fogstar 315ah 12V LFP battery, along with requisite isolators, fuses and cables.

I plan to disconnect the internal EHU cable and fit a plug to connect to the inverter. I’ll leave the existing DC circuitry and leisure battery alone… it’ll be kept charged by the inverter (via the existing battery charger) powered by the new battery which in turn will be solar charged.

This is the grounding plan.

Bond AC neutral and earth in the inverter.
Bond new battery negative to caravan chassis.
Bond Smartsolar chassis to battery negative.
Bond inverter chassis to caravan chassis.

Note the the caravan is in a windy location and is chained to steel spikes…thus a decent real earth connection.

Does this look OK?

2

The Victron Wiring Unlimited document has an entire section on grounding. I refer you to this because I’m not that experienced on the AC side.

I don’t think you would bond AC neutral and earth in the inverter. At least in the Quattro/Multiplus devices there is a neutral/ground relay to make that happen when needed. In the US, the neutral-ground bond is expected to be in place at the shore power pedestal. Multiple neutral-ground bonds is a no-no.

My preference is to use an equipment ground busbar. All the equipment grounds go to that busbar, then a single cable goes from the ground busbar to the frame.

Al alternative to using the existing RV converter is to put in an Orion XS 12-12/50 charger. You may not want to have the inverter on all the time. If the existing leisure battery is lead acid, keeping a charge on it will extend its life. Occasional may not be good enough.

3

Thanks Jim.

No such N/E bonding relay on my inverter… it’s on or off via the internal jumper.