Right, here's what I've learned doing this on my static caravan setup.
The basics
Your earthing rod needs to go minimum 1.5m into the ground — deeper if your soil's poor.
Matching's crucial but don't sleep on the wiring either. I've got two 200Ah LiFePO4s in parallel on my static caravan and used proper 35mm² cable with equal lengths to each cell — even a few...
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