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Thanks Craig. That's reassuring :) The isolators are switches. The solar isolator is this one (32A 450V) https://www.ebay.co.uk/itm/Solar-Panel-Isolator-SALZER-D221-83200-700N1-32A-450V-to-20A-650V-/121912721002. The battery isolator will probably be this one...

Hello I'd be very grateful for comments on the attached plans. It's for installation on a double decker bus in the UK. Have I missed anything? Additional relevant information: 6 x 230W solar panels in a 2S3P configuration Epever Triron 40A/100V MPPT charge controller with temperature probe...