beaujewel wrote:?... but I just want to check I'm not doing something stupid...
Data I have found with Google suggests the pack is 24kWh, a nominal 360 volt, with a discharge rate of 90kW.
90kW at 360 volt requires 250 amps current flow, so I would expect the isolator you have would be rated better than 250 amps at a nominal DC 360 volt. 250 amp at 24v is 6kW, which I expect is more than you need in a motorhome.
It appears these cells are not LiFePO4 chemistry, but Lithium Manganese Oxide chemistry. I would want individual cell under and over voltage protection as well as temperature protection to maxamise safety. Is there protection on the cells incorporating various safety features?