Voltage switched relays can be had for under £20 so thats £630 labour
Joshing aside, as has been said, a split-charge relay isnt a good option for a smart alternator.
Theres an excellent explanation as to 'why' at the bottom of the Travelvolts front page.
Costs depend on how much you're prepared to do yourself - a professionally installed
DCDC system with a big battery might well approach £650
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