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The only reason I don't have a battery under the bonnet is it simply won't fit. If it's under the bonnet and you want to use it as a backup and winch battery the redarc sb200 may be the go.
The bcdc is a great solution for a camp battery, solar charger, dc-dc, etc. Not so much for a backup starter/winch battery. (IMHO)
I may yet replace the gear I have in the back of my car with the bcdc as it's a nice compact solution.
You can use the bcdc for a backup battery/winch battery, i believe an appropriately rated bypass relay will be needed to take the bcdc out of circuit ( and i could be wrong on that point).
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