Strayed off topic? Not really. All we have talked about is a) why trying to use a 120ah lead acid battery to run what the OP wanted to run for 3 days at a time will ensure the battery's early demise & b) discussed an alternative type of battery - which I accept is not for everyone at this time, but would do what is wanted from a battery of the size to fit where the 120ah one fitted.
As I said in a previous post the best sort of batteries ozzyboy could get would be ones like your ex trucking company one - i.e. cheap. Note however my use of plural. One would still be insufficient.
Your smaller Waeco plus led lighting would use half what an ozzyboy's 80 litre Waeco + led lighting + battery chargers would. Very different scenario.
Cuppa






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