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Peter, I'd be surprised if you actually use more than 500w across your entire system. I can run my rig up at Leyburn and not drain a 100Ah battery during a night. I only use a 20w panel to recharge, but it's not an issue when I'm only up there once a month at most.
Have a look at the software that comes with your UPS, it may be able to tell you what the load of your system is?
DT
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