I use a 33AH SLA battery, as I only use it for the mount I would expect it to last 2 nights maybe 3.
Although if mains power available I try to top it up each day, usually takes less than an hour - benefit of a regulated 12A charger.
Ill be bringing the charger to SPSP so anyone needing a quick top-up is welcome to hook up.
On the subject of inverters, to run my laptop I dont use an inverter I have a 'thingy' that runs off a battery and ups the voltage to the required and plugs straight into the lappy, seems to work ok.
Any views if this would be more/less efficient than going via an inverter ?
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