I'm use a completely 12V system at my dark sky setup. Much quieter - no generator, or fans from power supplies and I'm not worried about dew getting in to 240V equipment.
I run the laptop via a Jaycar 12-19V adapter and everything else is natively 12V (mount, CCD, Dew heaters, robofocus, lightbox, water pump).
My batteries are second hand, some salvaged from a motor scooter repair shop. The current draw isn't high, so older batteries seem to be suitable. I've recently rewired the setup to include fixed links and polarised plugs to reduce the risk of sparks in the darkness.
All the best.
DT
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