Try the system that I have. I have a Waeco gel battery 24 amp hour. Will run a fridge for 24 hours without recharge. I have dynamic plugs that go to lighter fittings. All my gear runs from lighter fittings and so it all plugs into the battery. The battery is charged up while I drive along to the site. Every now and then I take it for a long drive to fully charge it. It runs my laptop and scope easily for a couple of days. Cost was 430 dollars including all the fittings. The battery never gains any memory and will last for years if you look after it.
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