LPG for the heating, fan on eco setting, truma set to 16-19 degrees, depending on how cold it is; we managed with a 230Ah Lithium Battery in Spain from December 2025 to late February 2026, despite December and January being really bad weather with storms, darkness and cold, so the 180w solar panel wasn't able to do much to recharge the battery. Because I knew it would be tight, needing battery power to raise and lower the bed, I checked the SOC every evening - the fan took the voltage down by no more than 0.2v during the evening.
Since returning to Scotland, we have replaced the Lithium with a 320Ah version, added 120w solar panel, bpught a portable panel, and replaced the B2B to give us a healthy margin for a day without solar harvesting
The gas fired ones use about 1a when running (more if the fan goes onto high) and I think the diesel-fired ones use about 2a, plus about 10a for a few minutes when starting up and shutting down.
We leave our gas one running for several days at a time: maybe a week or so, with no real impact on the batteries.
I find my truma is very low battery consumption it may consume about 1 amph but the thermastat is continuously turning the heater off so electricity consumption is less than 24 amp over a 24 hour period,
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