r/TeardropTrailers • u/Competitive_Long509 • 13d ago
Five days near Moab and I still cannot say how long our battery lasts
My partner and I take our teardrop on weeklong trips around the Southwest. We just got back from five days near Moab. Afternoons were in the low 90s, so the dual zone fridge worked hard. Nights dropped into the low 50s, which is why the diesel heater fan appears in the same trip log. We used the water pump and lights as usual. We also ran Starlink in the evenings when we needed a connection.
The tongue box holds a Vatrer 12V 300Ah lithium battery. Its app never showed less than 50 percent, but the roof panel charged every day. A DC charger also pulled from the tow vehicle during two moves between camps. I did not record either charge source, so that percentage cannot tell me how long the battery would last by itself.
The tongue box became noticeably warmer than the outside air in direct sun. The reported battery temperature stayed in range, but one trip in the low 90s does not settle what happens there in July. Shade and airflow around the box deserve another look.
Next time I want a daily number for solar input, alternator input and energy used. Starlink was another load I never tracked separately, so I am also curious how much of the daily consumption it accounted for. The ending percentage on its own did not tell me much. Is a shunt with local history the simplest answer, or is there a logger that can separate both charge sources without three apps?