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Sounds like you have the familiarity with your system that I referred to MT.
In my case (in the bus - haven't used the Patrol enough to gain that familiarity yet) I expect to see the battery voltage at 12.6 or 12.7 after dark without the fridge cycling on. Most mornings before dawn & with the fridge not cycling on I expect to see 12.4v or 12.5v. Lowest it has ever been is 12.3v (reg has history since installation) & that was after a week of poor solar weather. My wife has been living in the bus for the past 3 weeks & has been recording these voltages & they are still remaining pretty constant, not bad for batteries & panels now approaching 9 years old!
This is a standalone solar system 300ah/375w running a 130 litre fridge, water pump, extractor fan, lights, radio/cd, phone & computer charging via an inverter & satellite tv via another inverter.
2006 4.2TDi ex-Telstra Remote area Camper. Patrol Sold after 11 years of ownership Replaced with 2006 OKA NT Expedition Truck. Cummins, Allison & lots of goodies A Nomadic Life (Blog)
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