I upgraded my fiver from the original Grp 24 with 75AH to a Costco Grp 27 with 110AH in my 2nd season and dry camped at Grand Teton for 3 days. I had no volt meter at the time, but had converted to LED lights and set the temp for 50 because it was dropping below freezing at night. The slides came in and the stabilizers and landing gear came up, but I had no idea what life I had left.
Have since upgraded to dual Trojans and looking at a volt meter when the furnace comes on is scary as it sometimes drops below 12v. However, once the furnace shuts off, it gradually rises to over 12.6v. Running minimal lights and my CPAP all night from a 12v outlet usually leaves me at 12.5-12.6 in the morning, so I don't worry about it much anymore. My Trojans, when fully changed, show 12.7-12.8 as opposed to the single 12 that peaked at 12.6.
I now have 200w of solar on the roof and an additional 100w portable and only occasionally glance at a volt meter.
