Let me preface everything by saying that most of this is new to me, and that my understanding of electrical power consumption & storage along with solar systems, is pretty rudimentary. Please don’t be shy in pointing out errors in my calculations or assumptions! Let me also add that a lot of what's below was covered, or at least touched on, by some of the responses in my previous newbie post.
Here’s the question: Is the stock solar system of the Boondock adequate for off-grid camping under the following circumstances:
· Time off grid – 3 days
· Electrical usage (daily) – 500 Wh
· Factory-supplied 133 W solar panel & Victron controller
· Upgraded battery system - dual 6 volt Pb-acid batteries, nominally rated at 116 Ah (232 Ah total)
Power consumption: Refrigerator uses 360 W per day (per factory for Isotherm CE 65) and the balance of 140 W is the total used by all other devices.
Batteries: 232 Ah converted to Wh is 2,784 (232Ah * 12v) - adjusted to 50% min safe state of charge gives 1,392 Wh usable [(232Ah*0.5) * 12 volts].
The factory solar panel for the Boondock is nominally rated at 133 watts; adjusted to 93 effective watts using 70% (133W * 0.7 ~ 93W).
For 3 days of boondocking, if I want to keep my battery’s SOC at >50%, I need to limit average daily power use to 464 watts (1,392 Wh / 3 da) OR ensure that I get at least a little help charging from the solar panel
Takeaway: Three days of boondocking looks pretty doable with a 232 Ah battery system.