Wizbangdoodle wrote:
OP, as you can see, there is a lot of great advice out there when you talk about solar. I hymned and hawed about what I was going to get and finally just dove in. I spent a lot of time trying to nail down all the power needs I had.
I have found that if you are just running 12vdc devices, you can get by with a pretty small system. If you want to watch a lot of tv and toast some bread and vacuum the floors and do a load of laundry, you'd better get some serious battery storage and panels, not to mention a decent inverter. I would guess that if you are just boondocking for an extended weekend and don't spend a lot of time in the trailer, 200-400ah of batteries and 200-300 watts of panels would be more than enough.
pretty consistent with my boondocking experience. I now have about 500W of portable solar. my camping buddy has 320W of portable solar.
we both have 4 GC 6V batteries, around 500AH. He only runs stuff of 12V, including exhaust fan most of the time to keep trailer cool or furnace in the morning and can keep batteries above 75% charge for several weeks of boondocking even with several days of clouds/shade.
With my 500W on our last outing, we ran the portable ice maker all day off the inverter, use the microwave for heating tea, veggies etc. and using the hotel 800W kurig for coffee, etc. and we were able to keep the batteries again between 80 and 100 percent charge for 7 days. that also included running two exhaust fans for cooling for about 6 hours for cooling and the furnace in the morning for an hour or so.
the only time either of us use the generator is for running the AC or in the case of my buddy when he needs the microwave.
and from experience, the haze from forest fires while not seeming real significant can put a big hit on solar output!! the days with clear skies gave great output, the hazy smoke days were as bad or worse than similar cloud cover.
note I said portable solar. portable solar can be aimed for max output, while rooftop is usually horizontal and depending on time of year and latitude can have quite diminished output.
On our last trip in August and early Sept near 45 degrees latitude, laying the panels flat vs angled reduced output by about 30 percent.
but then rooftop panels will charge driving down the road and don't grow legs. but rooftop panels mean parking in the sun instead of shades.
No perfect solution.