minimum amount of solar
I am considering starting into the solar age. I currently have 4 group 27 batteries and have no problem going for weekends dry camping with our current battery capacity. All of our lights have been ...
Forum Discussion
babock wrote:
For every 100W, you will get 5A with a PWM controller if you tilt. If you figure 5 hours of equivalent sun per day, that is 25AH. With a 100AH battery at 50% SOC, you will need 200W of solar to bring it back. If you flat mount your panels, figure on a 30% loss.
This is a useful first approach, but could be misleading if not careful.
Actually, a typical 100w panel has an Isc of 6.2 amps, which is what you get to the battery bank with PWM when the panel is aimed at a high sun. Most of the day either side of noon, you will get less of course, even when aimed. AH haul will vary widely depending on time of year and location.
The difference between flat and aimed or just tilted to South will vary a lot too depending on your latitude and time of year.
You can get closer to the right answer for your own situation if you can specify your likely locations and times of year, and then check the on-line solar tables for that.
