profdant139 wrote:
If you have been letting your batteries run down below 12.1 volts, they might be damaged. We often get four days from one group 31 battery, without charging it at all. With a 120 watt portable solar panel, it lasts a week or more.
Please don't ask how I learned that improper battery maintenance kills the batteries. Very expensive lesson. Sigh.
I second that. Absolutely no idea how many batteries I've donated to recycling over a 10 year period due to boiling them out from the converter/charger being plugged in all the time. At least 10 batteries..........maybe more We have 300w solar and controller with two 6v Interstate batteries. We never run out of juice.