What to look out for when buying solar controllers
The solar panel produces energy at a variable rate, which fluctuates vastly based on weather conditions. Cheaper PWM type solar controllers tend to work almost like a switch, so when the battery voltage reaches 13.8 volt, the controller will turn off to avoid damaging the battery, a slightly more expensive PWM type controllers will give a 3 stage charge to the battery.
A high quality MPPT type solar controller is not only more efficient at dealing with the variability of the output form the solar panel, but will also give the battery, the correct charge criteria as selected by the technician who fitted it, charging the batteries to the correct criteria should significantly increase the life span of the batteries which in the long term will save you money.
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