pianotuna wrote:
wopachop,
I suspect the controller is low quality.
You don't have enough wattage to go MPPT
I'd recommend the Grape solar controller with temperature sensor, sold at Home Depot.
There really is no minimum size for an MPPT controller. You can use one on a 10 watt panel if you like as long as it puts out enough voltage to charge your battery.
The question is really is the MPPT controller worth the expense for your small panel. That is a subject of endless debate. I tend to believe it is worth it for the extra charging amps you get out of the system.
