BurbMan wrote:
Storage is the primary reason, but since I am installing solar, why not add a little more capacity? I am not looking for portable panels, The idea would be to mount something on the roof and wire it in with a charge controller.
This is a slippery slope, you've been warned :)...
What Doug said - to use a solar for something more than a storage is a whole different thing. With a flat roof-mounted panel, unless your location is so dark and rainy that even a 300W solar solar on most days could only do a trickle-charge in storage - it makes a lot of sense getting more than 140W. And a proper controller.