House/solar battery opinions

i think exspanion is dictated by sq ft of roof vs panels not number of watts
2*140 should take almost the same sq ft aka number of cells as one 300w

its easier to position multiple smaller panels that a few large panels

also from experince all this 'partial panel shading' comments don't mean much in real life use in the summer time

multiple 'parallel' panels suffer a small loss when one panel has a little shade from the A/C unit
no big deal.. its still more total power than you would get if that panel was not there.
NOTE I SAID PARALLEL

shading will mean more to snow birds in Az in the winter, but hey, thy can tilt them if they want

i would rather have a roof full of panels that ocassionasly get some reduced output than only a couple of perfectly mounted panels, my over all power gathered is greater

If i was designing a new system
it would be muliple 24v panels in parallel' with mppt contoller
and as many watts as i could get on the roof 'shading be danged'

mena661 wrote:

smkettner wrote:
Why would this be helpful? Not a best practice even if it works.

I was asking because I'm interested in that ETSolar 300W module which would be borderline with the 20A Eco-worthy MPPT controller. I figured maybe buying two of those and run them in parallel. It would be FAR cheaper than buying one 30A Rogue or the 45A Morningstar. I'd much rather have one 300W than two 140W units although the two 140's might be much cheaper. One 300W allows me to expand some in the future where two 140's might not allow that.