MrWizard wrote:
something like this should work
no reason to bu new panels and reinvent the complete system
SunForce 30amp controller on Amazon
Yeah, well... This is PWM.
It will work with panels wired in parallel. Parallel wiring at 30A current would require a beefy cable #6 or #4. Panels have 6.1A Isc, so this 30A controller will allow 4 panels max.
One of reviews notes that
Schneider/Xantrex 35A is a better choice, and I agree. Costs only slightly more, a remote temperature sensor can be added for $25 (and highly recommended). Better features and quality.
Solar should better be done right the first time. Installing 3 panels, then realizing that you need more, adding more - then buying a bigger controller, possibly replacing the cable with beefier one yet. Unless there are placement problems on the roof, 450W is done better with 2*250W panels and 35-40A MPPT - not PWM. Thin #10 cable will handle it in series, and if another 250W is added later, #10 cable will still work.
