Solar Switch
Hi All - When I installed my solar setup I put an in-line fuse between the panels and the charge controller, but unfortunately, it's on the roof. Never occurred to me I might want an easy way to shut...
Forum Discussion
330w aimed at a high sun should get you Isc value of 330/130 x 8.2= 20.8 amps with PWM. In theory you might get another 8% with MPPT depending.
If your panels are flat on the roof, that changes a bunch (mostly less) depending on your latitude and time of year.
I have been using 300w (3 x 100) aimed, but with an MPPT controller (Tracer A 20 amper) that limits input to 260w, I have never seen over 19 amps output even when aimed at high sun. Panel wattage reduction from sun heating is the reason, so the array is always under 260 out of that supposed 300w anyway.
When I used the 300w with a "normal" PWM (Solar30) I got 3 x the panel Isc of 6.2a = 18.6a aimed at high sun.
IAW it did not help if I used the MPPT Tracer 20 amper instead of the Solar30, but it might have got me an extra amp at high noon if I had paid extra for the Tracer 30 amper that does 390w input instead of 260w. As it turned out I got it all done before dark anyway, so it didn't matter.
EDIT--forgot to answer the question! OK with 330w input less 10% for heat you have 297w minus some for line loss 2%? so 291w and say Vmp (Bulk only) is 31v, that means Imp is 9.4 amps on the 24v input line to the 24/12 controller. Or else with PWM is it still 20.8 amps
If your panels are flat on the roof, that changes a bunch (mostly less) depending on your latitude and time of year.
I have been using 300w (3 x 100) aimed, but with an MPPT controller (Tracer A 20 amper) that limits input to 260w, I have never seen over 19 amps output even when aimed at high sun. Panel wattage reduction from sun heating is the reason, so the array is always under 260 out of that supposed 300w anyway.
When I used the 300w with a "normal" PWM (Solar30) I got 3 x the panel Isc of 6.2a = 18.6a aimed at high sun.
IAW it did not help if I used the MPPT Tracer 20 amper instead of the Solar30, but it might have got me an extra amp at high noon if I had paid extra for the Tracer 30 amper that does 390w input instead of 260w. As it turned out I got it all done before dark anyway, so it didn't matter.
EDIT--forgot to answer the question! OK with 330w input less 10% for heat you have 297w minus some for line loss 2%? so 291w and say Vmp (Bulk only) is 31v, that means Imp is 9.4 amps on the 24v input line to the 24/12 controller. Or else with PWM is it still 20.8 amps
