More Solar for "Us"
Ok, I went off.the deep end? Bought 3 used 37watt uni-solar panels and a blue sky 2000e controller for the hefty price of $400, They were being listed as 75w panels, they are not The tested open...
Forum Discussion
Yes 17.5 to 18 VMP...working voltage
But 21+ VOC open circuit voltage no load
And this is the same series or parallel
So 5 series panels would be 85~90 volts working 105v open circuit
Computing power gain with mppt should be done with the Working Volts
Not the open circuit volts
90v*8 amps 720w solar input versus 18*40 amps 720 solar input
But the mppt will give more amps output to batteries
The pwm will lose approx 3v * 40 amps 120w
With a peak output of 600w
While the mppt peak will be closer to 700w
This of course is ideal conditions
Low batteries clear sky high sun angle
But 21+ VOC open circuit voltage no load
And this is the same series or parallel
So 5 series panels would be 85~90 volts working 105v open circuit
Computing power gain with mppt should be done with the Working Volts
Not the open circuit volts
90v*8 amps 720w solar input versus 18*40 amps 720 solar input
But the mppt will give more amps output to batteries
The pwm will lose approx 3v * 40 amps 120w
With a peak output of 600w
While the mppt peak will be closer to 700w
This of course is ideal conditions
Low batteries clear sky high sun angle
