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Outdoor & Recreation
Campers, Vans & 4WD's
Solar Panels - Information and Questions
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<blockquote data-quote="Occasional_panner" data-source="post: 355452" data-attributes="member: 7956"><p>You may find as it's cloudy the panels are not putting out enough volts (or amps) to do the dc dc conversion on the mppt controller, that is where a pwm may in fact be better under those conditions.</p><p>Those camping type panels are normally closely matched in voltage to suit a pwm controller, when you fit an mppt and add cloudy conditions the voltage often just isn't enough.</p><p>That controller will accept 75v in, perhaps since you have the folding panels wire them in series to raise the voltage.</p><p>Have a look on the back of the panels and give us the specs, or post a pic of the label, it will most likely be 21v or so open circuit per panel, if so definately wire them in series. </p><p>Keep in mind if you do that it can only be used on a mppt controller efficiently, if you wanted to use it with a pwm you'de have to parallel the outputs again.</p><p>Also, do an open circuit test on each panel to see if each one is ok.</p></blockquote><p></p>
[QUOTE="Occasional_panner, post: 355452, member: 7956"] You may find as it's cloudy the panels are not putting out enough volts (or amps) to do the dc dc conversion on the mppt controller, that is where a pwm may in fact be better under those conditions. Those camping type panels are normally closely matched in voltage to suit a pwm controller, when you fit an mppt and add cloudy conditions the voltage often just isn't enough. That controller will accept 75v in, perhaps since you have the folding panels wire them in series to raise the voltage. Have a look on the back of the panels and give us the specs, or post a pic of the label, it will most likely be 21v or so open circuit per panel, if so definately wire them in series. Keep in mind if you do that it can only be used on a mppt controller efficiently, if you wanted to use it with a pwm you'de have to parallel the outputs again. Also, do an open circuit test on each panel to see if each one is ok. [/QUOTE]
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Outdoor & Recreation
Campers, Vans & 4WD's
Solar Panels - Information and Questions
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