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electrical:solar:panels [2018/05/19 08:17] frater_secessus [Specifications] |
electrical:solar:panels [2019/05/09 20:11] frater_secessus [polycrystalline] |
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* PRO | * PRO | ||
* least expensive PV per watt | * least expensive PV per watt | ||
+ | * better match for PWM due to slightly lower Vmp. | ||
* CON | * CON | ||
* efficiency (13%-16%) is less than mono. This works out to 3%-5% less power for a given area.((https:// | * efficiency (13%-16%) is less than mono. This works out to 3%-5% less power for a given area.((https:// | ||
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higher voltage panels are more common on the used market, as people upgrade residential/ | higher voltage panels are more common on the used market, as people upgrade residential/ | ||
- | MPPT controllers do a DC-DC downconversion that is quite efficient. If Vmp isn't required most will move PV voltage away from Vmp to prevent power from ever getting to the CC. | + | MPPT [[electrical: |
Higher voltage panels can reduce wire costs; amps are cut in half for the same amount of wattage. | Higher voltage panels can reduce wire costs; amps are cut in half for the same amount of wattage. | ||
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Note that in this example the Power (W) rating is 190, which is the Vmp x Imp (28.60 x 6.64 = 189.904W). | Note that in this example the Power (W) rating is 190, which is the Vmp x Imp (28.60 x 6.64 = 189.904W). | ||
- | In real world conditions [[electrical: | + | In real world conditions [[electrical: |
Panels will get closest to their rated output at ambient temperatures around 32f/0f when the panels will be running about 85F. By the time ambient temperatures are 90F panel temps will rise to 145F and power output will drop about 18.45%.((http:// | Panels will get closest to their rated output at ambient temperatures around 32f/0f when the panels will be running about 85F. By the time ambient temperatures are 90F panel temps will rise to 145F and power output will drop about 18.45%.((http:// |