I am reading the spec sheet. I linked it, you can read it yourself. Do you think they are lying? I sold and installed solar panels and wind generators for some years, I am not unfamiliar with the technology. The panel puts out 250 watts at 29.6 volts and 8.44 amps. Do you think it really puts out 300 watts at 34 volts but they aren't telling you? Back in the day before MPPT was common we always told customers they would maybe get 2/3s of the listed power out of any solar panel at best. Actually, speaking of that, many MPPT controllers are China specials that really are NOT MPPT, but PWM controllers with a new label. Easy test is current in vs. current out. An MPPT could take 28 volts at 1 amp and give you 14 volts at 2 amps. PWM never can increase the amperage above what the panel puts out. My panel is maxed at 2.8 amps and I have seen maybe 2.5 into the battery at best with my PWM controller.
Joe Coquina From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Bill Bina - gmail via CnC-List Sent: Thursday, December 01, 2016 10:32 To: cnc-list@cnc-list.com Cc: Bill Bina - gmail <billbinal...@gmail.com> Subject: Re: Stus-List Where are we buying solar panels? In the world of science and mathematics, anecdotes are not not considered data, and data is not knowledge. Believe what you like. :-) Bill Bina On 12/1/2016 9:57 AM, Della Barba, Joe via CnC-List wrote: Not sure I agree. I have never seen solar panels sold at suboptimal power points. I grabbed one random model from the Miami Electrical site someone mentioned and it is no different: http://www.suniva.com/documents/OPTXXX-60-4-100%2008%2009%2012.pdf Max power is 250 watts at 29.6 volts, and max current is 8.44 amps. If you want 250 watts out of it, you need a MPPT controller to translate 29.6 volts into whatever you need. The Renogy is the exact same, it gets max power at 18.5 volts and you need a MPPT controller to translate into what you need. Are you implying the Suniva panel actually puts out MORE than 250 watts but they are not telling you that for some reason? Their own document states MAX POWER. It would be a bit odd to say the least if 250 watt panels were really 300+ watt panels with the right controller. Joe Coquina From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Bill Bina - gmail via CnC-List Sent: Thursday, December 01, 2016 09:28 To: cnc-list@cnc-list.com<mailto:cnc-list@cnc-list.com> Cc: Bill Bina - gmail <billbinal...@gmail.com><mailto:billbinal...@gmail.com> Subject: Re: Stus-List Where are we buying solar panels? Ohms law supercedes marketing fluff and folklore. Renogy is not as forthcoming as many of it's competitors. No, all panels are not sold to the same standards as Renogy. Can a car manufacturer claim 30 miles per gallon, based on mileage attained without the car's interior installed, and tires inflated to 100 psi? Bill Bina
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