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 Cc: Bill Bina - gmail <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 On 12/1/2016 9:13 AM, Della Barba, Joe via CnC-List wrote: That is ALL panels. NONE of them provide full power at 12 volts. If you want to see 50 watts, you need a MPPT controller that is essentially a DC-DC converter. Running my cheaper PWM controller I never get the full 50. Joe Coquina From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Josh Muckley via CnC-List Sent: Thursday, December 01, 2016 09:06 To: C&C List <cnc-list@cnc-list.com><mailto:cnc-list@cnc-list.com> Cc: Josh Muckley <muckl...@gmail.com><mailto:muckl...@gmail.com> Subject: Re: Stus-List Where are we buying solar panels? Clearly renogy is providing nominal values for marketing purposes. You can't fit all of the specs in the amazon headline. Josh On Dec 1, 2016 7:54 AM, "Bill Bina - gmail via CnC-List" <cnc-list@cnc-list.com<mailto:cnc-list@cnc-list.com>> wrote: Renogy is not very honest about output. 50 watts at 12 volts is fuzzy math for this panel, whose output is really almost 19 volts. Output should be stated at the working output voltage. That is more like a 30 watt panel when comparing to other brands whose quality factor includes truth. :-) Bill Bina On 12/1/2016 8:15 AM, Della Barba, Joe via CnC-List wrote: This is mine: https://www.amazon.com/Renogy-Watts-Volts-Monocrystalline-Solar/dp/B00DVPPFDS/ref=sr_1_1?ie=UTF8&qid=1480598077&sr=8-1&keywords=50+watt+solar+panel 50 watts - $80. I have had no issues at all with it. Joe Coquina
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