Re: [RE-wrenches] Module Degradation - voltage or current?

Walters *Sent:* Wednesday, June 04, 2014 11:30 AM *To:* RE-wrenches *Subject:* Re: [RE-wrenches] Module Degradation - voltage or current? I agree that Voc doesn't seem to degrade as much. I've had a chance to measure several modules over 20 years old, and the Voc is only dropping about 1/2

Re: [RE-wrenches] Module Degradation - voltage or current?

So I read this paper, Smith, R. M., Jordan, D. C., Kurtz, S. R. (2012). Outdoor PV Module Degradation of Current-Voltage Parameters, which seems to seems to suggest that Voc doesn't degrade like Isc degrades. Based on that and other data I've seen it seems like panels that degrade at 0.5%/year

Re: [RE-wrenches] Module Degradation - voltage or current?

-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Bill Hoffer Sent: Tuesday, June 03, 2014 9:00 PM To: RE-wrenches Subject: Re: [RE-wrenches] Module Degradation - voltage or current? Dana Bill Brooks, passed on past data, ( correct me Bill if I am out of date here

Re: [RE-wrenches] Module Degradation - voltage or current?

If it modules not diodes which will give you different issues, no voc change but a combination with less power at 25c best to use a iv curve tool like the solmetric product very cool and printable On Jun 4, 2014 10:36 AM, Nathan Charles nchar...@paradiseenergysolutions.com wrote: So I read this

Re: [RE-wrenches] Module Degradation - voltage or current?

I agree that Voc doesn't seem to degrade as much. I've had a chance to measure several modules over 20 years old, and the Voc is only dropping about 1/2 the rate suggested by others here. I think a more appropriate number might be 0.25% V drop/ year. R.Ray Walters CTO, Solarray, Inc Nabcep

Re: [RE-wrenches] Module Degradation - voltage or current?

[mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Ray Walters Sent: Wednesday, June 04, 2014 11:30 AM To: RE-wrenches Subject: Re: [RE-wrenches] Module Degradation - voltage or current? I agree that Voc doesn't seem to degrade as much. I've had a chance to measure several modules over 20

[RE-wrenches] Module Degradation - voltage or current?

Hi Wrenches, Does anyone know what percentage of module degradation over time is voltage and what is current? I'm wanting to make sure we give ourselves plenty of breathing room on the minimum Vmp of the inverters over the long term so need to try to anticipate how much voltage we'll lose on the

Re: [RE-wrenches] Module Degradation - voltage or current?

-wrenches] Module Degradation - voltage or current? Hi Wrenches, Does anyone know what percentage of module degradation over time is voltage and what is current? I'm wanting to make sure we give ourselves plenty of breathing room on the minimum Vmp of the inverters over the long term so need to try

Re: [RE-wrenches] Module Degradation - voltage or current?

d...@ecotechenergy.com wrote: Subject: [RE-wrenches] Module Degradation - voltage or current? To: RE-wrenches re-wrenches@lists.re-wrenches.org Date: Tuesday, June 3, 2014, 5:41 PM Hi Wrenches, Does anyone know what percentage of module degradation over time is voltage and what is current

Re: [RE-wrenches] Module Degradation - voltage or current?

Dana Bill Brooks, passed on past data, ( correct me Bill if I am out of date here) recommends 1% Power loss per year with approximately 0.5% current and 0.5%voltage. That is also what Solar Energy International Best Practices curriculum recommends. Based on some newer data from larger projects