Wrenches Bill you might want to recheck your VOC on the panels, l had shell 150's and as l recall the number is far less. Strings of 2 fit the voltage, seems the 150 was closer to 30 as a VOC each. You did not say or l missed it if there was a grid connection or not, if not l can see voltage and currents like that. Also Off grid mid day hot panels are way down from STC. With 14 modules you are stuck with 2 per string but a higher VOC combined will help a great deal if you can find it. Jerry
On Oct 2, 2017 10:41 AM, "Ray" <[email protected]> wrote: > Depending on the light conditions, that could be a normal reading. I've > seen the MPPT voltage approach battery voltage in low light/ cloudy > conditions. If this was in full sun, I would start isolating the strings, > and see what their individual performance is. Also as mentioned, it could > be a loose connection, so a thermal imaging camera is great to "see" those > bad connections. That should be a good system, I don't know of any > problems with the Shell modules from that time period. > > Ray > > Remote Solar > > > On 10/2/17 9:21 AM, Steve Bell wrote: > >> Hi Bill, >> >> The original Voc of the array was probably about 91 volts, the original >> Vmp >> of the array was probably about 68 to 70 volts. The 58 Vmp from the array >> still seems somewhat low. I would check for bad/corroded connections >> causing a voltage drop while under load. >> >> Best Regards, >> >> Steve Bell >> >> On Mon, Oct 2, 2017 at 8:27 AM, frenergy <[email protected]> wrote: >> >> Off-gridders, >>> >>> Checked in on a 13 year old system and something caught my >>> eye. Yes, everything is 13 years old. First off: PVs: 14 (7 strings of 2 >>> PVs each), Shell 150's, batts: HUP 845 AHR, 48 volt system, MX60 CC. So >>> the MX60 was reading (mid day) ~1500 watts or ~27 amps (somewhat low for >>> the array but acceptable considering age, soiling, tilt, etc. >>> Regardless, >>> Volts "IN" were 58, batt volts were ~53.5. This info was taken from the >>> MX >>> display. >>> >>> For PVs that have an MPPT rating of 45.5 volts ( X 2 per >>> string = 91V), that 58 volts seems especially low. Normal?? Possible one >>> string is pulling down the rest? Feedback welcome. >>> >>> Bill >>> >>> Feather River Solar Electric >>> Bill Battagin, Owner >>> 4291 Nelson St. >>> Taylorsville, CA 95983 >>> 530.284.7849 >>> CA Lic 874049 >>> www.frenergy.net >>> >>> >>> --- >>> This email has been checked for viruses by Avast antivirus software. >>> https://www.avast.com/antivirus >>> >>> >>> _______________________________________________ >>> List sponsored by Redwood Alliance >>> >>> List Address: [email protected] >>> >>> Change listserver email address & settings: >>> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >>> >>> List-Archive: http://www.mail-archive.com/re >>> [email protected] >>> g/maillist.html >>> >>> List rules & etiquette: >>> www.re-wrenches.org/etiquette.htm >>> >>> Check out or update participant bios: >>> www.members.re-wrenches.org >>> >>> >>> _______________________________________________ >> List sponsored by Redwood Alliance >> >> List Address: [email protected] >> >> Change listserver email address & settings: >> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >> >> List-Archive: http://www.mail-archive.com/re >> [email protected]/maillist.html >> >> List rules & etiquette: >> www.re-wrenches.org/etiquette.htm >> >> Check out or update participant bios: >> www.members.re-wrenches.org >> >> > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: [email protected] > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: http://www.mail-archive.com/[email protected] > g/maillist.html > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org > > _______________________________________________ List sponsored by Redwood Alliance List Address: [email protected] Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://www.mail-archive.com/[email protected]/maillist.html List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out or update participant bios: www.members.re-wrenches.org
