Thanks you for your help. I'm a poor off-grid guy. This should be a learning experience then....the one time I visited the system around 10:AM,, both CCs were in Bulk, and no grid blackout the night before. Methinks I should also borrow a programming dongle from a colleague for this one....
Dan Fink Adjunct Professor of Solar Energy Technology, Ecotech Institute IREC Certified Instructor™ for: ~ PV Installation Professional ~ Small Wind Installer Executive Director, Buckville Energy NABCEP Registered Continuing Education Providers™ 970.672.4342 On Mon, Jul 18, 2016 at 6:27 PM, Maverick Brown <[email protected]> wrote: > Dan > > Barring some non-factory-default settings, they are not likely running on > battery power at night. > > When the grid is up, the inverter will go silent at night (asleep) [with > --- three dashes on its LED display]. That's good. > > During the day, the inverter will "prevent" the battery voltage from going > above its sell voltage (unless some other mode is on like Grid Support or > Standby, etc.) The charge controllers will attempt to Absorb & Float, but > the inverter will offload the energy by keeping the voltage at the Sell > setting. I generally set Sell to the recommended Float Voltage++. I set the > charge controller float to 1.0v higher and Absorb as appropriate. > > There is a lot more to unpack here. > > Flooded batteries will consume a good amount of power just to maintain > float. > > As a defense against sulphated plates forming, I program the inverter EQ > button for a heavy Absorb / mild EQ and instruct the customer to press it > (every other month opposite month from watering??) > > Are you getting 20-25 kWh per day in production? > > PS having the inverter always feed the critical loads panel is exactly > it's intended use. > > Thank you, > > Maverick > > > Maverick Brown > > Maverick Solar Enterprises, Inc. > SunFlow Systems > Office: 512-919-4493 > Cell: 512-460-9825 > > Sent from an iPhone. > > On Jul 18, 2016, at 6:50 PM, Dan Fink <[email protected]> wrote: > > Maverick; it's 6.0 kW of PV, 2 Midnite Classic 200s, Conext XW+ 5548, and > 8 Crown Embassy VRSLA 6CEA390 for 390 amp-hours, 48v. Concerns me to be > cycling those batteries every night when it's not supposed to happen as per > the permit package. > "Notes - Battery Backup: During an outage, an automatic transfer switch in > the inverter opens the grid interconnect, isolating the inverter from the > utility to prevent back-feeding the local power lines. The inverter then > draws from the battery bank to provide AC power to the backup sub-panel. > Battery power is only used to provide power to the backup sub-panel. The > Battery inverter only sells energy to the grid from the solar array when > available and not from the battery bank. The battery backup inverter is UL > 1741 and IEEE 1547 compliant." > > Dan Fink > Adjunct Professor of Solar Energy Technology, Ecotech Institute > IREC Certified Instructor™ for: > ~ PV Installation Professional > ~ Small Wind Installer > Executive Director, Buckville Energy > NABCEP Registered Continuing Education Providers™ > 970.672.4342 > > > > On Mon, Jul 18, 2016 at 5:23 PM, Maverick Brown < > [email protected]> wrote: > >> Dan >> >> Does the inverter go silent at night? (---) on the inverter display? >> >> There are lots of settings that can influence sell amount. >> >> What type and size is the battery bank? >> >> What is the solar size? >> >> Thank you, >> >> Maverick >> Cell: 512-460-9825 >> >> Sent from an iPhone. >> >> On Jul 18, 2016, at 5:56 PM, Dan Fink <[email protected]> wrote: >> >> Installer went out of business, all I have to troubleshoot with is an >> as-built 3-line that "may or may not be right." The charge controllers are >> a pair Midnite Classic 200s. Customer complained that system selling only >> 2/3 of what was predicted back to the utility; that appears to be because >> everything out of his critical loads subpanel is running off the battery >> bank all night, every night, grid or no, so it takes 1/3 of the day to get >> the batteries charged up again every day and start selling to the grid. >> >> I have very little experience with the XW+ thus my question for the folks >> here. My plan for next week is to show up, make my own as-built 3-line, and >> recommission the inverter. Anyone else seen this sort of thing before? Hard >> to believe that an electrician would mis-wire or not wire the bypass, I'm >> thinking software setting. >> >> >> Dan Fink >> Adjunct Professor of Solar Energy Technology, Ecotech Institute >> IREC Certified Instructor™ for: >> ~ PV Installation Professional >> ~ Small Wind Installer >> Executive Director, Buckville Energy >> NABCEP Registered Continuing Education Providers™ >> 970.672.4342 >> >> >> >> _______________________________________________ >> 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 >> >> >> _______________________________________________ >> 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 >> >> >> > _______________________________________________ > 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 > > > _______________________________________________ > 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 > > >
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