Since Surrette was mentioned, even if you used the house loads and monitored the load current on the batteries with a DC current clamp... That would work for us... there is a webinar on the procedure on our YouTube channel.
On Aug 6, 2017 5:40 PM, "Dave Angelini Offgrid Solar" <offgridso...@sti.net> wrote: > This is a bare bones but easy method. I am not sure Trojan would approve. > You need a working bank and an inverter. A variac is used to set the AC > voltage on an electric heater. A clamp-on DC ammeter is used to set the > variac for the exact specified DC current (25A). > A descent Variac is not that expensive and this set-up did work for > Surrette, at one time. Interested to hear what is better and easier! > > Dave Angelini Offgrid Solar > "we go where powerlines don't" > http://members.sti.net/offgridsolar/ > e-mail offgridso...@sti.net > text 209 813 0060 > > > Esteemed Wrenches; My customer's saga of failing Trojan LC-16s continues, > > unfortunately. It's 8 Trojan L-16 P AC in series/parallel for a 24v bank > I > > think I have strong warranty claim on at least one battery. Trojan's > > warranty claim form requires a series of tests, including using a load > > tester "approved" by Trojan (whatever that means). to put a load of 25 > > amps > > on each battery and time down to 1.75 volts per cell, specific gravity > > checks, etc. > > > > This situation is worth purchasing a load tester I think. I'd like one > > that > > can do 2v, 6v and 12v batteries. Searching online, 6/12v seems common, > not > > seeing anything that can do 2v other than the Fluke BT series, which is > > way > > out of my off-grid price range. And I'm not seeing an automotive variety > > where you can set the load amperage. > > > > Anyone have product advice for something that they use and like? Any help > > appreciated. > > > > DAN > > > > PS---backgrounder and images....................... > > > > Numbering the batteries 1-2-3-4 left to right: > > > > ~Battery #2 was installed as a replacement only one month ago (July 2017) > > and has a late 2016 date code. The 2 hot cells have such low Specific > > Gravity that they don't register on the hydrometer or refractometer. > > > > ~Battery #3 was installed as a replacement in mid 2016. I found the cause > > of the problem that killed the original battery (the entire bank was > > installed 2014), an incredibly poorly crimped interconnect cable from > > AltEdirect (I posted here about it then). They offered to replace the > > cable > > (thanks, folks) but it's of more value to me in teaching my hands-on > solar > > college classes. > > > > ~Battery #3 has a 2013 date code, implying to me that it sat on the self > > for almost 3 years before the distributor dumped it on me as a one-off. > > Next time, I will demand the same date code on each battery. > > > > ~Battery #1 has NO date code. First time I've seen that. > > > > ~In any case -- all the problems seem to be on only the outer parallel > > string. So the customer approved a complete re-cable, and I'm going to > > build them all myself after the expensive AltE cable fail. > > > > > > Dan Fink > > Professor of Solar Energy Technology, Ecotech Institute > > IREC Certified Instructorâ„¢ for: > > ~ PV Installation Professional > > ~ Small Wind Installer > > Executive Director, Buckville Energy > > NABCEP Registered Continuing Education Providersâ„¢ > > 970.672.4342 > > _______________________________________________ > > List sponsored by Redwood Alliance > > > > List Address: RE-wrenches@lists.re-wrenches.org > > > > 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-wrenches@lists.re-wrenches. > org/maillist.html > > > > List rules & etiquette: > > www.re-wrenches.org/etiquette.htm > > > > Check out or update participant bios: > > www.members.re-wrenches.org > > > > > > > Dave Angelini Offgrid Solar > "we go where powerlines don't" > http://members.sti.net/offgridsolar/ > e-mail offgridso...@sti.net > text 209 813 0060 > > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: RE-wrenches@lists.re-wrenches.org > > 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-wrenches@lists.re-wrenches. > org/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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