Thanks for the responses everyone. I never considered that acid may have been added. I'll have to press him a little bit on that. He's definitely "old school" so I wouldn't be surprised if he tried this. Dan, I calibrated the refractometer, so I have confidence in its readings. When I say all over the place, we had 3 cells of specific gravity of 1.0, the rest ranged from 1.24-1.33. He is going to equalize again, but we will see if he added acid.
Thanks again. On Tue, Aug 12, 2014 at 8:13 PM, William Miller <will...@millersolar.com> wrote: > Mac: > > Someone has added acid to the cells. I've had the same experience and > found out the truth later on. > > William > > Miller Solar > > On Aug 12, 2014, at 6:54 PM, Mac Lewis <maclew...@gmail.com> wrote: > > Hello wrenches, > > I just went on a service call for a new client. He had a bank of 4 year > old Interstate L16HCL batteries, 2 strings of 8, 48V system, 840Ahr. We > went through the batteries and got specific gravity on all of the cells > post-equalization. I was a bit surprised to see some very high numbers ie > over 1.32 for the specific gravities (higher than my refractometer goes). > The specific gravities were all over the place, but I haven't seen numbers > this high. I don't have a great explanation. He has a stacked 3648 VFX > Outback system, and the set-points were 58.8V Absorb for 2 hours, and 62V > Equalize for 2 hours. He has a decent amount of solar (about 3400W) and a > 1000W wind generator. > > Any ideas why the specific gravity is so high on some cells? Also, is > there anything wrong with having SG this high, post-equalization? For this > very standard battery, what settings do you go with (Bulk, Absorb, Float, > Eq, and times for Abs and Equalization). > > Thanks in advance > > > > -- > > > > Mac > > > _______________________________________________ > 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 > > > -- Mac Lewis *"Yo solo sé que no sé nada." -Sócrates*
_______________________________________________ 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