Tommy retired with that, so is no longer a contact point, and I really don't have anything to offer either. A bad cell is highly unusual with the HUPs, I only saw that on a system where the owners were not able to get to one of the cells, and so it went dry. I've recovered cells by charging them vigorously with a large automotive charger set to 6 v, and just put that across the terminals of the individual cell while charging the whole system as well.
Also, the HUPs need a pretty high charge rate to bring the cells to full SG. Depends on the model, but the minimum charge rate can be as high as 200 amps for the largest model. I've attached a spec sheet with minimum charge rates listed. Basically if you aren't getting close to those charge rates, you can end up with sulfation damage long term. I've almost always been able to recover HUPs, but it might take 2 days of EQing at very high voltages (62 v @ 48v nominal) nothing will happen, and then finally the SG will start moving.
Ray Walters Remote Solar On 6/17/2026 11:59 AM, Dana Orzel via RE-wrenches wrote:
Chris I am on the Solar One If no reply let em know I can dive into my battery box & look at ID & Data_________________________________________________________ Dana Orzel GREAT SOLAR WORKS! C – 208.721.7003 E – [email protected] <mailto:[email protected]> W - www. greatsolarworks.com www.solarwork.com <http://www.solarwork.com/> /_“Responsible Technologies for Responsible People since 1988!”_/ _______________________________________________ List sponsored by Redwood Alliance Pay optional member dues here:http://re-wrenches.org List Address:[email protected] Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org There are two list archives for searching. When one doesn't work, try the other: https://www.mail-archive.com/[email protected]/ http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: http://www.re-wrenches.org/etiquette.htm Check out or update participant bios: http://www.members.re-wrenches.org
SO Specs.pdf
Description: Adobe PDF document
_______________________________________________ List sponsored by Redwood Alliance Pay optional member dues here: http://re-wrenches.org List Address: [email protected] Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org There are two list archives for searching. When one doesn't work, try the other: https://www.mail-archive.com/[email protected]/ http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: http://www.re-wrenches.org/etiquette.htm Check out or update participant bios: http://www.members.re-wrenches.org
