Hi Jamie,
Would slushy electrolyte be an problem for a battery? Would this call for replacing the electrolyte? thanks, jay peltz power On Dec 29, 2010, at 8:28 AM, James Surrette wrote: > Hi Jay, > > If the froze and it was "slushy" will not cause internal damage. > > To your point, if they freeze solid - this will generally break the grid and > cause internal shorts. > > I assumed, since the batteries were operational, there is no shorts. > > Per freezing, here is the chart on freezing points and SG levels; > > 1.280 -92° F (-69° C) > 1.265 -72.3° F (-57° C) > 1.250 -62° F (-52° C) > 1.200 -16° F (-27° C) > 1.150 +5° F (-15° C) > 1.100 +19° F (-7.2° C) > > Regards, > > Jamie > > >>> jay peltz <j...@asis.com> 12/29/2010 12:16 PM >>> > I'd like to go back to the freezing battery part as I don't live in real > freezing territory. > > How could they actually freeze and not destroy the housing, internal plate > structure and in the end work at all? > > thanks, > > jay > > > > > > >> From: re-wrenches-boun...@lists.re-wrenches.org >> [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Allan >> Sindelar >> Sent: Wednesday, December 29, 2010 10:41 AM >> To: dahlso...@gmail.com; RE-wrenches >> Subject: Re: [RE-wrenches] Trace inverters undercharging batteries. >> >> Jesse, >> Don't waste your time on those batteries; they are all toast. Don't replace >> them with the same; four strings is poor design. Read the article about >> off-grid batteries in the current Home Power, and then sell the customer a >> set of 12 (or 24; either one string or two is OK) 2V industrial cells, such >> as HUPs from Northwest Energy Storage or K-series Surrettes. Size unknown. >> The existing full bank was 1400 A/hr if the cell cases had black covers, >> 1600 A/hr if the tops are blue, to give you an idea. >> >> BP modules from 1998 would have most likely been 12V 75W or 85W, meaning >> 900-1000 watts; too small an array for that size battery bank if the home is >> used full-time; OK for a seasonal or weekend cabin. >> >> Only with new batteries can you even tell what the inverters are doing. My >> hunch is that the inverters aren't at fault. However, given the poor quality >> of the original installation, they likely are set to default setpoints, >> which can charge at a very high rate (about 220A at 28.8V for two if the >> gennie is big enough) but won't get batteries full (and can't equalize >> them), as the default setpoints are too low. And I'll bet dollars to >> doughnuts the default setpoints are in place, as the inverters have been >> shut down sometime in the last 12 years, losing any original programming >> settings. >> >> You might see about getting an experienced off-gridder in your frozen region >> to work with you. Maybe Darryl could consult now, then make one trip out to >> set up the system once the new batteries are in. This was the classic >> late-90s system with a later charge controller upgrade, but if you have >> never worked with this equipment, you're likely to set it up for a repeat >> failure years down the road. >> >> Just read Jamie's post - while his advice is spot on, of course, you need to >> decide if it's worth your while. I'd be more inclined to try his approach if >> the battery bank was three years old, not 12. That's a huge amount of time >> spent, working with acid and an unknown set of hazards, with at best the >> possibility of a few years' use. I'd suggest that unless it's your >> father-in-law's cabin, and you value the chance to hang out there for a >> week, it's not worth your time or the customer's, especially given that you >> acknowledge having little off-grid experience. >> >> Allan >> Allan Sindelar >> al...@positiveenergysolar.com >> NABCEP Certified Photovoltaic Installer >> EE98J Journeyman Electrician >> Positive Energy, Inc. >> 3201 Calle Marie >> Santa Fe, New Mexico 87507 >> 505 424-1112 >> www.positiveenergysolar.com >> > > > > > This email and its attachments have been scanned by iConnection E-Mail > Firewall for viruses, spam, and malicious content. > > The information transmitted in this email is intended only for the entity or > person to which it is addressed and may contain confidential/privileged > material. If you received this in error, please contact the sender and delete > the material from any computer. Any review, retransmission, dissemination, or > other use of this information by persons or entities other than the intended > recipient is strictly prohibited. %^^% > _______________________________________________ > List sponsored by Home Power magazine > > List Address: RE-wrenches@lists.re-wrenches.org > > Options & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out participant bios: > www.members.re-wrenches.org >
_______________________________________________ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org Options & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org
