All magnum auxiliaries are battery direct ( AGS,BMK) so they drain the battery. Jay Peltz power
Sent from my iPhone > On Dec 17, 2014, at 10:20 AM, Allan Sindelar <al...@sindelarsolar.com> wrote: > > Corey, > In a somewhat similar situation years ago: a client had installed a > generator/inverter/battery system at an off grid cabin. The system was > intended to use the Trace SW4024 inverter to maintain AC to support the > generator's battery charger; then send an autostart signal to the gennie, > which would recharge the batteries. It was a perilous design, destined to > fail, and it did. Once the generator failed to start, the inverter reached > low voltage disconnect and some remaining DC load dropped the battery voltage > further, to where the inverter couldn't be booted up to recharge the > batteries. And of course, without the charger the generator was useless. > > From the Don't Try This at Home Dep't. Archives: I brought two old 12V > batteries with me to the site and set them up in series next to the dead > bank. I started the generator, disconnected one battery cable at the bank, > ran jumpers from the cables to the two I brought, booted up the inverter, > started the charging process, reconnected the disconnected cable, and removed > the two old batteries. The inverter continued to recharge the dead bank, > although the batteries were permanently weakened, of course, and were soon > replaced (and some trickle-charge PV added). Basically I jump-started > the dead batteries as you would do with an automobile. > > I suspect that you could do the same with the Magnum in your situation, and > it would be much more effective than 1-2 weeks of slow charging - as in one > trip, and the chance to focus your time and effort on the causes of the > problem. > Allan > > Allan Sindelar > al...@sindelarsolar.com > NABCEP Certified PV Installation Professional > NABCEP Certified Technical Sales Professional > New Mexico EE98J Journeyman Electrician > Founder (Retired), Positive Energy, Inc. > 505 780-2738 cell > > >> On 12/17/2014 10:36 AM, Corey Shalanski wrote: >> Clarification and Update: >> - I believe I may have inadvertently thrown Magnum under the bus in in my >> initial post. >> ᐧ >> While on site yesterday I did speak with Magnum's customer >> support about my findings and they advised to try to trickle charge the >> batteries up to the minimum threshold at which the Magnum inverters would >> turn back on. From there we will hopefully be able to run some more >> determinate tests. My question about the low-battery-cutout was more >> intended to explore whether others have ever experienced any similar issues >> with this protection feature. I am finding out that the feature is only >> relevant during inverting (not charging) mode and so would imply that the >> utility feed had been cut, which does not appear to be the case. >> - Our battery distributor has lent us a 12-circuit trickle charger - one set >> of alligator clips per battery. I am planning to re-visit the jobsite later >> today to put each battery on a trickle charge, which I am told will take 1-2 >> weeks for any lasting change to take effect. The distributor advised to >> reverse the leads on the batteries with negative voltage, hoping that they >> may be recoverable as "reversed pole" batteries thenceforth. >> >> -- >> Corey >> >> >> On Tue, Dec 16, 2014 at 8:27 PM, <cshalan...@joule-energy.com> wrote: >>> >>> >>> Wrenches, >>> >>> I visited a customer today whose grid-tied battery backup system suffered >>> some sort of catastrophic failure, and now I'm trying to play detective to >>> figure out what happened and whose equipment/design is to blame. >>> >>> Here is what I know so far: >>> - System is ac-coupled with a Sunny Boy 7000 (7.85kW array), Magnum >>> MS4448PAE (x2), 3 strings of 4 12v batts (705Ah total) >>> - Site visit was triggered by the Sunny Boy registering zero output via >>> online monitoring. >>> - SPST Solid state relay installed on Sunny Boy output, controlled via >>> Magnum router, serves as secondary overcharge protection to >>> Magnum's >>> frequency shift feature. Technician who initially responded claims he >>> measured 240v across the relay's terminals - relay manufacturer claims this >>> is "100% impossible". We removed the relay from the circuit, and the Sunny >>> Boy is again operational. >>> - On arrival I found the Magnum display showing a "Low Battery Charge" >>> message with the bank measuring ~4Vdc. The individual >>> batteries were in >>> various states of charge, ranging from high of 6.3v to low of -2.6v. These >>> measurements were taken at rest, all battery cables disconnected, and yes >>> three of the batts were registering a negative voltage. >>> - Customer reports that he was not aware of any recent prolonged power >>> outages. >>> >>> The three potential suspects would seem to be: >>> - SS relay: The customer is convinced that this is the weak link in the >>> system and somehow triggered this failure. I am not so convinced but would >>> be interested to hear recommendations for properly testing its >>> functionality. >>> - Magnum equipment: Since there is low-battery-cutout protection, why would >>> this feature not have activated and prevented the batteries from draining >>> so low? >>> - Batteries: I am not very familiar with modes of failure, but our >>> distributor suggested that an internal short could be a possibility - what >>> might have triggered this? >>> >>> Clearly I am fishing for potential leads here, so any suggestions are >>> welcome. >>> >>> Thanks! >>> -- >>> Corey Shalanski >>> Joule Energy >>> New Orleans, LA >> >> >> _______________________________________________ >> 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 >> > > _______________________________________________ > 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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