Hello Larry is always a good source. I have used Morningstar MPPT 60 s on my few LiFe po4 systems 4 years now, no controller problems or equipment problems yet. I imagine when the BMS disconnects battery voltage high, controller output goes high for a short period i will put an Egauge on the output to messure voltage on one system to see if i catch an event. Very good point
On Tue, Jan 8, 2019, 11:03 AM Starlight Solar Power Systems < la...@starlightsolar.com wrote: > There was some off board chatter about this subject but I think it is > useful to some to copy my comments on the board. > > If a Li battery EMS or BMS detects a fault condition, it can cause an open > circuit to the battery. As the battery owner gets familiar with their new > energy storage system, this will likely happen. If high current is flowing, > connected devices need to be able to handle that condition without harm. > > Morningstar notified us (about 4 year ago) that this event could cause > damage to their controller. That’s puzzling to me because OCV also happens > if your battery circuit protection opens. > > We mostly sell Midnite and Blue Sky Energy controllers with some Outback > in the mix. No failures have been reported to us. > > Larry Crutcher > Starlight Solar Power Systems > > > > > > On Jan 7, 2019, at 7:46 AM, d...@foxfire-energy.com > <d...@foxfire-energy.com> wrote: > > I've been asked to trouble shoot a problem with a new set of LiFePO4 > batteries on an older OB system.. The customer complained the system would > go dark within a few min. of the batt indicator light going yellow.. From > what I've gathered so far the BMS of the batteries is shutting down.. The > distributor sent out one of their techs, but it looks like they missed a > few adjustments.. The biggie is their CC (OB FM60) went into snooze mode > within a day of being connected to these guys, and now OB tells me the CC > lost it's FETs and that's pretty common with NiFePO4 BMS.. also when the > tech came out to commission the bank, one of the terminals on a battery > melted and another distorted.. the customer has a few more days to accept > the bank, I'm thinking send them back.. Comments? > > > Dan Brown > Foxfire Energy Corp. > Renewable Energy Systems > (802)-483-2564 > www.Foxfire-Energy.com <http://www.foxfire-energy.com/> > ______________________________________________ > _______________________________________________ > 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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