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, [email protected] 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/> ______________________________________________
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