Dear Wrenches:
I have a customer with a SMA SB2500U exhibiting the vac-bfr error code. I believe this indicates a grid voltage out of tolerance. The inverter has correct grid voltage and frequency to the grid terminals and is a model that does not include the fuse. This inverter is on longer supported so I can’t get a repair. I have previously changed out the firmware and used the reset sequence. I tried resetting the inverter by cycling power for several minutes and using the ENS1/ENS2 procedure. No change in status. Does anyone happen to know of any other method to reset this inverter? Otherwise it becomes a boat anchor. Thanks, William [image: Gradient Cap_mini] Lic 773985 millersolar.com <http://www.millersolar.com/> 805-438-5600
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