[RE-wrenches] SunPower SunVault black start

[Bruce Erickson]

Recently one of our four now-orphaned SunVault systems failed to back up for our customer. On site we found the batteries discharged below cut-in voltage for unknown reasons (no more monitoring, no more tech support). Even though it had been sunny for a few days the system failed to retain a reserve to restart once sun returned. I’m looking for recommendations for 48 volt external chargers for this situation. We’re looking at Iota which only has a 13 amp charger at 48v but does have a plug-in module for controlling LiFePo charging. At 256 amphours of parallel batteries hopefully an 8 or 10 hour charge would get us up to cut-in. I’m also not sure how the Iota will play with any BMS the SunPower batteries might have. Any recommendations for this situation would be much appreciated.

Thanks in advance,
Bruce

Bruce Erickson
Mendocino Solar Service
707-937-1701 
PO Box 1252
Mendocino, CA 95460
 


"Serving the Solar System"





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