June 26, 20205 yr Hi guys Installed to of the new Growcol inverters today (they're still pretty much a Growatt or Axpert underneath). They were swapped out for two existing Growatts, a BMV700 and Pi was installed to create comms from a Revov battery bank to the inverter (using ICC). When switching on (it was after dark already) everything seemed to come as normal, a few seconds later one the PV surge protectors blew. Then almost immediately after the AC breakers supplying the inverters tripped. Afterwards, trying to power each one up individually inverter 1 gives an error 09 (bus soft start failed I believe). Inverter 2 powers up normal but for some reason is feeding power back on the PV input. With no PV connected the voltage on the PV input keeps climbing. Any ideas?
June 27, 20205 yr 6 hours ago, Sammyigt said: trying to power each one up individually inverter 1 gives an error 09 (bus soft start failed I believe). Inverter 2 powers up normal but for some reason is feeding power back on the PV input. I assume that each Grocol has its own independent PVs? The high voltage SCC in Axperts is not isolated from AC out, so paralleling the PV inputs could cause big problems. If they are independent, it's hard to see how a failure in one could affect the other. When you measure the PV input, is that between PV input terminals? Each PV terminal will have a hazardous voltage with respect to earth, when loads are powered (from AC-in or from battery). Perhaps these new models still have some kinks to iron out.
June 27, 20205 yr Author Yes, each inverter runs with it's own independent panels. So they're not sharing at all. Even with no PV connected at all when the inverter powers up the voltage steadily increases on the PV terminals on the one inverter. With PV connected if the PV breaker is turned on it immediately blows the SPD on that string. As you mentioned though, I'm also struggling to understand how the one could cause any damage to the other (the one with the 09 error)? What really confuses me though is that this was a working system, all that happened was the Growatts were swapped out for the Growcol inverters.
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