Hi all,
First post here so please be gentle!
I've got 3x growatt spf5000 running a 3 phase system (off grid) with a diesel generator and eventually 15kw panels. About 20kWh of storage.
This is all to drive 2 milking robots, the load can change quite a bit, there is a large air compressor kicking in, 2x vac pumps and a cooling compressor so total load can get to near 15kw but not for long.
Cows milk 24/7 which is inconvenient for a solar system! When the generator is running obviously it has to charge the batteries (which can safely swallow the growatts full output @ 300A ) and run the load.
I can make it work by setting the utility charging current to say 20A per inverter but when there isn't such a high load this could be 100A. I think the saving in diesel and generator run time makes it worth trying to engineer a way to keep the generator loaded
Has anyone managed to get hold of the protocol (rs485 or can) that BMS use to control the charge current? I can program a micro controller to talk to it if I know what it needs to say!
Could then drop or raise the charge current depending on load.
Hope that makes sense
Thanks Geoff
Ps I've contacted growatt UK but am yet to hear back !
First post here so please be gentle!
I've got 3x growatt spf5000 running a 3 phase system (off grid) with a diesel generator and eventually 15kw panels. About 20kWh of storage.
This is all to drive 2 milking robots, the load can change quite a bit, there is a large air compressor kicking in, 2x vac pumps and a cooling compressor so total load can get to near 15kw but not for long.
Cows milk 24/7 which is inconvenient for a solar system! When the generator is running obviously it has to charge the batteries (which can safely swallow the growatts full output @ 300A ) and run the load.
I can make it work by setting the utility charging current to say 20A per inverter but when there isn't such a high load this could be 100A. I think the saving in diesel and generator run time makes it worth trying to engineer a way to keep the generator loaded
Has anyone managed to get hold of the protocol (rs485 or can) that BMS use to control the charge current? I can program a micro controller to talk to it if I know what it needs to say!
Could then drop or raise the charge current depending on load.
Hope that makes sense
Thanks Geoff
Ps I've contacted growatt UK but am yet to hear back !