Just a Quick update with my Parallel PIPs. All good
After the inverters are wired and set to Parallel mode, which ever inverter is turned on first becomes the Master, once the master is active and the Slave is turned on it takes about 8 seconds to come on line and share the load.
If the Slave is turned off the AC output stops straight away and the inverter takes about 15 seconds to shut down.
Once both inverters are switched on they stay on and they draw about 1/2 Amp each on no load or 25 watts each.
What I have done is change the jumpers on the comms board so I lose the Gen start feature on the Slave inverter and it becomes a remote on/off switch. I wired to the N.C./N.O. terminals. Note there is battery voltage 48v on the on/off switch and remote terminals.
I have mounted a digital current switch (a current sensing relay with an adjustable set point)and run the inverter output active wires thru its toroid pickup. I have the setpoint at about 2300 watts and the slave inverter then switches on. This can be over ridden by the normal on switch but it would need an extra switch in the current switch line to over ride the off,(I will do that). I am happy to report it works nicely.
I was thinking in a year or so I will reverse the Master/slave and share the Hours around
One hiccup I had,
I had each inverter AC output wired to a separate breaker.
on testing I had the Master inverter breaker closed and the Slave breaker open and both fired up OK but when I switched on a load (the Dryer) both inverters went into fault.
Both inverter AC outputs need to be wired together thru a single larger Breaker.