Just completed installation of a Schneider Conext 6848 XW+ Pro inverter, and associated accessories.
It was initially to run the well pump and some other smaller loads.
Works great for that. Lots of extra capacity available.
We did an experiment to see how it would do running the entire house.
Turned off:
- WELL PUMP
- POOL PUMPS
- DRYER
- WASHER
- DISHWASHER
- HEAT PUMP
- WATER HEATER
Typical house load w/ the heavy loads disconnected is about 1500 watts.
Tried to start the heat pump, no luck.
The 6848 specs claim it will sustain a 12kw load for 30 seconds. (50A of 240vac)
That is more than enough to start the well pump, LRA = 41A.
The unmodified heat pump compressor LRA is 121A, far over the load rating tor the inverter.
However, I put a “Hard Start” kit on the heat pump compressor some years ago, as the 21kw Diesel generator was not happy starting the heat pump either.
Kit worked great, the generator can start & run the heat pump easily, after the modification to the heat pump.
I have no idea how many amps it takes to start the heat pump now, after the starting circuit modification.
But it requires less than the 87A from the genset, and more than the 50A capacity of the Schneider 6848 inverter.
So if I add a second Schneider 6848 to #1, (I think Schneider calls it cascading the inverters, of some such), there would be 100A of 240vac available, which would probably start the heat pump compressor easily.
Note that after the initial start spike, the heat pump compressor and air handler blower run @ about a total of 3kw.
What do you think of the idea to add a second inverter?
It was initially to run the well pump and some other smaller loads.
Works great for that. Lots of extra capacity available.
We did an experiment to see how it would do running the entire house.
Turned off:
- WELL PUMP
- POOL PUMPS
- DRYER
- WASHER
- DISHWASHER
- HEAT PUMP
- WATER HEATER
Typical house load w/ the heavy loads disconnected is about 1500 watts.
Tried to start the heat pump, no luck.
The 6848 specs claim it will sustain a 12kw load for 30 seconds. (50A of 240vac)
That is more than enough to start the well pump, LRA = 41A.
The unmodified heat pump compressor LRA is 121A, far over the load rating tor the inverter.
However, I put a “Hard Start” kit on the heat pump compressor some years ago, as the 21kw Diesel generator was not happy starting the heat pump either.
Kit worked great, the generator can start & run the heat pump easily, after the modification to the heat pump.
I have no idea how many amps it takes to start the heat pump now, after the starting circuit modification.
But it requires less than the 87A from the genset, and more than the 50A capacity of the Schneider 6848 inverter.
So if I add a second Schneider 6848 to #1, (I think Schneider calls it cascading the inverters, of some such), there would be 100A of 240vac available, which would probably start the heat pump compressor easily.
Note that after the initial start spike, the heat pump compressor and air handler blower run @ about a total of 3kw.
What do you think of the idea to add a second inverter?