Combining SQFlex PV direct with grid tie [RE-wrenches]

[Brad Bassett]

Kurt,

You can use the Grundfos I/O 101 in the pump circuit and when grid is up 
the pv will feed the grid tie inverter and the pump will run on AC. When 
the grid it down the I/O 101 will automatically switch the pump to the 
pv. The trick is getting the voltages in range for both. The lower range 
for the SMA 1100 will work but that is a discontinued model, some around 
still. The 700 will work but will limit which modules you can use, and 
the 2kW range inverters will make it harder to keep the voltage low 
enough.  The max on the SQFlex is 300vDC and you should take into 
account the voltage rise at low temps. Also keep in mind that the I/O 
101 is only good for 120vAC, not 240.

Thanks,
Brad Bassett
AEE




Brad Bassett


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