I have 2kw of grid tied PV on my house.
Suppose I:
- Open the main breaker to disconnect from the grid
- I open the PV breaker
- I connect a small good quality inverter like an Exeltech XP 500 to one
of the phases of the service (120 VAC)
- I put a small battery pack, 100 AH at 24 VDC on the inverter
OK so far, I could run some small loads for a relatively short period of
time before the batteries get low
-I have a PLC with an AD input and DA output. On the input I measure the
battery voltage, on the output I control a SCR. The SCR controls a 2kw
immersion heater sitting in a big bucket of water. The PLC has a scan
time of 2 mS and I program it to increase the duty cycle of the SCR as
voltage of the battery rises above 24 VDC.
OK so far nothing has really changed from above.
- I close the PV breaker, the GT inverters see the battery inverter,
sync and connect after five minutes.
Voila, I can run house loads from 0 to 2kw with my existing GT PV with
the balance of energy dumped as needed to the immersion heater.
Right?
Mark Frye
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