[RE-wrenches] OK, so what iwould happen if I do this...

[Mark Frye]

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