grid intertie [RE-wrenches]

[Don Loweburg, Offline]

In a message dated 12/01/2000 9:33:38 AM Pacific Standard Time, ipl at sover.net 
writes:

<< Wrenches,
    We will soon be adding a 60 Amp lockable disconnect to a 5kw PV array with
 (2) Trace SW4024's so the homeowner can sell into the utility grid.
    This is our first experience with net-metering so we are in need of some
 guidance on the proper settings of the inverters for Menu headings (17)
 BATTERY SELLING and (18) GRID USAGE TIMER.
     >>
David, In all the grid tied systems I've done, I keep it simple. Keep the 
trace defaults,except ,set the inverter mode to SEL. I know there has been a 
tremendous amount of discussion about reducing overhead with respect to 
floating the batteries. Honestly people create more problems with the arcane 
setup profiles I've heard. 
Since you don't want your charge controller cutting in you must set its 
control point above the Trace bulk set point. I like the Traces Float set 
point, but you might want to drop the bulk value and set its time to 10 min.
I advise my customers to test the system once a month by shutting the main 
off for an hour or so. This excercises the batteries and gives them a little 
gassing to keep thing from stratifying.
Hope this helps,  Best
Don

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