net metered system question [RE-wrenches]

Steve Bell sebpv at stelle.net
Mon Mar 5 06:58:30 PST 2001


Hi David,

    Has anyone checked the voltage of the grid when these conditions occur?
I have had systems where all the set points seemed correct but it still
would disconnect from the grid intermittently. It turned out that the grid
voltage was climbing to about 136 volt which is outside the fixed
accreptable voltage range when in SELL.
It might be worth checking the grid voltage before you go crazy chasing set
points.

Sincerely,
Steve Bell
SunWize Technologies
sebpv at stelle.net

----- Original Message -----
From: "David Palumbo, Independent Power & Light" <ipl at sover.net>
>
> PROBLEM: It has been observed, on more than one occasion, (I have not
> re-visited the site yet so I have not personally checked things out yet,
but
> a very competent technical person was relaying the info to me via phone
> yesterday),
> that the pv charge controllers were controlling the pv current at float
> voltage,54v temp comp, when observed. The sunlight was strong at that time
> so the sell back that should have been occurring was not happening. After
> the grid sell back was set up (Dec 2000) we had observed good performance
on
> sunny days with the meter spinning backwards to the tune of 16 to 20 amps
at
> 120 volts on each SW4048.


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