net metered system question [RE-wrenches]

[jberdner at sma-america.com]

Dear David:

I am on vacation in Alaska so I don't have a Pulse manual with me.
I think that the factory set points are enabled and so the Pulse controller
is going into a lower float setting.
You want to select the user set points and then adjust the both the Bulk and
float pots to the same level.
The level should be above the sell back level so that the PSC 500 does not
limit the current when the inverter is selling back.

I remember that there was a problem with the factory/user switch settings in
the manual.
In one of the versions it was backwards to what it really was in the
hardware.
Double check by setting the bulk and or float level and then adjusting the
pots.
The battery voltage should change as you move the pot.

Best Regards,

John Berdner

-----Original Message-----
From: David Palumbo, Independent Power & Light [mailto:ipl at sover.net]
Sent: Monday, March 05, 2001 9:04 AM
To: RE-wrenches at topica.com
Subject: RE: net metered system question [RE-wrenches]







	<<If all of your SW setup values are actually where they belong, and the
charge controller is operating properly (above the SW bulk voltage), then
you probably have MOSFET damage in the inverters. The inverters will
produce output that seems "normal", but they won't feed back the grid. Your
best bet here is to look at the wave form on an oscilloscope, if possible.
	This was the situation with my SW 2512, it would connect to the grid and
*act* like it was feeding the utility, but the batteries would boil away at
15+ volts (there's no other charge controller in my system). The inverter
would power loads from the batteries in a seemingly normal manner. When I
took apart the cabinet, I found four fried MOSFET's, all connected to one
of the three transformers. The result of this failure was that the inverter
could meet the voltage of the grid, but not exceed it enough to cause
current to flow back unto the utility. No error indications were noted on
the front panel, or in the faults menu.
	Time to exercise your (entended?) warranty.>>

Sharkey et all,
	After I posted my original message the wrench on site got the system to
sell back several amps (late afternoon) on each inverter by adjusting the
charge controller float setting upwards. So it looks like the Pulse
controller was holding back on pv amps. Now I have to figure out why.
	We would appreciate any other suggestions.

David Palumbo
IP&L


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Hosted by Home Power magazine: 
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For info contact list moderator by email:
 michael.welch at homepower.com

____________________________________________________________
T O P I C A  -- Learn More. Surf Less. 
Newsletters, Tips and Discussions on Topics You Choose.
http://www.topica.com/partner/tag01