net metered system question [RE-wrenches]

Bill Brooks billbrooks7 at earthlink.net
Fri Mar 2 17:49:42 PST 2001


Allan,

On grid-connected systems I don't believe in going to Bulk. Since they can
absorb for an indefinite period, it's not necessary to go through that
process. After an outage at night, the inverter simply returns the system to
float voltage. It will take longer to go through absorbtion, but it does
away with the problem of the unit not dispatching to the grid during Bulk
charge. Since the timer is set to 0:00, it doesn't matter what you set it
to. I usually set it to 54 Volts like the float.

Bill.


> -----Original Message-----
> From: Allan Sindelar, Positive Energy, Inc.
> [mailto:allan at positivenergy.com]
> Sent: Friday, March 02, 2001 5:32 PM
> To: RE-wrenches at topica.com
> Subject: Re: net metered system question [RE-wrenches]
>
>
> Bill,
> I see where you're going.  But where do you set bulk then? Normal
> 58.8-59.2
> for battery care, with immediate drop to float? Also, I have been
> advised by
> Trace to set absorption duration off by 10 minutes with inverter pairs, so
> they don't fight each other (one inverter's charging causing the other to
> ramp back, in a loop logic). I suppose with absorption at 0 it's a moot
> issue?
> Thanks.
> Allan
>
> ----- Original Message -----
> From: "Bill Brooks" <billbrooks7 at earthlink.net>
> IMPORTANT setting point for SW inverters in grid-connected
> systems. Shut off
> > the bulk charge absorption time (set to 0:00) so that it will not bulk
> > charge every time you have an outage. If the grid is doing
> funny things in
> > your area, a 2:00 hour set time can keep the unit off all day long. Just
> set
> > the unit to float the battery at 54 volts (temperature compensated) all
> the
> > time. Make sure the PWM controller is set well above 54 (say 55.5V) and
> > temperature compensated to keep it from stealing power from the
> PV array.
>
>
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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.
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