net metered system question [RE-wrenches]
Bill Brooks
billbrooks7 at earthlink.net
Tue Mar 6 20:49:28 PST 2001
Not wanting to mix it up here, but I was referring to grid-connected
applications. A very different story from off grid on how the batteries, and
inverter operation works. Can't make a blanket statement, but my comment was
in light of AGM batteries as the optimum for on-grid systems. I stand by my
comments.
Bill.
-----Original Message-----
From: sunwise at cheqnet.net [mailto:sunwise at cheqnet.net]
Sent: Tuesday, March 06, 2001 8:22 PM
To: RE-wrenches at topica.com
Subject: Re: net metered system question [RE-wrenches]
Bill Brooks wrote:
>
> 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.
Hey Bill,
I want to respectfully disagree with you hear. I don't know if this
issue has been responded to, as I hven't been able to work my way
through all my email (and some well go unread). I have read a number of
posts essentially saying that the efficiency of an SW can be improved by
changing a number of default settings under the battery charging menue.
I believe doing away with the bulk charge and absorbtion could greatly
impact battery life. Althought the Trace will not initiate a charge
cycle after an overnight period of darkness (not sure what you ment by
overnight outage), it will initate a charge cycle after any power loss
to AC1 (utility down or cycle power at the breaker). If there is a
power outage, and some of the battery is consumed, I believe simply
bringing voltage back up to a float setting is inadequate. I have even
told some clients with a grid tied SW to cycle power to the inverter
(turn AC1 breaker off for ten seconds) every time they change the angle
on their seasonally adjustable array. Gives the battery a nice shot.
The bigger issue with the SW is the silent sell. There is no easy
answer to the battery baby-sitting SW -- Kurt Nelson
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For info contact list moderator by email:
michael.welch at homepower.com
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