[RE-wrenches] RETURN AMP SETTING

Wed Jul 21 19:35:13 PDT 2010

That is a good question, I have not an answer, but of course it should be based on the amp hour of the battery bank, absorb charging voltage, and of course the charging source in the case of generators.  Following Ron's advise start at C/5 for SOC less than 50% then C/10 till about 70% SOC and then C/15 till 80% then C/20 to 90 %. the problem we have no way to set these values, Perhaps Ron could give is a routine?  The closet to SOC charging is the Outback and then the Magnum but both miss the goal.  

--- On Wed, 7/21/10, Dana <dana at solarwork.com> wrote:

From: Dana <dana at solarwork.com>
Subject: [RE-wrenches] RETURN AMP SETTING
To: "'RE-wrenches'" <re-wrenches at lists.re-wrenches.org>
Date: Wednesday, July 21, 2010, 5:54 PM

As the % of full charge is related to the of degree absorption
& gravity [the denser & more charged acid descending, and lighter acid rising]
@ what point in the absorption would be prudent to stop charging? 

I used to cut off the charge on the Trace SW series at 12 “return
amps”, VS. the factory default I think was at 5 amps.  This has &
continues to work well but I never had anyone really answer this function
clearly. 

Is there a battery manufacturer  or wrench that would
care to comment on the:   

The minimum “Return” amps to disconnect for a “full”
charge? 

OR 

The time required per 100 AHR after reaching the Absorption
point setting for the mix to occur? 

I realize that battery construction, battery condition, age
and temperature and the current power usage will also play into this factor and
it may not be a simple answer. 

 Dana Orzel 

Great Solar Works, Inc 

E - dana at solarwork.com 

V - 970.626.5253 

F - 970.626.4140 

C - 970.209.4076 

web - www.solarwork.com 

Responsible Technologies for Responsible People since
1988" 

From:
re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Mark
Frye

Sent: Wednesday, July 21, 2010 4:25 PM

To: Allan at positiveenergysolar.com; 'RE-wrenches'

Subject: Re: [RE-wrenches] Propane Generator, Dual Outback Inverters 

Allen, 

Can I infer that if you are
shutting off the gen before charge rates drop in absorption that you are
running only briefly in the absorb phase? Or do your charge currents remain
high through out an extended absortion phase? 

Perhaps you have plenty of PV
which you rely upon to bring the batteries up through the absorption phase,
once the gen is shut off. 

I would be interest to learn more
about your approach to this. 

Thanks, 

Mark Frye

Berkeley Solar
Electric Systems 

303 Redbud Way

Nevada
City,  CA 95959 

(530) 401-8024

www.berkeleysolar.com   

From:
re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Allan
Sindelar

Sent: Wednesday, July 21, 2010 3:17 PM

To: re-wrenches at lists.re-wrenches.org

Subject: Re: [RE-wrenches] Propane Generator, Dual Outback Inverters 

The Onan RS20000 shown in the generators article in HP
131 page 98 has performed flawlessly as backup support to an Outback quad-stack
of VFX3648s. Differences, however, are that this 20kW gennie charges four
inverters, rather than two; the elevation is 6,600 feet for about a 20% output
deration; there are no huge loads above charging draw; and the client is aware
enough to shut it off before absorption reduces the charge rate - all different
conditions than you have described, as the gennie is usually fully loaded and
running in balance.

Darryl is right about the amount of words necessary. 

Allan
Sindelar

Allan at positiveenergysolar.com

NABCEP Certified Photovoltaic Installer

EE98J Journeyman Electrician

Positive Energy, Inc.

3201 Calle Marie

Santa Fe, New Mexico 87507

505 424-1112

www.positiveenergysolar.com 

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