[RE-wrenches] RETURN AMP SETTING
boB Gudgel
boB at midnitesolar.com
Wed Jul 21 19:56:28 PDT 2010
Darryl Thayer wrote:
> 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.
>
I would also be interested to hear Ron's answer to this, but I would
think that if you measure the current and Specific Gravity
together, during absorption , when the proper fully charged SG
specification is reached, you would have your RA answer.
Or, darn near close to it.
boB
>
> --- 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 <http://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_
> </mc/compose?to=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_ <http://www.positiveenergysolar.com/>
>
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