[RE-wrenches] RETURN AMP SETTING
Maverick Brown [Maverick Solar]
maverick at mavericksolar.com
Thu Jul 22 05:22:38 PDT 2010
boB
Time for you to design an RTS that also measures SG.
Then my Classic can:
Set Return Amps automatically.
Alert for an excursion in charge time
Alert for low water
Etc.
Thank you,
Maverick
Maverick Brown
BSEET, NABCEP Certified Solar PV Installer ®
President & CEO
Maverick Solar Enterprises, Inc.
Office: 512-919-4493
Cell: 512-460-9825
Sent from an iPhone.
On Jul 21, 2010, at 9:56 PM, boB Gudgel <boB at midnitesolar.com> wrote:
> 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
>
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>>
>> --- 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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