IEEE PV Conference [RE-wrenches]

[Joel Davidson]

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Sounds good to me. Who else is staying at the Hilton?
Joel Davidson

-----Original Message-----
>From: Brad Albert <brad at risingsunsolar.com>
>Sent: May 7, 2006 7:41 PM
>To: RE-wrenches at topica.com
>Subject: Re: More on battery management [RE-wrenches]
>
>Your free subscription is supported by today's sponsor:
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>Take a 2-minute PC health check-up at no charge!
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>
>Aloha wrentches-
>
>If there are some of you who are attending the IEEE maybe we should all meet
>for a drink good to put the names with the faces I will be at the conference
>on the 9th-12th. Maybe we can meet at the hotel bar or somewherre either
>Tuesday the 9th or Thursday the 11th directly after the conference like 5pm.
>
>Let's hear a show of hands of who all is coming and when.
>
>Aloha-
>
>BA
>Brad Albert 
>Rising Sun Solar
>PO Box 790807
>Paia, HI 96779
>P (808) 579-8287
>F (808) 579-6369
>brad at risingsunsolar.com
>
>
>
>On 5/7/06 1:30 PM, "Joel Davidson" <joeldavidson at earthlink.net> wrote:
>
>> Your free subscription is supported by today's sponsor:
>> -------------------------------------------------------------------
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>> Repair corrupt files and harmful errors - protect your PC
>> Take a 2-minute PC health check-up at no charge!
>> http://click.topica.com/caaeKAPbz8QcsciZrxga/PC Powerscan
>> -------------------------------------------------------------------
>> 
>> Hi Windy,
>> 
>> I'm working on Sunday too, but I have a few minutes here at the Honolulu
>> airport waiting for the flight to Kona to attend the IEEE PV conference to get
>> my mental and physical batteries recharged. Working in PV sure beats other
>> kinds of work.
>> 
>> I like between 2.4 and 2.46 volts/cell for flooded lead antimony batteries
>> with a nice equalization charge every 2 to 4 months depending on system
>> configuration and use. Batteries and people thrive or die depending on how
>> their electro-chemical processes function. Batteries, like living things, need
>> special care and feeding in different situations. While anthropomorphizing
>> batteries may seem simplistic, the human/battery comparison is an
>> easy-to-understand way for users to think about the critters being fed by
>> their solar panels.
>> 
>> Aloha,
>> Joel Davidson
>> 
>> -----Original Message-----
>>> From: Windy Dankoff <windydankoff at mac.com>
>>> Sent: May 7, 2006 8:43 AM
>>> To: RE-wrenches at topica.com
>>> Subject: Re: More on battery management [RE-wrenches]
>>> 
>>> Your free subscription is supported by today's sponsor:
>>> -------------------------------------------------------------------
>>> Is your computer freezing up or slowing down?
>>> Repair corrupt files and harmful errors - protect your PC
>>> Take a 2-minute PC health check-up at no charge!
>>> http://click.topica.com/caaeKAPbz8Qcsbc0WJAa/PC Powerscan
>>> -------------------------------------------------------------------
>>> 
>>> Joel, Kelly,
>>> 
>>> The manual you refer to is written from the conventional assumption
>>> of 27/7 utility-supplied power to charge batteries. It is typical of
>>> the advice also given by battery manufacturers who are not
>>> specifically oriented to RE. Stand-alone RE charging requires
>>> different timing and voltage strategies.  Anyone who deals with
>>> batteries should have this manual (and similar information), but
>>> should understand that it does not fully address our situations.
>>> 
>>> We push the charging faster, in order to "get it while we can". Many
>>> flooded battery installations suffer from max. voltage set-points of
>>> about 14.2V because that's what the battery manufacturer recommended.
>>> That's fine when you have full charge power from a wall socket and
>>> can take a few extra hours to gently charge the batteries. In an RE
>>> system it must be 14.7 or 14.8V, or else the charge current is
>>> tapering off, and the battery is not fully absorbing the last hours
>>> of available sunlight. Or, it is  not charging as much as possible
>>> before the generator is turned off for the sake of peace and quiet or
>>> economy.
>>> 
>>> We push battery charging beyond the conventional comfort level that
>>> is optimum in a utility-charging scheme. This is a compromise, but it
>>> is MUCH more desirable than attaining a 75% charge by wasting
>>> precious solar power, on a day that it could have been pushed to 95%
>>> by delaying the voltage regulation.
>>> 
>>> Windy
>>> 
>>>> From: "Joel  Davidson" <joeldavidson at earthlink.net>
>>>> 
>>>> Hello Kelly,
>>>> The Battery Council International's Battery Service Manual is a
>>>> good info
>>>> source. Available at
>>>> http://www.batterycouncil.org/BCIServiceManualForm02.pdf or for
>>>> free from
>>>> many battery suppliers.
>>>> Joel Davidson
>>> 
>>> 
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>> 
>> 
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>> 
>
>
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