IEEE PV Conference [RE-wrenches]

Tue May 9 10:31:53 PDT 2006

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Call me on my cell 808-268-9753. I may not get internet often. I am staying
in Kona.

BA

On 5/7/06 10:04 PM, "Joel Davidson" <joeldavidson at earthlink.net> wrote:

> Your free subscription is supported by today's sponsor:
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> 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/caaeKAPbz8QcsciZrxga/PC Powerscan
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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:
>> -------------------------------------------------------------------
>> 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
>> -------------------------------------------------------------------
>> 
>> 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:
>>> -------------------------------------------------------------------
>>> 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/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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