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Forum index » Science and Technology » Chem » Electrochem » Battery
Solar charging in wide temperature range
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mumuusa@gmail.com
science forum beginner


Joined: 19 Sep 2005
Posts: 14

PostPosted: Sun Jun 11, 2006 12:22 pm    Post subject: Re: Solar charging in wide temperature range Reply with quote

Temperature compensating the voltage is a safer method to charge the
batteries. However, you will still have the same issue of lower
capacity at lower temperatures. If you are operating in the lower
temperatures then you might consider adding batteries in parallel. You
can also try to insulate the batteries. Good luck.

MuMu Moorthi
www.battery-consulting.com


Bill Darden wrote:
Quote:
On 7 Jun 2006 12:56:13 -0700, "Evan" <evangarich@gmail.com> wrote:

I am planning on continuously trickle charging batteries with a solar
panel. Temperatures will vary widely, with temps less than 0ºC
likely. I am new to this, but from the information I have been able to
gather, NiMH would not charge properly at such a low temp. Is this
correct? Would a lead gell cell be an appropriate choice? Thanks for
your help,

Evan

Hi Evan,

Here is a temperature compensation table at 2.8mv/degree F/cell for
constant voltage charging of lead-acid batteries:

http://www.uuhome.de/william.darden/carfaq9.htm#temp

However, it is best you use your battery manufacturer's recommended
temperature compensated charging voltages; which means using a "smart"
temperature compensating charge controller that is best matched to
those voltages for optimum battery service life.

Kindest regards,

BiLL.......
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Bill Darden
science forum beginner


Joined: 04 Dec 2005
Posts: 10

PostPosted: Sun Jun 11, 2006 6:10 am    Post subject: Re: Solar charging in wide temperature range Reply with quote

On 7 Jun 2006 12:56:13 -0700, "Evan" <evangarich@gmail.com> wrote:

Quote:
I am planning on continuously trickle charging batteries with a solar
panel. Temperatures will vary widely, with temps less than 0ºC
likely. I am new to this, but from the information I have been able to
gather, NiMH would not charge properly at such a low temp. Is this
correct? Would a lead gell cell be an appropriate choice? Thanks for
your help,

Evan

Hi Evan,

Here is a temperature compensation table at 2.8mv/degree F/cell for
constant voltage charging of lead-acid batteries:

http://www.uuhome.de/william.darden/carfaq9.htm#temp

However, it is best you use your battery manufacturer's recommended
temperature compensated charging voltages; which means using a "smart"
temperature compensating charge controller that is best matched to
those voltages for optimum battery service life.

Kindest regards,

BiLL.......
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Evan
science forum beginner


Joined: 11 May 2005
Posts: 5

PostPosted: Wed Jun 07, 2006 7:56 pm    Post subject: Solar charging in wide temperature range Reply with quote

I am planning on continuously trickle charging batteries with a solar
panel. Temperatures will vary widely, with temps less than 0ºC
likely. I am new to this, but from the information I have been able to
gather, NiMH would not charge properly at such a low temp. Is this
correct? Would a lead gell cell be an appropriate choice? Thanks for
your help,

Evan
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