Forum Discussion

egarant's avatar
egarant
Nomad
Oct 24, 2014

Solar Charger Battery Temp Compensation

Hi,

I need some help, even my iPhone couldn't help me on this...

My Blue Sky Solar Boost 3000i has the temperature compensation factor of -5.00mV/degree C/cell.

My Lifeline manual reads a linear coefficient of 0.0022V/Cell Fahrenheit.

I have two 12 volt batteries hooked up in parallel.

I can manipulate my controller from -0.00 to -8.00 mV/degree Celsius per cell.

HELP...if you can
Truck Campers

4 Replies

  • egarant's avatar
    egarant
    Nomad
    Oct 24, 2014
    pianotuna wrote:
    Hi,

    Just convert the F to C. .22F becomes .396 C


    Which is darn close to the .4 that Lifeline suggested.

    Thanks for the confirmation!
  • tony_lee's avatar
    tony_lee
    Explorer
    Oct 24, 2014
    Those figures are near enough the same. degree C is 9/5 bigger than degree F

    5mv/C is 0.005V/deg C which is 5/9 x 0.005V/deg F = just a bit more than 0.0022V/deg F

    Small differences are usually overshadowed by other factors such as not measuring the battery temperature directly, or a controller with no external probe being mounted in a completely different ambient temperature to the batteries etc etc.
  • egarant's avatar
    egarant
    Nomad
    Oct 24, 2014
    I called Lifeline, they came up with .4 mV/per degree Celsius per cell.

    I left a message with Blue Sky energy, the solar controller mfg as all their tech's are at a conference until Monday.

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