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dave-hartley asked

SmartSolar - Why does my battery voltage go above my Absorption value

Hi Newbie here, please be gentle :-)

My setup is a smart solar 100/50 12v

  • connected to a bank of 4, Gel Lead acid 110AH
  • 2x 410W panels
  • Narrowboat
  • Engine not running ( not alternator input)

I am trying to understand why the battery voltage is not clamped at the absorption voltage value as set in the app settings ( see picture) 14.4v.

How is the absolute maximum output voltage set on this controller

Many thanks in advance for any thoughts


ss1.jpg


ss2.jpg

smart solar set-up help
ss1.jpg (117.2 KiB)
ss2.jpg (82.0 KiB)
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Alexandra avatar image Alexandra ♦ commented ·
@Dave Hartley

Check temperature compensation.

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dave-hartley avatar image dave-hartley Alexandra ♦ commented ·
Thanks Alexandra.

I failed to mention I have a Smart Battery Sense fitted and connected to the SmartSolar.The temperature got up to 18c yesterday in the batter compartment.

Will higher temps raise the voltage delivered?

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nickdb avatar image nickdb ♦♦ dave-hartley commented ·
25C is the base temp, for each degree below this it will raise charge voltages by the value it is set to. Once above 25C, it will reduce the charge voltages.
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2 Answers
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dave-hartley answered ·

Sorry I was wrong, those charts are for days when no engine was running and the battery box was about 8-9c

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klim8skeptic avatar image klim8skeptic ♦ commented ·

@Dave Hartley do the math.

-(temp difference from 25c) X -(temp compensation volt value for battery)

That will give you the amount of variance from programmed set absorp volt value.

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dave-hartley answered ·

Thanks both for a simple explanation

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