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senna1976 avatar image
senna1976 asked

Battery Voltage set to 14.35 but Smart Solar 100/20 is charging with up to 14.9V!!!???

Hi Ladies & Gents,


today I realised that my SmartSolar is charging my battery with up to 14.9V even if I have set the limit to 14.35. It worked very accurate since I installed the SmartSolar 100/20. At the moment I'm testing the charger before I connect Li-Ion batteries to it to make sure I stay away from the Voltage limits of the batteries for safety reasons. But having more then 0.5V overvoltage during charging worries me quite a lot! What could be the reason for that and how can I get this under control?


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Alexandra avatar image
Alexandra answered ·
@senna1976

Temperature compensation?

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senna1976 avatar image senna1976 commented ·
Hi Alexandra,


could be. So I guess the value I set (i. e. 13.5V) is probably @ 20°C. My compensation I haven't touched and it is -16.2mV/°C. Does it mean when the temp goes down I increase the voltage?

For example: @ 10°C results then in in a 162mV higher chargin voltage (13,662V)

And ultimately if I don't want to increase the charging voltage I set the compensation to 0?


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kevgermany avatar image kevgermany ♦♦ senna1976 commented ·

25C, not 20C.

But this is for lead batteries. With lithium it should be zero.

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senna1976 avatar image senna1976 commented ·
I guess you're right. The last few days were pretty cold compared to the previous one. I just found the topic in the manual.


Thanks for the hint.

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