Hello, I have 240W worth of solar panels, they are connected to my Epever PWM 30A charge controller (with thermal compensation) and then to my SLA truck 90AH battery (2 months old), the battery powers only my 12V led light bulbs, these are the night lights to my house.
I'm happy with my new battery, but oddly, I've noticed that on cloudy days the voltage after sunset is higher than on sunny days. I live in the southern hemisphere and it's summer here, very hot summer, 14 hours-a-day of scorching sun, my battery rises up to 35ºC every day and even today (a cloudy day) the temperature was high (32ºC max), the battery voltage goes up to 14,2V every morning (that's my conservative setting to avoid water loss) and then, after bulk and absorb stages, it floats at 13,7-13,5V depending on the CC thermal compensation. At sunset, in a sunny day, voltage remains at 12,7V and with the use of the lights goes down to 12,3V aprox. in a normal day, never goes below 12,2V. But today it was cloudy all day long, even a few drops of rain fell, temperature is not low (29ºC right now) and oddly the battery voltage remained at 13V after sunset, right now is on 12,9V. I have noticed the same behaviour on some other partially cloudy days but not as stronger than today that was cloudy all day long.
How come my battery seems to get "better" or "stronger" charge in cloudy days? any explanation? thank you in advance.
I'm happy with my new battery, but oddly, I've noticed that on cloudy days the voltage after sunset is higher than on sunny days. I live in the southern hemisphere and it's summer here, very hot summer, 14 hours-a-day of scorching sun, my battery rises up to 35ºC every day and even today (a cloudy day) the temperature was high (32ºC max), the battery voltage goes up to 14,2V every morning (that's my conservative setting to avoid water loss) and then, after bulk and absorb stages, it floats at 13,7-13,5V depending on the CC thermal compensation. At sunset, in a sunny day, voltage remains at 12,7V and with the use of the lights goes down to 12,3V aprox. in a normal day, never goes below 12,2V. But today it was cloudy all day long, even a few drops of rain fell, temperature is not low (29ºC right now) and oddly the battery voltage remained at 13V after sunset, right now is on 12,9V. I have noticed the same behaviour on some other partially cloudy days but not as stronger than today that was cloudy all day long.
How come my battery seems to get "better" or "stronger" charge in cloudy days? any explanation? thank you in advance.
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