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mtadao avatar image

Battery reading on mppt 75 /15

I am just wondering when the minimum battery voltage reading is taken because when going to sleep and all loads off, the controller shows say 12.40. On checking up the following morning at 7 o'clock, the minimum shows a higher figure say 12.57. What happened?

battery system voltage
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JohnC avatar image
JohnC answered ·

Hi. As I understand it, your mppt has it's own internal clock, not in real time, but 'mppt time'. It knows when the sun went down, and has a fair idea from history when it's likely to rise. So sometime during the night it will determine a 'mppt midnight' and reset itself.

This could confuse things if you (say) parked a camper in a dark shed for a month, then look at it's history for 'yesterday'. And the previous solar day it saw was a month ago.. :)

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