I noticed that in the night time (dark) the voltage measurement on the battery was lower than in the day time (sun), measured with my voltmeter. I'm new to electricity, but that made me assume it had lost charge.
Voltage in the day in bright sun: 12.56V
Voltage early the next morning: 12.42V
Did I lose charge over night by leaving it clamped?
I'm using a 12v solar trickle maintainer on a 12V sports-bike battery. I am trying to charge it up over several days, and don't want the voltage to drop. The instructions said the battery is done when it reaches 12.7V... I assume it'll take like 5 days.