I've been noticing lately that my house batteries have been getting charged up faster than normal, and since I've experienced this phenomenon before I had an idea about what could be causing this. I opened up the drapes, looked outside and sure enough my idea was correct. The sun was definitely higher in the sky than it was before.
This is always a welcome sight for two reasons. First the sun is hitting my solar panels at less of an angle so they're producing more amps every hour than in the dead of winter. But more importantly it signals that Spring is on the way, the worst of winter is over, and Summer is just over the horizon.
Speaking of sun on the solar panels, today was another windy day and the sky was 80 or 90 percent cloudy, and yet my batteries were fully charged before lunch. I attribute this phenomenon to my lithium iron batteries which can take as much amperage as you can give them, unlike lead acid batteries which go through stages where they have to accept amperage slowly.
So when the sun would come out of the clouds for a few minutes the batteries can take as many amps as the solar panels are able to produce so the batteries ended up being quickly and fully charged on a day that looked cloudy enough that it was going to be a problem.