Sarahps33 wrote:
For example my laptop says 20v/2.25a on the charger.
And I'd turn it into 12v DC - giving me the amp draw.
In the case of my laptop it was converted to 4.14a
I took those amps and multiplied it by how many hours a day I would use it.
The most I'd ever use it in one day would likely be 7hrs.
4.14a x 7hrs = 28.98a
So that tells me how many amps I'd use from that laptop a day, right? Am I doing it right so far? Lol.
Not quite.
To do a direct comparison you need to calculate watts. For example, the laptop is 20v/2.25a = 45 watts.
45w/12.5v= 3.6 amps. Not sure where the 4.14 came from.
Try doing it that way. And if you use 3.6 amps for one hour, that's called "3.6 amp hours", not "amps" and not "amps per hour." If your laptop takes 3.6 amps, it's taking 3.6 amps *continuously* to run.
A 60a solar controller would allow a charge rate of 60a, however, having enough panels to do that is another story.
