I am curious to learn about the technical side of solar power.
are there any electronics masters out there that could help answer my quesions?
I know the following:
V = I x R
P = I x V
where V is Voltage in Volts, I is current in Amps, R is Resistance in Ohms, and P is Power in Watts.
So using my notebook (the most power hungry device that I have) as an example of a device that I need charged, here are the power requirements (based on the output of the wall transformer/adapter/charger):
19 volts DC; 3.42 Amps; 65 Watts
So this all makes sense using P = I x R, 64.98W = 19V x 3.42A, and 19V = 3.42A x 5.556 Ohms.
So if I were to use a solar charger like this Silva Solar II 12 V charger, by my calculations (CORRECT ME IF I AM WRONG!) and using the following solar panels power specifications:
Voltage: 13.6 V
Power: 4.75 W
using P = I x V, and therefore I = P / V, 4.75 / 13.6 = 0.35A
So my assumptions are: based on good sunlight, one can output 0.35A;13.6V;4.75W per HOUR.
So if my notebook power requirements are 19 volts DC; 3.42 Amps; 65 Watts.
(Yet the battery says it has a rating of 11.1V;4A - giving a power rating of 11.1 x 4 = 44 Watts per HOUR)
then I assume that if I connected the solar panel to the notebook battery, that it would take
65/4.75 = maximum of 14 hours of good sunlight (65W is based on the wall charger rating)
44/4.75 = maximum of 10 hours of good sunlight (44W is based on the battery rating)
So in conclusion, my estimate is that it will take anywhere from 10 to 15 hours of direct sunlight to charge my notebook using the silva solar II 12V solar charging device. am I correct???
I wonder would this system work in a trickle charger manner??? i.e. slowly top up the battery over a period of time???
I am very interested to learn more on this subject so any/all replies would be great!