Solar cell equivalence ????

[rcastab]

I have a few small light weight solar cells rated at 0.5 volts and 0.3 amps at full sunlight and around room temp.

Assuming ideal conditions, full sunlight and ideal temperature for maximum efficiency.

If I have a motor system that uses nicads 7.2 volts and draws constant 2 amps, how many solar cells and what configuration (Series and parallel) would I need. Is the below correct, would it provide the same power assuming ideal conditions.
7.2/.5=14.4 round to 15
2/.3=6.7 round to 7

does this mean taking 15 solar cells and connect them in series
and then take 7 sets of these and connect then in parallel. Total of 105 solar cells. These cells total will probably weigh 2 oz.

Is my calculations correct?

[jlk]

Your math is correct. Fifteen cells wired in series, then seven of those wired in parallel. Now you know why Solar isn't popular.:D

Jordan

[Quacker]

Yeah, but look on the bright side (pun). You likely measured static amps. Your amps in flight would be much less (depending on prop pitch and airspeed). You might need fewer in parallel. Don't give up yet! Think of the flight times!

Q

[escapee]

Only 2 Oz? hmmm.
Do you plan to cover/protect them with something?
Are the cells part of the structure?
Does this weight include the wires & ~100 globs of solder & glue?
What did you estimate for battery cost?

Guess you don't plan aerobatics? :) ... well may be with lots of snow on the ground.

Good luck & post on it!