Power calculation problem

[vinvin92]

Hello,

so here I am doing my TPE 1S, and I ordered a photovoltaic cell sold on the econology store (this one: https://www.econologie.com/shop/cellule- ... p-111.html).

We made measurements on a sunny day, and we arrived at 200 mA and 2V so 0,4watt (maximum power).

It was measured that the size of the cell (the cell itself) was 42.75cm².

So from what I calculated, this cell produces 1440wh (it seems to me already huge), I found it by doing 0.4w * 3600 = 1440

And in the end, I think it produces 337kwh / m².

I find this result huge, does anyone see my mistake?

If you need clarification on my calculations, do not hesitate to ask me.

Thank you in advance

[dirk pitt]

Wh are an energy unit
as the unit shows, they are W x hours.
therefore if the cell in question provided 0.4W for 1hour, the energy supplied will be 0.4Wh
if it supplied this power of 0.4W for 4 hours it will have given an energy of 1.6Wh

he was not confusing power by m2 and
the energy per m2 per year or per hour or whatever you want but if it is an energy, there must be a time factor
in the absolute: of kwh / m2 does not mean anything if you do not specify on what duration this energy is produced

[vinvin92]

OK, thanks ! It's much clearer to me now.

My cell therefore produces 93wh / m²

A normal cell is 130 wh / m² with maximum sunlight.

So, it's good, I fall back on my feet now!

Thank you

[dirk pitt]

no 93wh / m2 means nothing if you do not say how long.
and besides it's not Wh but WATTS (power)

you have 0.4W snapshots on 42.75cm2 which gives 93W / m2 bar point

if you let it run at this power for 4h, you will have 93 * 4 = 372Wh / m2 on 4hours.