STELR How to connect the STELR solar cells in series

STELR How to connect the STELR solar cells in series


Each of these solar cells is
independent they’re not connected to each other. If we want to get a bigger
voltage we need to connect these up in series one after the other. To connect
them in series I’m going to connect the negative of cell number one to the
positive of cell number two then the negative of cell number two to the
positive of cell number three and the negative of the cell number three to the
positive of cell number four. This time I’ll connect into the motor on the energy
testing station. I need to go from the positive of cell number one to one side
of the motor then connect the other side of the motor to the negative of cell
number four. I will adjust the lamp so that they’re spreading reasonably evenly
across. Now I’ll turn that off. Now it will be interesting to see what voltage we’re
getting from having our four cells connected in series. So I’ll take a
voltmeter, connect that across the motor and turn this around to two volts and
I’m getting about one point five five volts across that. So each of the
voltages from the solar cells around about point five is adding up to that.
If I disconnect the motor and just connect across the solar cells our
screen has gone to number one which means that it’s gone off scale. So I’ve
got to turn around to the next scale and without any load without any current
running through the solar cells I’m getting two point one three. Now if we want
to measure the power that we’re generating to go through that motor
we’ll need to bring in another meter to measure the current. So I’ll take out one
side of that put it into the common take another wire from the meter and connect
it across to the motor, that’s measuring current, so I’m going to put that around
to 200 milliamps and now to measure the
voltage across we’re now getting one point four seven volts and 66 milliamps.
We multiply those together we’ll get how much power we’ve got
in milliwatts.

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