[DonRotolo]

Jeff, you also asked "what happens to the voltage", in the cases described it gets lost, as heat.

For the solar cells, with 7 cells you would get just a hair above 1.5 volts, because the 4th cell would be reverse-biased and essentially a short circuit.

Note that most real cell arrays (not raw individual cells) have blocking diodes to prevent that.

I suggest that you try your experiment just like a physics lab: form a hypothesis (guess what will happen), do the experiment, and try to explain what you observed. Do note that open circuit voltage may be 0.5 volts, short-circuit current may be 6 Amps, but in a real circuit neither will be that.

Oh, and a solar cell outputs AMPS, not Amp-Hours. Batteries are rated in Amp-Hours. The correct units are important.

Don