I mean, do we really need Jupiter as is? Everything Jupiter has done for us with clearing out the trash from the solar system would have been done by a 2nd smaller sun as well.

Here we are, trying to improve solar cells to avoid global warming, and dissidents like you want to add a sun to the solar system.

It's not the solar system's fault that the inhabitants of one of the bodies in the system are bad stewards.

Also, if you have 30% effeciency from the light of one sun, wouldn't the additional light also improve the solar cell since there is now more light to get 30% out of? I mean, more is always better, right?

I know your comment is in jest, but in point of fact the additional heat from another star would almost certainly reduce the efficiency of the panels.

Can you explain why?

It'd be twice (>1<2) the energy

And I thought we were supposed to reduce global warming ;-)

There's something hilarious in adding a sun so you can improve the efficiency of your solar panels, so that you can switch to renewable energy and offset warming caused by your current single sun (and polution).