Good Morning Greg
I can't spend all day here so just one little question for you today.
In the lovely photograph of your Suncube MK4
Suncube Mk 4

What is the purpose of the pack of lantern batteries at the base of your Suncube. Is it not supposed to work off streetlights or starlight as you have claimed?
If that is a WORKING suncube then it should have some output cables.
Driving a light globe would be nice.
A wattmeter would be nicer.

Keef
(a skeptic and proud of it)