Questions about: solar

Sadly not much. 100W would not effectively heat a 40 gallon water heater, let alone an 80 gallon. Also, remember that the panel likely won't really put off 100W unless your element has the exact right resistance for your specific panel
You have the basic concept down. Your challenge will be sizing. What's the minimum possible load you can put on the system? For instance, don't use an inverter to run lighting
I'm not sure I completely understand what you mean by "twist. " You mention a 45 degree bend. Is that the bend of the elbow? Why was a "twist" required? At any rate, if it is holding, it will probably be fine under static loads even if installation w
I recently bought some used solar panels that are about 25 years old, because I got a great deal on them. They have some odd operating values, which is confusing me as to which solar charger will work with my system. I have 6 panels @ 230 watts each