After scouring the forum for threads on this topic, I wasn't able to find a whole lot of information on PV construction although I am still very new to the forum and have yet to find out how to get around here 
My friend and I are building a lathe and we are planning to use it to build PVs. Initially we were planning to bore the battery casings and switch housing out of solid steel or aluminum rods although that probably wouldn't be the most efficient method. The primary goal is to make the PV as durable as possible by having a robust construction and by preventing any liquid from leaking into the switch. What other bells and whistles are sought after in PVs nowadays? I'm thinking that variable voltage, ranging from 3.7 volts to possibly 6 volts would be a benefit, as well as something digital, such as a battery strength meter or something of that sort. What do you guys think? Thanks in advance for any suggestions
My friend and I are building a lathe and we are planning to use it to build PVs. Initially we were planning to bore the battery casings and switch housing out of solid steel or aluminum rods although that probably wouldn't be the most efficient method. The primary goal is to make the PV as durable as possible by having a robust construction and by preventing any liquid from leaking into the switch. What other bells and whistles are sought after in PVs nowadays? I'm thinking that variable voltage, ranging from 3.7 volts to possibly 6 volts would be a benefit, as well as something digital, such as a battery strength meter or something of that sort. What do you guys think? Thanks in advance for any suggestions
