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Old 09-28-2017, 07:35 AM   #28
foggysail's Avatar
City: Ashland, MA
Country: United States
Vessel Model: 1990 Silverton 40 aftcabin
Join Date: Jul 2016
Posts: 912
Bruce-- What battery voltages are you charging with PWM controllers? Most likely your's are 12 or 24v which means the panel voltage you are exposed to is safe. But not all installations have safe voltages.

I installed a battery switch for my panels back when I used panels with Vmp of 18V for a PWM controller. Now however, my new installation panels have Vmp of 32V wired as two banks of series/parallel that provide voltages upwards to 70-75V to my controller. Anything greater than about 48V is dangerous and of course even lower voltages can do great harm it shorted out with a ring or a watch.
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