- Jan 7, 2017
Well, considering there is absolutely no information about the voltage of these panel strings, it's hard to say how many volts we're talking about here. I'm going to hazard a guess that these panels are "power grid" level and they are doing several *hundred* volts, not a poultry 48V (not saying that 48-60ish volts is safe, but no where near as dangerous as high voltage solar).Yes in fact this is why I have been banging on about dc circuit safety and what a big yawn it gets here from the couch colonels.
Here's an arc created with 1kV of power, and the arc is extinguished after a few inches of separation. He's only able to sustain the arc by slowly bringing his hands together when the arc is created. Otherwise the metal melts away and self extinguishes.
Here's another and this is 400V. Weaker than the other, but it's still 10x higher than a battery voltage string possibly creating an arc.
And here's the math behind knowing what the gap is:
Which is V=D(distance in cm)*30,000
Now, with Solar Panel installations, I definitely recommend using very high voltage rated and proper breakers. Don't use AC breakers for Solar, or DC in general tbh unless it's rated for such.
For a Battery installation, the DIY crowd is running somewhat low voltage, which is <70VDC. Again, they should use proper DC breakers for such voltage. I recommend with this, and with the solar installation, to use 2 breakers in series for extra safety. Even if the breaker(s) are rated for the voltages that are being supplied.
I really don't get where you are saying that we have a "big yawn" about safety. This doesn't make sense. No where have we stated that using cheap or inadequately rated equipment would be ok to do. Quite the contrary.
The biggest reason why there isn't much content about solar installations is because most of us don't even have high voltage solar installations to begin with. And those who do, have had it installed professionally and they came with the proper hardware to make it safe for the owner; which means they didn't post comments/threads about the installation and get help with information/installation procedures because some else did the installation, not them.