That sounds like something I've read somewhere.
It might even be in my manual. Not sure but it's got to be at least 150v..
When you are charging a 48v bank, your voltage has to be well over 50v.
Otherwise it will take too long to charge and the sun will be gone.
70volts seems to work pretty well for my needs.
A lot of people put their panels in parallel and just charge at 12v..
12v inverters are a lot more common than 48v inverters, is the main reason..
They have to buy a lot of thick copper wire. Big bucks.
But the other reason is the high voltage..
Be VERY careful with high DC voltage!
If you make a mistake, it's worse than being shocked by the AC mains..
It can kill you.. That's why firemen hate solar panels.. Even at night..
I heard one guy say the fire truck lights could make the panels live and shock the firemen.. Crazy..
Use a 10A fuse at the panels and it should never pop, even with a dead short..
It's just for looks mostly.. It will last forever.
A good solar forum is at
Solar Electric Power Discussion Forum by Northern Arizona Wind & Sun