EcoRenovator - View Single Post

Xringer · 11-11-10, 09:43 AM

Feedback from a bad battery charger is the only thing I can think of..
But, I'm not sure that's going to blow a fuse..

I've looked at a few 48v output solar chargers and IIRC, they all specified a PV input, that was higher than 48v..
My point being, if the PV & Battery voltages are similar, there isn't going to be a big rush of current to pop the fuse..

However, if you had a Buck-boost charger with low PV input and high DC out to the batteries.?.
Like if you had 14v of PV in and 48v on the batteries? And, the isolation diode failed (shorted),
with a shorted series transistor (or locked in the ON state)..

Yeah, that's a case where a fuse might save back-feed from getting out to your PV..
With that type setup, I would always use a fuse or breaker..

11-11-10, 09:43 AM	#8
Xringer Lex Parsimoniae Join Date: Feb 2009 Location: Woburn, MA Posts: 4,918 Thanks: 114 Thanked 250 Times in 230 Posts	Feedback from a bad battery charger is the only thing I can think of.. But, I'm not sure that's going to blow a fuse.. I've looked at a few 48v output solar chargers and IIRC, they all specified a PV input, that was higher than 48v.. My point being, if the PV & Battery voltages are similar, there isn't going to be a big rush of current to pop the fuse.. However, if you had a Buck-boost charger with low PV input and high DC out to the batteries.?. Like if you had 14v of PV in and 48v on the batteries? And, the isolation diode failed (shorted), with a shorted series transistor (or locked in the ON state).. Yeah, that's a case where a fuse might save back-feed from getting out to your PV.. With that type setup, I would always use a fuse or breaker..