Who was the inverter manufacturer? Please respond off list, I just had to ask.
I would have sent it off list but it came as a bounced message. Thanks, Bob From: [email protected] [mailto:[email protected]] On Behalf Of Kurt Albershardt Sent: Sunday, May 16, 2010 6:14 PM To: RE-wrenches Subject: Re: [RE-wrenches] AC breakers used in DC applications Voltage is not the issue here, it is current, and battery fault currents can be staggering - far more than one would ever encounter in a typical AC system fed from a distribution transformer. I have seen a 200A Class T fail to act on an 48V inverter fault which resulted in welding the metal tabs of the fuse holder (which had been greased with copper-laden Penetrox E) to their sockets. That indicates a fault current well north of 200,000 amps, quite possibly sseveral times that. A fire ensued, which triggered the gas protection system and fortunately resulted in almost no peripheral damage. It did cost about $10k to recharge and recertify the Inergen system. The inverter manufacturer was quite cagey on warranty replacement until they saw the photos - at which point a replacement miraculously arrived by overnight air. On May 15, 2010, at 9:43 , Drake Chamberlin wrote: I did see a QO breaker fail to trip on a 24 volt DC system with only battery voltage behind it. It burned a #12 wire completely in two. The 48v is a max rating not a nominal rating. So yes only good for 12 and 24v systems. However with CBI breakers I don't understand why the need for QO for DC anymore? jay peltz power On May 15, 2010, at 6:28 AM, Rebekah Hren wrote: Drake Chamberlin Athens Electric OH License 44810 CO License 3773 NABCEP TM Certified PV Installer Office - 740-448-7328 Mobile - 740-856-9648
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