GC-1000 blowing string fuses [RE-wrenches]

[Kirk Herander]

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Jim,

I've seen it happen also. In my situations it looked like the fuse holder had overheated - I do remember AES telling me they had a problem with cold solder joints on some of their fuse boards. Do the fuse ends look charred or brown? I recently had this happen on a Sunnyboy, BTW. A clip is made that holds the fuse ends tight in the fuse holder - this might help if poor contact is being made.

Kirk Herander
Vermont Solar Engineering
802.863.1202
fax 802.863-7908
NABCEP(tm) Certified Solar PV Installer
Xantrex Certified Dealer Charter Member
NYSERDA-eligible installer
VT Solar and Wind Partner


-----Original Message-----
From: Jim Grundy [mailto:eenergy33 at aol.com] 
Sent: Tuesday, September 06, 2005 5:21 PM
To: RE-wrenches at topica.com
Subject: GC-1000 blowing string fuses [RE-wrenches]

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Hello Wrenches,

    I have an AES GC-1000 that has been in the field operating with no 
trouble for about four years.  Recently, it started blowing the 10 amp string fuses. 
 It is connected to 8 Solarex MSX-120 modules.  The string current should 
never near the 10 amp fuse rating.  After replacing the blown fuse, and testing 
all PV and grid specs, the unit restarts and operates fine for a few more 
weeks.  I have not been able to see any correlation to temperature, high 
insolation, etc.

Any thoughts or similar experiences to share would be appreciated.

Thanks,

Jim Grundy
NABCEP Certified Solar PV Installer 
Elemental Energy
1750 Clark Rd
E. Montpelier, VT   05651
(802)-476-3441 P
(802)-476-5680 F
(802)-272-8933 C
EEnergy33 at aol.com

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