Series fusing for string installations [RE-wrenches]

[Bob-O Schultze, Electron Connection]

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William,
Same with us up this-a-way if we run in metal. The combiner boxes I 
referred to mount on the end of power rail and are generally pretty 
accessible. All SS hardware included. A handy place to transition from 
the USE -2 of your MC cables to THW-2 etc. and bare CU ground to 
insulated. Ya gotta do that in some sort of box anyway. Yes, you'd have 
to get a ladder to check a fuse, but how often does that happen? The 
upside is just one set of conductors in a home run. Nothing fits EVERY 
application or installation, does it? You are braver than I am to 
tackle a barrel tile roof.
cheers, bob-O
On Aug 1, 2005, at 1:50 PM, William Miller wrote:
>
> Bob-O:
>
> In SLO county we are allowed to delete any roof-top disconnects if we 
> run metallic conduit.  All of our pitch roof PV installs have the 
> modules flat with the roof pitch, therefore no rack there to mount a 
> combiner to.  I do not like roof mount disconnects for a whole range 
> of reasons (get out the ladder to check fuses, extra hardware to 
> secure the disconnect to the roof, etc.).  This particular job is a 
> barrel tile roof anyway, so who wants to replace the tiles after you 
> access the fused combiner.
>
> WM
>
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>
>
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> At 01:22 PM 8/1/2005, you wrote:
>> Marco, William and all,
>> Another option would be to use a small rack mounted fused combiner 
>> box like Energy Outfitters sells in conjunction with a regular H361 
>> at the inverter or an inverter such as the Fronius or Xantrex which 
>> has the DC disco onboard. That way you've got just one set of 
>> conductors coming down from the roof. Once the big switch is open, 
>> the HV touch-safe fuse holders can be opened safely.
>> Bob-O
>
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