PV combiner box protection [RE-wrenches]

[Todd Cory, Mt. Shasta Energy Services]

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This post makes me wonder why the manufacturers do not put series current
limiting fuses inside the J-box on the back of the PV?

Todd


Darryl Thayer wrote:

> Hi All and Kurt
> The module has a max fuse or breaker rating, this must
> be followed.  We have all heard of the few fires that
> were caused by a panel short circuit and all the
> balance of the array dumping there energy into the
> shorted module.  So the Module must be protected from
> overcurrent, hence the UL maximum current/fuse/breaker
> rating.
>
> By code this is a maximum parallel or series
> fuse/breaker or a supplementary fuse in each panel.
>
> And the bringing of perhaps 8 parallel sets of wires
> down to the controllers/inverters leads to the single
> motion of the hand switch that I fought with for so
> long.  (in my case 16 breakers at the enterance to the
> building)
>
> Thanks daryl
>

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