Selling tactic for MPPT [RE-wrenches]

[William Korthof]

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Isn't the DC rating on the QO circuit breakers at something
like 5,000 or 10,000 amps interrupting current. Just because
the OCV of the panels is 80 or 120 VDC, I don't see what
relevance that has to the interrupting capacity of the breaker.
At OCV, by definition, there is NO current. The battery
would be the principal source of significant fault current.
At 5,000 amps current out of the battery pack, the source
voltage at fault is obviously going to be lower... well below
array voltage, probably well below 52 or 48 volts. With
battery resistance and wire losses considered, I suspect
that the max fault current at an array combiner for most
PV/battery systems would be below 5,000 amps.

Shouldn't that be a factor?
Am I missing something?

/wk

At 12:01 PM 8/9/2004, Bob-O Schultze, Electron Connection wrote:


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>Gang,
>Four 12V PVs in series-especially running into a MPPT controller, will 
>pretty easily push the incoming voltage over the 48VDC rating of the QOs. 
>Probably still work fine, but....
>Bob-O
>
>
>>  Assuming they're Siemens M50 modules, the
>>manufacturer's  literature
>>>clearly shows daisy chaining up to 4 modules. Then I would bring  the 2
>>circuits into a 2 pole QO
>>  >box indoors with 2 15 A breakers.
>
>--
>Bob-O Schultze, Electron Connection
>PO Box 203, Hornbrook, CA 96044
>800.945.7587 or 530.475.3402
>fax 530-475-3401
>www.electronconnection.com
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