[RE-wrenches] evergreen panels diode problems

[Marv Dargatz]

Jay,

Europe is ungrounded.  As a result, there are other requirements to 
detect leakage currents to earth at startup, and during operation.  You 
might wonder what happens if there's a ground fault.  Well, it is 
detected by the leakage current detection.  Interestingly, a ground 
fault on an ungrounded array does not cause an immediate problem so far 
as arcing, risk of fire, etc.  A second fault is required to cause major 
issues.  Strange how, here in the U.S. we put the first fault in place 
intentionally by grounding one of the DC conductors.

I'm not sure about Japan.

See Ya!

Marv
Enphase Energy
707 763-4784 x7016

jay peltz wrote:
> Hi Marv,
> 
> What do they do in Europe or japan?
> 
> How are they grounded, or are they grounded?
> 
> thanks,
> jay
> On Sep 21, 2008, at 11:17 AM, Marv Dargatz wrote:
> 
>> Mark,
>>
>> From an inverter manufacturer's standpoint there is a huge advantage 
>> in running positive ground in all installations.  Since the ground is 
>> provided through the GFDI circuit of the inverter, only one 
>> configuration of inverter must be stocked, and there is no need to 
>> provide field configurable ground connection.  This saves a SKU, a 
>> little bit of money, and confusion in the field.
>>
>>
>> See Ya!
>>
>> Marv
>> Enphase Energy
>> 707 763-4784 x7016
> 
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