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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