[RE-wrenches] Fwd: Grounding on a glacier, SunPower modules

[boB Gudgel]

Larry Crutcher, Starlight Solar wrote:
> I meant to type ...NO noticeable loss of power.

Hi Larry....   But how do you ~really~ know you weren't losing power 
because of their lower efficiency unless there was
a comparison made ?  :)     I'm not sure that I believe it's all that 
much of a problem, either.

But seriously, I think that  what Sunpower ~really~ means is that they 
have a problem with their lower efficiency on high voltage strings.
I don't imagine that an RV installation would be that high of voltage ? 

I would just like Sunpower to explain this all a bit better.

boB




>
>
> On Jul 23, 2009, at 7:27 PM, Larry Crutcher, Starlight Solar wrote:
>
>> I have installed tons of SunPower 90's without any ground connection 
>> on RV's with noticeable loss of power. I believe the problem only 
>> occurs when you have a path to ground from the frame.
>>
>> Larry
>>
>> On Jul 23, 2009, at 12:58 PM, boB Gudgel wrote:
>>
>>> Larry Crutcher, Starlight Solar wrote:
>>>> Hi Jay,
>>>>
>>>> An interesting quandary indeed.
>>>
>>> This is another good example of an application that I was trying to 
>>> grill Sunpower about --- as far as grounding their modules that need 
>>> to be positive grounded
>>> in order to take advantage of their higher efficiencies.   They 
>>> couldn't answer this simple question.  How would you use one in an 
>>> airplanefor instance ?
>>> There are solar powered airplanes (sort  of)   Is a large faraday 
>>> shield enough ?   Sort of like the ground radials that Larry has 
>>> mentioned.  I would
>>> imagine that if you get large enough radials that it ~might~ 
>>> approach being a virtual ground. Works for antennas though.
>>>
>>> I like questions like this one.  Sure makes one think a bit.
>>>
>>> boB
>>>
>>>
>>>
>>>
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