Re: [RE-wrenches] RV solar with SunPower

2018-01-20 Thread Dave Angelini Offgrid Solar 
Definitely agree! The E series is fine ! I run strings of 6 or 7 all the
time negative ground GFCI. Best panel in the world with Panasonic and LG a
close second! --Dave


> A number of years ago SunPower switched to using a new cell that does NOT
> require positive grounding.
>
> So there should be no problem in using that 327 as described.
>
> Marco
>
> On Saturday, January 20, 2018, Mac Lewis  wrote:
>
>> Hi Wrenches,
>>
>> I have a buddy that would like to use a leftover SunPower E20-327-C-AC,
>> panel on his RV.  Obviously he would need to take the inverter off.
>> What
>> I'm not sure of is if this panel can operate in an ungrounded
>> configuration, or negative ground or does this still need a positive
>> ground?  If it does need a positive ground, are there any decent MPPT
>> charge controllers that are fully isolated from PV to battery side, that
>> would allow PV + ground and Battery - ground?
>>
>> Thanks
>>
>> --
>>
>>
>>
>> Mac Lewis
>>
>> *"Yo solo sé que no sé nada." -Sócrates*
>>
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Dave Angelini Offgrid Solar
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text 209 813 0060

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Re: [RE-wrenches] RV solar with SunPower

2018-01-20 Thread jay 
HI Mac,

Sunpower used to have a white paper that showed positive ground was only needed 
above a certain voltage.  Like 200v+ from memory.

I don’t know if these particular modules would fall into that category.

jay

peltz power

> On Jan 20, 2018, at 9:59 AM, Jerry Shafer  wrote:
> 
> Mac
> I have used the sunpower 318 on trailers with the outback charge controller 
> FM-60, which was wired for positive ground. However this was the only power 
> on board, did not have any issues when connected to the truck or via the 
> outback PS 2 except when I connected the laptop to the Mate 3 and had it 
> plugged it to the inverter power, this would pop the GFI, I used an optical 
> interface to prevent this from happening. I will say the Outback is more 
> expensive then the panel so it may not be worth it.
> Jerry
> 
> On Sat, Jan 20, 2018 at 3:43 AM, Mac Lewis  > wrote:
> Hi Wrenches,
> 
> I have a buddy that would like to use a leftover SunPower E20-327-C-AC, panel 
> on his RV.  Obviously he would need to take the inverter off.  What I'm not 
> sure of is if this panel can operate in an ungrounded configuration, or 
> negative ground or does this still need a positive ground?  If it does need a 
> positive ground, are there any decent MPPT charge controllers that are fully 
> isolated from PV to battery side, that would allow PV + ground and Battery - 
> ground?
> 
> Thanks
> 
> -- 
> 
> 
> 
> Mac Lewis
> 
> "Yo solo sé que no sé nada." -Sócrates
> 
> 
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Re: [RE-wrenches] RV solar with SunPower

2018-01-20 Thread Marco Mangelsdorf 
A number of years ago SunPower switched to using a new cell that does NOT
require positive grounding.

So there should be no problem in using that 327 as described.

Marco

On Saturday, January 20, 2018, Mac Lewis  wrote:

> Hi Wrenches,
>
> I have a buddy that would like to use a leftover SunPower E20-327-C-AC,
> panel on his RV.  Obviously he would need to take the inverter off.  What
> I'm not sure of is if this panel can operate in an ungrounded
> configuration, or negative ground or does this still need a positive
> ground?  If it does need a positive ground, are there any decent MPPT
> charge controllers that are fully isolated from PV to battery side, that
> would allow PV + ground and Battery - ground?
>
> Thanks
>
> --
>
>
>
> Mac Lewis
>
> *"Yo solo sé que no sé nada." -Sócrates*
>
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Re: [RE-wrenches] RV solar with SunPower

2018-01-20 Thread Jerry Shafer 
Mac
I have used the sunpower 318 on trailers with the outback charge controller
FM-60, which was wired for positive ground. However this was the only power
on board, did not have any issues when connected to the truck or via the
outback PS 2 except when I connected the laptop to the Mate 3 and had it
plugged it to the inverter power, this would pop the GFI, I used an optical
interface to prevent this from happening. I will say the Outback is more
expensive then the panel so it may not be worth it.
Jerry

On Sat, Jan 20, 2018 at 3:43 AM, Mac Lewis  wrote:

> Hi Wrenches,
>
> I have a buddy that would like to use a leftover SunPower E20-327-C-AC,
> panel on his RV.  Obviously he would need to take the inverter off.  What
> I'm not sure of is if this panel can operate in an ungrounded
> configuration, or negative ground or does this still need a positive
> ground?  If it does need a positive ground, are there any decent MPPT
> charge controllers that are fully isolated from PV to battery side, that
> would allow PV + ground and Battery - ground?
>
> Thanks
>
> --
>
>
>
> Mac Lewis
>
> *"Yo solo sé que no sé nada." -Sócrates*
>
> ___
> List sponsored by Redwood Alliance
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> List Address: RE-wrenches@lists.re-wrenches.org
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>
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> www.members.re-wrenches.org
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>
>
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Re: [RE-wrenches] RV solar with SunPower

2018-01-20 Thread Dave Angelini Offgrid Solar 
I believe all of the E series will work. It was a series before that had
issues when not used as designed for. This unit is for a module inverter
and you would have to isolate the PV wiring or remove the inverter.

It is a great module and worth doing. You will need an mppt for 55 MPV
which almost any can do.

Good Luck!

> Hi Wrenches,
>
> I have a buddy that would like to use a leftover SunPower E20-327-C-AC,
> panel on his RV.  Obviously he would need to take the inverter off.  What
> I'm not sure of is if this panel can operate in an ungrounded
> configuration, or negative ground or does this still need a positive
> ground?  If it does need a positive ground, are there any decent MPPT
> charge controllers that are fully isolated from PV to battery side, that
> would allow PV + ground and Battery - ground?
>
> Thanks
>
> --
>
>
>
> Mac Lewis
>
> *"Yo solo sé que no sé nada." -Sócrates*
> ___
> List sponsored by Redwood Alliance
>
> List Address: RE-wrenches@lists.re-wrenches.org
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>
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> www.members.re-wrenches.org
>
>


Dave Angelini Offgrid Solar
"we go where powerlines don't"
http://members.sti.net/offgridsolar/
e-mail  offgridso...@sti.net
text 209 813 0060

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