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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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*
>
> ___
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> List Address: RE-wrenches@lists.re-wrenches.org
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>
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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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>


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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[RE-wrenches] RV solar with SunPower

2018-01-20 Thread Mac Lewis 
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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