[RE-wrenches] Positive grounded arrays

[Brian Mehalic]

Fronius Galvo can be positively grounded. But the instructions literally say to take the factory-installed fuse (neg to ground) and install it between positive and ground “outside the inverter.”

Brian

> On Oct 14, 2020, at 4:10 PM, Ray <ray at solarray.com> wrote:
> 
> 
> The Midnite Solar Classic Controller used to be able to be positive grounded.  The Classic 250 can do five 60 cell modules in series.
> 
> Ray Walters
> Remote Solar
> 303 505-8760
> On 10/14/20 3:18 PM, Dave Angelini Offgrid Solar wrote:
>> I got around this for a client by adding an XW and the high voltage MPPT.   It has a positive ground option and it worked well. Scheider now has a 100a Mppt version BTW. Pretty easy way to solve it and add batteries. Use a Radian also if the FM100 can be negative grounded.
>> 
>>  
>> Dave Angelini Offgrid Solar
>> "we go where powerlines don't"
>> http://members.sti.net/offgridsolar/
>> e-mail  offgridsolar at sti.net
>> text 209 813 0060
>>>  
>>> 
>>> 
>>> On Wednesday, October 14, 2020, <louis at solarcowboyz.com> wrote:
>>>> Looking for feedback on the following, any help would be appreciated;
>>>>  
>>>> Positive grounded arrays(Sunpower systems) what is being used as an Inverter replacement?
>>>> Hard to get SMA's SBxxxxUS older style units that have the built-in POS/NEG grounding capability...
>>>> As far as I know the newer line of Inverters from SMA will not work ; they are TL's and are not compatible.
>>>>  
>>>> It would be tempting to "Un-Ground" the array and use the newer line of TL Inverters from SMA.
>>>> The Discon would need to do both POS/NEG lines;OK
>>>> I know of this being done with Arrays that are NEG grounded.
>>>>  
>>>> How much of a Power loss from the array would be expected due to removing the POS ground on Sunpower panels and run them Un-grounded ?
>>>> Guessing say 15 to 20% ?
>>>>  
>>>> This may be a solution that the customer would go along with short of replacing the entire system.
>>>>  
>>>>  
>>>>  
>>>>  
>>>> Best Regards
>>>> Louis Segarra 
>>>> Tech Department/Field Operations
>>>> Solar Cowboyz
>>>> (530) 273-4895
>>>> (916) 212-0282
>> 
>> 
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