[RE-wrenches] Positive grounded arrays

[Ray]

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 
> <mailto:offgridsolar at sti.net> text 209 813 0060*
>>
>>
>> On Wednesday, October 14, 2020, <louis at solarcowboyz.com 
>> <mailto: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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