[RE-wrenches] Open Delta to 208Y/120 Volt

[drake.chamberlin at redwoodalliance.org]

William, 

Sol-Ark says they can only connect to a Wye, and that they need a
neutral. 

Thanks, 

Drake

---

On 2023-06-06 11:34, William Miller via RE-wrenches wrote:

> Drake: 
> 
> You should be able to connect to a 120/240 split phase feeder. Avoid the stinger. I have done it with FXRs , works just fine.  
> 
> Wm 
> 
> On Tue, Jun 6, 2023 at 8:11 AM Drake Chamberlin via RE-wrenches <re-wrenches at lists.re-wrenches.org> wrote: 
> 
>> Hello All,
>> 
>> We are looking for a transformer to connect Sol-Ark inverters to an open 
>> delta service. The Sol-Ark can only connect to a Wye configuration.
>> 
>> We found one which the supplier says will do the job. It is an MGM, 240 
>> Delta to 208Y/120 Volt, 3-Phase.
>> 
>> The supplier says this will derive a neutral which can be grounded for a 
>> solid neutral connection.
>> 
>> My concerns with what we have found so far are:
>> 1) How much efficiency will be lost due to connecting to an open delta?
>> 2) Will the derived neutral really be sufficient?
>> 3) The cost of the unit we found is high. Does anyone know of a source 
>> for economically priced transformers.
>> 
>> Thank you,
>> 
>> Drake
>> 
>> Drake Chamberlin
>> Athens Electric LLC
>> Ohio Electrical Contractor's License 44810
>> CO Master Electrician's License 4526
>> NABCEP Certified PV Installation Professional
>> 
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> -- 
> 
> William Miller
> Miller Solar.com
> 805-438-5600
> www.millersolar.com [1] 
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