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

[Vince McClellan]

If you want to go with the transformer route, try Dongan Transformers.
They've helped us a few times with tech support, and they should be able to
help in this situation.

As I understand it though, there is a loss of efficiency when you
grid-tie through an open delta. I have the same issue with a large
residential installation. My client is deciding whether to upgrade his
service to a 240 split phase as he doesn't need the three-phase power. Most
utilities I know of are phasing out the old 240 Delta services. Pun
intended.

Best of luck,

Vince McClellan

Energy Design

NABCEP PV Installation Professional

p. (541) 485-8122  f. (541) 338-8202

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On Tue, Jun 6, 2023 at 10:43 AM Drake Chamberlin via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> 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
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