Solar PV Micro Inverter Interconnection

[happysanghvi]

We are doing one solar PV project where, we would like to have 68 enphase inverters.


The client has 240V, 3 Phase service. We would like to use M250 micro inverters, which is rated at 208V, 3 phase. How can we use these inverters if we want to use this for our project? Also, I would like to know how would we recombine more than 3 strings ?


Please write me back whenever you get a chance.

Thank You!

 

[GoldDigger]

Would the service be corner grounded or ungrounded 240 delta or 240Y/138?

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[Jraef]

What does Enphase have to say about it? it's their system after all and it's fairly unique.

 

[jaggedben]

With these inverters your options are limited...

Option 1: use a transformer to create a 208/120 wye to connect the solar to.

Option 2: IF it is a high-leg delta, connect 240V to the A-C phase and neutral. Do not use the high-leg.

You had best ask the utility which is the better option. If it's a high-leg delta and the high-leg is not rated for a high current then you are probably better off with option 2. See the recent thread on connecting to an open delta. If the service is designed for a relatively balanced 3-phase load, the transformer option might be what you have to do.