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In my 13 years installing solar in Texas, I've never had a utility come back and say "you must set a PCS limit of 2KW through this 25KW transformer or you can pay to upgrade the transformer."<br>
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System is 12KW of solar (9KW AC equiv.) and 6x Enphase 5P batteries (23KW AC) so total of 32KW of potential power export if the batteries were grid-exporting at same time of peak solar production. I can see the batteries charging at 23KW if charging from grid
but of course solar can never be a load. And exporting battery power simply not a financially smart option.</div>
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So the only answer I can come up with is this transformer is serving more than this home and seems undersized by utility if it's serving multiple homes with 200-amp services. Few words from Oncor is that this is the issue.<br>
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I alerted Oncor to the Power Control System capabilities to limit power export and they are insistent that 2KW is all they can take (they never said if this a import or export limit). I asked if this was a grid-tied system only with no ESS, would it have come
back with the same 9KW (AC) limit? I think they are tripping over the combined connected capacity of solar + ESS.<br>
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Anybody else in Texas running into this recently? I told Oncor I'd be perfectly fine with 9KW export capability (the solar) and limit grid-charging to this power, too.<br>
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This isn't Hawaii...so I'm super surprised and about to lose a lot of money.</div>
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<b>Howard "Scot" Arey</b></div>
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<b>Owner, Solar CenTex</b></div>
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NABCEP PV Installation Professional</div>
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TECL 29755</div>
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254-300-1228 </div>
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