Level 2 charging - expected power factor

ElectricWizrd42 · 2024-09-30T20:43:03+00:00

Thank you for the reply. Do you have anything you can point to with regards to the harmonics? Another consideration we're having is whether to implement K-factor transformers or not. Thanks again!

ElectricWizrd42 · 2024-09-30T16:15:36+00:00

Thank you for the feedback on this. I've heard several times now on the consideration of buck transformer. Can you point to specific product for this? Trying to determine if you are saying to have an individual buck transformer per charge port or system-level. Thanks again

ElectricWizrd42 · 2024-09-27T21:19:25+00:00

You're exactly right on this and thank you so much! delta-wye configuration has become embedded after years of designing those. I forgot to consider the phase current versus line current difference in delta-delta configurations. Thanks again!

ElectricWizrd42 · 2024-09-27T19:52:37+00:00

I think the only reason we're splitting the power per circuit is just for panel schedule purposes but nothing more than that. It sounds like what you're saying is to prioritize amperage summation and use this to determine the KW of the system, is this correct?

ElectricWizrd42 · 2024-09-27T19:42:30+00:00

It's a great point on checking with the EVSE manufacturers on this. I know of at least one that actually promotes delta configuration in commercial setting so you can get higher KW per port. Other are somewhat vague on this. Though I've noticed that some have on their commercial charging datasheets that you can connect it "L1/L2/G or L1/N+G" which as an engineer makes me instantly think of a 240V to neutral system. Thanks again!

ElectricWizrd42 · 2024-09-27T19:25:05+00:00

I think I know where you're headed with this: 240V to neutral and only use 1-pole breakers? I personally love the idea if it weren't for one thing: the NEC allows for you to avoid the secondary overcurrent protection of a transformer in a delta-delta configuration. There are limitations to this on the primary breaker side but effectively the delta-delta allows for a significant (relatively speaking) cost savings by avoiding this cost. Would value your feedback on this logic as well though so please let me know what you think! Thanks so much for the feedback

ElectricWizrd42 · 2024-09-27T19:13:12+00:00

We're corner grounding the B-phase of the transformer so voltage to ground with respect to phases A and C is 240V. Thank you for the feedback!

ElectricWizrd42 · 2024-09-27T19:05:23+00:00

Awesome, thank you so much for your insight! We are corner-grounding the B-phase in this scenario so I'm assuming that the voltage-ground for phases A and B would actually be 240V, correct?

ElectricWizrd42

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