Electrical Panel & Solar - Center Fed and 100A?

[sensij]

I think enphase inverters require the neutral, so 10/3 would be needed. At least the engage cable has a neutral in it. Not sure what it is used for - voltage monitoring maybe?

Yeah, thanks. I whiffed on that. I think the neutral is required for UL compliance, if nothing else. Enphase uses it for the powerline communication too.

[Dan Z]

Yup, 10/3: two phases for the 240 V and one neutral. Plus earth ground. I forgot they output 240 V.

I believe data for the envoy is sent by the microinverters and embedded in the 60 Hz signal. The envoy gets the data through it's own 120 V power cord.

[Dan Z]

From Enphase: "The voltage types are either single-phase or three-phase. All Engage Cable connectors bear labels indicating the voltage designation. Single-phase (3G2.5) Engage Cable includes three conductors. Three-phase (5G2.5) Engage Cable includes five conductors. Because Enphase microinverters output onto one phase, the 5G2.5 Engage Cable balances the phases by rotating conductor use from one microinverter to the next as shown in the following diagram. "

3G2.5 cable (ET10-240) is for 240 V (residential) So, the 240 V microinverters are one phase after all. Three conductors: line, neutral and earth ground.

[inetdog]

From Enphase: "The voltage types are either single-phase or three-phase. All Engage Cable connectors bear labels indicating the voltage designation. Single-phase (3G2.5) Engage Cable includes three conductors. Three-phase (5G2.5) Engage Cable includes five conductors. Because Enphase microinverters output onto one phase, the 5G2.5 Engage Cable balances the phases by rotating conductor use from one microinverter to the next as shown in the following diagram. "

3G2.5 cable (ET10-240) is for 240 V (residential) So, the 240 V microinverters are one phase after all. Three conductors: line, neutral and earth ground.

It seems reasonable that the three phase 208Y/120 connection also has each inverter supplying power from line to line (at 208 instead of 240) with the neutral not playing any role in power transfer.

[sensij]

3G2.5 is the part number for European installations. Their electrical standard is hot, neutral, ground. In the US, you have two hot phases 180 deg apart. Look closely at the US datasheet, you'll see red, black, white, and green.

[Dan Z]

That makes more sense and matches the photos I saw. But, on the SDG&E net metering application they only list 1 phase and 3 phase as options. Not sure what to make of that. I'm checking 1 phase to match the 240 V.

[sensij]

Yes, residential electric is 240 V single phase. In the US, because the 240 v is delivered by two hot conductors each 120 V to ground, but 180 deg apart in phase, it is sometimes called split phase power. In Europe, there is really a single conductor that runs 220 V-240 V to ground.

[inetdog]

Yes, residential electric is 240 V single phase. In the US, because the 240 v is delivered by two hot conductors each 120 V to ground, but 180 deg apart in phase, it is sometimes called split phase power. In Europe, there is really a single conductor that runs 220 V-240 V to ground.

And in all cases the micro output is single phase involving two wires, only the trunk cable and the voltage programming differ.