Can someone give me a simple diagram in autocad on how to setup a 3pole / 3phase connection?

ChanChan Registered Users Posts: 45 ✭✭
Can someone give me a simple diagram in autocad on how to setup a 3pole / 3phase connection? Do I need multiple inverter since normal inverter has a 2 pole input and output only or is there an inverter that is already a 3 phase connection?


  • mike95490mike95490 Solar Expert Posts: 9,022 ✭✭✭✭✭
    edited July 2016 #2
    How much power are you needing ?   If just a little bit of 3ph, a  single phase inverter into a 3 phase transformer could do the job.  At some point, 3 inverters cost less than a big transformer
    Powerfab top of pole PV mount | Listeroid 6/1 w/st5 gen head | XW6048 inverter/chgr | Iota 48V/15A charger | Morningstar 60A MPPT | 48V, 800A NiFe Battery (in series)| 15, Evergreen 205w "12V" PV array on pole | Midnight ePanel | Grundfos 10 SO5-9 with 3 wire Franklin Electric motor (1/2hp 240V 1ph ) on a timer for 3 hr noontime run - Runs off PV ||
    || Midnight Classic 200 | 10, Evergreen 200w in a 160VOC array ||
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  • BB.BB. Super Moderators, Administrators Posts: 31,068 admin
    Are you trying to do Grid Tied to a 3 phase utility power system--Then you connect 1-3x single phase inverters to your three phases based on voltage (i.e., if you are 220 phase to phase, then p1 and p2 to first inverter, p2 and p3 to second inverter, and p3 to p1 for third inverter--In the US, typical 10 kWatt maximum per inverter if less then 3 inverters). Also, in some cases, the utility may require something to turn off all 2-3 inverters if a single phase is lost.

    There are two types of three phase power connections... Delta and Wye ("Y" or "Star"). Each type has different voltages (in the US, Wye is common for small business--120 from neutral (center of "star") to each hot leg, and 208 between each hot leg).

    From what I have seen, most all smaller GT inverters are native single phase--Some have control inputs to detect/shut down on loss of phase. Only large inverters (50 or 100 kW and above) seem to have three phase native units.

    If you are looking for off grid 3 phase power--That is difficult to justify three relatively large OG inverters (say 4-8 kW each) wired up to support three phase off grid (battery backed) power. These are very large systems (for off grid use) and not usually cost effective for smaller installations--And large installations are expensive (batteries, solar panels, inverters, wiring, backup genset, etc.).

    Near San Francisco California: 3.5kWatt Grid Tied Solar power system+small backup genset
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