enblethen wrote:
Morningstar says the ground to the inverter must be larger then the DC power wiring. Why? I donot know!
The AC line indicates putting the neutral to earth ground. Strange! Sounds like they are using the heat sink as neutral. Make sure you frame ground is good as it is doing dual functions.
Ground 30 amp receptacle to frame with min #12.
The following is copied and pasted from the installation instructions for the Morningstar SureSine. I used 4 gauge for all the wires to the inverter, because I had no 6 guage and I did have 4 gauge I wasn't using.
1. Wire Earth Ground as shown in Figure 5 using UL Listed 4 AWG (25
mm2
) or larger green wire. The Earth Ground conductor must be larger
than the battery power conductors.
2. Wire 12V battery negative to the negative DC input terminal using UL
Listed 6 AWG (6 mm2
) or larger black wire. 3. Connect the 12V battery positive cable (red) to the DC input positive
terminal on the SureSine using UL Listed 6 AWG (6 mm2
) or larger red
wire.
4. Wire an in-line fuse in the positive battery cable (red) no further than
12” (305 mm) from the Battery positive post. Do not connect the
battery positive cable to the battery at this time.
