EG4 18kPV Whole-Home 200A Backup Single-Line Wiring Diagram (NEC 2023 Blueprint)
Complete Master Electrician Single-Line Diagram (SLD) for wiring the EG4 18kPV-12LV all-in-one hybrid inverter and EG4 14.3kWh PowerPro WallMount battery for 200A whole-house backup without a critical-loads subpanel.
Single-Line Electrical Schematic (SLD)
Service Rating: 200A Whole-Home Service Passthrough
[UTILITY METER (200A)]
|
(2/0 Cu or 4/0 Al)
v
[200A Lockable Knife-Blade Utility AC Disconnect (Service Entrance Rated w/ N-G Bond)]
| <-- Clamp L1 & L2 Grid CT Sensors Here (Arrow Pointing Toward Inverter/Loads!)
v
+-----------------------------------------------------------------------+
| EG4 18kPV-12LV HYBRID INVERTER |
| [200A GRID LUGS] ===(Internal 200A Transfer Relay)===> [200A LOAD] |
| ^ | |
| [MPPT 1/2/3] <-- #10 AWG PV Wire (3 Strings) | |
| [GEN PORT] <-- #6 AWG (Up to 90A Generator / AC Solar) | |
| [BAT LUGS] <-- Dual 2/0 AWG Cu + RJ45 Closed-Loop CAN | |
+--------------------------------------------------------------|--------+
| |
v v
[EG4 PowerPro 14.3kWh WallMount LFP] [Existing 200A Main Breaker Panel]
(UL 9540 Conduit Box · 200A Int. Breaker) (Unbond Neutral from Ground Here!)Conductor Gauge (AWG), Breaker & Torque Schedule (75°C Column)
| Circuit Segment | Conductor Gauge (AWG) | OCPD Breaker / Fuse | Conduit & Lug Torque |
|---|---|---|---|
| Utility Meter -> 200A Service Disconnect -> 18kPV GRID Lugs | 2/0 AWG Copper or 4/0 AWG Aluminum (THWN-2) + #4 AWG Cu EGC | 200A 2-Pole Service Entrance Breaker | 2'' EMT/PVC · Torque 18kPV Grid Lugs to 240 in-lbs (20 ft-lbs) |
| 18kPV LOAD Lugs -> Existing 200A Main Load Panel | 2/0 AWG Copper or 4/0 AWG Aluminum (THWN-2) + #4 AWG Cu EGC | Protected by 18kPV Internal 200A Load Breaker | 2'' EMT/PVC · Isolate Neutral & Ground in Downstream Load Panel |
| 18kPV BAT Lugs <-> EG4 14.3kWh PowerPro WallMount | Supplied Dual 2/0 AWG Fine-Strand Copper Battery Harness + RJ45 CAN | Internal 250A DC Breaker (18kPV) + 200A DC Breaker (PowerPro) | Pre-fitted UL 9540 Conduit Box · M8 Bolt Torque 150 in-lbs |
| Rooftop Solar Strings -> 18kPV MPPT 1, 2, 3 | #10 AWG UL 4703 PV Wire (600V) + #6/#8 AWG Cu Equipment Ground | Integrated IMO Rotary DC Isolator Switch on 18kPV | 3/4'' EMT Metallic Conduit (Required Inside Building per NEC 690.31(G)) |
NEC 2023 Code Compliance & Electrician Commissioning Checklist
⚖️ NEC 2023 CODE📜 Mandatory NEC Code Compliance Notes (NEC 2023 Art. 690, 705.12, 706 & UL 9540)Pass your municipal AHJ rough and final electrical inspection on the first visit.
- ⚡NEC 250.24(A)(5) Neutral-to-Ground Bond Rule: Because the 200A Service Entrance Disconnect upstream of the 18kPV is now the 'First Means of Disconnect,' the single-point Neutral-to-Ground bond MUST live in that upstream 200A service disconnect. You MUST remove the green bonding screw in your downstream 200A house panel and separate neutrals and grounds onto isolated busbars.
- ⚡NEC 690.12 Rapid Shutdown: Connect the 18kPV internal 12V RSD transmitter power supply to Tigo TS4-A-F roof receivers, and mount a red outdoor Emergency RSD Mushroom Pushbutton beside the utility meter.
- ⚡NEC 706.15 Battery Disconnect & Working Space: Maintain 36 inches of clear unobstructed working depth in front of the 18kPV and PowerPro WallMount.
🛠️ COMMISSIONING✅ Master Electrician Pre-Energization & Commissioning ChecklistVerify polarity, CT orientation, and firmware before throwing the main breaker.
- ✓Verify L1 and L2 polarity consistently from the utility disconnect -> 18kPV Grid Lugs -> 18kPV Load Lugs.
- ✓Set Battery Type to 'Lithium' and Protocol '00 (EG4)' so the inverter reads exact State of Charge (SoC %) via the RJ45 CAN cable.
- ✓Disable 'N-PE Bond Relay' in settings if your upstream service entrance disconnect already bonds Neutral to Ground and Neutral is solid-through.
❓ ELECTRICIAN FAQWhy did my EG4 18kPV trip or read negative house wattage after installation?
99% of the time, the L1 and L2 split-core CT clamps were either clipped on facing the wrong direction (arrow must point toward the inverter/load) or L1 CT was clipped onto the L2 phase conductor.
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