Wallbox Quasar 2 (12.8kW CCS1 V2H/V2G) Bi-Directional Charger & Solar Integration Guide
How the universal Wallbox Quasar 2 (12.8kW CCS1 bi-directional charger) integrates the DC-to-AC inverter inside a compact garage wall unit, pairs with the 200A Power Recovery Unit (PRU), and enables California DSGS & PG&E V2G payouts.
1. V2H Electrical Engineering, Transfer Switching & Solar AC/DC Coupling
Step 1 — All-In-One DC Bi-Directional Inverter Inside the Charger Enclosure: Unlike 1st-gen V2H systems that required three huge boxes on the wall, the Wallbox Quasar 2 integrates a 12.8kW Silicon Carbide (SiC) bi-directional DC-to-AC inverter directly inside the sleek wall charger—requiring only a single 60A 240V AC circuit to the Wallbox Power Recovery Unit (PRU).
Step 2 — 200A Whole-Home Backup via the Wallbox Power Recovery Unit (PRU): The Wallbox PRU installs at the 200A service entrance (between your utility meter and main load panel), containing the UL 1741 SA / IEEE 1547 motorized grid-isolation relay, revenue-grade CT energy meters, and automatic <100ms blackout transfer controller.
Step 3 — Direct Solar Surplus Charging & Off-Grid AC-Coupled Solar Support: Using the integrated split-core CT clamps inside the PRU, Quasar 2 measures real-time solar export and throttles EV charging to absorb 100% of excess solar. During a blackout, the PRU supports AC-coupled rooftop solar arrays so your panels continue operating off-grid.
Step 4 — Qualifying for California PG&E / CEC Bi-Directional EV Rebates & VPP Incentives: Because Wallbox Quasar 2 is certified to UL 9741, UL 1741 SB, and California Rule 21 Phase 3, homeowners in PG&E, SCE, and SDG&E territory can enroll in dynamic V2G export pilots and demand-response programs.
2. Single-Line Electrical Schematic & Architecture Comparison
Size Your EV Solar Array →WALLBOX QUASAR 2 (12.8KW V2H/V2G) SINGLE-LINE WIRING DIAGRAM
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[Utility Meter 200A]
│
▼
[Wallbox Power Recovery Unit (PRU — 200A Automatic Transfer Switch & CTs)]
│
├────► [60A 2P Breaker + CAN/Ethernet] ──► [Wallbox Quasar 2 (12.8kW SiC Inverter)]
│ │ (CCS1 ISO 15118-20 DC)
│ ▼
│ [Kia EV9 / CCS1 EV (100 kWh)]
├────► [Rooftop Solar Array Breaker (Enphase / String Inverter)]
└────► [200A Main Home Load Center (50A / 12.0kW Continuous Backup)]V2H Bi-Directional Charging & Solar FAQ
Why does the Wallbox Quasar 2 use a CCS1 plug instead of a J1772 AC plug?
Most current non-Tesla EVs do not have a bi-directional AC inverter built inside the car; their onboard AC charger only flows one way (into the battery). By connecting directly to the high-voltage DC battery pins via CCS1 (using ISO 15118-20 communication), the Wallbox Quasar 2 bypasses the car’s one-way onboard charger and performs the 12.8kW DC-to-AC conversion inside the Wallbox unit on your garage wall!
Can I use a CCS1-to-NACS (J3400) DC adapter with the Wallbox Quasar 2 as new EVs switch to NACS ports?
Yes! Because NACS (SAE J3400) uses the exact same PLC / ISO 15118-20 communication protocol and high-voltage DC signaling as CCS1, passive UL 2252 certified CCS1-to-NACS DC adapters (and swappable Wallbox NACS Whip cables) maintain full bi-directional DC compatibility.
How much peak startup surge can the Wallbox Quasar 2 handle for central air conditioners?
With 12.8 kW (53.3 Amps @ 240V) of continuous output and built-in surge capability, a Quasar 2 paired with a $329 Micro-Air EasyStart soft-starter on your AC compressor can easily start and run a 3-ton to 5-ton central heat pump during a power outage.