Adding solar panels and a Level 2 EV charger to the same home is increasingly common in New Jersey — and increasingly complicated to wire properly. Both systems require significant dedicated capacity from your main electrical panel, and when combined, they introduce code requirements around solar interconnection, load calculation methodology, and bidirectional power flow that most general electricians are not well-versed in.
Here is how the process works when both systems are going on the same NJ home, including the specific NEC and NJ code considerations that affect the design.
The Core Challenge: Panel Capacity for Both Systems
A grid-tied solar installation requires space in your main panel for the solar interconnection breaker. Under NEC 705.12, the total of all supply-side breakers (utility main plus solar interconnection) cannot exceed 120% of the panel's busbar rating. For a 200A panel with a 200A busbar, you can have a maximum of 240A total between the main breaker and the solar interconnection breaker.
An EV charger requires its own dedicated circuit — typically a 40A–60A breaker for a Level 2 charger. This is a load-side demand that must be accommodated within the panel's available capacity.
When you are adding both solar and an EV charger to a panel, the calculation involves:
- Current household load (NEC Article 220 calculated load)
- Solar interconnection breaker size
- EV charger circuit breaker size (continuous load, 125% multiplier per NEC 625.42)
- Whether NEC 705.12 load-side or supply-side solar interconnection applies
This is not a back-of-napkin calculation — it requires a proper load study and panel evaluation by a licensed NJ electrician with solar interconnection experience.
The 120% Rule for Solar Interconnection
NEC 705.12(B)(2)(3)(b) — commonly called the "120% rule" — is the key constraint for load-side solar interconnections (the most common configuration for residential solar). The rule states:
Solar interconnection breaker size ≤ (Panel busbar rating × 120%) – (Main breaker rating)
For a 200A panel with a 200A busbar: Solar breaker ≤ (200A × 120%) – 200A = 240A – 200A = 40A maximum.
A typical residential solar system with a string inverter or microinverters in the 5–10 kW range requires a 40A–60A interconnection breaker. If you need a 60A solar breaker but the 120% rule limits you to 40A, you have three options: upgrade to a panel with a higher busbar rating, use a supply-side interconnection, or reduce the solar system size. An experienced solar electrician will evaluate which option is most cost-effective for your situation.
How an EV Charger Affects the Solar + Panel Equation
Adding an EV charger to a solar-equipped home is usually straightforward when the panel has adequate remaining breaker space and busbar capacity — the charger is simply another 240V load circuit. The more nuanced situation is when you are adding solar, an EV charger, and potentially a battery storage system all to the same panel simultaneously.
In these combined installations, we often recommend:
- A 200A panel upgrade if the home is currently at 100A service — both solar and EV charging need the headroom
- A main breaker panel position for solar (supply-side interconnection) if load-side space is insufficient
- A critical loads subpanel when battery backup is also involved — the battery backs up the subpanel, not the entire house
- Load management to prevent the EV charger from drawing during periods of peak household load
The NJ Permit Process for Solar + EV Charger
In New Jersey, solar installations require a separate permit from the EV charger installation in most municipalities — they are two different scopes of work. You need:
- Electrical permit for the EV charger circuit (applied through the municipal construction office)
- Electrical permit for the solar installation (separate application, includes inverter and panel interconnection)
- PSE&G or JCPL interconnection application for the solar system (required to get net metering)
- NJ electrical inspections for both scopes of work
We coordinate both permits simultaneously when homeowners are installing solar and EV charging together — this avoids sequential delays and allows a single construction inspection for both systems when the timing works out.
NJ Incentives for Combined Solar + EV Charging
The combination of solar and EV charging in NJ qualifies for multiple incentive layers:
- Federal 30% Residential Clean Energy Credit (Section 25D) — applies to solar panels, inverters, installation labor, and battery storage (if included)
- SRECs (Solar Renewable Energy Certificates) — NJ's TREC/SREC-II program provides ongoing revenue for solar generation
- JCPL EV Driven Program rebate (for JCPL customers, closing July 15, 2026) — up to $2,000 toward EV charger hardware and installation
- NJ Garden State Energy Storage Program — $1,625 if battery storage is also included
The combination of federal tax credits and state incentives makes a solar + EV charger + battery system one of the most financially compelling electrical upgrades available to NJ homeowners in 2026. We can walk you through the full incentive stack for your specific situation.
Call (848) 294-1739 or visit malfettonegroup.com/contact to schedule a free site assessment.