Solar- and EV-Ready Electrical Service
200-amp breaker box with capacity to add future solar PV and electric-vehicle chargers.
Spec
Applies uniformly from Platinum upward.
Scope
The main electrical service panel and the conduit/wiring runs from panel to roof and panel to the EV-charging location.
Requirements
- 01.
Main service must be at least 200 amps.
- 02.
Panel must have a dedicated 60A+ breaker space reserved for future solar PV interconnection (NEC 705 backfeed).
- 03.
Panel must have a dedicated 40A+ breaker space (with conduit run + outlet box) for a Level 2 EV charger.
- 04.
Conduit must be run from the main panel to the roof (for future solar inverter) and from the panel to the primary parking space (for the EV charger).
Documentation
Evidence the inspector / Institute will need.
- 01.
Panel schedule listing all breakers, with the reserved solar + EV breakers labeled.
- 02.
Photo of the installed panel.
- 03.
Marked-up electrical plan showing the conduit runs and termination points.
- 04.
Electrical permit + final inspection sign-off.
Guidance
Why this is cheap to do now and expensive later
Adding the EV-ready conduit + 240V outlet during initial wiring costs ~$300-$800. Retrofitting after drywall and finishes are in often costs $2,000-$5,000 and may require surface-mounted conduit. The panel + solar conduit story is similar.
Resources
- NEC 705 — Interconnected Power Production Sources
Code section governing solar backfeed. The most common compliance path is the 120% rule: PV breaker + main breaker ≤ 120% of panel busbar rating.
- EV Charger Installation Cost Guide →
DOE guide to Level 2 charging selection and installation.
Note
SB-100 (California), HB 6-1-23 (Colorado), and similar state laws now require new construction to be EV-ready. Even where not required by code, the resale premium for EV-ready homes is documented at $1,500-$3,500.