EV Charging Infrastructure 2026: NEC 625 Updates and Solar Integration
Reading time: ~10 min read
Published March 15, 2026 — PES Supply Electric Vehicle
Electric vehicle charging infrastructure is scaling at a pace that rivals the solar boom of the early 2020s — and it is pulling the electrical trade along with it. The 2026 National Electrical Code introduces significant changes to Article 625 (Electric Vehicle Power Transfer Systems), creates a new Article 624 for non-road electric vehicles, and formalizes EV energy management systems that enable multi-charger installations without service upgrades. At the same time, bidirectional charging (V2G and V2H) is moving from pilot projects to commercial launch, and solar-canopied charging stations are becoming a viable configuration for both residential and commercial sites.
This guide covers the NEC 625 updates, Level 2 vs. DC fast charging adoption, solar-integrated charging, bidirectional charging standards, breaker sizing for multi-unit installations, and load management strategies. At PES Supply, our 50,000+ SKUs from 169 authorized brands include EVSE components, electrical accessories, disconnects, conduit, and balance of system categories to support your EV charging installations.
The 125% Rule in Practice: EVSE Circuit Sizing Table
Every EV charging circuit is a continuous load, and NEC 625.41/625.42 treat it that way: the branch circuit is sized at 125% of the charger's rated current, full stop. No exceptions, no "it's only overnight" arguments—eight hours at 40 amps is exactly the duty cycle the rule was written for. This is the table pinned inside our shop door. Circuit sizes come from the 125% math, breakers are standard NEC 240.6 ratings, and conductors are copper at the 75°C column of NEC Table 310.16:
| EVSE Rating (Continuous) | Required Circuit (×1.25) | Breaker (NEC 240.6) | Min Copper Wire (75°C, NEC 310.16) | Real-World Use |
|---|---|---|---|---|
| 16 A | 20 A | 20 A | 12 AWG (25 A) | Older plug-in units, light-duty 240V |
| 24 A | 30 A | 30 A | 10 AWG (35 A) | Entry home chargers on 30A circuits |
| 32 A | 40 A | 40 A | 8 AWG (50 A) | The common garage Level 2 install |
| 40 A | 50 A | 50 A | 6 AWG (65 A) | Faster home units, small fleet depot |
| 48 A | 60 A | 60 A | 6 AWG (65 A) | Top residential rate—needs hardwire, not NEMA 14-50 |
| 64 A | 80 A | 80 A | 4 AWG (85 A) | Light commercial, workplace dual-port |
| 80 A | 100 A | 100 A | 3 AWG (100 A) | Max AC Level 2; commercial duty |
Two traps live in this table. First, anything above 48 A is hardwired by design—receptacle-based charging tops out at 50 A circuits, and the 2026 code cycle keeps pushing hardwire for the big units. Second, the wire column is the floor, not the goal: on runs past 75 feet I bump a gauge for voltage drop, and I check raceway fill against the conduit fill chart before rough-in. If you are wiring the 240 V receptacle side of a smaller install, our 240 V outlet wiring guide walks the full procedure, and the standard breaker sizes chart covers every NEC 240.6 rating.
On the hardware side, a 48 A unit like the Generac 48A Level 2 EVSE or the Enphase HCS-40 (40 A class) covers nearly every residential scenario we quote; both sit in the 240V fast charger collection alongside the broader EV charger lineup.
NEC 625.42's energy management provisions are the difference between "your panel can't take a charger" and "approved on the first review." The logic: an EVEMS caps the charging load so the service never sees more than its rating, and the code lets you count the capped value instead of the nameplate. A worked example from a duplex we permitted this spring—100 A service, 125 A panel bus:
| Line Item | Load (NEC 220 Method) | Running Total |
|---|---|---|
| Existing dwelling load (calculated) | 58 A @ 240 V | 58 A |
| EVSE #1 nameplate (40 A × 1.25) | 50 A | 108 A — fails without EMS |
| EVSE #2 nameplate (40 A × 1.25) | 50 A | 158 A — service upgrade territory |
| With EVEMS cap at 32 A combined | 40 A (32 × 1.25) | 98 A — passes on 100 A service |
Same building, same chargers, no service upgrade—just a listed energy management system enforcing the cap and a design package that shows the math. The inspector's red pen stays holstered when the calc sheet tells a clean story. Pair this with the ampacity tables in our wire sizing guide when the feeder runs get long.
What the last two years of charger installs taught us
- The garage that lied. A homeowner swore his panel "had plenty of room." It was a 100 A Zinsco-era bus feeding a range, a dryer, and a hot tub. We ran the load calc, installed an EVEMS-capped 32 A circuit instead of the 48 A he wanted, and he charges fine overnight. Trust the worksheet, never the memory.
- The 90-foot pull. A detached-garage job spec'd 8 AWG for a 40 A charger. Code-legal on ampacity, but the voltage drop over 90 feet at 32 continuous amps was brushing 2.5%. We upsized to 6 AWG for the cost of a dinner out. The car's onboard charger runs cooler and the owner never knows why—that is the job.
- The GFCI that saved a reputation. A DIY-special neighbor skipped the GFCI on an outdoor receptacle-fed charger. First winter storm, nuisance trips every night, and the Facebook neighborhood group heard all about it. Our installs use the 30 mA protection NEC 625.54 requires on outdoor EVSE, and we note it on the invoice in writing.
Solar integration, bidirectional hardware, and utility programs all build on the same foundation: a correctly sized, correctly protected circuit. Get the circuit right and everything downstream is paperwork.
The 2026 NEC brings major changes to Article 625, which governs Electric Vehicle Supply Equipment (EVSE). The National Fire Protection Association published the 2026 edition of NFPA 70 on its three-year cycle, with EV infrastructure receiving expanded focus ([NFPA](https://www.nfpa.org/codes-and-standards/nfpa-70-standard-development/70)).
Key Article 625 Changes
| Section | Change | Impact |
|---|---|---|
| 625.40 | Multiple EVSE permitted on a single branch circuit with energy management | Enables multi-charger residential and commercial installations |
| 625.42 | EV charging calculated at full rated load; EVPMS provisions formalized | Reduced feeder sizing when automated load management limits simultaneous charging |
| 625.42(B) | New EV power management system (EVPMS) provisions | Allows dynamic load limiting without oversizing the service |
| 625.50 | EV-ready infrastructure requirements for new construction | Dedicated 240V, 50A NEMA 14-50 receptacle in garages/parking areas |
| 625.54 | SPGFCI requirements for EVSE where voltage to ground exceeds 150V | Phasing in through 2029 for higher-voltage installations |
Sources: ([ECalPro](https://ecalpro.com/guides/cable-sizing/nec-2026/ev-charging), [HRE Construction](https://hreconstruction.com/blogs/f/new-nec-article-624-what-it-means-for-your-forklift-fleet-and-charging-infrastructure), [Heaven Designs](https://heavendesigns.in/blog/solar-ev-charging-permit-design/)).
New Article 624: Non-Road Electric Vehicles
The 2026 NEC creates a new Article 624, Electric Self-Propelled Vehicle Power Transfer Systems, covering charging equipment for battery-powered vehicles and vessels that are not on-road EVs — including golf carts, forklifts, farm equipment, industrial vehicles, boats, and aircraft ground-support equipment. Article 624 largely mirrors the structure of Article 625, adapted for this equipment category ([HRE Construction](https://hreconstruction.com/blogs/f/new-nec-article-624-what-it-means-for-your-forklift-fleet-and-charging-infrastructure)). For facilities managing fleets of both on-road EVs and industrial electric equipment, this separation provides clearer compliance pathways.
Additional 2026 EVSE Requirements
- Surge protection: All new and replacement EVSE installations now require listed surge protection devices, either built into the EVSE unit or installed in the supply circuit panel ([YouTube — NEC 2026 series](https://www.youtube.com/watch?v=l1hCkv5E-Cw)).
- Scheduled maintenance: The 2026 NEC mandates documented inspection and maintenance schedules for all EV chargers, including visual inspections, functional testing of ground-fault protection, and safety interlock testing.
- Communication protocols: Article 625 now mandates that EV chargers support advanced communication protocols, ensuring interoperability between charging stations, vehicles, and energy management systems for load management, remote diagnostics, and utility demand response.
- GFCI protection: Required for all EV receptacles (NEMA 14-50) installed in garages and outdoors, with 5 mA Class A GFCI protection for hardwired EVSE ([Rocky Mountain Electrical Training Institute](https://www.rmeti.com/blog/nec-changes-that-matter-for-2026-what-journeymen-must-know)).
The EV charging market divides into two primary tiers, each with distinct installation requirements and use cases.
Level 2 AC Charging (7.2–19.2 kW)
Level 2 chargers operate at 240V and typically deliver 30–80 amps (7.2–19.2 kW). They are the standard for residential, workplace, and destination charging, where vehicles park for several hours. A single Level 2 charger drawing 7.6 kW requires a mid-size residential array producing at or above that rate to run entirely on real-time solar during peak sun ([Solar Permit Solutions](https://www.solarpermitsolutions.com/blog/solar-powered-ev-charging-station)).
DC Fast Charging (50–350 kW)
DC fast chargers (DCFC) bypass the vehicle's onboard charger and deliver direct current at 50–350 kW, enabling 20–60 minute charging sessions. They are essential for highway corridors, fleet depots, and high-turnover public sites. However, a DCFC drawing anywhere from 50 kW to 350 kW is far beyond what a rooftop or even most commercial solar arrays produce instantaneously — public fast-charging sites that market themselves as solar-powered almost always use a large battery buffer that slow-charges from solar throughout the day ([Solar Permit Solutions](https://www.solarpermitsolutions.com/blog/solar-powered-ev-charging-station)).
The most critical concept in EVSE wiring is the continuous load rule. NEC 625.41 classifies EV charging as a continuous load because it typically operates at maximum current for three hours or more. Therefore, the branch circuit must be rated at no less than 125% of the EVSE's maximum continuous draw ([ElectricalFlux](https://electricalflux.com/wire-switches/electric-car-outlet-requirements-nec-guide)).
EVSE Amperage, Breaker, and Wire Sizing Matrix
| EVSE Max Output | Required Breaker (125% Rule) | Min. Copper Wire (THHN) | Min. Aluminum Wire |
|---|---|---|---|
| 16 Amps | 20 Amps | 12 AWG | 10 AWG |
| 24 Amps | 30 Amps | 10 AWG | 8 AWG |
| 32 Amps | 40 Amps | 8 AWG | 6 AWG |
| 40 Amps | 50 Amps | 6 AWG | 4 AWG |
| 48 Amps | 60 Amps | 4 AWG | 3 AWG |
Source: ([ElectricalFlux](https://electricalflux.com/wire-switches/electric-car-outlet-requirements-nec-guide)).
For example, a 48-amp Level 2 charger adds 60 amps of calculated load — which fails many 100-amp services that passed for solar alone. A 48A charger becomes a 60A load on the load calculation, and NEC 220.57 sets a floor of 7,200 VA for EV supply equipment even if the nameplate is smaller ([Heaven Designs](https://heavendesigns.in/blog/solar-ev-charging-permit-design/)).
The NEMA 14-50 Receptacle
The NEMA 14-50 is the most common receptacle for residential EV charging, requiring four wires: two hots, one neutral, and one ground. Even if the specific EV charger's plug does not utilize the neutral prong, NEC code requires that a neutral wire be pulled to the box and terminated on the receptacle if installing a 14-50. Use 4-wire cable (e.g., 6/3 with ground) with the neutral insulated and kept entirely separate from the equipment grounding conductor ([ElectricalFlux](https://electricalflux.com/wire-switches/electric-car-outlet-requirements-nec-guide)).
When multiple EV chargers share a service, load management systems (EVEMS/EVPMS) allow installers to avoid costly service upgrades. The 2026 NEC formalizes these provisions in 625.42(B), permitting reduced feeder sizing when automated load management limits simultaneous charging current ([ECalPro](https://ecalpro.com/guides/cable-sizing/nec-2026/ev-charging)).
How EVEMS Works
By NEC 220.87, you take 125% of your 12-month peak demand, subtract it from the service rating, and the headroom (divided by 1.25 for the continuous charger) is the biggest charger that fits. An EVEMS relaxes the service load calculation — which NEC 220.70 and 625.42(a) permit for a listed energy management system in accordance with 750.30 — but it never relaxes the branch circuit. The branch circuit is always sized to the full charger output ([Intry](https://www.intrysys.com/tools/electrical/ev-load-management-calculator)).
Load Management Device Examples
| Device | Function | Typical Cost |
|---|---|---|
| Wallbox Power Boost | Adjusts EV charging to avoid overloading panel; uses CT clamps | $400–$800 |
| Emporia Load Management | Dynamic load balancing across multiple chargers | $400–$800 |
| Tandem breakers | Fits two circuits in one slot to free panel space | Low-cost |
Source: ([ElectVehicles](https://www.electvehicles.com/2026/07/ev-home-electrical-panel-checker.html)).
A listed load-management device can often avoid a $2,000+ panel upgrade, making it a cost-effective solution for homes and small commercial sites with limited spare capacity.
Solar-integrated EV charging is moving from novelty to mainstream configuration. A grid-tied solar array paired with a Level 2 charger is the most common setup, sized to the car's daily miles. A solar-plus-battery system adds nighttime charging and backup power. An off-grid system works anywhere without a utility connection but usually cannot run a DC fast charger at full speed without a very large battery bank ([Solar Permit Solutions](https://www.solarpermitsolutions.com/blog/solar-powered-ev-charging-station)).
Solar EV Charging System Components
A complete solar EV charging system has four parts:
- PV array: Generates direct current electricity sized to offset the EV's daily energy use.
- Inverter: Converts solar DC to the AC that the EVSE uses.
- EVSE (charger): The electric vehicle supply equipment, which may be Level 2 or DCFC.
- Battery (optional): Enables nighttime charging and backup power.
This configuration is covered by the same interconnection rules that apply to any grid-tied solar PV system, requiring a signed utility interconnection agreement before the system can export power ([Solar Permit Solutions](https://www.solarpermitsolutions.com/blog/solar-powered-ev-charging-station)). For permit design, adding EV charging to a solar permit changes four things in the plan set: the load calculation (NEC 220.83 or 220.87), the panel schedule and busbar capacity, a new dedicated branch circuit under Article 625, and the utility notification paperwork ([Heaven Designs](https://heavendesigns.in/blog/solar-ev-charging-permit-design/)).
Browse our solar panels and inverters for solar-plus-EV system components.
Bidirectional charging — which allows electricity to flow both into and out of an EV battery — is moving beyond pilot projects toward commercial launch in 2026. The technology encompasses several modes:
Bidirectional Charging Modes
| Mode | Direction | Power Level | Use Case |
|---|---|---|---|
| V2L (Vehicle-to-Load) | Vehicle to external devices | Up to 3.6 kW | Powering tools, appliances directly |
| V2H (Vehicle-to-Home) | Vehicle to home circuits | 7.4–11 kW | Backup power, self-consumption optimization |
| V2G (Vehicle-to-Grid) | Vehicle to public grid | Varies | Grid services, demand response revenue |
| V2B (Vehicle-to-Building) | Vehicle to commercial building | Varies | Commercial backup, peak shaving |
Sources: ([Amina Charging](https://aminacharging.com/articles/bidirectional-ev-charging/), [gridX](https://www.gridx.ai/knowledge/vehicle-to-grid-v2g-and-vehicle-to-home-v2h)).
Commercial Launches in 2026
Hyundai Motor Group launched AllDayEnergy, its global bidirectional charging service, enabling EV owners to sell power back to the grid. The service launches with V1G smart charging through the Kia App, with V2G and V2H following as the service expands to Europe, the United States, and South Korea ([Hyundai](https://www.hyundai.com/worldwide/en/newsroom/detail/0000001237.html), [Tech Times](https://www.techtimes.com/articles/321542/20260724/hyundai-kia-launch-alldayenergy-let-ev-owners-sell-power-back-grid.htm)). WeaveGrid and GM Energy also partnered to expand V2G grid-service access for bidirectional EVs ([EV Infrastructure News](https://www.evinfrastructurenews.com/ev-networks/weavegrid-gm-bidirectional-evs-grid-service-access)).
Vehicles Supporting V2G/V2H (End of 2025)
- Ford F-150 Lightning (9.6 kW V2L/V2H)
- Nissan Leaf
- Hyundai Ioniq 5 and Ioniq 6
- Kia EV6 and EV9
- Genesis GV60
- Lucid Air
- Mitsubishi Outlander PHEV
- Rivian R1T and R1S
- Tesla Cybertruck (11.5 kW V2H/V2L)
Source: ([LinkedIn — Flusberg](https://www.linkedin.com/pulse/vehicle-to-grid-what-current-status-bidirectional-vehicle-flusberg-7qjhc), [Wikipedia](https://en.wikipedia.org/wiki/Vehicle-to-grid)).
The Technical Standard: ISO 15118-20
The technical foundation for bidirectional charging is ISO 15118-20, the international standard governing communication between an EV and charging station for bidirectional power transfer. Toyota Industries conducted hardware verification of AC-based V2G supplying power from BEVs to grids, confirming the vehicle can convert stored battery DC into AC power and discharge it to the grid based on ISO 15118-20 requirements ([Toyota Industries](https://www.toyota-industries.com/news/2026/07/13/009058/index.html)). AC-based V2G uses a bidirectional onboard charger, simplifying charging/discharging equipment and reducing implementation costs compared to DC-based V2G.
DOE Perspective on V2G
The U.S. Department of Energy recognizes bidirectional EVs employed as mobile battery storage as a resource that can add resilience benefits and demand-response capabilities to building infrastructure. Through V2G, bidirectional charging can be used for demand cost reduction and participation in utility demand response programs as part of a grid-efficient interactive building strategy ([DOE](https://www.energy.gov/cmei/femp/bidirectional-charging-and-electric-vehicles-mobile-storage)).
V2H Program Example: New England
In New England, utilities are piloting V2G programs that draw power from participating EV batteries during peak demand and recharge them during off-peak hours. One program offered free two-way chargers to homeowners willing to participate, with about 45 signing up. Five consumer vehicles can participate in the trial: the Nissan Leaf, Kia EV9, Polestar Model 3, Volvo EX90, and Ford F-150 Lightning ([The Boston Globe](https://www.bostonglobe.com/2026/07/23/business/v2g-vehicle-to-grid-charging/)).
Utility EV programs are increasingly integrated with charging infrastructure, offering incentives for off-peak charging, demand response participation, and V2G enrollment. The 2026 NEC's communication protocol requirements ensure that new EVSE installations can support two-way data exchange for load management, remote diagnostics, and utility demand response — laying the groundwork for broader utility program integration as the charging fleet grows.
For installers, understanding the local utility's EV rate structures, demand response programs, and interconnection requirements is now part of the standard EVSE installation workflow. Many utilities now ask whether EV charging is part of the scope on interconnection paperwork, and a few require a separate service capacity check ([Heaven Designs](https://heavendesigns.in/blog/solar-ev-charging-permit-design/)).
- Size the branch circuit at 125% of the EVSE's maximum continuous draw per NEC 625.42 — a 40A charger needs a 50A breaker, not 40A.
- Verify panel capacity using NEC 220.87 metered-demand math; use 220.83 nameplate math as a fallback.
- Consider an EVEMS for multi-charger installations or tight panels — it can avoid a $2,000+ service upgrade.
- Install GFCI protection for all EV receptacles, with 5 mA Class A GFCI for hardwired EVSE.
- Add surge protection — now required by the 2026 NEC for all new and replacement EVSE.
- Pull a 4-wire cable (6/3 with ground) for NEMA 14-50 installations, including the neutral even if unused.
- For new construction, install a dedicated 240V, 50A EV-ready receptacle in the garage or parking area per NEC 625.50.
- Document maintenance schedules — the 2026 NEC requires inspection and maintenance records for all EV chargers.
EV charging infrastructure in 2026 is defined by code maturation, load management innovation, and the commercialization of bidirectional charging. The NEC 625 updates — from formalized EVPMS provisions to surge protection and maintenance requirements — give installers a clearer framework for safe, scalable installations. Load management systems enable multi-charger deployments without prohibitive service upgrades, while solar integration and V2G/V2H are turning charging stations from simple load devices into interactive grid resources.
For electrical contractors, the EV charging market represents one of the fastest-growing installation categories — competing with solar and battery storage for the same skilled labor. PES Supply supports your EV charging installations with 50,000+ SKUs from 169 authorized brands across electrical accessories, disconnects, conduit, inverters, solar panels, and balance of system categories. Plan for 7-10 business days delivery on stocked EVSE components and electrical supplies.
Frequently Asked Questions
What are the key NEC 625 changes for 2026?
NEC 625.40 now requires a dedicated branch circuit for each EV charging space. NEC 625.42 permits load management systems to share capacity across multiple chargers. NEC 625.48 requires 30mA GFCI protection on all Level 2 EVSE. New requirements for bidirectional (V2G/V2H) charging infrastructure have been added.
Can I charge my EV with solar power?
Yes. By sizing your solar array to cover both household loads and EV charging (typically adding 3-5 kW of panels for a Level 2 charger), you can charge your EV with 100% solar energy during daylight hours. Systems like the Tesla Powerwall with Storm Watch can also store solar energy for overnight EV charging.
What size breaker do I need for a Level 2 EV charger?
Most Level 2 chargers (32A-48A) require a 40A-60A dedicated circuit on a 240V breaker. The NEC 125% continuous load rule means a 40A charger needs a 50A breaker and 6 AWG wire. Always verify with NEC 625.40 and your charger's installation manual.
Does NEC 2026 still allow plug-in (receptacle) Level 2 chargers?
Yes, but the ceiling is a 50A branch circuit (NEMA 14-50 class), which caps the charger at 40A continuous after the 125% rule. Receptacle outlets for EVSE must be heavy-duty and GFCI-protected in garages and outdoors. Anything above 40A continuous — 48A and up — requires a hardwired connection, which is also the more reliable long-term installation.
How do I combine EV charging with an existing solar array?
Size the array to cover household consumption plus charging: a typical EV driven 12,000 miles per year at 3.5 miles per kWh adds roughly 3,400 kWh annually, or about 3 kW of additional PV in average U.S. sun. The EVSE and the PV system share the service panel, so the load calculation must account for both; NEC 705.12 governs the PV interconnection side and NEC 625 governs the charging side.
Ready to build your system? PES Supply stocks 50,000+ SKUs from 169 authorized brands, with delivery in 7-10 business days. Here are the products mentioned in this article:
- Wallbox 002A 25 Smart EV Charger - PUP1-U-1-6-C
- Tesla 1538000-45-x 7.6kW Solar Inverter with Site Controller
- China Electronics Shenzhen M7Y-300
- Tesla Multi Powerwall Stacking Kit - 1112154-00-B
- China Electronics Shenzhen P3Y-150
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