Commercial Tesla Wall Connector installation manual
Quick answer
A commercial Tesla Wall Connector install puts multiple units on power sharing, so they share one circuit and divide the available current across the vehicles charging at the time. The design hinges on the site's service capacity, single- vs three-phase power, and how many chargers run at once, so it starts with an electrical load study and an on-site assessment, then permit, trenching and conduit, installation, networking and access control, and commissioning each unit in the Tesla One app.For electrical contractors and facility owners planning a workplace, fleet, retail or multifamily EV charging install with Tesla Wall Connectors. By Charge Home Solutions, Tesla Energy Certified installers in all 50 states. Published 2026-10-14, updated 2026-10-14. About a 8-minute read.
At a glance
Core feature
Power sharing across multiple Wall Connectors on one circuit
Supply
Single-phase or three-phase, by site
Design driver
Service capacity + simultaneous-use needs
Starts with
On-site load study and assessment
Commissioned in
Tesla One app, per unit
What you are installing
This commercial Tesla Wall Connector installation manual covers how certified electricians design and install multiple Wall Connectors for workplaces, fleets, retail and multifamily sites. The defining feature is power sharing: several units share one circuit and automatically divide the available current across the vehicles charging at that moment, which lets a site add more charging ports without a proportional increase in service capacity.
Unlike a single home charger, a commercial Tesla Wall Connector install is a design project first. The number of ports, whether the supply is single- or three-phase, how many vehicles charge at once, and the trenching and conduit runs are all driven by the building's service capacity, so it begins with an electrical load study and a free on-site assessment rather than a fixed parts list.
Before you start
On-site load study
Assess the service size and available capacity, how many chargers must run simultaneously, and whether the supply is single- or three-phase. This determines the power-sharing group and whether added service capacity is needed.
Utility coordination
Larger sites often need the utility involved for added service capacity or a new service. Start this early, as it drives the schedule.
Site and civil plan
Plan conduit and trenching runs, charger locations, mounting (wall or pedestal), ADA and traffic considerations, and future expansion.
Networking and access
Decide access control, user authorization, and any billing or usage reporting, which affects the networking configuration at commissioning.
Installation, step by step
- 1
Load study and assessment
Assess service capacity and simultaneous-use needs, choose single- vs three-phase, and define the power-sharing group so the shared circuit is sized correctly.
- 2
Design and permit
Lay out the units, conduit and trenching, the shared circuit and panel, access and networking, and future expansion, then pull the commercial electrical permit.
- 3
Civil work: trenching and conduit
Run the trenching and conduit between the panel and charger locations, including pedestal bases where units are not wall-mounted.
- 4
Install the units and shared circuit
Install the breaker and shared circuit, mount the Wall Connectors, and land conductors and grounding per NEC and the unit manuals.
- 5
Configure power sharing
Set up the power-sharing group so the units divide the circuit's available current across charging vehicles, within the site's capacity.
- 6
Networking and access control
Configure access control, user authorization, and any billing or usage reporting the site needs.
- 7
Commission each unit in Tesla One
Commission every Wall Connector in the Tesla One app, update firmware, set the output, and verify the power-sharing group.
- 8
Verify under load and hand off
Verify current is balanced across units under simultaneous charging, confirm access and reporting work, pass inspection, and hand off the site controls.
Commercial vs residential Wall Connector install
| Aspect | Commercial | Residential |
|---|---|---|
| Units | Multiple on power sharing | Usually one |
| Supply | Single- or three-phase | Single-phase 240 V |
| Starts with | Load study + site plan | Home load calculation |
| Access/billing | Access control, reporting | Not typically needed |
| Civil work | Trenching, conduit, pedestals | Minimal |
Mistakes we see in the field
These are the errors that fail inspections and callbacks, from real installs. They are the difference between a system that works on day one and one that fails when it matters.
Sizing chargers without a load study
Putting too many full-power ports on a site without a load study trips the service or forces expensive emergency upgrades. Power sharing and the study set the real port count.
Ignoring future expansion
Running conduit and sizing the circuit only for today's ports means re-trenching later. Plan spare capacity and conduit for growth.
Leaving networking for last
Access control and billing affect the configuration; deciding them after install means re-commissioning units.
Overlooking three-phase options
Many commercial services are three-phase; designing as if single-phase can leave capacity and balance on the table.
What to expect: timeline
- Timeline is site-specific: a small workplace bank can be days; larger fleet or multifamily sites with trenching and a utility upgrade run longer.
- Utility coordination for added service capacity is often the critical-path item, so it is started first.
- A free on-site assessment produces the real scope and schedule.
Tesla's official manual & video
Tesla's Wall Connector installation documentation covers the unit-level mounting, terminals, torque and power-sharing setup. A commercial design wraps that in the site's load study, phase and civil plan; this page is that process.
▶ Tesla's official commercial charging & Wall Connector resources →Related guides & services
Tesla Installation Hub
The pillar hub: every Tesla product install guide, manuals and videos in one place.
Open →Commercial EV charging installation
Workplace, fleet, retail and multifamily EV charging. Free on-site estimate, all 50 states.
Open →Wall Connector manual
The residential Wall Connector install manual.
Open →Tesla One commissioning
How each Wall Connector is commissioned and registered in the Tesla One app.
Open →Frequently asked questions
Power sharing lets multiple Wall Connectors share one circuit. The units automatically divide the circuit's available current across the vehicles charging at that moment, so a site can add more charging ports without a proportional increase in service capacity. The group size and circuit are set by the on-site load study.
Not always, but many larger commercial services are three-phase, which helps carry more chargers and balances the load. Whether single- or three-phase is right is determined in the load study, along with whether the utility needs to add service capacity.
It depends on the service capacity and how many vehicles charge at once, not a single fixed number. Power sharing lets more ports run on a given circuit by dividing current, and the load study sets the practical maximum and whether a service upgrade is needed to add more.
An on-site load study and assessment. Because the design depends on the building's service, phase, simultaneous-use needs, trenching, and future expansion, the scope and schedule come from that assessment rather than a fixed parts list. Charge Home Solutions provides it free.
Commercial EV charging, designed and installed right.
Free on-site assessment and load study, licensed and insured, Tesla Energy Certified, all 50 states. Power-sharing design for workplaces, fleets, retail and multifamily.