Six Electric Cars, One Circuit. But Who Pays for the Electricity?

Recently, I had an interesting conversation with Ernesto Rois-Mendez, a Dallas, Texas-based inventor and founder of EVPowerRouter, a new approach to sharing EV charging infrastructure.

After more than three years of development, Ernesto recently launched a device that his company says is UL Listed as an industrial control panel and that allows up to six electric vehicles to share a single electrical circuit.

Ernesto was granted U.S. Patent No. 12,623,565 in May 2026, covering a specific hardware system and method for distributing electrical power sequentially among multiple EV charging outlets using timer-controlled switching.

How does it work?

Rather than dividing available power among several vehicles simultaneously, EVPowerRouter delivers full charging power to one vehicle at a time.

A building manager programs a repeating schedule, assigning each vehicle its own charging window.

The system operates without Wi-Fi, an app, or ongoing subscriptions. Drivers can park in their assigned spaces and leave their vehicles plugged in.

The company offers models serving three or six vehicles per unit. In a standard installation, one Level 2 charger serves all the connected vehicles. Larger properties can use multiple units, each supplied by its own circuit.

For buildings with limited electrical capacity, this offers another way to provide charging without necessarily upgrading their electrical service.

Of course, every building is different, and there are other approaches to sharing electrical power.

But how do you charge people for the electricity?

That’s a question Ernesto has been hearing from prospective customers.

EVPowerRouter manages electrical distribution, but the current product doesn’t include a system for calculating individual charging costs or billing drivers.

That’s one of the reasons Ernesto reached out to me.

At EVnSteven, we’ve developed a different piece of the EV charging puzzle: simple, affordable usage tracking and billing without electricity meters.

We developed EVnSteven in nine months and launched it three years ago. Since then, the platform has operated reliably, with new users signing up and configuring their own charging stations independently. Our involvement is largely limited to routine maintenance and occasional support requests.

The app allows drivers to report their charging sessions while property managers establish hourly rates, review usage, and receive automatically generated monthly bills.

We don’t measure electricity consumption or process payments. Instead, we rely on reported charging time, agreed-upon rates, and a little trust between people.

Because EVPowerRouter delivers electricity only during scheduled windows, those schedules would need to be accurately reflected in EVnSteven’s session reporting.

The two products aren’t integrated, but Ernesto and I discussed how they might complement each other.

Different approaches, shared opportunities

My own interest in EV charging has focused on making low-power charging available continuously wherever vehicles are parked.

Ernesto has taken a different approach, using scheduled periods of higher-power charging.

Neither approach is necessarily right for every situation. The best choice depends on the building, its electrical capacity, and the needs of its drivers.

We’re both small companies working in a very large market, and there’s plenty of room for different ideas.

I enjoyed learning about Ernesto’s invention and wish him success as he brings it to market.

You can learn more about his product at evpowerrouter.com and about our approach to tracking charging costs at evnsteven.app.

David Williston Founder, EVnSteven