Smart Splitter vs Energy Monitor: Which Do I Need?Updated an hour ago
Overview:
Both products help you charge an EV at home without a costly electrical upgrade. They solve different problems: the Smart Splitter shares one existing circuit, and the Energy Monitor manages your whole panel so a new EV charger circuit can be added.
Smart Splitter: Share an Existing 240V Outlet
- Plug and play. Plugs into an existing 240V outlet, such as a dryer outlet. No electrician needed.
- Manages power on a single circuit. Two devices share one outlet, and the Primary side always has priority. When the Primary device draws power, the Secondary side automatically pauses.
- Best for: homes that already have a 240V outlet near where you park and want to share it between an appliance and an EV (or two EVs).
Learn more: How Does the Smart Splitter Work?
Energy Monitor: Add a New EV Charger Circuit Without a Panel Upgrade
- Electrician installed. The Energy Monitor is installed inside your electrical panel, with sensors on the service mains that measure your whole home's electricity use in real time.
- Dynamically throttles EV charging. Paired with a compatible OCPP charger (such as the Autel MaxiCharger), it forms a certified Energy Management System (EMS). When the house is using a lot of power, charging slows or pauses. When demand drops, charging speeds back up.
- Enables a new EV charger circuit. Because the EMS keeps total load within your panel's rating, an electrician can install a new EV charger circuit at the panel without a panel or service capacity upgrade. Those upgrades can cost thousands of dollars and take months of utility coordination.
- Needs physical breaker space. The new circuit needs room in the panel for a breaker. If there isn't any, an electrician can usually open up space by consolidating breakers (for example, with tandem breakers) or by adding a subpanel. Both are far less expensive than a panel or service upgrade.
- Best for: homes without a spare 240V outlet, or homes where a new EV charger would otherwise require a panel upgrade.
Learn more: Energy Monitor Installation Guide
Side-by-Side Comparison:
| Smart Splitter | Energy Monitor + EMS | |
|---|---|---|
| Installation | Plug and play, DIY | Licensed electrician, inside the panel |
| What it manages | One existing 240V circuit | Whole-home load at the panel |
| How it manages power | Switches between Primary and Secondary outlets | Adjusts EV charger current in real time over OCPP |
| Charger requirement | Any plug-in EV charger or appliance on a compatible outlet | Compatible OCPP charger (e.g. Autel MaxiCharger) |
| New circuit needed? | No, it uses an existing outlet | Yes, a new EV charger circuit is installed |
| Avoids panel upgrade? | Yes | Yes |
Can I Use Both?
Yes. They work independently on separate circuits. For example, a Smart Splitter can keep sharing your dryer outlet while the Energy Monitor manages a new, dedicated EV charger circuit. The Smart Splitter handles its own load sharing and doesn't need an EMS.
Still Not Sure?
Contact us at [email protected] and we'll help you pick the right setup for your home.