Understand how our auto-switching technology manages power distribution between two 240V outlets from a single input.

The <a class="intercom-content-link" href="https://www.getneocharge.com/shop-pages/smart-splitters" target="_blank">Smart Splitter</a> provides two 240V outlet outputs from a single 240V input. With the Smart Splitter&#x2019;s auto-switching technology, power is fed to only one outlet at a time. With the Smart Splitter, multiple devices such as electric dryers, EV chargers, or electric water heaters can be operated from a single outlet, saving you thousands of dollars from negated electrical upgrades.&#xA0; The Smart Splitter functions by reading the total current draw coming from both receptacles and shutting off the Secondary side when the power draw exceeds the limit of the circuit breaker. After the Primary side finishes the session and the device recognizes that the total current draw is below the breaker threshold, it will then resume power to the Secondary.&#xA0;The Primary outlet always maintains an idle current which enables the device on the Primary to maintain enough power to run any LED display screens or Smart devices to stay connected to WiFi. The Smart Splitter is <a class="intercom-content-link" href="https://ul.org/" target="_blank">UL safety certified</a>, which means it is thoroughly inspected and tested by the leader in tech safety. Your safety and the quality of our products will always be our top priorities.Note: The Smart Splitter is a fully automatic device and requires no manual input.Use Case #1: Appliance and EV Charger. For example, let&apos;s say you want to share your dryer outlet to charge your EV. Your dryer would be plugged into the primary side and an EV charger on the secondary. Whenever you need to use your appliance, the Smart Splitter will automatically pause EV charging, run the load of laundry, and will resume when the appliance load is finished. In this case, most home setups would use either the <a class="intercom-content-link" href="https://www.getneocharge.com/shop/smart-splitters" target="_blank">NEMA 10-30 or NEMA 14-30 Smart Splitter&#xA0;</a>which can pull up to 24 amps/5.7 Kw.Use Case #2: Two EV Chargers. The same occurs when charging two EVs. The EV plugged in on the primary side will charge until it&apos;s fully charged, at which point the splitter automatically switches to fully charge your second EV.&#xA0;<hr>Switching Limits - Appliance x EVWith a 30A appliance and EV circuit, the Secondary (EV) side of the Smart Splitter will get shut off once the Primary (appliance) begins to pull enough power to cross the switching threshold of 10A.&#xA0; When an EV is already charging and the appliance turns on, it may take up to a minute for the appliance to pull enough power for the total current to exceed 30A and then shut off the secondary. In this case, the switch is typically not instantaneous but will take a moment before shutting off the Secondary. *Some heat pump dryers are very efficient when run on &quot;air-dry&quot; or &quot;fluff&quot; modes and will only pull 2 - 3 amps.&#xA0;This is not enough to exceed the switching threshold and will be okay to run both the appliance and EV simultaneously. <img src="https://attachments.gorgias.help/8zoo/hc/jra5/ezgif.com-video-to-gif%20(3)-d792d67c-3df2-41c7-b202-fbbe30e95bb7.gif" style="width: 583px;" class="fr-fic fr-dii"><hr>Switching Limits - Dual EVWith a 50A circuit for dual EV charging, the Smart Splitter offers two charging modes: sequential and simultaneous. In sequential mode, the Secondary (SEC) side of the Smart Splitter will shut off when the total power draw exceeds 44A (the switching limit). The Primary EV will charge at full power (up to 40A), and once it completes charging or stops drawing power, the Secondary EV will automatically begin charging.For simultaneous charging, both EVs must be set to 20A or less to stay under the switching limit. When properly configured, the Smart Splitter will allow both EVs to charge at the same time, effectively splitting the available power. When the Smart Splitter detects that the combined draw is within safe limits, it will maintain power to both outlets. Changes in charging state may take up to 60 seconds as the Smart Splitter monitors total power draw.*Note: For 30A circuits, simultaneous charging is not recommended due to the 24A maximum safe charging rate. These circuits should use sequential charging only. Always verify your EVs or EV chargers can adjust to these amperage levels before attempting simultaneous charging.<img src="https://attachments.gorgias.help/P4k1n6jALLxreOX9/hc/r1WE86rb816J4Mvg/2025020601-d2f1ed82-6094-48a1-983f-090374dbb1c5-ezgif.com-video-to-gif%20(1).gif" style="width: 634px;" class="fr-fic fr-dib fr-fil">

How Does the Smart Splitter Work?

From EV charging to appliance sharing, discover the wide range of compatible devices and applications for your Smart Splitter.

While the Smart Splitter is most commonly used to share an appliance and an EV charger, the device is not limited to specific applications but is instead intended to be a broad-purpose 240V circuit splitter. Common Use Cases:<ol><li>Appliance + EV</li><li>Dual EV</li><li>Multiple Appliance</li><li>On the Road (Portable EV Charging Access)</li><li>Other (DIY Builds and Tiny Homes)</li></ol><hr>1.) Appliance + EV&#xA0;The most common use case of the Smart Splitter is for sharing an existing appliance with an EV charger. &quot;Appliances&quot; is a broad term that includes almost all 240V plug-in devices:<ul><li>Dryer</li><li>Electric Range/Oven</li><li>Air Conditioner</li><li>Heat Pump</li><li>Water Heater</li><li>Welding equipment</li><li>Compressor</li><li>Sauna</li><li>Hot Tubs</li><li>Electric Fence</li><li>Pottery kilns</li></ul>In just about all of these applications, the Appliance will be plugged into the Primary side to take priority over the EV charger plugged into the Secondary.NOTE: If you are using a 30A circuit breaker, you will want to ensure that your EV charger has adjustable amperage capabilities to be set to 24A or less.2.) Dual EVThe other everyday use case of the Smart Splitter is plugging in two EV chargers for dual EV charging. This is most commonly done with the NEMA 14-50 model which allows for the chargers to plug in directly without the need for an adapter.3.) Multiple ApplianceAlthough most of our users use the Smart Splitter for EV charging, this is by no means a requirement for using the Smart Splitter. We have hundreds of users who use the device to share power among multiple appliances.&#xA0;If you are looking to use the Splitter in this manner, a common question we get is which appliance should get plugged into the Primary vs Secondary. As a general rule of thumb, the Primary side device should be the one that you need to manually turn on, and the Secondary should be the device that runs automatically. This ensures that the Splitter provides power to the device you are actively using and won&apos;t allow the Secondary device to suddenly turn it off. For example, you wouldn&apos;t want your oven to suddenly lose power in the middle of cooking dinner because of your water heater turning on.4.) On the Road (Portable EV Charging Access)The Smart Splitter is a small device that can very easily be plugged in and moved around if needed. Several Smart Splitter users simply carry one around as a portable means of gaining EV charging access while on the road. If you are traveling to a location you know has a 240V outlet with another EV or appliance plugged in, you can easily bring a Smart Splitter with you to gain access to Level 2 charging as you travel.This is a very common solution for RV owners who also own an EV and are often traveling and plugging into 240V at campgrounds. Most common: If you are visiting someone with an EV who has a NEMA 14-50 plug-in charger, simply bring your Smart Splitter and a portable charger along for the ride and share the Level 2 charging.&#xA0;5.) Other (Tiny Homes / DIY Builds)We are aware of a few dozen customers using the Smart Splitter in DIY builds such as tiny homes where the Smart Splitter is used to provide power to whole buildings through a single 240V line. We love seeing the creativity!

Use Cases: What Appliances Does it Work With?

Learn about the prioritized power distribution system between Primary (PRI) and Secondary (SEC) outlets for optimal device management.

The Smart Splitter features two outlets labeled &quot;PRI&quot; (Primary) and &quot;SEC&quot; (Secondary), each serving a specific role in the power-sharing system. Understanding these roles is crucial for optimal setup and operation of your Smart Splitter.Primary Outlet (&quot;PRI&quot;)&#xA0;The Primary outlet, marked &quot;PRI&quot; on your Smart Splitter, always takes priority over the Secondary outlet. This outlet maintains a small idle current to keep devices like dryers or smart chargers connected to their display or WiFi even when not actively running. When a device on the Primary outlet begins drawing power, it automatically receives priority access to the circuit&apos;s full capacity.Secondary Outlet (&quot;SEC&quot;)&#xA0;The Secondary outlet, marked &quot;SEC&quot;, automatically yields to the Primary outlet when needed. If the combined power draw would exceed the circuit&apos;s capacity, the Secondary outlet temporarily pauses until the Primary device completes its session.Recommended Device Placement:&#xA0;For Appliance + EV Setup:<ul><li style="font-size: 16px;">Primary (PRI): Connect your appliance (dryer, water heater, etc.)</li><li style="font-size: 16px;">Secondary (SEC): Connect your EV charger
This ensures your appliance can operate whenever needed without interruption.</li></ul>For Dual EV Setup:<ul><li style="font-size: 16px;">Primary (PRI): Connect the EV you want to charge first or most frequently</li><li style="font-size: 16px;">Secondary (SEC): Connect your second EV charger
This allows you to prioritize charging for your primary vehicle.</li></ul>Power Management:<ul><li style="font-size: 16px;">The Primary outlet can access the circuit&apos;s full capacity (within safety limits)</li><li style="font-size: 16px;">The Secondary outlet automatically pauses when needed</li><li style="font-size: 16px;">Switching between outlets may take up to 60 seconds as the Smart Splitter monitors power draw</li><li style="font-size: 16px;">Both outlets can operate simultaneously if the total power draw remains under the switching limit</li></ul>For optimal performance, use the NeoCharge App to monitor power usage and configure charging schedules that best suit your needs.

Primary vs Secondary Outlets Explained

A comprehensive guide to safely using NEMA adapters with your Smart Splitter for maximum compatibility with different plug types.

NEMA adapters allow you to connect devices with different plug types to your Smart Splitter safely. Here&apos;s what you need to know about using adapters correctly:Safe Adapter Usage:
The Smart Splitter&apos;s input and output receptacles must match your wall outlet type due to UL safety certification requirements. When your EV charger has a different plug type than your wall outlet, use an appropriate adapter to make the connection compatible.Correct Adapter Configuration:
NEVER connect an adapter between your wall outlet and Smart Splitter. Instead, use one of these safe configurations:<ul><li>Wall outlet &#x2192; Smart Splitter &#x2192; adapter &#x2192; EV charger</li><li>Wall outlet &#x2192; Smart Splitter &#x2192; EV charger (when plugs match)</li></ul>Example Setup:
If you have a NEMA 10-30 dryer outlet and an EV charger with a NEMA 14-50 plug:<ol><li>Purchase a NEMA 10-30 Smart Splitter (matches wall outlet)</li><li>Use a NEMA 10-30 to NEMA 14-50 adapter to connect your EV charger</li><li>Plug your dryer directly into the Primary outlet</li><li>Connect your adapted EV charger to the Secondary outlet</li></ol><img src="https://attachments.gorgias.help/P4k1n6jALLxreOX9/hc/r1WE86rb816J4Mvg/2025020602-cdbf690b-a18f-4679-9daf-3d5d0ca9a480-frame%20625582.png" style="width: 680px;" class="fr-fic fr-dib">Important Considerations:<ul><li>Always verify your EV charger can adjust to the appropriate amperage for your circuit</li><li>For 30A circuits, ensure charging is limited to 24A or less</li><li>Some EV brands have specific adapter requirements (refer to manufacturer guidelines)</li></ul>Compatible Adapter Types:
Most Common:<ul><li>NEMA 10-30P to NEMA 14-50R</li><li>NEMA 14-30P to NEMA 14-50R</li><li>NEMA 6-50P to NEMA 14-50R</li><li>NEMA 10-50P to NEMA 14-50R</li></ul>

Using Adapters

Explore our UL-certified safety features and rigorous testing standards that protect your devices and electrical system.

Safety is our top priority at NeoCharge!&#xA0;<span style="color: rgb(27, 28, 29); font-family: Inter; font-size: 16px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: left; text-indent: 0px; text-transform: none; white-space: pre-wrap; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; float: none; display: inline !important;">We went through a year and a half of testing with Underwriters Laboratories to get our cUL safety certification. We pride ourselves in the quality and effectiveness of our Smart Splitters and we&apos;ve had multiple charger and electric car OEM&apos;s test our product in-house and have been very happy with the results. Each splitter is tested for quality assurance and we currently have 20,000+ customers who have been happy with the fast charging they were able to receive.&#xA0; All Smart Splitters have built-in safety systems to prevent the total power draw from ever exceeding what your outlet can handle.&#xA0;The Smart Splitter conforms with NEC (National Electric Codes) regulations to ensure a 20% buffer for overcurrent. Under this regulation, the continuous load from a plugged in device cannot exceed 80% of the breaker rating.This works through our automated power switching technology which uses an outlet priority system. To put it simply, the Primary outlet (left side) takes priority over the Secondary outlet (right side), and when the Primary side pulls power, any active session on the Secondary side will automatically pause until the Primary is finished. When used with your dryer, the dryer would be plugged into the Primary (priority) and your EV plugged into the Secondary.Here is an example of what the auto-switching looks like:&#xA0;<ol><li style="font-size: 16px; font-family: Inter;">First, you&apos;re charging your EV on the Secondary outlet.&#xA0;</li><li style="font-size: 16px; font-family: Inter;">Then when you start your dryer, the Smart Splitter automatically pauses the EV charging, only allowing power to the dryer as it runs.</li><li style="font-size: 16px; font-family: Inter;">When the dryer cycle is finished, the EV automatically resumes charging.&#xA0;</li></ol><span style="color: rgb(65, 65, 65); font-family: Inter; font-size: 16px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: left; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; float: none; display: inline !important;">All of this is done automatically without you needing to do anything!&#xA0;The fully automatic system ensures that there is no need to worry about overloading your circuit or plugging and unplugging your devices.The Smart Splitter is cUL-certified in both the US and Canada. Underwriters Laboratories (UL) is the most widely recognized standard for electrical products.File number: *UL certificate E507438 FCC ID: 2AC7Z-ESPWROOM32

Safety Features and Certifications

Detailed technical specifications, dimensions, and operating parameters for all Smart Splitter models.

<table style="width: 100%;"><tbody><tr><td style="vertical-align: middle; background-color: rgb(209, 213, 216); text-align: center; width: 13.2072%;">Spec</td><td style="vertical-align: middle; background-color: rgb(209, 213, 216); text-align: center; width: 37.5795%;">24 amp models (NEMA 10-30, 14-30) </td><td style="width: 48.9812%; vertical-align: middle; background-color: rgb(209, 213, 216);">40 amp (NEMA 14-50, 10-50, 6-50)</td></tr><tr><td style="width: 13.2072%;">Output Power</td><td style="width: 37.5795%;">24A / 5.7kW</td><td style="width: 48.9812%;">40A / 9.6kW</td></tr><tr><td style="width: 13.2072%;">Input Voltage</td><td style="width: 37.5795%;">240 VAC nominal, single phase </td><td style="width: 48.9812%;">240 VAC nominal, single phase </td></tr><tr><td style="width: 13.2072%;">Input Current</td><td style="width: 37.5795%;">30A Circuit Breaker </td><td style="width: 48.9812%;">50A Circuit Breaker </td></tr><tr><td style="width: 13.2072%;">Input</td><td style="width: 37.5795%;">NEMA 10-30P or NEMA 14-30P</td><td style="width: 48.9812%;">NEMA 14-50P, NEMA 10-50P, NEMA 6-50P</td></tr><tr><td style="width: 13.2072%;">Output Outlet</td><td style="width: 37.5795%;">2x NEMA 14-30R or 2x NEMA 10-30R </td><td style="width: 48.9812%;">2x NEMA 14-50R, 2x NEMA 10-50R, or 2x NEMA 6-50R </td></tr><tr><td style="width: 13.2072%;">Dimensions</td><td style="width: 37.5795%;">5.25&quot; x 5.25&quot; x 2.8&quot; </td><td style="width: 48.9812%;">5.25&quot; x 5.25&quot; x 2.8&quot; </td></tr><tr><td style="width: 13.2072%;">Weight</td><td style="width: 37.5795%;">2.5 lbs</td><td style="width: 48.9812%;">2.5 lbs</td></tr><tr><td style="width: 13.2072%;">WiFi</td><td style="width: 37.5795%;">Yes</td><td style="width: 48.9812%;">Yes</td></tr><tr><td style="width: 13.2072%;">Designed</td><td style="width: 37.5795%;">USA</td><td style="width: 48.9812%;">USA </td></tr><tr><td style="width: 13.2072%;">Manufactured</td><td style="width: 37.5795%;">USA </td><td style="width: 48.9812%;">USA </td></tr></tbody></table> DimensionsThe device&apos;s dimensions are&#xA0;<span id="isPasted" style="color: rgb(65, 65, 65); font-family: Inter; font-size: 16px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: left; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; float: none; display: inline !important;">5.25&quot; x 5.25&quot; x 2.8&quot;, not including the pins protruding out the other side that will be inserted into the wall outlet.Several Smart Splitter users use the device as a portable means of accessing 240V outlets when traveling to visit friends and family, so the compact design is ideal for easy transportation.<img src="https://attachments.gorgias.help/uploads.gorgias.io/P4k1n6jALLxreOX9/Frame_625559_2-4306aed0-430f-4fed-bae7-a6cc07364887.jpg" style="width: 570px;" class="fr-fic fr-dib">

Specifications and Technical Details

Learn how to optimize charging for multiple EVs using either sequential or simultaneous charging modes.

<h2 id="isPasted">Dual EV Uses - Sequential vs Simultaneous Charging</h2>Beyond the auto-switching functionality of the Smart Splitter, you can also charge two EVs at half speed (typically 20 Amps each) if your EV chargers or EVs themselves have the ability to set custom current limits. Set the charger to half amperage and charge both of your EVs simultaneously at half speed. In this case, most home setups would use either the <a href="https://www.getneocharge.com/shop/smart-splitters" target="_blank">NEMA 14-50 or NEMA 6-50 Smart Splitter&#xA0;</a>which can pull up to 40 amps/9.6 Kw. <div data-block="true" data-editor="c6sl5" data-offset-key="9sgmp-0-0" style="box-sizing: border-box; -webkit-font-smoothing: antialiased; color: rgb(27, 28, 29); font-family: Inter, &quot;Helvetica Neue&quot;, Arial, Helvetica, sans-serif; font-size: 14px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: pre-wrap; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;"><div data-offset-key="9sgmp-0-0" style="box-sizing: border-box; -webkit-font-smoothing: antialiased; position: relative; white-space: pre-wrap; direction: ltr; text-align: left;"> </div>Simultaneous Charging <span style="color: rgb(27, 28, 29); font-family: Inter, &quot;Helvetica Neue&quot;, Arial, Helvetica, sans-serif; font-size: 16px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-transform: none; white-space: pre-wrap; word-spacing: 0px; -webkit-text-stroke-width: 0px;">If you would like to charge both of your vehicles at the same time, you will need to lower the total charging amperage of both vehicles to 40A or less. Typically this means setting the charging amperage of both vehicles to 20A, though you can go lower one or both as low as 16A if you experience any breaker-tripping issues. The Smart Splitter will automatically sense that the total power draw can be met by the supplying circuit and will divide the power accordingly to both EVs. <span style="color: rgb(27, 28, 29); font-family: Inter, &quot;Helvetica Neue&quot;, Arial, Helvetica, sans-serif; font-size: 16px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-transform: none; white-space: pre-wrap; word-spacing: 0px; -webkit-text-stroke-width: 0px;">Simultaneous charging will effectively lower the charging speed by 50% for each vehicle as they are only receiving half of the power. <img src="https://attachments.gorgias.help/8zoo/hc/jra5/ezgif.com-video-to-gif%20(2)-737d5e21-efe4-4d57-8fb1-ae302c4eca21.gif" style="width: 555px;" class="fr-fic fr-dii"> Sequential Charging If you would like to ensure that one of your vehicles receives priority and charges quickly, then you may prefer to charge your cars sequentially. Both vehicles can have their charging amperages set up to 40A, and when both are plugged in the Smart Splitter will recognize the total power draw exceeds the 40A limit and shut off the Secondary outlet. The Primary outlet will receive 100% of the power until that vehicle has finished charging and stops drawing power. Then, the Smart Splitter will automatically turn the Secondary outlet back on to charge the other vehicle. <img src="https://attachments.gorgias.help/8zoo/hc/jra5/ezgif.com-video-to-gif%20(1)-fef746ee-2301-4c33-8574-5c7844e6af68.gif" style="width: 553px;" class="fr-fic fr-dii"> How to set my charging current Some EVs, like Teslas, have adjustable charging functionality built directly into the car. These vehicles can have their charge current adjusted through the car&apos;s dashboard or through the companion app. <span style="color: rgb(27, 28, 29); font-family: Inter, &quot;Helvetica Neue&quot;, Arial, Helvetica, sans-serif; font-size: 16px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-transform: none; white-space: pre-wrap; word-spacing: 0px; -webkit-text-stroke-width: 0px;">Other EVs are designed to charge at 32A and don&apos;t have the ability to adjust the amperage themselves. If this is the case and you would like to be able to charge two cars simultaneously, you will need to purchase an EVSE with adjustable amperage.</div>

Dual EV - Sequential vs Simultaneous Charging

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Learn how your Smart Splitter works and discover its key features and compatibility options.

Smart Splitter Basics

Setting Up Your Smart Splitter (Installation Guide)

Smart Splitter Quick Start Guide

Smart Splitter Safety Guidelines and Cautionary Advice

Smart Splitter Mounting Bracket Guide

Understanding Smart Splitter Indicator Lights

Downloading and Setting Up the NeoCharge App

Getting Started - Smart Splitter