Dynamic Load Controller DLC-5500

Energy Management for Photovoltaic Systems

See How it Works

How it works

The DLC module enables WiFi control of a high powered resistive load. WiFi communication enables control from anywhere within the WiFi network. Designed with a modern RESTful interface the module can be easily controlled by your favorite programming language. Solar Diversion
SolarOp Optimizing Solar PV Systems


The DLC’s solid state relay (SSR) provides real-time control of the resistive load. Designed to operate without Internet connectivity, no cloud or service subscriptions are required for its use.

An integrated thermal management system makes use of a fan to ensure that the internal temperature remains within the operating temperature range under varying load and a range of external temperatures. In extreme cases, such as when the ambient temperature prevents the system from cooling sufficiently, the system will automatically reduce power to keep the temperature within the operating temperature range.

An optional digital temperature sensor can be used to monitor and provide feedback for a control system.

SolarOp DLC Diagram


  • Designed for resistive loads
  • 90 – 260VAC, 23A 5500W continuous load
  • Ambient temperature range from -40C to 35C
  • Optional external digital temperature sensor (OneWire)
  • 802.11 WiFi b/g/n with WPA2 Personal Security
  • Wireless Software update
  • mDNS support – Use a name to refer to each DLC device on your network
SolarOp Dynamic Load Controller 5500

Use Cases

Here are some typical use cases

Home Brewing

Home Brewing

Use the DLC module to handle heater element control for your home brewing system. The optional digital temperature sensor lets you monitor the tank temperature.
Water Heater

Electric Water Heater

Manage a water boiler via WiFi.
Solar Diversion

Solar Diversion

Save money by redirecting excess solar energy to heat hot water or air.

Solar Diversion

Make use of excess solar energy

SolarOp Engergy Flows to Grid

Energy flowing out from the house to the grid

Your electricity provider may not have 1:1 net metering, where generated energy is banked for future use. Without 1:1 net metering exported energy is often credited at a lower rate than it costs to buy it from the grid. During the day excess solar energy is credited. During the evening hot water usage or air heating results in energy being bought back at a higher rate.

SolarOp Energy Flows to Heater

Energy flowing through the DLC module into heater

If the excess solar energy could be used when it was generated this could reduce or avoid buying the same energy back from the grid at a later rate. The DLC module's real-time control can be used to divert exactly as much excess solar energy as is being generated.


Installing the DLC module

  • Mount the housing using its integrated flanges
  • Wire the DLC in-line with the load you are looking to control
  • Power the device up and connect to the DLC's self hosted WiFi access point with your mobile device or computer
  • Configure the device, check its status or perform software updates directly from a web browser
  • The DLC will automatically connect and reconnect to your configured WiFi network

API Interface

Programmatic Interface via RESTful API

SolarOp API Interface
SolarOp API Interface

The DLC module has a full range of REST interfaces. For more information checkout the API guide.


Secure Wireless Interface

The DLC device was designed with security in mind. It supports 802.11 b/g/n and uses WPA2 Personal Security.
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