Wattmon - Intelligent Remote Monitoring and Control

Wattmon helps you log data, monitor and control your devices over the Internet


Access your data over the Internet using any browser or smart phone


Log data and control your devices with automated rules - no programming required!


View intuitive graphs to understand and troubleshoot your system easily

Where can Wattmon be used?

Keeps track of remaining capacity and battery health with options to automatically control charging.
Interface with Inverters and Power meters to log AC energy - monitor your grid tie solar inverter production remotely.
Control devices around your home or company automatically. Meet the Internet of Things!
Remotely monitor your AC & DC solar pumps including water flow rate and power
Monitor solar energy production and DC energy generated
Monitor wind speed or energy generation from your turbine
Measure temperature, pressure, humidity, irradiation, wind speed, rainfall and more
Monitor telecom tower batteries and automate charging

Features & Benefits

Highly Versatile
Lets you customise device to your exact needs with intuitive interfaces
Easy To Use
Allows non-programmers to configure and automate things
Accessible from your phone, tablet and pc through our proxy server from anywhere
Industry Compliant
Integrate new and existing devices easily using Modbus RTU & TCP
Local Storage
Securely store your data locally, control who can see it
Cloud Ready
Upload data to your own server or use our advanced cloud portal
Write your own scripts in a built-in editor using uPHP to extend functionality


I don’t see anymore how it is possible to manage a solar system without the full monitoring and control provided by Wattmon, it is a small investment that makes the big one - of the solar system - finally 100% worth its value.
Didier / Auroville / India
I am very happy to be using a Wattmon; it is very practical and controls the charging, from the mains, of my battery bank during the night time, whenever the battery charge level falls below a certain level and stops the charging when it reaches another level. All these parameters are programmable and can even be managed remotely. As a result I believe my battery will have a longer and better life than otherwise. The Wattmon is being continuously improved and upgraded...it's a very necessary accessory to your solar power system.
Angad / Auroville / India
We have been impressed by the flexibility of the Wattmon, its simple programmability enabled us to use it for a complicated application that would otherwise have required designing our own device.
Mitra / Lumeter Networks / USA

How Can Wattmon Help You?

Versatile Solutions

Monitoring Hardware
Devices that let you get to your data remotely with minimal hassle
Cloud Portal
Find out how our cloud based portal can help you
Understand the Wattmon system quickly



                                                                              Application Note: Onewire Temperature Sensor


Installing Onewire Temperature Sensor

Wattmon lets you connect onewire DS18B20 temperature sensors which can be either purchased from us or from any third party. This guide explains how to connect and configure them.

Configuring Onewire Sensors with the RJ45 Cable

Onewire sensors can be plugged directly into the master module's device port or to either of the ports in any of the devices such as C752. The first step will be to make a network cable if you do not already have one ready. The following diagram, Fig. 1, shows the connections for making a network cable. The RJ45 cable's outer gray jacket will need to be stripped to expose the eight colored wires inside. Arrange the wires so that they lay brown/white, white/brown, green/white, white/blue, blue/white, white/green, orange/white, and white/orange (as shown in Fig. 1). With the wires laying flat and parallel, cut off any excess ends so that all of the wires are of the same length. Insert the wires into the RJ45 plug with the brown/white wire being the top when the tab is on the back. Crimp the plug.


Fig. 1: RJ45 Plug Colour Code


Connect your onewire temperature's wires to the RJ45 wires. The typical colour code for the 5V, data, and ground of onewire temperature sensors can be seen below in Fig. 2.

 Fig. 2: Onewire Temperature Sensor Wire Configuration


The 5V wire (typically red) will correspond to the brown/white and white/brown wires of the RJ45 wire. The data wire will correspond to the green/white wire of the RJ45 cable. The ground wire (typically black) will correspond to the orange/white and white/orange wires of the RJ45 cable. A

2.2 kiloOhm to 4.7 kiloOhm resistor will need to be placed with one end connected to the 5V wire and the other end connected to the data wire. This setup can be seen below in Fig. 3.


Fig. 3: Onewire and RJ45 Connections


Configuring Wattmon Online Portal for Onewire Devices

Once the wiring is set up, you can go online to your Wattmon portal to configure the rest of the device and check to see the sensor's recordings. Open your Wattmon portal, go to Control Panel, and then Onewire Settings. Click the blue “Scan” button near the top right. The onewire temperature sensor device should appear like in Figure 4 below (Right click & view image to see a larger picture of the figure).


Fig. 4: Completed Scan


To edit the settings of the device, click on “Action” and then “Configure” from the drop down tab. This will lead to the Configure Onewire page, shown in Figure 5, where you can name the device and assign specific roles to each temperature sensor.


Fig. 5: Configure Onewire


In this case, there is only one temperature sensor with this onewire device. In other cases, there may be five sensors corresponding to a onewire device, and all of these would be listed in the Configure Roles section.

A role can be assigned to each temperature sensor in the Configure Roles section. There should already be three temperature roles defined by default (can be found listed in Roles), and these will appear in the drop down tab of the Configure Roles section. If this is not the case, a temperature role can be created by going to the Control Panel, Roles, and “Add Role.” Be sure to assign the role to “Onewire: Device” in the Role Type section.

To have the temperature data recorded, go to Control Panel and then Data Collection. A list containing a group “KwH Log” should appear as in Figure 6.


Fig. 6 Data Collection


Click on “Action” and then “Edit.” This should lead to a page with a list of data points that are currently being recorded in regards to your Wattmon device. Click on the “Add” button. A new data point will appear at the bottom of the list. To specify this as the temperature sensor, choose “Device Variable” for the Value Type, “Temp 1” (or whatever role you specified for the first temperature sensor) for the Value, “*1” for the Scale, and “Max” for the Function just as it appears in Figure 7 below, and then click the “Add” button near the top right. Repeat this for however many temperature sensors you will be using.


Fig. 7: Adding Temperature to Data Collection


To have the temperature sensor data appear on the dashboard, go to the Control Panel and then Widgets. Click on the “Add Widget” button near the top right. A widget for variables will need to be created like in Figure 8.


Fig. 8: Variables Widget


Next, to have the temperature role and the current reading visible in the Variables widget, go to the Control Panel and then Roles. Edit the roles that have been assigned to the temperature sensor(s) so that the Display on dashboard reads “Yes” as in Figure 9. Repeat this for however many temperature sensors you are using.


Figure 9: Configuring Role: Temp 1


This should allow the temperature sensor to appear in the Variables widget on the dashboard as in Figure 10.


 Fig. 10: Dashboard


Wattmon Is Going to Intersolar 2017

We are going to be at Intersolar Munich (May 31-June 2) and look forward to meeting you all there at stall B3.472!

We will be showcasing our two existing products, the WattmonPRO and WattmonMINI and launching our newest product, the WattmonMEGA.

Cluster Management

The new Sync package in Wattmon allows multiple global variables to be synced between different devices in a virtual cluster. This opens up endless possibilities for distributed control based on data spanning large geographic areas. Devices can be configured to read or write multiple variables.

Zero Feed In

India does not allow grid feed in certain areas, and any energy fed into the grid is charged to the customer. Using WattmonPRO with the Sync package, it is possible to monitor the main incomer power meter with one Wattmon and transmit this data to the cloud and sync it to various rooftop grid tie setups across the campus. At user-definable intervals each Wattmon will receive the total energy being imported/exported and decide on the correct power limit for the inverters, either throttling or increasing production to ensure that all generated energy only goes to the campus and does not get fed back to the grid.

Global Settings

Another application could be to enforce global setting changes across multiple locations in situations where a large number of devices are deployed. For example, a street light controller’s switching time may need to be adjusted remotely and it would be impractical to connect to each controller manually.

How it works

Wattmon devices poll the sync.wattmon.com server periodically for updates to read variables using a unique cluster read key. It can read all variables or a selection. These variables are then updated into the Wattmon’s $_GLOBALS array making it accessible to the scripting language and actions. Additionally, a global sync array is created which also keeps track of the last update to the variable so the device can determine whether the data is current or not.

For write variable, the Sync package takes the values of the global variables and sends them to the server at fixed intervals using a unique write key.

The MAC address of each device is logged on the server, making it easy to debug the system.

The Sync API will be available in the 2.15 release of WattmonOS.