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

On-Grid Solutions

PV Plant Monitoring

Connect multiple inverters and energy meters along with weather sensors such as irradiation, wind speed and temperature to keep track of plant performance through the Wattmon EMS cloud. Our platform supports most inverters and power meters out of the box, and can be easily customized to work with new ones.

Zero Feed In / Zero Export

For plants that have restrictions on energy exporting, our solution allows you to dynamically control output power on all inverters in the system – on a single device or across multiple rooftops and ensure that no power is exported to the grid while maintaining maximum generation from solar.

DG Protection

Solar plants can now be run together with diesel generators by controlling solar generation to ensure a healthy minimum load on the genset. This increases fuel efficiency and means your solar plant does not need to remain idle during those power cuts!

Off-Grid Solutions

Battery monitoring

Keep track of the state of charge of your battery bank and understand charge / discharge profiles.

Solar Pumping

Connect to a VFD and keep track of solar generation and water volumes pumped to ensure proper functioning of remote solar pumps.

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
Communicate over TLS1.2 encryption over HTTPS and MQTTS
Industry Compliant Communications
Integrate new and existing devices easily using Modbus RTU & and Modbus TCP, as well as custom protocols
Local Storage
Securely store your data locally, control who can see it
M2M & Cloud Ready
Use Machine to Machine (M2M) protocols to upload data to your own server or use our advanced EMS portal
Write your own scripts in a built-in editor using uPHP or our blockly-based visual code editor to extend functionality
Multiple Network Protocols
Multiple Network Adapters
Connect through Ethernet, 2G, 3G and 4G (via dongle) and Wi-Fi (M2 Only)

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

Battery Monitoring

Wattmon has built-in features for battery monitoring, and with a few configuration settings you can keep track of a battery bank with voltages ranging from 12V DC to over 300V DC. For low voltages below 60V DC (a 48V battery bank) Wattmon can be directly connected to the batteries via the cable provided, and voltages will be measured from the same cable. For higher voltages an additional power adapter is required.

How does it work?

There are various ways of determining the remaining capacity in a battery. One of these ways is called Coulomb Counting. Another uses voltage to determine the remaining energy. A third method will actually check the specific gravity of the battery liquid to determine the state of charge.

Wattmon monitors inbound and outbound current from the battery bank and uses the Coulomb Counting method. Current flowing through the sensors is read once a second and accumulated in registers.  By configuring the total capacity of the battery, an accurate view of remaining energy is then calculated by subtracting and adding from this value. 

For example: 

A 100 Ah (Ampere hour) battery will be (theoretically) able to supply 10 Amperes for 10 hours (10 A/h * 10h = 100 Ah).  If you take out 10 A for 1 hour, Wattmon will show your battery State of Charge (SoC) as 90%.  If you then charge the battery at 10 Amps for 30 minutes, the battery will show 95% full (90 Ah + 5 Ah).

The Algorithm

Wattmon lets you set the various parameters in the Control Panel. Wattmon will reset the battery status to full when the battery voltage is higher than the 'full voltage' threshold (adjustable) and the current drops below a specific value (adjustable) for a set period of minutes (adjustable). This flexible set of options ensures that most requirements can be easily met.

Different battery chemistries have different efficiencies. You can enter the charge efficiency if you desire to get even more accurate results. If you are using a lead acid chemistry, you can also enter the Peukert constant of your battery bank to get an accurate discharge profile for higher currents.
This method has in our experimental setups proven to be quite accurate. It is definitely more than sufficient to get a good overview of remaining energy.
The device will, based on the remaining energy and the average load over the last few minutes calculate the run time through a web interface from your PC or mobile.


There are many devices which claim to have an accuracy of below 1%. We claim no such thing! It is accurate when it comes to estimating the remaining capacity, however there are cases when it can be off by up to 5 or 10%. Lead acid chemistry is in general difficult to measure accurately. There are temperature differences and many other factors that will affect the state of charge of a battery.

The Hardware

In order to monitor a battery bank, you will require a WattmonPRO and a current sensor module.  Depending on the current you need, this could be the C252 (25A), C502 (50A) or C752 (75A) or the C100s (100A) modules. The two sections below explain how to connect up the system to monitor different types of setup.  Please note that if only one channel is required (for example when only using an inverter and no solar) the left channel of the current sensor module can be ignored.

Monitoring Battery Banks of Upto 48V DC

The following diagram shows the components required to monitor battery banks of up to 48V DC.

Diagram: Monitoring battery bank setups of up to 48V DC

Monitoring Battery Banks of Upto 330V DC

The following diagram shows the components required to monitor battery banks of up to 300V DC.  This requires an additional AC to DC or DC/DC power adapter to power the WattmonPRO device.

Diagram: Monitoring high voltage battery banks (up to 330V)

The battery ground needs to be tied to the power adapter ground. 

Tip: Using a switch mode power supply, you can connect the power adapter directly to the high voltage battery terminals.

View WattmonPRO Details

View C752 Dual Current Sensor Details


REI 2019 Coming Up!

We are excited to be participating in this year's renewable energy expo REI 2019 between 18 and 20 September at Greater Noida - this mega event is one of the largest in Asia and brings over 30,000 visitors and 1,400 exhibitors from around the globe.

Please visit us at booth 1.6 - right at the main entrance in hall 1.  We will be showcasing our power control solutions and officially releasing our new product - the Wattmon M2!

REI 2018

It's that time of year again!  We look forward to interaction with all of you this year at REI 2018 in Greater Noida (if you aren't already planning it - it's between September 18 and 20, 2018).   We have had a great year and expanded our support for inverters and power meters, perfected power control for both zero export and diesel generator protection, and most importantly we are going to be launching a new product as is our tradition every year!

So make sure to visit us at Hall 1 Booth 6 - right at the entrance on the right side!