Watt Analytics GmbH

Frequently Asked Questions

About the Watt Analytics system, the meter or installation

Questions and Answers

Here you can find frequently asked questions and answers about our Watt Analytics System.

Questions About the intelligent Meter

Where do I find an electrician, who is able to install the Watt Analytics meter?

To install the meter, you can instruct any electrician in your proximity. A corresponding installation manual will be enclosed to your meter or you can download it here . The electrician's workload should be about one hour.

Can I install the Watt Analytics meter by myself?

Principally, you can also install the watt-meter yourself by using the enclosed installation instructions . However, we advise you not to install it by yourself unless you are a trained electrician and have appropriate experience with the handling of electrical installations.

Which measuring device should I buy? The iWattMeter or the SmartPI?

The iWattMeter is the right choice if you want to measure and analyze your electricity consumption and you don't have a photovoltaic system.

The SmartPi is the right measuring device for owners of a PV system. With the SmartPI you can not only analyze your total electricity consumption, but also control your devices to optimize the self-consumption of your self-produced electricity.

My watt-meter is no longer sending data. What can I do?

If your iWattMeter is not sending data anymore, it's most likely that it has lost connectivity to your local Wi-Fi network. Please open the Watt Analytics app and follow the instructions there to restore the Wi-Fi connection. If that does not work, then please send us a short e-mail, we will contact you to resolve the issue.

Does the watt-meter need to be serviced?

No, the iWattMeter is completely maintenance-free and is characterized by durability due to its robust construction.

Where can I buy the watt-meter?

You can purchase the watt-meter via our homepage.

On the page "Meters" I get to the Enerserve website. Who is Enerserve?

The company Enerserve is the manufacturer of the SmartPi. We are their sales partner and have expanded the SmartPI with our Watt Analytics NILM Software. Our software is thus an extension of the existing measuring device and is available and compatible for all customers who own a SmartPI, regardless of which seller the measuring device was purchased from.

Can I also use the Watt Analytics Software free of charge if I buy the SmartPI from the manufacturer Enerserve?

Yes, our software is available for everyone to download free of charge, including all the features that the Watt Analytics System offers, from teaching the devices to using the Watt Analytics Web App and Mobile App.

Can I take the watt-meter with me when I move?

Congratulations to your new home! Yes, you can take the watt-meter with you when moving. But please have it removed and reinstalled by a qualified electrician. In the new apartment, you may need to update the Wi-Fi settings within the Watt Analytics app after having installed the watt-meter. Just follow the instructions in the app.

What could be the cause and what can I do if the measuring device obviously shows incorrect or negative measurement data?

If the meter shows incorrect or negative measurement data, there could be various reasons. In this case, check the following 3 points:


  1. Check the direction of energy flow: Are the current transformers installed in the direction of the arrow? The arrow must point from the energy supplier to the consumer. Twisting the clamps leads to a negative measurement result.
  2. Is the current transformer cable properly connected to the meter according to the color code?
  3. Check whether the installation of the consumer itself is correct. This can be measured with a multimeter.

Here is an example of how to install the SmartPI for measuring a Tesla charging station:


The installation of the charging station should look like this:


Supply line to FI output = 3-phase + N

Lead to LSS = 2 phase + N

iWattMeter Voltage Input = L1 / L3 / N


If for example the outer conductor L2 is missing or if the N conductor is incorrectly connected instead of the L2 conductor, this leads to an incorrect or negative measurement result. The problem can be resolved by correcting the installation and actually connecting the meter to L1 / L3 / N.

Questions About the Watt Analytics System

How much electricity does the Watt Analytics system need?

This issue has to be split into two questions. How much power does Watt Analytics use at your home and how much electricity does our company consume in total?

The power consumption of Watt Analytics in your home depends on the watt-meter used. iWattmeter and SmartPI are economical meters. The power consumption can be compared to an energy saving lamp. In addition, you have to take into account the power consumption of your Wi-Fi network and your mobile phone but, of course, you might also use it for other purposes.

In the current start-up phase the power consumption of Watt Analytics is not yet relevant. But together with our cloud providers we try our utmost to gather corresponding data. As soon as we reach a critical size, our next step will be to optimize our office infrastructure with Watt Analytics. Of course, you can then take the corresponding report from our homepage.

Is the total power consumption per hour or maybe even per minute measured and evaluated?

The power consumption is measured and analyzed 4x per second. We show you the measurement data in our web app - on the dashboard of your user account - and in the mobile app.

Watt Analytics does not recognize my electrical device. What can I do?

We are constantly striving to extend our analyzer. It may occur that a particular device cannot be recognized due to its different behavior compared to what we have analyzed so far. Please open the protected area of the homepage and check the expert training mode in the dashboard. This might be of use to you. If this does not solve your problem, just send us an e-mail and we'll take care of it.

How much data is transmitted via the WLAN and does that affect my telecommunications costs?

4 times per second we send a short data record to the Watt Analytics Server. This does not have any impact on the performance of your wireless network and is most probably covered by your basic set of free data.

What data are collected from the Watt Analytics system?

Only if we learn from the data of others and make our data available to other members our Watt Analytics Community can be effective. Transparency and the way we handle your personal and recorded data is very important to us. Learn more about our data protection.

Which compatibility requirements must be met on my phone, tablet or PC?

Watt Analytics works with all major iPhones and Android phones. You can run the Watt Analytics app on all popular iPads and Android tablets. To operate the PC a standard internet browser is sufficient.

Is there a recommended household size or a specific level of energy consumption to be reached in order to ensure a profitable purchase?

Based on our experience Watt Analytics can already record interesting saving potentials in a single household. Of course, saving potentials increase with the size of the household. Watt Analytics can be operated in single and multi-family homes. Even for small and medium-sized companies, Watt Analytics can achieve a meaningful optimization.

Is there a support or a hotline that I can contact in case of challenges?

We are still in the start-up phase. If you have a problem, please send us an e-mail. We'll get back to you.

Is there a state subsidy for the purchase of a measuring device?

This is an interesting question. On existing relevant websites you can find corresponding funding programmes from the public sector. But we still have to check these programmes. Should you have more experience on this topic, we would be grateful if you could bring it to our attention.

Can I deduct the cost of the watt-meter for tax purposes?

This is an interesting question. We have to check that. Should you know more about this topic, we would be grateful if you could bring it to our attention.

Questions about device recognition

What is the minimum amount of watt that the meter can recognize?

Our measuring device can recognize and analyze devices from a consumption of 5 watts. Devices with a consumption below 5 watts cannot be recognized.

Can all devices be recorded with the training process or are there devices that cannot be supported by the system?

Basically, there are three categories of devices:


1. Category:

Devices that have switching on and off processes with a fixed wattage can be taught in well. This device category accounts for approximately 80% of consumption. These include following devices:

LED and halogen lamps, light bulbs, kitchen appliances such as ovens, hobs, dishwashers, refrigerators, freezers, coffee machines, toasters, steamers, vacuum cleaners, washing machines, dryers, heating systems, circulation pumps, drills, circular saws, compressors, grinders, garage door operators


2. Category:

Devices with a consumption between 5 and 15 watts. In principle, these devices can be taught. Since these devices are mostly found in large numbers in one household (e.g. light bulbs and chargers) and they hardly differ in their active and reactive power, our system cannot always reliably assign the corresponding pattern recognition to the respective device. If two very similar devices are connected to the same phase, there may be confusion. If two very similar devices differ by 10% or they are connected to different phases, the device detection works. For a clear assignment, a difference in consumption of approximatley 10% is necessary so that our analyzer can differentiate between the devices.

This device category includes:

NAS, DECT phones, printers, UPS, switches, receivers, satellite distributors, chargers for tablets and cell phones, electric toothbrushes, various routers and gateways for various applications, e.g. Fritz box or Coqon heating control, bell system, radio (also old tube radio).


3. Category:

Devices with dynamically fluctuating consumption. These devices can be trained, but error detection can occur if other devices with similar consumption are still hanging on the same phase. This device category accounts for approximately 10% of consumption. These include Food processor, PC, monitor, TV

How does a device training process work?

You have to switch the device on and off 3 times. Everytime you switch the device on again you have to mark the consumption (confirm the device) in the mobile app. Watch our video on teaching devices in the Watt Analytics App at the following Youtube-Link.

Do I have to train all devices individually and one after the other in the app?

Yes, it makes sense to train each device individually in the app if possible, so that there are no overlaps in the pattern recognition. This increases your device detection rate.

What happens to devices that cannot be trained? Are these still taken into account in the analysis?

Yes, all devices that have not yet been trained or cannot be recognized by the system are shown as "Unknown" in total.

Can I plug an adapter into individual devices that cannot be trained, e.g. my PC / NAS (Network Attached Strorage) etc.?

We plan to implement this option later this year.

Can I clamp a reader (current transformer) around the cable of individual fuse, so that I can e.g. read out my boiler room and my office completely?

Yes, that works. The 3 readers are intended for the 3 phases, but you can also attach the readers to each circuit. If you e.g. equip 9 circuits, you need 3 iWattMeter with 3 readers each. We do not currently offer any expansion modules for this.