Thornwave Labs Inc.
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We developed the PowerMon device because we wanted an affordable, high-tech solution that you can use to monitor electrical systems. PowerMon can be used in RVs, campers, boats, solar systems, off-grid systems, or really anywhere you have a battery that you want to monitor.
PowerMon is a Bluetooth Low Energy device that measures voltage up to 72V, and current up to 60A using an integrated shunt and temperature. It then calculates power (W), energy (Wh), charge (Ah), battery stat. . .
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We developed the PowerMon device because we wanted an affordable, high-tech solution that you can use to monitor electrical systems. PowerMon can be used in RVs, campers, boats, solar systems, off-grid systems, or really anywhere you have a battery that you want to monitor.
PowerMon is a Bluetooth Low Energy device that measures voltage up to 72V, and current up to 60A using an integrated shunt and temperature. It then calculates power (W), energy (Wh), charge (Ah), battery state-of-charge (SOC %), and estimated time left on the battery. PowerMon keeps track of various statistics: minimum and maximum voltage, current, temperature, battery SOC, the total charged Ah, total discharged Ah, and much more. If you need to measure current higher than 60A (internal shunt rating), an external shunt can be used.
It doesn't stop here! PowerMon can drive an external relay (or SSR - Solid State Relay). You can use PowerMon as a low voltage disconnect, high voltage disconnect, over-current disconnect, temperature controller, LiFePO4 battery charge manager, as a timer device, as a remote ON/OFF switch, or for automatic generator control.
A very important feature of PowerMon is that it logs the data for up to 3 years in internal memory (as opposed to other similar products on the market). This means that you don't need to have a mobile device permanently connected to the battery monitor. Whenever you connect to PowerMon, the mobile app will download the data logs from the device.
Using the PowerMon app or the newer PowerMonX app you can view the measured data in real-time, the statistics, download the log data and visualize it as a chart, configure the device or even update the firmware in the device when new versions become available.
The small form factor and ease of installation make PowerMon ideal for quickly adding smarts to any existing electrical system. Bluetooth frees you from the need to wire your RV, camper, or boat. PowerMon offers a bonus second voltage input that you can use to monitor a starter battery or maybe the voltage coming from your solar panels.
Remotely monitoring DC circuit parameters has never been easier!
The Power Mon has all the features I wanted. The Bluetooth app gave access to a wealth of information presented in a beautiful format. The unit died after I made a change to the wire size and reconnected it but they sent me another one right away with no questions asked.
The latest PowerMonX works well. The support person won't reply to my emails - now that he has my money, I guess he's tired of my questions. Not a professional way to support a good product. I've found that, compared to my older PowerMon, the V1 and V2 voltage readouts are inaccurate by about a volt too high. I wish I could calibrate them. Also, I miss the ability to force battery SoC synchronization as in the original PowerMon.
I bought this for monitoring two different battery banks. Thsi is the only battery monitoring device I have found that can handle two. I can see the state of my battery banks to include data logging. It is very versatile and in my opinion, a terrific value for the price. It is very easy to install, configure and to use. On top of that, it is extremely small and compact allowing it to be installed just about anywhere. I am very inpressed with this little unit and it gets 5 stars.
Compared to the previous hardware/software versions I appreciate some improvements such as data logging & low temp disconnect. As with the prior versions this lacks the ability to define battery full/empty thresholds. For example if you only want to charge a 12 volt LFP battery to 3.45 volts per cell then the coulomb counter will never get reset. A couple of other glitches in the powermonx app I noticed are: 1) one time I could not get the app to connect to the device, I had to delete user data in the app to get it working again 2) one time the power & coulomb meter quit working, stayed at zero regardless of charge/discharge. Had to do a reset to get them working again. Hopefully over time these shortcomings & glitches will get resolved with a firmware update. Until then I would be reluctant to recommend it.
You cannot boondock/dry camp without a shunt, can't imagine full time RVing with this device.