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Thornwave Labs Inc.
$119.00
PowerMon is a Bluetooth hi-tech device that can be used to monitor the state of charge of any battery and power flow in any electrical system. The data logging function allows it to store measurements for up to 3 years (coming soon as a firmware / app update).
On top of the monitoring functions, PowerMon can act as a power controller, allowing for low voltage disconnect, high voltage disconnect, over-current disconnect, battery isolator, remote ON/OFF switch, timer switc. . .
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PowerMon is a Bluetooth hi-tech device that can be used to monitor the state of charge of any battery and power flow in any electrical system. The data logging function allows it to store measurements for up to 3 years (coming soon as a firmware / app update).
On top of the monitoring functions, PowerMon can act as a power controller, allowing for low voltage disconnect, high voltage disconnect, over-current disconnect, battery isolator, remote ON/OFF switch, timer switch, generator control, and solar system automation. With Bluetooth LE (Smart) connectivity there is no need for drilling and extra wiring in existing or new applications (RVs, boats, solar systems). Small form factor and ease of installation make PowerMon ideal for quickly adding smarts to any existing electrical system. Remotely monitoring DC circuit parameters has never been easier!
Voltage, current, power, energy, battery state of charge, and temperature are all measured and displayed in real-time using Thornwave Labs’ mobile application, PowerMon, which is offered for free on Google Play and Apple App Store. The device supports multiple configurations and measurement ranges that can be set up using the app, allowing it to accommodate a variety of circuits. Control of a mechanical or solid-state relay allows it to be used for low voltage disconnect, high voltage disconnect, over-current disconnect, a battery isolator for multiple battery systems, remote power control, or as timer. This wireless, multi-function tool is truly a Swiss-army knife for DC electrical systems.
The device measures two voltages up to 75V with better than 0.5% accuracy. It contains an internal shunt making it able to measure current up to 60A without using any external parts. The current measurement can be calibrated to an accuracy better than 1%. If higher current has to be measured (as high as 10,000A), an external shunt can be added. Current shunts are readily available and can be customized for the specific current measurement range required. PowerMon supports a wide range of current shunts.
I've been searching for a safe and relieable power monitor for quite sometime without spending an arm and a leg. This product suits my needs just well in such a small, clean and safe package. Easy to install and great instructions.
Easy to install and great support! So far, so good!
I now have five Thornwave devices monitoring systems on my boat - well engineered and great Bluetooth performance. I only wish support was as great as the products - have sent two requests for information without a single response - hoping it is just because of the COVID-19 situation...
I have a class A RV and preping it for installing an inverter that hasn't had one. I e-mailed Thornwave before hand and received quick and complete responses to my questions. I installed the shunt on the battery negative side. I have 2 flooded, lead-acid, 6V golf cart batteries in series and are located under the mid entery steps. To be extra careful to avoid any electrical shock to the battery monitor, all wires were connected to the terninal plug and then it was plugged into the battery monitor. Everything worked fine after turning on the location and bluetooth on my android phone. The app showed the data quickly and live on my phone and it also worked on my tablet.
Great so far. The zero current offset of 0.17A feels rather high, but is easy to reset to zero. Unfortunately I still cannot determine what causes a reset to be needed, although cycling the power often does reintroduce the offset. I am also somewhat disappointed that all values and many settings are reset when the power is lost, which is not normal in devices like this. Most others, often costing less than $25 have nonvolatile memory for cumulative readings. Strangely, the shunt resistance calibration is not reset, so there is some persistant memory. It would be great if offset and the recorded values were retained. I am hoping that the firmware update bringing data logging will implement this.
