PowerMon-D4 - 4.3" Bluetooth Color Touchscreen Display

The PowerMon D-4 is a great tool in monitoring my RV’s battery bank. I have four LiFePO4 batteries and 4 solar panels. When camping off grid, you need to know what your batteries are doing as to adjust your power usage. Without the PowerMon D-4, I was blind and did not know my batteries current state of charge, and on several occasions lost power as the batteries were dead.

With the PowerMon D-4, I know when to cut back, when to put out panels and know exactly the state of charge of my batteries. This is an indispensable tool that it super easy to install and use. In combination with the PowerMon-5S shunt, I have a window into my RV’s power supply that shows me everything I need at my fingertips. I give it 5 stars and highly recommend it to anyone using solar with a battery bank.

I bought this to go in my travel trailer next spring. Currently, I am using it with two battery boxes I built and it works mostly as expected.

One thing I haven't been able to do is connect to my network. It is not an issue right now, but possibly in the future.

Did not work the way the wiring diagram showed. Had to talk with support and still did not get satisfactory answers. Turns out, for whatever reason, my 2004 HR has to be wired in reverse on the shunt to work properly - probably because of the wiring to the converter. Anyway, after hours of fiddling and finally taking the chance to reverse wiring, it works!

Excellent quality display and touchscreen. I already had two PowerMon battery monitors installed on my Class A coach. One allows me to monitor both the domestic and chassis battery banks while I have set up the other to monitor alternator demand/output along with chassis battery status. Installation and setup of the POWERMON-D4 is extremely simple. It only requires a 12VDC connection to power it and the Bluetooth connectivity to the monitors is super simple. The POWERMON-D4 Is also Wi-Fi enabled for firmware updates when needed. Settings for the PowerMon monitor/s are made through the PowerMonX app on your phone or tablet. I chose to install the POWERMON-D4 where it can be seen while driving so I can monitor the status of the domestic batteries, chassis batteries and the alternator output as we are underway. I would have preferred a snap in type of bezel for installation over the included hardware, but that is a very minor issue. Additionally, developer support has been excellent. I’m looking forward to future Thornwave products.

Initial assessment:

I've gone through an initial power-on trial without linking to the shunt.

The form and fit are really nice. I already have a spot chosen coincident with tank and electrical controls, and the footprint is small enough that it won't be difficult to install. The other displays also permit access to the back space so I don't have to install blind, and power is available there.

I really appreciate the broad range of input voltages. There have been problems with some fan control circuits failing when exposed to Lithium charging voltage 14.1 VDC, as the earlier designs needed 12 VDC under tight tolerance.

The display itself is really attractive, good brightness and good sensitivity to touch without being excessively so. The selections are clear and logical. It was very easy to connect to WiFi to check for software updates. Display controls are good and logical.

The manual is easy to understand. I didn't need it for the initial power-on tests as it was clear and logical how to do things.

I'll post an addendum once I've linked to the shunt.