Battery Monitor vs Bluetooth Module: What's Best to Monitor Your System?

Battery Monitor vs Bluetooth Module: What's Best to Monitor Your System?

By David Hutchison and Shari Galiardi
David Hutchison and Shari Galiardi
renogys blog Dec 30th 2019

With all the decisions necessary in installing a solar powered system, the last thing that may come to mind is a monitoring device. But once you begin collecting, storing, and using solar to power your life, you’ll want to keep tabs on how your new system is working. This information can be helpful in learning what your system can do.

Before 2019, we had a very simple battery monitor which only displayed the voltage of our battery, from which we extrapolated its status. We lived with this for about 6 years before installing the Renogy 30A Wanderer Charge Controller with the Renogy Battery Monitor and we recently upgraded to all Renogy components for our solar powered system. 

Two Options for Monitoring Your System

Renogy 500A Battery Monitor

Compatible with any type of battery, this unit connects to a shunt linked between the battery, charge controller, and an inverter. After correct calibration, it effectively monitors the amperage flowing out of the battery bank as well as the  battery charge status -- displaying that information on a LCD screen. It will also indicate, based upon the load, the time to charge or time to discharge. This unit measures 3.9 x 2.4 x 0.7 inches.

Renogy BT-1 Bluetooth Module

This module also works with any type of batteries but is only compatible with select Renogy charge controllers. Via a  downloadable app, and quick set up, you can use your smartphone or tablet to monitor the wattage coming from your panel(s) and battery charge status, without getting up from your hammock. 

Best Applications

The Battery Monitor is a good idea for anyone without a smartphone, or who doesn’t mind needing to stay close to their system in order to keep tabs. Additionally this monitor will work with any battery type and nearly any solar components regardless of make or manufacture. If you have a collection of components or are upgrading only a few, this might be your best option. This monitor can also work with all sorts of other battery applications, such as golf carts, electric scooters, medical devices, etc.

The Bluetooth Module caters to anyone with a smartphone or tablet, and those who want a bit more freedom in how they keep tabs on their system. It is also compatible with any battery type. Within a range of around 50 feet, you can see your system’s performance. In addition, the BT-1 allows users to see historical performance data, as well as alter charge controller settings (on  Rover Charge Controllers only).

Ease of Installation

The Battery Monitor is slightly more complicated to install because it uses a shunt (included) which needs to be connected to the negative terminals between the charge controller, battery bank, and inverter. The LCD screen is connected via an insulated wire, giving you some freedom to install the monitor in an easy to see location, rather than just keeping it in your battery compartment. If installing on a wall or in a cabinet within your RV, you will need to be able to fish the wire through to your battery or electronics compartment.

The Bluetooth Module is very simple to install. Just secure the unit near the charge controller, then connect it using the telephone jack outlet on the controller. There is no LCD screen on the unit itself, as it sends information about your entire solar powered system to your smartphone or tablet via the free downloadable app. There is no need to fish wires through a wall or cabinet, just open up the app, enter the provided password, and start monitoring.


The Battery Monitor only monitors the battery status; it is not intended to keep up with stats for the other components within your solar powered system. Because of the wired connection, if the included line is not long enough to reach your ideal install location, you will need to splice on additional line.

Since the Bluetooth Module is not weatherproof, it is not currently compatible with solar suitcases with built-in charge controllers. Also, the current app will not let you change the temperature settings from Celsius to Farenheit. Finally, the load monitoring function of the BT-1 app will only work if your charge controller has a load terminal (which is currently available on select charge controllers listed above). Thus, you may consider how much of your system you want to monitor before choosing a charge controller. Contact Renogy Tech Support for more information, as their line of charge controllers is always being updated and upgraded.


At more than twice the price, the Battery Monitor ($99.99) is more expensive than the Bluetooth Module ($39.99) and downloadable app (free) for keeping tabs on your solar equipment.

We’ve truly enjoyed the ease and simplicity of the Bluetooth Module and free downloadable app, giving us just enough information to keep tabs on our system; but, more technically-minded people may lean toward using the Battery Monitor for sake of charge specificity and programmability. Your rig, system, and lifestyle, will likely lead your to one or the other these monitoring methods, but neither will let you down.

If we’ve inspired you to go solar with Renogy, please use our affiliate link and promo code “canlife.” You will get a 10% discount and we will get credit for the sale. It’s win-win! And, as always, contact us directly with any questions. We love to hear from our readers!

Shari Galiardi & David Hutchison have turned their higher education backgrounds, desire for life-long learning, and thirst for adventure travel into writing, photography, video production, and public speaking tours from coast to coast. Known to their friends as simply Shari & Hutch, you can learn more about their full-time, solar powered adventures on their website at Or, follow them on Facebook, Instagram, and YouTube as “Freedom in a Can, LLC.” Note: All links contained within this blog contain affiliate links provided by Freedom in a Can.

See other related articles at Renogy:

Solar Panels 101: A Beginner's Guide

The Ultimate Guide To DIY Off-Grid Solar Systems

How many watts to run a house

Do solar panels increase home value

how efficient are solar panels

How long do solar panels last

How Many Solar Panels Do I Need