Keep Tabs on Your RV Battery: Top Wireless Solar Monitors
The Victron Energy SmartShunt stands out as the top pick for RV owners who want precise state of charge data and solar input monitoring without a display. It connects via Bluetooth to your phone, making it easy to check battery status from anywhere. Its main limitation is that it requires a separate solar charge controller to track solar input fully.
When you’re parked off-grid, knowing your battery’s state of charge is crucial. A wireless solar RV battery monitor lets you check voltage, current, and power consumption from your phone without running wires through your RV.
These monitors use a shunt to measure current in and out of your battery, and many now include solar input tracking to see how much power your panels are generating. We compared popular models based on specifications, user feedback, and compatibility with common RV battery types.
Our top picks
Victron Energy SmartShunt 500A/50mV
The Victron SmartShunt is a Bluetooth-enabled battery monitor that measures voltage, current, and power. It calculates state of charge using Peukert’s formula, providing accurate readings for lead-acid, AGM, and lithium batteries. It has no display, so you rely on the VictronConnect app, which shows a wealth of data including solar input if you also have a Victron solar charge controller.
Pros
- High accuracy with programmable Peukert exponent
- No display needed; works entirely via app
- Can integrate with Victron solar controllers for solar data
Cons
- Higher price point
- Requires separate solar charge controller for solar tracking
Renogy 500A Battery Monitor with Shunt
Renogy’s 500A battery monitor is a popular choice for RV solar setups. It comes with a shunt that measures current in and out, and the display shows voltage, current, and power. It does not have built-in Bluetooth, but you can add the Renogy BT-2 module for wireless monitoring. Many owners pair it with Renogy solar controllers for a complete system.
Pros
- Affordable and reliable
- Expandable with Bluetooth module
- Wide voltage range supports various battery banks
Cons
- Bluetooth module sold separately
- Display can be less intuitive than app
BMON Battery Monitor with Bluetooth
The BMON battery monitor is designed for larger RV battery banks, handling up to 500 amps. It includes Bluetooth for wireless monitoring and works with both 12V and 24V systems. Users appreciate its clear display and app that shows voltage, current, and amp-hours. It also records historical data.
Pros
- Handles high current for larger rigs
- Built-in Bluetooth at a reasonable price
- Data logging for trend analysis
Cons
- Some users find the app interface basic
- May require calibration for lithium batteries
AiLi Voltmeter Ammeter Battery Monitor
The AiLi battery monitor is an inexpensive option that provides essential information: voltage, current, and power. It comes with a 100A or 350A shunt and a small display. It lacks Bluetooth, but for the price, it’s a solid choice for RVers who want to monitor their battery without breaking the bank. Many use it with solar setups to keep an eye on charge.
Pros
- Very affordable
- Simple to install and use
- Accurate enough for basic monitoring
Cons
- No wireless connectivity
- Limited features compared to pricier models
Victron Energy BMV-712 Smart
The BMV-712 Smart is a premium battery monitor with a built-in display and Bluetooth. It measures voltage, current, and power, and has a high-resolution display that shows state of charge. It supports both lead-acid and lithium batteries and can be paired with Victron solar controllers to display solar input. The unit has a programmable alarm and can be connected to a phone for remote monitoring.
Pros
- Combines display and Bluetooth
- High accuracy and reliable
- Comprehensive data including historical trends
Cons
- Expensive
- Setup can be complex for beginners
Magnum Energy ME-BMK Battery Monitor Kit
This battery monitor kit is designed to integrate seamlessly with Magnum inverters and chargers. It includes a 500A shunt and a remote display that shows battery voltage, current, and state of charge. It doesn’t have built-in wireless, but you can connect it to Magnum’s network for remote access. It’s a good choice if you already have a Magnum inverter system.
Pros
- Seamless integration with Magnum products
- Accurate monitoring for Magnum systems
- Network capable for remote access
Cons
- Limited to Magnum ecosystems
- No built-in wireless
Simarine PICO Battery Monitor
The Simarine PICO is a high-end monitoring system that can monitor up to four battery banks and more. It features a color touchscreen and includes Bluetooth and Wi-Fi for wireless connectivity. It tracks voltage, current, temperature, and state of charge. It also has solar input channels, making it ideal for complex RV solar setups.
Pros
- Monitors multiple batteries simultaneously
- Touchscreen interface is user-friendly
- Robust app and data visualization
Cons
- Premium price
- May be overkill for simple setups
Before you buy
The lineup, side by side
| # | Model | Shunt capacity | Best for | Score | Price |
|---|---|---|---|---|---|
| 1 | Victron Energy SmartShunt 500A/50mV | 500A continuous | Best for precise state of charge and Bluetooth monitoring | 9.4 | Check price |
| 2 | Renogy 500A Battery Monitor with Shunt | 500A | Best for solar-ready monitoring with a shunt | 9.1 | Check price |
| 3 | BMON Battery Monitor with Bluetooth | 500A | Best for large battery banks and high current | 8.8 | Check price |
| 4 | AiLi Voltmeter Ammeter Battery Monitor | 100A or 350A options | Best budget pick for basic monitoring | 8.5 | Check price |
| 5 | Victron Energy BMV-712 Smart | 500A | Best for comprehensive solar and battery monitoring | 9.2 | Check price |
| 6 | Magnum Energy ME-BMK Battery Monitor Kit | 500A | Best for Magnum inverter systems | 8.2 | Check price |
| 7 | Simarine PICO Battery Monitor | Up to 500A per shunt (multiple shunts) | Best for multi-battery monitoring with touchscreen | 8.9 | Check price |
Common questions
Do wireless solar RV battery monitors work with lithium batteries?
Yes, most modern monitors support lithium batteries. However, you may need to adjust settings like Peukert exponent and charge efficiency to match lithium characteristics. Some monitors have presets for LiFePO4, making setup easier.
Can I monitor solar input with a battery monitor?
Yes, if the monitor is compatible with your solar charge controller. For instance, Victron monitors pair with Victron solar controllers, and Renogy monitors can connect to Renogy controllers via a Bluetooth module. Otherwise, you may only see total battery voltage and current, not solar-specific data.
How accurate are these monitors?
Shunt-based monitors are generally very accurate, with typical error less than 1% for current measurement. State of charge accuracy depends on proper setup, including battery capacity and charge efficiency. Regular calibration improves accuracy.
Do I need a display or can I just use my phone?
Many monitors offer both options. For example, the Victron BMV-712 has a display and Bluetooth, while the SmartShunt is app-only. If you prefer quick glanceable info, a display is handy. If you are comfortable using an app, you can save money and installation effort.
What is the difference between a battery monitor and a solar charge controller?
A solar charge controller regulates the voltage and current from solar panels to charge the battery safely. A battery monitor tracks the battery’s state of charge and power consumption. They serve different functions but can work together. Some monitors can display solar input if connected to the controller.
Can I install a battery monitor myself?
Yes, if you have basic electrical skills. The main task is connecting the shunt in line with the battery’s negative cable. Always disconnect power first and follow the manufacturer’s instructions. If you are unsure, consult a professional.
How do I choose the right shunt size?
Choose a shunt rated for the maximum current your system can draw or charge at. A 500A shunt is common for most RVs. If you have a large inverter or high-capacity battery bank, ensure the shunt can handle the peak current without overheating.
Do these monitors work with 24V or 48V systems?
Yes, many monitors support a wide voltage range. For instance, the Victron SmartShunt works from 6.5V to 70V, covering 24V and 48V systems. Check the specifications to confirm compatibility with your system voltage.
What is the Bluetooth range for these monitors?
Bluetooth range is typically around 10 to 30 meters (about 30 to 100 feet) in open air. In an RV, expect a shorter range due to walls and metal. Some monitors have extended range with external antennas, but most work fine within the vehicle.
Can I monitor multiple battery banks?
Some monitors, like the Simarine PICO, can monitor multiple banks with additional shunts. Most basic monitors are single-bank. If you have a house battery and a starter battery, you might need a multi-bank monitor or multiple units.
Our take
For most RV owners, the Victron Energy SmartShunt offers the best combination of accuracy, wireless convenience, and solar integration when paired with a Victron solar controller. If you’re on a budget, the Renogy 500A monitor with an optional Bluetooth module is a solid choice. For those with complex multi-battery setups, the Simarine PICO is worth the investment. Choose based on your system’s complexity and your desire for detailed data.
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