Renogy RBM500
(27 reviews)
The Renogy RBM500 continuously tracks voltage, current and state of charge through a 500A shunt and a wired LCD display, accurate to within 1%.
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Characteristics
- Shunt: 500A, 10-120V range
- Accuracy: ±1% (current, voltage, capacity)
- Display: Backlit wired LCD (20 ft cable)
- Compatibility: Lead-acid (AGM, Gel), lithium LiFePO4, NiMH
- 1% accuracy and 20 ft cable, no built-in Bluetooth (BT-2 optional)
Detailed overview: Renogy 500A Shunt Battery Monitor
The Renogy RBM500 is a shunt-based battery monitor, designed to track the real-time status of a leisure battery in a van, RV, boat or fixed solar setup. Unlike a simple voltmeter, which only gives a rough indication, a shunt monitor directly measures current flowing in and out of the battery, for an accurate calculation of true state of charge.
The shunt, rated for 500A, wires in series on the battery's negative terminal and covers a wide 10V to 120V voltage range, suiting 12V, 24V or 48V systems alike. Claimed accuracy is 1% on current, voltage and measured capacity, with a configurable capacity preset from 0.1 to 9999Ah to match any battery bank size.
The LCD display, with adjustable green backlighting, shows voltage, current, power consumption, estimated remaining runtime and charge percentage simultaneously, on a compact 3.9 x 2.4 x 0.7 in (99 x 61 x 18mm), 2.6 oz (75g) unit. It connects to the shunt via a supplied 20 ft (6m) shielded cable, letting you position it well away from the battery, for example on a dashboard or near a van's door. A programmable high/low voltage alarm flashes the backlight when set thresholds are exceeded.
Important to know before buying: the RBM500 has no built-in Bluetooth at all. It works purely through its physical wired display. For smartphone monitoring via the Renogy DC Home app, you need to add the Bluetooth BT-2 module, sold separately and compatible with several Renogy products. Compatible with lead-acid batteries (AGM, Gel), lithium LiFePO4 and NiMH, the RBM500 remains a simple, accurate and affordable solution for anyone who doesn't need permanent remote monitoring.
Comparison
How does the Renogy RBM500 compare with other shunt-based battery monitors?
| Criterion | Renogy RBM500 | Victron SmartShunt 500A | Victron BMV-712 | AiLi 500A |
|---|---|---|---|---|
| Shunt | 500A, 10-120V | 500A, 6.5-70V | 500A, 6.5-95V | 500A, 10-120V |
| Built-in Bluetooth | No (BT-2 module optional) | Yes, built-in | No (SmartConnect module optional) | No |
| Display | Wired LCD (20 ft cable) | None (app only) | Wired colour LCD | Wired LCD |
| Accuracy | ±1% | 99.6% | ±1% | ±1% |
| Observed price | $87 | ≈ $98 | ≈ $190 | ≈ $80 |
The Renogy RBM500 stands out as the most affordable option with a physical display included, where the Victron SmartShunt bets everything on Bluetooth and the app, with no screen at all. Victron's BMV-712 offers a more readable colour display but at a much higher price. Against the AiLi 500A, the RBM500 benefits from Renogy's reliability and support network. For anyone who prefers an instant physical readout without relying on a phone, the RBM500 remains the most complete choice at this price.
Related video
Video: Renogy 500A Battery Monitor - Published on 09/09/2019
Our tester's review: Gilles Caron
We fitted the RBM500 to a setup with a 200Ah lithium leisure battery, keen to finally know what's really going on inside it, beyond a basic voltmeter reading. The shunt wires in once, on the negative terminal, and the LCD display, connected via a 20 ft shielded cable, can be mounted well away from the battery, on a dashboard for instance. The result: live readout of voltage, current and, most usefully, remaining charge percentage, far more meaningful than raw voltage alone. Over time, the claimed 1% accuracy held up well against a reference multimeter. The one thing to know before buying: this monitor has no Bluetooth at all, despite what the price might suggest. For smartphone monitoring, you need to add Renogy's BT-2 module, sold separately. For anyone happy with the physical screen, often plenty for RV use, the RBM500 does the job well at a fair price.
Frequently asked questions: Renogy 500A Shunt Battery Monitor
Not natively, no. It works with a wired LCD display connected to the shunt via a 20 ft cable. For smartphone monitoring, you need to add the separately-sold Bluetooth BT-2 module.
Claimed accuracy is ±1% on current, voltage and capacity measurement, thanks to its dedicated 500A shunt, far more reliable than a simple voltage reading.
It's compatible with lead-acid batteries (AGM, Gel), lithium LiFePO4 and nickel-metal hydride (NiMH), across a 10V to 120V range suiting 12V, 24V and 48V systems.
The shunt wires in series on the battery's negative terminal, with the supplied transparent holder for easy mounting. The LCD display, connected via a 20 ft shielded cable, can then be positioned at a distance.
Yes, you can monitor multiple batteries by installing one RBM500 monitor per battery, each with its own shunt and dedicated wiring.
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