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Keeping an eye on your solar battery bank’s voltage, current, and state of charge helps you avoid over-discharge and catch problems early. A dedicated battery monitor gives you real-time data that a simple voltmeter cannot. For a deeper look at battery basics, see our guide to home solar batteries.
The Renogy and RICH SOLAR monitors measure current through a shunt; the ECO-WORTHY ESM100 is a touchscreen display that connects to ECO-WORTHY batteries over RS232. They also differ in voltage range, display type, and alarm features. We’ve compared their specs side by side so you can pick the right one for your setup.
Every specification on this page comes from the manufacturer’s own product page, checked on 31 October 2026. We have not used these products ourselves, so the picks are based on published specifications only.
If you’re troubleshooting battery issues, see our battery problems guide and solar monitoring overview.
How we chose these
- Accuracy and Measurement Range: Look for shunt-based monitors with ±1% accuracy and a wide voltage range to match your battery bank.
- Battery Compatibility: Ensure the monitor supports your battery chemistry (lead-acid, lithium, etc.) and voltage.
- Installation and Wiring: A clear wiring diagram and included shunt holder simplify setup.
- Alarm and Protection Features: High/low voltage alarms help prevent battery damage.
Renogy and RICH SOLAR use a shunt; ECO-WORTHY lists no shunt for the ESM100.
Comparison table
| Product | Voltage Range | Current Range | Accuracy | Display | Alarm | Standby Power |
|---|---|---|---|---|---|---|
| ECO-WORTHY ESM100 | Not stated | Not stated | Not stated | 4.3-inch touchscreen, 480×272 | Not stated | <0.1W |
| Renogy 500A | 10V – 120V | Up to 500A | ±1% (maker claim) | Backlight LCD (size not stated) | High/low capacity alarm | 1 mA |
| RICH SOLAR RS-BM500 | 8V – 120V | Up to 500A | ±1.0% (voltage, current, capacity) | Remote display (size not stated) | Not stated | 1 mA |
Standby power values are as reported by each maker; Renogy and RICH SOLAR list standby dissipation in milliamps, while ECO-WORTHY states less than 0.1W.
1. ECO-WORTHY ESM100 Battery Monitor: for Cubix Series and wall-mount batteries
The ECO-WORTHY ESM100 is a touchscreen battery monitor designed for the company’s Cubix Series and wall-mount batteries. It uses an RS232 communication interface and wakes on touch. The 4.3-inch display has a resolution of 480 by 272 pixels. ECO-WORTHY states standby dissipation is less than 0.1W.
- Operating power: <1W (ECO-WORTHY)
- Operating temperature: -20°C to 75°C (ECO-WORTHY)
- Weight: 150g / 0.33 lbs (ECO-WORTHY)
Pros: Touchscreen display; low standby power; compact size
Cons: Only compatible with specific ECO-WORTHY batteries; no stated voltage or current range; no alarm function mentioned
Check the ECO-WORTHY ESM100 Battery Monitor on Amazon
2. Renogy 500A Battery Monitor With Shunt: for most battery types up to 500A
Renogy’s 500A Battery Monitor uses a shunt for real-time voltage and current measurement. It claims 1% accuracy and is compatible with lead-acid, lithium iron phosphate, lithium-ion, and nickel-metal hybrid batteries. The monitor can set high and low capacity alarms, flashing the backlight and voltage value when triggered. It includes a 20-foot shielded cable and a transparent shunt holder.
- Data storage: saves last testing data when power off (Renogy)
- Backlight auto shut-off when charging current <100mA (Renogy)
- Shunt: 500A (Renogy)
Pros: Wide voltage range; compatible with multiple battery chemistries; alarm function; long cable included
Cons: Display size not specified; standby dissipation given in mA, not watts
Check the Renogy 500A Battery Monitor With Shunt on Amazon
3. RICH SOLAR 500 Amp Battery Monitor with Shunt (RS-BM500): for 8-120V battery banks
The RICH SOLAR RS-BM500 is a shunt-based battery monitor for systems from 8 to 120 volts. The maker states accuracy of ±1.0% for voltage, current, and capacity readings. Installation requires mounting the shunt close to the battery and routing a shielded cable to the remote display. The package includes the shunt, display, shielded cable, and B+ wire.
- Capacity setting range: 0-500A (RICH SOLAR)
- Working dissipation: 10mA (RICH SOLAR)
- Weight: 2 lb gross (RICH SOLAR)
Pros: Widest voltage range (8-120V); high accuracy
Cons: No alarm function mentioned; display size not given
Check the RICH SOLAR 500 Amp Battery Monitor with Shunt (RS-BM500) on Amazon
Which one fits you
| Your situation | Look at | Why |
|---|---|---|
| You have an ECO-WORTHY Cubix or wall-mount battery | ECO-WORTHY ESM100 | Designed specifically for those batteries with touchscreen and RS232. |
| You need a monitor for a mixed battery bank up to 500A | Renogy 500A | Broad chemistry compatibility and alarm protection. |
| You want the widest voltage range and high accuracy | RICH SOLAR RS-BM500 | 8-120V range and ±1% accuracy on all readings. |
| You prioritize low standby power draw | ECO-WORTHY ESM100 | Standby dissipation under 0.1W. |
Practical tips
- For a battery bank without a built-in monitor port, a shunt-based monitor such as the Renogy or RICH SOLAR reads current at the battery.
- Match the monitor’s voltage range to your battery bank’s nominal voltage.
- Look for a monitor with programmable alarms to prevent over-discharge.
- Consider the length of the shielded cable if the display will be far from the battery.
FAQ
Do these monitors work with lithium batteries?
Renogy states compatibility with lithium iron phosphate and lithium-ion. ECO-WORTHY’s ESM100 is made for its own Cubix and wall-mount batteries. RICH SOLAR does not specify battery chemistry.
Can I set alarms on these monitors?
Renogy has high and low capacity alarms that flash the backlight and voltage value. ECO-WORTHY and RICH SOLAR do not mention alarm functions in their product listings.
How accurate are these battery monitors?
Renogy claims 1% accuracy. RICH SOLAR states ±1.0% for voltage, current, and capacity. ECO-WORTHY does not list an accuracy specification.
Sources
Specifications from each manufacturer’s product page, checked 31 October 2026: ECO-WORTHY ESM100 Battery Monitor, Renogy 500A Battery Monitor With Shunt, RICH SOLAR 500 Amp Battery Monitor with Shunt (RS-BM500). Makers can change specifications; check the product page before you buy.
