DROK Coulometer DC 8-100V 100A Battery Monitor - Color LCD

In this review the DROK Coulometer is evaluated as a midrange battery monitor for RVs, solar systems and vehicles that need precise SOC tracking. Its single biggest reason to buy is the large 2.4 in color LCD combined with true coulomb counting across a wide voltage range, which makes remaining capacity and instantaneous power easy to read at a glance. The unit feels well built and accurate in normal use, and it keeps useful data for both charging and discharging applications.

Key Features

• Wide voltage range: Supports 8 to 100V so it works on common 12V, 24V, 36V, 48V and 60V battery systems without extra converters.
• High current capability: Models cover up to 100A (and other versions to 500A) so it handles alternator and inverter loads found on boats and RVs.
• Accurate measurements: Voltage accuracy is 1%+2 digits and current precision is 0.5%+2 digits, which gives reliable ampere and state of charge numbers for everyday monitoring.
• Color LCD display: The 2.4 in high contrast screen is easy to read day or night, including under sunlight and with adjustable backlight levels.
• Backlight alarm: Configurable LBR function flashes the backlight when capacity falls below a threshold or when charging current exceeds the set STI value, providing clear visual warnings.
• Fast sampling: Measures up to 20 times per second so transient changes in current and power are tracked smoothly.

Who It's For

This monitor is aimed at DIYers and professionals who need a dedicated coulombmeter for automotive, RV and small solar installations; it is especially useful where users want both voltage/ampere readouts and a running capacity counter with percent SOC. The broad voltage and current options make it suitable for single battery banks and multivoltage setups.

Those who should look elsewhere include users who need integrated telemetry or WiFi/Bluetooth out of the box, or anyone who prefers a touchscreen interface-this unit focuses on wired measurement accuracy and a physical install with a separate measurement board.

Pros & Cons

Pros

• Large 2.4 in color screen provides clear readouts in most lighting conditions.
• Wide voltage range and multiple current model choices fit many vehicle and solar systems.
• Accurate voltage and current readings with a fast 20 Hz sample rate for stable monitoring.
• Backlight alarm and configurable settings help protect battery health and alert on faults.

Cons

• Instructions are minimal; some users find initial setup and configuration fiddly without clearer documentation.
• No wireless connectivity is provided, so remote monitoring requires separate solutions.

Specifications

Voltage range	8-100V
Current range	0.05-100A (other versions to 500A)
Capacity range	0.1-99999AH
Power range	0-50KW
Voltage accuracy	1% + 2 digits
Current precision	0.5% + 2 digits
Display	2.4 in LCD color, adjustable backlight

Our Verdict

The DROK Coulometer is a practical, cost effective battery monitor for RV, automotive and small solar setups that need accurate coulomb counting and a readable display. It offers broad voltage compatibility, clean measurements and useful alarms, making it a good value for users who can tolerate basic instructions and do not require wireless features.

Frequently Asked Questions

Does this monitor work with 12V and 48V systems?
Yes. The 8-100V range covers 12V, 24V, 36V, 48V and 60V battery banks without additional converters.

Will it remember data if power is interrupted?
Yes. Customers report it retains capacity data through power interruptions so the SOC is preserved after brief outages.

Is the backlight adjustable and can it alarm?
Yes. Backlight brightness is adjustable and the LBR alarm flashes the backlight when capacity or voltage falls below set thresholds or when charging current exceeds STI.