DC Multifunction Battery Monitor 0-200V 100A LCD
$26
Key Specs
| max-current | 100A |
| voltage-range | 0-200V |
| connection | Wired LCD |
| weight | 0.5 lbs |
| cable-length | 10 ft |
| warranty | 1 year |
Pros
- ✓ Compact and affordable for smaller battery systems
- ✓ Wide 0-200V voltage range despite the modest price
- ✓ Simultaneous voltage, current, power, and SOC display
- ✓ Simple plug-and-play wiring harness included
Cons
- ✗ 100A limit insufficient for high-draw inverter setups
- ✗ No wireless connectivity or data history
Detailed Review
Overview
The DC Multifunction 100A Battery Monitor is the compact sibling to the 300A version, sized for lighter-duty applications where peak draw stays below 100 amps. Small camper van builds, marine trolling motor setups, workshop backup power banks, and basic off-grid cabin installations all fall comfortably within its rating. Despite the modest current spec, it matches the 300A model’s voltage range — 0 to 200V — which makes it useful across a surprisingly wide variety of battery configurations.
How It Works
The 100A shunt installs in the battery’s negative conductor. It is a smaller, lighter bar than the 300A version, but operates on the same principle: the precision resistance generates a millivolt-proportional signal whenever current flows through it. The display unit reads this signal along with the battery voltage sense lead and computes instantaneous watts, cumulative watt-hours, amp-hours consumed, remaining SOC, and time to empty based on current draw.
Key Features
The LCD displays all key parameters on a single screen with backlighting for low-light readability. Voltage resolution is 0.1V, current resolution is 0.1A, and the SOC calculation references the user-entered battery capacity in amp-hours. An audible alarm triggers when voltage drops below a threshold you set during initial configuration — a useful low-battery early warning for unattended installations.
The display panel uses a standard rectangular cutout mount that fits most instrument panels and electrical enclosures. The included 10-foot wiring harness is adequate for typical installations. Setup involves entering your battery’s rated amp-hour capacity and optionally adjusting the Peukert exponent for lead-acid or lithium chemistries.
Who It’s For
This monitor is an excellent fit for small to mid-size builds where the total load rarely exceeds 1,200W on a 12V system. A 200W solar setup feeding a 100Ah battery running lights, a fan, and a 12V compressor cooler is a perfect application. If your system includes a 1,000W or larger inverter, the 300A version of this same monitor is the better choice. Both are simple, affordable, and reliable options for builders who prefer a dedicated display over app-based monitoring.
