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Reserve Your Seat TodayYour battery plant is only useful if it's actually charged and operating within spec. When a rectifier fails silently, your batteries drain unnoticed until the site goes dark. A battery voltage monitoring system gives you continuous visibility into battery plant voltage, rectifier output, and discharge state, so you know about problems before they become outages.
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A battery voltage monitoring system uses analog input circuits on an RTU (Remote Terminal Unit) to continuously sample the DC voltage at your battery plant, rectifier output, and any other power points you want to track. When voltage drifts outside your configured thresholds, the RTU sends an alarm: email, SMS, SNMP trap, or a notification to a central alarm master station.
What you're watching for:
Slow power failures are the hardest kind to catch. A rectifier can fail quietly. Your batteries carry the load. Days pass. The generator runs. Nobody knows. The site goes dark.
This scenario isn't hypothetical. It's a pattern we see from clients who didn't have remote battery monitoring in place. One public safety radio operator described a rectifier failure that went undetected for five continuous days until the generator exhausted its fuel. The battery plant was fully charged and kept the site online, but no one knew anything was wrong until it was almost too late.
Monitoring battery voltage from your rectifier, battery string, and generator output closes that gap entirely. You see the moment commercial power drops. You see the battery voltage holding. You see when it starts dropping. Every step is visible.
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A complete battery plant monitoring setup typically covers:
| Point | What It Tells You |
|---|---|
| Rectifier output voltage | Whether commercial power is present and the rectifier is functioning |
| Battery string voltage | Charge state and whether the batteries are discharging |
| Generator voltage | Whether the generator started and is producing output |
| AC input voltage | Commercial power presence at the site |
Some NetGuardian RTUs have internally wired analog inputs, so you can automatically monitor the power feeding into the unit itself, without any additional wiring. For larger battery plants with multiple strings, analog inputs can be allocated per string to track them independently.
RTUs collect analog voltage readings from your battery plant and report them to a central system or send direct notifications when thresholds are crossed. The analog inputs typically accept 0-5VDC or 4-20mA signals and can be configured with independent alarm thresholds for each point.
At DPS Telecom, our NetGuardian RTU family handles battery voltage monitoring alongside other site conditions, including temperature, door access, equipment alarms, and generator status. You're not adding a separate device just for battery voltage; it's built into the same unit managing the rest of your remote site.
NetGuardian RTUs support connectivity over Ethernet, cellular, fiber, T1, serial, and dialup, so they work at sites that have full network infrastructure and at sites that have almost none.
Alarm thresholds are configurable per analog point. You can set a major alarm at a voltage level that requires immediate response and a minor alarm at a level that warrants attention but isn't yet critical.
When a threshold is crossed, the RTU can:
The notification path depends on how your monitoring system is set up. DPS Telecom supports all of these options and can help configure the right combination for your environment.
Talk to an Engineer | 800-693-0351
If you're responsible for more than a handful of remote sites, managing battery alarms individually per-site becomes impractical. A central alarm master station like T/Mon LNX aggregates alarms from all your sites into one interface, so your NOC team sees everything in one place, can acknowledge alarms, and can track alarm history across the network.
DPS Telecom has helped clients manage battery plant monitoring across networks ranging from a few rural telecom sites to networks with hundreds of locations. Central Utah Telephone used DPS equipment to catch power and battery alarm conditions that could have caused major service disruptions.
For more on multi-site management, see our battery monitoring best practices guide.
What voltage levels does battery voltage monitoring track?
RTU analog inputs can be configured for whatever voltage range your battery plant operates on, whether that's -48 VDC, +24 VDC, or another standard. Thresholds are set per application.
Can I monitor multiple battery strings independently?
Yes. Each analog input on an RTU monitors a separate voltage point. NetGuardian RTUs offer varying numbers of analog inputs depending on the model, so you can allocate inputs to individual strings as needed.
Does battery voltage monitoring require a network connection at the remote site?
No. NetGuardian RTUs support cellular, T1, serial, and dialup connections in addition to Ethernet, so monitoring is possible even at sites without LAN infrastructure.
What happens when a battery voltage alarm fires?
The RTU sends notifications via email, SMS, or SNMP trap, and forwards the alarm to your central alarm master station if one is in use. The specific notification path depends on how your system is configured.
Can battery voltage monitoring be combined with other site monitoring on the same RTU?
Yes. NetGuardian RTUs handle battery voltage, temperature, door access, equipment contact closures, and other inputs simultaneously from a single unit.
DPS Telecom has been building remote monitoring equipment since 1986. We've deployed more than 172,800 devices across 1,500+ organizations in telecom, utilities, transportation, and critical infrastructure. Every NetGuardian RTU ships configured for your specific application, so you're not starting from scratch with a generic device.
If you're evaluating a battery voltage monitoring system, or if you're trying to extend an existing setup to cover more sites, our engineers can walk through the options with you. You can also request a 30-day loaner unit to trial the hardware at your site before committing.
