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A Smarter Way to Monitor Generators and HVAC Systems at Remote Sites

By Andrew Erickson

September 5, 2025

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What if your current monitoring setup is hindered by legacy equipment, patchy internet service, and devices that are just hard to configure?

Your facilities are packed with critical gear. This includes telecom infrastructure, public safety radios, FM/TV broadcasters, and equipment racks leased out to multiple tenants. You have to protect them.

That's exactly the challenge one recent DPS client was facing. Like many others, they wanted better visibility into power and cooling systems, but were stuck using monitoring gear that hadn't kept up with the times.

See how a modern RTU-based monitoring system is solving their power and HVAC headaches - without overcomplicating the process.

Monitor your generator

Remote Sites with Failing Connectivity Offer No Real Visibility

This client was managing 10 sites, each with a mix of:

  • Utility power
  • One or two backup generators
  • Up to three HVAC units per site
  • Equipment racks leased to cell carriers, law enforcement, and broadcasters

The primary internet connection was a radio ISP, which cut out with zero warning.

To make things worse, the older monitoring equipment:

  • Required a Boolean-based configuration process, which was frustrating and easy to misconfigure
  • Didn't support dynamic IPs or cellular flexibility
  • Was limited in the number of analog inputs it could handle
  • Offered no practical web interface for either the client or their tenants

As a result, they had little to no real-time visibility during power outages, HVAC failures, or generator faults. And that's exactly when monitoring is needed most.

Legacy Systems No Longer Work for Modern Monitoring Needs

It's tempting to hang onto older systems because "they still work." But as the client admitted, they had simply put off replacing their legacy systems for years due to other projects.

That decision was costing them in 2024, and it might be costing you too:

1. ISP Radios Were Unreliable

Radio-based internet service was the primary link to many of the client's remote sites. Unfortunately, it was cutting out frequently, leaving them blind.

Switching to cellular seemed like the obvious next move, but they hit a roadblock: fixed/static IP addresses.

Many cellular carriers don't know how to handle requests for fixed IPs or they make the process overly complicated. That made the transition feel daunting.

2. Configuration Was a Nightmare

The old system's setup process was described as "Boolean" and "frustrating." Making even basic changes required working through nested logic and unfamiliar syntax.

With today's staffing shortages, training someone on an overly complex system just doesn't scale.

3. Limited Sensor Compatibility

The client wanted to monitor multiple voltages (AC/DC), temperature values (battery, engine, HVAC), and airflow states. Their older gear, though, didn't have the analog capacity or sensor flexibility to make that practical.

Some of their HVAC airflow sensors were simple switch closures, while others used resistive temperature probes. The old equipment wasn't flexible enough to support both easily.

4. No Shared Web Access for Tenants

Tenants like broadcasters and public safety users often wanted visibility into their equipment environments. But the existing setup didn't offer user-specific web access or read-only logins.

This lack of transparency created visibility holes and extra work for the client.

Implement Easy-to-Use, Cellular-Enabled Monitoring for All Key Infrastructure

This client had a crystal-clear vision for their next monitoring system:

  • Use cellular connectivity instead of unreliable ISP radios
  • Support dynamic IPs, to avoid the mess of fixed/static IP provisioning
  • Be able to monitor generators, HVACs, and power using both discrete and analog inputs
  • Offer a modern web interface for both client and tenant access
  • Be easy to configure - no Boolean logic or scripting
  • Allow for future growth without replacing the entire system

Ultimately, they needed a single platform that could do all of this, without requiring weeks of IT configuration or extensive training.

Use Remote Telemetry Units (RTUs) with Cellular Flexibility

Working with a DPS Engineer, the client explored a monitoring solution built on NetGuardian G6 RTUs, combined with a cellular gateway and D-Wire sensor bus.

This solution directly tackled their pain points with:

Reliable Connectivity Over Cellular

Using a DPS-supported RTU and a client-supplied cellular gateway, each site gains a dedicated IP connection. That means no more ISP radios to babysit.

Since the DPS web interface supports dynamic DNS, there's no need for static IPs, making cellular provisioning vastly easier.

Modern Web-Based Configuration

The G6 platform offers a clean, browser-based interface for:

  • Naming and configuring discrete inputs (e.g., "AC Unit 2 Airflow")
  • Scaling analog sensors (e.g., 0-5 VDC to 0-150 VAC)
  • Setting alert thresholds with minor/major levels
  • Assigning user roles (e.g., admin, read-only tenant)

No more cryptic setup steps. You just log in, configure your thresholds, and you're done.

Support for All the Required Sensors

The system integrates:

  • Analog monitoring for AC/DC voltages, battery temperatures, engine temperatures
  • Contact closures for airflow switches, generator states, and alarms
  • Resistive temperature probes (via inline current measurement)
  • Daisy-chained D-Wire sensors for temperature, humidity, airflow, and more - without input overload

This means the client can fully monitor:

  • Power loss events
  • Generator start-up and performance
  • HVAC performance, including airflow issues
  • On-site environmental conditions

Even better, the D-Wire bus supports up to 16 sensors per chain and has zero impact on traditional analog/discrete capacity.

HVAC Controller G3 monitoring and controlling HVAC units
The HVAC Controller monitors and controls your HVAC units. When combined with environmental sensors, it improves your environmental visibility of your remote sites.

Tenant Access & Notification Flexibility

The web interface supports user profiles with granular permissions:

  • Clients get full admin access
  • Tenants can log in with read-only accounts
  • Alarm routing is customizable, so you can send certain alerts to select users only

You can even send email or SMS alerts (via modern low-cost gateways), keeping everyone informed without relying on old pager-style alerting.

Scalability for 10 Sites - And Beyond

With 10 sites, the client was right at the threshold where they could:

  • Monitor sites independently via each RTU's web interface
  • Or centralize all alarms via a T/Mon alarm master

Either option is fully supported (and future expansion is simple).

DPS Advantage: Why This System Just Works

This project was successful because DPS does more than just sell boxes...

We specialize exclusively in remote monitoring systems. That means our gear is:

  • Battle-tested over decades of deployments
  • Designed for rugged environments (wide temp swings, EMI, surge)
  • Built with input flexibility (analog, discrete, Modbus, SNMP, etc.)
  • Paired with real engineering support, not just sales

From cellular integration to analog scaling to user access, every part of this system is designed to make your job easier.

The Hidden ROI: Better Monitoring = Fewer Emergencies

Beyond convenience, there's clear operational value in upgrading your monitoring system:

  • Catch HVAC failures early before they overheat gear
  • Detect generator startup issues during power outages
  • Log generator run hours for California emissions reporting (or for other regions with similarly requirements)
  • Empower tenants to self-check site health without calling you
  • Streamline alerts so only the right people get notified

The net result is fewer surprise failures, faster responses, and happier stakeholders.

Ready to Modernize Your Site Monitoring?

If you're stuck with legacy systems, unreliable radios, or confusing setups, it's time to step up.

Let DPS design a system for you that:

  • Uses cellular for primary connectivity
  • Supports dynamic IPs for easier provisioning
  • Monitors all your generators, HVACs, and power
  • Lets you configure everything via web interface
  • Sends alerts to you and your tenants
  • Grows with your future site count and input needs

We'll build your custom proposal - including diagrams, assumptions, and options - so you can get clarity before you commit.

Get Your Custom Monitoring Plan Today

Call DPS Telecom at (559) 454-1600
Or email sales@dpstele.com

Let us walk you through a real-world solution - just like we did for this client.

You'll get a full proposal with:

  • Recommended RTUs and gateways
  • Rack-mount or wall-mount options
  • Diagrams of sensor wiring and inputs
  • Explanation of dynamic IP support
  • Alert routing setup
  • Growth planning for your next 10 sites

Don't wait until another heatwave or power outage exposes the cracks in your system. Let's build a monitoring setup that works 24/7 - so you don't have to!

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Andrew Erickson

Andrew Erickson

Andrew Erickson is an Application Engineer at DPS Telecom, a manufacturer of semi-custom remote alarm monitoring systems based in Fresno, California. Andrew brings more than 18 years of experience building site monitoring solutions, developing intuitive user interfaces and documentation, and opt...