Acrel Energy Monitoring from Main Switchboard to Every Major Load

Most facilities can name their total power bill, but far fewer can explain where the energy went after it crossed the main switchboard.

That gap matters. A site can have a well-maintained electrical system and still miss rising demand charges, poor power factor, overloaded boards, after-hours plant operation, compressor waste, refrigeration faults, and small circuits that quietly add up. The main meter shows the whole picture, but it cannot show the cause.

A complete Acrel monitoring project changes that. It starts at the incomer, then follows energy through the site: main switchboard, submains, distribution boards, HVAC, refrigeration, pumps, compressors, production lines and individual circuits. Each level adds context. Each meter turns a blind spot into a measured part of the facility.

ProSense supplies Acrel meters, gateways and system components for complete electrical monitoring projects across Australia. More than a parts supplier, ProSense helps match the right metering approach to the site, the board layout, the loads and the reporting outcome.

The best monitoring projects start where power enters the facility.

Start with the facility incomer

The incomer is the first place to measure because it gives the electrical baseline for the whole site. It answers the big questions before the project moves downstream.

A meter at the main switchboard can track:

• Total kWh use

• Demand over time

• Voltage and current per phase

• Power factor

• Frequency

• Import and export energy where relevant

• Load balance across phases

• Alarms for abnormal conditions

  
  

This level is useful for owners, facility managers, maintenance teams and energy consultants because it creates a single reference point. If the electricity bill rises, the main meter confirms when the increase happened. If demand peaks cause higher charges, the meter shows the timing and shape of the peak. If a phase is carrying more than the others, the incomer data makes the issue visible.

The main switchboard view also helps check the quality of the supply entering the site. Voltage issues, power factor problems and unbalanced loading can affect equipment life and nuisance tripping. Without measurement, those issues often get blamed on the wrong asset.

Acrel meters are well suited to this first layer because they cover the common requirements for electrical monitoring projects: multi-function power measurement, clear local display options, communication capability and integration with broader monitoring systems.

At this stage, the aim is not to measure every circuit. The aim is to establish the site’s electrical truth.

Move from the main switchboard to distribution boards

Once the incomer is measured, the next step is to split the total load into meaningful areas. Distribution board metering shows where the site’s energy goes after the main switchboard.

A typical facility may separate electrical loads by:

Area	What metering can reveal
Administration and amenities	Base load, lighting schedules, after-hours use
Warehouse or logistics areas	Lighting, dock equipment, battery charging
Plant rooms	Mechanical services, pumps, controls
Production areas	Line demand, shift patterns, standby load
Cold rooms or refrigerated areas	Compressor cycling, defrost operation, door-related load
External services	Yard lighting, irrigation, security systems

This level is where energy monitoring starts to become practical. A whole-site demand peak may be interesting, but a distribution board meter can show whether that peak came from mechanical services, production, refrigeration or another area.

For many projects, ProSense will help choose between full multi-function meters, branch monitoring devices or compact meters depending on the switchboard space, circuit count and reporting needs. Older switchboards may have limited space. Some sites need metering added with minimal disruption. Others are designing new boards and can include monitoring from the start.

The key is to avoid random metering. Each meter should answer a clear question.

Good questions include:

• Which part of the site drives maximum demand?

• Which board carries the largest after-hours load?

• Are lighting and general power behaving as expected?

• Is a submain nearing its practical capacity?

• Which area should be investigated before new equipment is added?

  
  

When the main switchboard and distribution boards are both monitored, the energy map starts to take shape.

Track HVAC because it often controls the demand peak

HVAC is one of the most important loads to monitor in commercial and industrial buildings. Air conditioning, ventilation fans, chillers, cooling towers and packaged units can create large, recurring demand peaks. In many sites, HVAC also runs longer than expected due to schedules, manual overrides or control faults.

Monitoring HVAC at the electrical level can show:

• Start-up demand

• Daily run hours

• Weekend or after-hours operation

• Seasonal load changes

• Cycling patterns

• Differences between similar units

• Power factor behaviour

  
  

This matters because HVAC faults are not always obvious from comfort complaints. A system may keep the space cool while still wasting energy through short cycling, simultaneous heating and cooling, failed dampers, dirty filters or poor scheduling.

Acrel monitoring does not replace the building management system. It adds an independent electrical view. That view is valuable because it measures what the HVAC equipment actually draws, not just what the control system believes it commanded.

For example, a site may have two similar rooftop units serving similar areas. If one draws noticeably more energy under similar conditions, the data can point maintenance to the right unit. That does not diagnose the mechanical fault by itself, but it narrows the search.

ProSense can support HVAC monitoring with meters at the mechanical services board, sub-circuit metering for major units, and communications equipment to bring the data into a central platform.

HVAC monitoring links electrical data with real plant behaviour.

Measure refrigeration before small faults become expensive

Refrigeration loads deserve close attention because they run for long periods and protect valuable stock. Supermarkets, food processors, cold storage sites, hospitality venues, laboratories and manufacturing plants all rely on refrigeration staying within expected operating patterns.

Electrical monitoring can help identify changes such as:

• Longer compressor run times

• Higher energy use during defrost cycles

• Increased load after door or seal issues

• Excessive cycling

• Unusual overnight consumption

• Different behaviour between similar rooms or systems

  
  

Refrigeration faults often build slowly. A blocked condenser, low refrigerant condition, damaged door seal, failed fan or control issue may not immediately cause a temperature alarm. Yet the electrical load can start changing early.

A meter on the refrigeration board gives a broad picture. Meters on individual compressors, condensers or evaporator groups provide more detail. The right level depends on the value of the refrigerated product, the number of systems and how quickly the site needs to detect drift.

For cold storage and food facilities, energy monitoring also supports operational decisions. If a defrost schedule causes a regular demand spike, the site may be able to stage loads more carefully. If two cold rooms behave differently despite serving similar duty, maintenance can investigate before energy waste becomes normal.

Give pumps and compressors their own data

Pumps and air compressors are common sources of hidden energy loss. They often run in plant rooms, away from daily attention, and their load can vary sharply based on leaks, valves, pressure settings and control methods.

Pump monitoring helps confirm real duty

Pumps may serve chilled water, condenser water, process water, wastewater, fire systems, irrigation or hydraulic processes. Electrical data can reveal whether the pump is running when it should, stopping when it should, and drawing the expected load.

Useful pump checks include:

• Run hours against the control schedule

• Current draw compared with normal duty

• Starts and stops over time

• Load changes after valve adjustments

• Standby pump operation

• Unusual operation outside process hours

  
  

A pump that runs continuously against a closed or restricted valve may not trigger an immediate alarm, but the energy profile will show waste. A standby pump that starts frequently may point to a control or duty pump problem. A pump drawing more current than usual may need mechanical attention.

Compressor monitoring exposes costly air leaks

Compressed air is expensive because it converts electrical energy into stored air pressure with losses at every stage. Leaks, poor pressure settings, inappropriate uses and failed drains can keep compressors running when production has stopped.

Electrical monitoring can show:

• Base load during non-production periods

• Compressor cycling patterns

• Demand during shift changeovers

• Differences between multiple compressors

• Weekend operation

• Load reduction after leak repairs

  
  

A main compressor meter gives a strong starting point. For larger systems, individual compressor metering is better because it shows which machine carries the load and whether sequencing is working as intended.

Compressors and pumps need their own visibility because small losses run for many hours.

Connect production equipment to output

Production equipment is where energy data becomes linked to business performance. Rather than only asking how much electricity the site used, the question becomes how much energy it used to produce a batch, a shift, a tonne, a pallet, a part or a finished product.

This is especially useful for:

• Food and beverage lines

• Packaging equipment

• CNC machines

• Extruders and moulding machines

• Ovens and furnaces

• Welders

• Conveyors

• Crushers, mixers and mills

• Textile and printing equipment

  
  

Acrel meters can be installed on major production loads or line-level boards to show energy use per process area. This can help compare shifts, confirm idle power use, see the impact of process changes and identify equipment that draws power while not producing.

For example, a production line may show a high energy base load before the first product comes off the line. That can point to long warm-up times, conveyors running early, extraction starting too soon or equipment left energised between shifts.

Energy monitoring is also useful when a site adds new machines. Before installation, existing data helps confirm spare electrical capacity and demand behaviour. After installation, monitoring confirms the real impact on the site load.

ProSense can help define the metering boundary. Sometimes the best point is the machine isolator. Sometimes it is the line distribution board. Sometimes it is a group of circuits that together represent a process. Clear boundaries make the reports meaningful.

Use circuit-level monitoring where detail matters

Not every circuit needs its own meter. Circuit-level monitoring works best when the load is important, variable, costly, hard to access or likely to cause disputes.

Common circuit-level targets include:

• Tenant supplies

• EV chargers

• Solar inverters and battery systems

• Critical mechanical loads

• Lighting control panels

• Server or communications rooms

• Kitchen equipment

• Battery charging areas

• High-use general power circuits

  
  

Circuit monitoring can also help when a board has many smaller loads that together form a major part of the site total. By measuring groups or selected final circuits, the facility can see which smaller loads deserve attention.

This level is useful for verification. If a project upgrades lighting, changes a control schedule or repairs compressed air leaks, circuit data confirms whether the saving appears where expected. It also prevents false confidence. A lower main bill may come from weather, production changes or operating hours. Circuit data shows the specific impact.

Build the system around communication, not just meters

Meters are only useful if people can access and trust the data. A complete project needs the right communication design.

A typical Acrel monitoring system may include:

• Power meters at main and submain locations

• Current transformers matched to each circuit

• Communication wiring or suitable network links

• Gateways for collecting meter data

• Local displays where operators need them

• Software or cloud-based monitoring where required

• Alarms for demand, current, voltage or power factor conditions

• Reports for energy use, load profile and comparison

  
  

The best architecture depends on the site. Some facilities need local monitoring only. Others want central reporting across multiple sites. Some need data sent into a building management system, SCADA system or energy platform.

ProSense’s role is to help make those choices early. Meter type, CT selection, communications protocol, board space, installation method and reporting expectations all affect the final result. If these are treated as separate decisions, the system can become harder to expand later.

A well-planned project also leaves room for future stages. A site may begin with the incomer and HVAC, then add refrigeration and compressors, then move to production lines and circuit-level metering. The system should grow without requiring a complete redesign.

Board-level planning makes the monitoring system easier to expand.

Turn readings into useful decisions

Energy monitoring should lead to action. Pretty graphs are not enough.

A useful system helps teams answer practical questions:

• What caused yesterday’s maximum demand?

• Which loads run outside operating hours?

• Is the site close to an electrical capacity limit?

• Which assets should maintenance inspect first?

• Did a repair or control change reduce consumption?

• Which process uses the most energy per unit of output?

• Are phase loads balanced across key boards?

• Is power factor drifting outside the expected range?

  
  

The value grows when data is reviewed regularly. A monthly bill review is too slow for many issues. Weekly checks can catch abnormal loading. Daily checks may suit refrigeration, compressed air or production-critical loads. Alarms can draw attention to urgent events, while trend reports help with planning.

Good monitoring also improves conversations between teams. Maintenance, operations, contractors and management can work from the same data instead of guesses. That can shorten fault-finding and make energy projects easier to justify.

Where ProSense fits in an Acrel monitoring project

A complete monitoring project has many parts. The meters are only one part of the outcome.

ProSense supports projects from product selection through to system planning. That can include helping identify what to meter, matching Acrel devices to the load and switchboard, planning staged rollouts, supplying meters and accessories, and supporting integration requirements.

A strong project usually follows this path:

1. Define the questions

   
   

   Decide what the system must show. Demand control, tenant billing, maintenance alerts, production energy, refrigeration behaviour and capacity planning all need different levels of detail.

   
   

1. Map the electrical hierarchy

   
   

   Start at the incomer, then identify main switchboards, distribution boards, mechanical boards, production boards and high-value final circuits.

   
   

2. Select the metering points

   
   

   Choose meter locations that explain the load without overcomplicating the system.

   
   

1. Match meters and current transformers

   
   

   Select devices that suit the circuit size, available space, accuracy needs and communication method.

   
   

2. Plan communications

   
   

   Decide how data will move from the switchboard to the people or systems that need it.

   
   

1. Install and verify

   
   

   Check CT orientation, phase matching, meter setup and data quality before relying on reports.

   
   

2. Review and expand

   
   

   Use early data to choose the next stage. The best monitoring systems grow with the facility.

   
   

This is where a solution partner matters. Buying separate meters without a plan can create islands of data. Working with ProSense gives the project a clearer structure from the main switchboard to the final circuit.

Complete monitoring connects site energy use to the loads that create it.

The best energy map starts at the top and keeps going

A single main meter can explain the total. A complete monitoring system explains the reasons behind it.

By measuring from the incomer down through distribution boards, HVAC, refrigeration, pumps, compressors, production equipment and selected circuits, a facility gains a clear electrical map. That map supports lower waste, better maintenance, stronger capacity planning and more confident decisions.

Acrel energy monitoring gives the hardware and data foundation. ProSense helps shape it into a complete project that fits the site, answers the right questions and can grow over time.

The practical next step is simple: start with the main switchboard, then follow the loads that matter most.