Commercial Solar Interval Data Checklist for Tasmania
Last reviewed: 6 September 2026
Commercial solar quotes can miss the mark when installers size systems according to roof area rather than actual electricity demand.
That’s where interval data becomes valuable.
Interval data records electricity use in half-hourly or similar periods. As a result, it shows when your business uses power, not just how much electricity appears on your bill.
Before investing in commercial solar, it’s important to understand your daily electricity patterns.
This checklist is designed for Tasmanian businesses connected to the TasNetworks electricity network. It explains what to look for before choosing a commercial solar system.
Rather than promising fixed savings or payback periods, we’ll focus on practical design considerations.
Why Monthly Electricity Bills Aren’t Enough
A quarterly electricity bill shows your total energy consumption. However, it doesn’t reveal exactly when your business uses that electricity.
Interval data provides this missing information.
Matching solar generation with demand
Solar panels generally produce the most electricity around the middle of the day.
However, your business may experience its highest demand at other times.
For example, a site might have a morning peak when employees arrive. Another peak could occur after 4 pm as solar generation declines.
In this situation, a large solar array could export excess electricity at midday while the business continues importing electricity later.
Therefore, understanding when electricity is consumed is essential for accurate system sizing.
Understanding Tasmanian electricity tariffs
Some TasNetworks business tariffs include peak periods during weekday mornings and late afternoons or evenings.
However, tariff arrangements vary between businesses.
For this reason, we always check your actual tariff and network assignment rather than assuming standard time-of-use periods.
Why operating patterns matter
Consider two different Tasmanian businesses.
A packing shed might use substantial electricity early in the morning and late in the afternoon. Meanwhile, a coolstore may operate refrigeration equipment throughout the day.
Both businesses could have similar quarterly electricity consumption.
Nevertheless, their ideal solar system designs could be very different.
Interval data helps distinguish between a system designed around available roof space and one designed around actual electricity demand.
Commercial Solar Interval Data Checklist
Before accepting a commercial solar quote, work through these eight checks.
1. Collect at Least 12 Months of Interval Data
A few weeks of electricity readings rarely provide a complete picture.
Instead, aim to collect at least 12 months of interval data.
This allows you to review seasonal demand, shutdown periods and changes in operating hours.
For example, a Tasmanian tourism business may use considerably more electricity during summer. In contrast, a school or office may experience lower consumption during holiday periods.
Therefore, a full year of data provides a more reliable basis for system design.
If only three months of data are available, make this clear during the assessment. Your installer should explain how the limited information affects the design.
What to do: Ask your electricity retailer or metering provider for the longest available interval data export.
2. Compare Weekday and Weekend Electricity Use
Electricity demand often changes throughout the week.
For example, a warehouse may operate at full capacity from Monday to Friday but use very little electricity on Sundays.
Meanwhile, a hospitality business could experience higher demand on weekends.
Start by comparing weekday and weekend consumption.
Then, identify any regular peaks or quiet periods.
This comparison helps determine whether proposed solar generation aligns with normal business operations.
What to do: Create separate weekday and weekend demand charts.
3. Identify Your Main Solar Generation Window
In Tasmania, a north-facing solar array generally produces strongly from late morning through mid-afternoon.
However, panel orientation, shading and seasonal conditions affect actual generation.
As a starting point, highlight approximately 10 am to 3 pm on your electricity demand chart.
Next, compare your business’s electricity use during those hours with demand outside that period.
Consider roof orientation and shading
East-west solar arrays may produce electricity across a broader part of the day.
Similarly, nearby buildings or sheds can affect generation through shading.
Therefore, your installer should assess the site’s actual generation potential rather than relying on a generic solar production pattern.
What to do: Identify how much electricity your business uses during likely solar generation hours.
4. Separate Base Load from Demand Spikes
Not all electricity demand behaves the same way.
A coolroom compressor may create a relatively steady load. However, industrial equipment or an EV fleet could produce short periods of high demand.
These differences matter when designing a solar system.
For example, a consistent daytime base load may suit solar generation particularly well.
In contrast, brief demand spikes might require changes to equipment scheduling.
Sometimes, adjusting operating times provides a better solution than installing additional panels.
What to do: Identify regular electricity demand separately from short, high-consumption events.
5. Review Maximum Demand Charges
Some commercial electricity tariffs include demand charges.
These charges can depend on the highest level of electricity demand recorded during a specified period.
Therefore, short electricity peaks may affect costs even when total energy consumption remains relatively stable.
Solar panels can help reduce demand during daylight hours.
However, they won’t directly address an evening demand spike when solar generation is unavailable.
In that situation, battery storage or load shifting may deserve consideration.
What to do: Check whether your tariff includes demand charges and identify when your highest peaks occur.
6. Confirm Solar Export Assumptions Early
Commercial solar installations may face network export restrictions.
Depending on system size and connection arrangements, TasNetworks may require additional assessments or export controls.
Some installations may also need to operate with limited or no export.
Therefore, a solar proposal should not assume unlimited electricity export.
Network connection comes before panel numbers
Before finalising system capacity, confirm the applicable connection requirements.
Additionally, ask how export restrictions affect the proposed system design and financial assumptions.
This remains important for mid-scale commercial solar projects.
Although certificate eligibility may influence project finances, it doesn’t increase available network export capacity.
What to do: Ask your installer to explain the export assumptions included in the proposal.
For further information, see our commercial solar services page.
7. Include Planned Electrical Upgrades
Your business’s electricity demand may change after installing solar.
For example, you might introduce:
Heat pump heating and cooling.
Electric hot water systems.
Electric forklifts.
EV fleet charging.
Additional refrigeration equipment.
New production machinery.
These upgrades can change both total electricity use and daily demand patterns.
Therefore, tell your installer about planned equipment changes over the next 12–24 months.
This information can help identify whether the electrical infrastructure should support future expansion.
What to do: Prepare a list of planned electrical upgrades before the solar assessment.
8. Define What a Successful Solar Installation Looks Like
Every commercial solar project should have clear objectives.
However, broad goals such as “maximise savings” don’t provide enough information for accurate system design.
Instead, define what you want the installation to achieve.
For example, your goals might include:
Covering more weekday daytime electricity demand.
Reducing imported electricity during operating hours.
Supporting planned electrification.
Preparing the site for future solar expansion.
Improving alignment between generation and consumption.
Clear objectives help your installer recommend a suitable system.
What to do: Agree on the project’s priorities before comparing quotes.
Commercial Solar Scenarios Across Tasmania
Different industries have different electricity demand patterns.
Therefore, commercial solar design should reflect how each business operates.
Regional warehouses
Warehouses may use substantial electricity during weekday operating hours.
However, demand can fall significantly on weekends.
Consequently, system sizing should focus on normal operating days rather than available roof space alone.
Food processing and coolstores
Refrigeration equipment can create consistent daytime electricity demand.
As a result, these businesses may have opportunities to use solar generation directly.
However, equipment schedules and seasonal conditions still require assessment.
Agricultural packing sheds
Agricultural operations often experience seasonal electricity peaks.
For example, a packing shed may use substantial energy during harvest periods but much less during quieter months.
Therefore, annual interval data is particularly useful.
Hospitality businesses
Restaurants and hospitality venues may experience demand peaks around lunch and dinner.
However, evening electricity use may occur after solar generation declines.
In these cases, equipment scheduling, heating and cooling loads, or storage may influence the final design.
For examples of commercial project delivery, explore our Bunnings warehouse solar installations across Tasmania and the commercial off-grid EPC project at Mount Rumney Escapes.
How to Read Interval Data Without Specialist Software
You don’t need advanced software to begin reviewing your electricity consumption.
Instead, start with a spreadsheet and your interval data CSV file.
Step 1: Open the interval data file
Import the CSV into Excel or another spreadsheet application.
Then, identify the columns containing dates, times and electricity consumption.
Step 2: Compare operating days
Filter the data to show normal weekdays.
Next, create a chart showing average electricity demand throughout the day.
You can also compare weekends and seasonal periods.
Step 3: Highlight the solar window
Mark approximately 10 am to 3 pm as an initial reference.
Then, compare electricity consumption inside and outside that period.
Remember that actual solar generation depends on orientation, shading and seasonal conditions.
Step 4: Identify possible mismatches
If most electricity demand occurs outside daylight hours, a large panels-only installation may need closer examination.
For example, load shifting, battery storage or a smaller solar array could provide a better match.
Alternatively, a business with steady daytime consumption may already have strong alignment between electricity demand and solar generation.
The goal is to understand how solar production and electricity use overlap before choosing system capacity.
How Expert Energy Tasmania Uses Your Interval Data
At Expert Energy Tasmania, we begin by reviewing how your business consumes electricity.
First, we examine interval data to identify daily and seasonal demand patterns.
Next, we compare those patterns with potential solar generation.
We also consider network connection requirements and export limitations.
Matching the system to your business
Sometimes, a modest solar array closely matched to daytime demand is the most practical option.
In other cases, solar combined with battery storage may deserve consideration.
Alternatively, adjusting equipment schedules or reviewing tariff arrangements may be worthwhile before increasing solar capacity.
Working with incomplete data
Not every business has a full year of reliable interval readings.
When information is limited, we’ll explain how that affects the assessment.
We won’t present an uncertain system design as though it were based on complete metering information.
What to Send Us for a Commercial Solar Assessment
Providing useful site information helps us prepare a more accurate assessment.
Where available, send:
Interval data: Ideally 12 months of electricity readings.
Recent electricity bill: Including tariff and network information.
Electrical documentation: Single-line diagram or switchboard photographs.
Roof information: Photographs or a site plan.
Operating details: Normal business hours and seasonal changes.
Future plans: Equipment upgrades or electrification projects.
If interval data isn’t available, we can still begin with electricity bills and a site inspection.
However, we’ll explain the uncertainty associated with those estimates.
Questions to Ask Before Buying Commercial Solar
Before accepting a proposal, ask your installer:
How much of our weekday electricity demand occurs during likely solar generation hours?
What export assumptions are included in the financial model?
How does the proposed system account for seasonal electricity demand?
Would battery storage or load shifting improve the design?
Should we allow for future electrical upgrades?
Would staged solar expansion be appropriate?
These questions can help identify whether the proposal reflects your business’s actual needs.
Why We Avoid Generic Solar Savings Claims
Commercial solar outcomes depend on several factors.
These include electricity tariffs, export arrangements, operating hours and the relationship between generation and consumption.
Therefore, we won’t promise a fixed percentage reduction in electricity bills or an invented payback period.
Instead, financial estimates should come from a site-specific assessment using available electricity data.
A commercial solar proposal should reflect your actual operating conditions, not generic assumptions.
Book a Commercial Solar Site and Energy Assessment
Understanding your electricity demand is the first step towards choosing a suitable commercial solar system.
Whether you operate a warehouse, coolstore, agricultural facility or hospitality business, interval data can help identify practical opportunities.
Contact Expert Energy Tasmania to book a commercial site and energy assessment, or send us your interval data.
We’ll review your electricity demand before recommending system capacity.
Author: Scott Logie · Brand: Expert Energy Tasmania · Last reviewed: 6 September 2026