Choosing a Solar Solution in Fiji: How to Assess Your Daily Electricity Needs Before Installation

Choosing a solar solution in Fiji starts with understanding how much electricity your property uses and when that electricity is needed.

Two homes with similar monthly bills may have different requirements. One might use most of its electricity during daylight hours, while another relies heavily on lighting, cooking appliances and air conditioning after sunset.

Businesses also have different consumption patterns. An office, retail shop and refrigeration facility may need very different system designs, even when their total daily electricity use is similar.

Before comparing solar packages, prepare a clear picture of your daily consumption, equipment demands and backup priorities. This gives the installer useful information for assessing a system suited to your property.

Power and energy describe different parts of your electricity needs.

Power, measured in watts or kilowatts, describes how quickly equipment uses electricity.

Energy, measured in watt-hours or kilowatt-hours, describes how much electricity it uses over time.

For example:

• A 1,000-watt appliance uses power at a rate of 1 kilowatt.
  • If it operates continuously at that level for two hours, it consumes 2 kilowatt-hours.

Energy use in kWh = Power in watts × Operating hours ÷ 1,000

Solar panel capacity is commonly expressed in kilowatts, while daily electricity consumption is expressed in kilowatt-hours. These figures should not be treated as interchangeable. energy.gov.au

Gather several recent electricity bills, ideally covering a full year where available.

Look for the electricity consumed in kWh, rather than relying only on the amount paid.

The bill total can include charges that do not directly represent energy consumption. A change in spending may also reflect pricing changes rather than increased usage.

Record:

• Billing period.
  • Number of days covered.
  • Electricity consumed in kWh.
  • Whether readings are actual or estimated.
  • Any unusual operating conditions.

For businesses, also identify whether the account includes demand-related charges or other pricing components that need separate assessment.

<h3>A Simple Daily Consumption Example</h3>

Suppose a bill records:

• Electricity consumption: 450 kWh.
  • Billing period: 30 days.

Average daily consumption = 450 ÷ 30

Average daily consumption = 15 kWh

This provides a starting point. It does not show the busiest day, the highest simultaneous demand or how much electricity is used at night.

Create an inventory of the equipment the proposed solar system may need to support.

For a home, this might include:

• Lighting.
  • Fans.
  • Refrigerators and freezers.
  • Televisions.
  • Washing machines.
  • Water pumps.
  • Cooking appliances.
  • Air conditioners.
  • Computers and internet equipment.

For a business, include relevant equipment such as:

• Refrigeration units.
  • Office computers.
  • Workshop machinery.
  • Commercial kitchen appliances.
  • Pumps and motors.
  • Security systems.
  • Networking equipment.

Record the number of devices, their input power and their typical operating hours.

For equipment with reasonably steady consumption, multiply its power by its operating time.

The following figures are illustrative only:

This subtotal excludes refrigeration, cooking, cooling and other appliances.

Replace the example figures with measurements or reliable information for your actual equipment. The US Department of Energy describes this wattage-times-operating-hours approach as a starting point for estimating daily loads.

Not every appliance uses its rated input power continuously.

Refrigerators, freezers, air conditioners and thermostatically controlled equipment change their consumption during operation.

For example, multiplying a refrigerator’s rated power by 24 hours can overestimate its daily use because its compressor may not run continuously.

Better sources of information include:

• Suitable energy-meter measurements.
  • Manufacturer consumption data.
  • Appliance energy labels.
  • Existing monitoring records.
  • Professional load measurements.

For air conditioners, distinguish electrical input power from cooling capacity. A cooling rating does not directly state electricity consumption.

Daily totals are useful, but the timing of consumption also affects system design.

Divide your estimated usage into periods such as:

• Morning.
  • Main daylight hours.
  • Evening.
  • Overnight.

An office using computers and cooling during the day may consume more solar electricity as it is generated.

A home with substantial evening use may need a different arrangement involving the grid, storage or both.

Battery storage can make solar energy available later, but its suitability depends on the load profile and system design.

Ask the installer to explain how the proposed system matches your actual consumption pattern.

A daily energy total does not establish the inverter power required.

Consider which appliances may operate at the same time.

For example:

• Kettle: 2.0 kW.
  • Microwave electrical input: 1.2 kW.
  • Water pump: 0.75 kW.
  • Other operating equipment: 0.55 kW.

Combined running demand = 4.5 kW

This example excludes additional starting demand.

Even if these appliances operate briefly, their combined demand can affect inverter selection and backup-circuit planning.

Pumps, compressors and some other motor-driven devices can require more power when starting than during normal operation.

Record the model details of equipment such as:

• Water pumps.
  • Refrigeration compressors.
  • Air conditioners.
  • Workshop motors.
  • Processing machinery.

Ask the installer to assess starting requirements alongside running loads.

The system must be evaluated for both the size and duration of these demands. A continuous power rating alone does not describe every operating condition.

9. Decide What Must Operate During an Outage

Separate your normal electricity needs from your backup priorities.

Essential loads might include:

• Selected lights.
  • A refrigerator.
  • Internet and communication equipment.
  • Security equipment.
  • A necessary water pump.
  • Selected business systems.

High-consumption appliances may need to remain outside the backup arrangement or operate under an agreed load-management plan.

Define:

• Which equipment needs backup.
  • How long it must operate.
  • Which devices may run together.
  • Whether interruptions are acceptable.
  • What alternative arrangements exist.

Critical healthcare or other safety-related loads require a dedicated professional reliability assessment.

10. Understand Battery Energy and Power Ratings

Battery selection involves two separate questions:

1. How much usable energy can it supply?
2. How much power can it deliver at one time?

A battery may store enough energy for several hours of modest consumption but still be unable to run a large appliance.

The Department of Energy distinguishes storage energy capacity, commonly measured in kWh, from power capacity, commonly measured in kW.

For a simplified example:

• Average essential load: 0.4 kW.
  • Required operating period: 8 hours.

Energy delivered to loads = 0.4 × 8 = 3.2 kWh

The installed battery requirement must also account for conversion losses, reserve settings, usable capacity, operating conditions and ageing.

This calculation is a starting point for discussion, not a battery-size recommendation.

11. Include Seasonal and Business Changes

Consumption can change throughout the year.

Consider:

• Increased cooling during hotter periods.
  • Changes in household occupancy.
  • School or public holidays.
  • Longer business operating hours.
  • Seasonal production.
  • Additional refrigeration demand.
  • Weekend versus weekday use.

Review the periods when higher electricity demand may coincide with lower solar generation.

An off-grid system needs particular attention to these conditions because it cannot rely on the electricity grid to cover a shortfall.

12. Record Future Equipment Plans

Tell the installer about expected changes before the system is designed.

These might include:

• Another air conditioner.
  • Additional refrigeration.
  • An electric vehicle.
  • A new water pump.
  • More computers.
  • Longer operating hours.
  • Building extensions.

Identify which plans are confirmed and which are only possibilities.

Ask whether expansion is technically supported and what changes it would require. Adding panels later may also require changes to the inverter, battery, wiring or connection arrangements.

Compare Grid-Connected, Hybrid and Off-Grid Needs

Your load assessment helps establish which system arrangements should be evaluated.

Ordinary grid-connected solar generally shuts down during a grid outage. Backup requires equipment and electrical arrangements specifically designed for that function.

A battery does not automatically mean that every circuit will remain powered.

Assess the Installation Site in Fiji

Electricity needs must be considered alongside the actual installation location.

Ask the provider to assess:

• Roof condition and usable area.
  • Shading.
  • Orientation and tilt.
  • Structural mounting requirements.
  • Wind and cyclone exposure.
  • Coastal corrosion exposure.
  • Cable routes.
  • Inverter and battery locations.
  • Flooding and moisture risks.
  • Access for maintenance.

Do not assume that a system suitable for another property will produce the same results at your site.

Use Site-Specific Solar Production Estimates

A daily consumption figure cannot be converted directly into a final panel size without generation assumptions.

The estimate should account for:

• Local solar resource.
  • Seasonal variation.
  • Roof orientation.
  • Shading.
  • Temperature effects.
  • Equipment efficiency.
  • System losses.
  • Battery charging requirements, where relevant.

Ask for estimated monthly generation, the assumptions used and how the system performs during less favourable conditions.

Avoid treating daylight hours as equivalent to hours of full rated panel output.

Confirm Connection and Export Arrangements

For a property connected to the EFL network, confirm the applicable requirements before installation.

Ask the provider to clarify:

• Required applications and approvals.
  • Permitted connection arrangements.
  • Metering requirements.
  • Export permissions or limits.
  • Inspection responsibilities.
  • Any applicable export-payment terms.

Do not assume surplus electricity can be exported or credited without confirmation.

EFL states that electrical connection work is subject to inspection and compliance with its installation, wiring and safety standards. Solar-specific arrangements should be confirmed for the proposed project.

Questions to Ask Before Accepting a Solar Quote

Ask the provider:

• What daily consumption figure did you use?
  • How did you estimate daytime and night-time demand?
  • Which appliances can operate together?
  • Have motor starting demands been assessed?
  • What generation assumptions support the proposal?
  • Which circuits receive backup?
  • What battery capacity is usable?
  • What are the backup power limits?
  • What happens during prolonged cloudy weather?
  • Which approvals, inspections and maintenance services are included?

Request clear answers linked to your load assessment.

A package price is easier to evaluate when its capabilities and limitations are documented.

Common Assessment Mistakes to Avoid

Common mistakes include:

• Using only the bill amount instead of kWh.
  • Treating average daily consumption as peak demand.
  • Ignoring night-time use.
  • Assuming appliance labels show actual daily consumption.
  • Overlooking motor starting requirements.
  • Comparing battery capacity without checking power output.
  • Assuming solar automatically provides outage backup.
  • Ignoring seasonal changes.
  • Assuming export credits will cover all remaining costs.
  • Choosing a system before defining essential loads.

A useful assessment considers energy, timing, simultaneous demand and reliability together.

Preparing a Solar Enquiry for More Grow Group

When discussing a solar solution in Fiji with More Grow Group, provide:

• Property location and building type.
  • Recent electricity bills.
  • Typical operating hours.
  • Main appliance and equipment details.
  • Estimated daytime and night-time consumption.
  • Essential backup loads.
  • Desired backup duration.
  • Known roof or shading concerns.
  • Future equipment plans.
  • Available budget and project timing.

Ask More Grow Group to confirm the assessment, design, installation and support services available for your location.

Request a written proposal explaining the load assumptions, expected generation, backup capabilities and applicable connection requirements.

Building a Solar Plan Around Your Electricity Needs

A suitable solar proposal starts with reliable information about how your property uses electricity.

Bills help establish consumption history. Appliance records and measurements explain daily use, while operating schedules reveal when electricity is needed.

Combining this information with a site assessment gives your provider a stronger basis for evaluating panels, inverters, batteries and backup arrangements before installation.