Residential Grid Connect System Examples

To get the right size solar system it is advisable to investigate your energy consumption using your electricity bill and/or power meters. Keep in mind that only daytime power usage can be offset with solar.

Save Money

Residential solar systems offer better returns when kept small. If the system is too large, you will end up exporting to the grid at meagre rates (0-10 ¢/kWh). At a buy price of ~30 ¢/kWh you are much better off self-consuming your generated power. As a rule of thumb, a residential system with "minimum exports" would cover about 30% of the average daily consumption of a working family.

Battery Ready

Nevertheless, if you work from home, or if you plan to upgrade to a battery hybrid system at a later stage, it is better to aim at a minimum of 60%. Having more solar panels also means you can cover some of those "spikes" caused by the kettle or vacuum cleaner.

Residents
per household
Average use
per day in kWh*
Min. Size
(best return)
Recom'd size
(battery ready)
1-215 kWh1.8 kW3.6 kW
3-422 kWh2.4 kW4.8 kW
5+29 kWh3.6 kW6.0 kW

*Source: IPART

3.9kW Residential Solar System

sketch of couple

This grid connect system features 12 Trina solar panels with a total of 3960 watts. The panels will generate about 15.8 kWh/day. If you manage to self-consume all of that power, you will save $1903 each year (@ 33¢/kWh).

You will require about 20 square metres of roof space. It should fit on most 2-3 bedroom homes or large carports. On average, installation takes one business day.

Our 3.9kW System:

Trina 330W Solar Panel
Trina Solar

12 Solar Panels

SMA Sunny Boy 3.0 Inverter
SMA Sunny Boy

3000 Watt Inverter

Clenergy ezRack System
Clenergy ezRack

Solar frames built to last

  • 12 x 330W Trina Solar™ Honey Black Module® panels
  • 1 x SMA Sunny Boy 3.0 solar inverter
  • Clenergy cyclone-proof solar frame*
  • DC Isolator (IP66), breakers
  • 10m DC cable, 20m AC cable, signage
  • Installation** within 50km of Nimbin

Our Price (incl. $2040 of STCs), from: $5395.

Get A Quote
* flat-mount solar frame with standard pitch (11-30°) metal roof
** on single storey building

5.2kW Residential Solar System

sketch of 4 member family

This grid connect system features 16 Trina solar panels with a total of 5280 watts. The panels will generate about 21.1 kWh/day. If you manage to self-consume all of that power, you will save $2543 each year (@ 33¢/kWh).

You will require about 27 square metres of roof space. It should fit comfortably on any 3-4 bedroom home or strong shed. On average, installation takes one business day.

Our 5.2kW System:

Trina 330W Solar Panel
Trina Solar

16 Solar Panels

SMA Sunny Boy 4.0 Inverter
SMA Sunny Boy

4000 Watt Inverter

Clenergy ezRack System
Clenergy ezRack

Solar frames built to last

  • 16 x 330W Trina Solar™ Honey Black Module® panels
  • 1 x SMA Sunny Boy 4.0 solar inverter
  • Clenergy cyclone-proof solar frame*
  • DC Isolators (IP66), breakers
  • 10m DC cable, 20m AC cable, signage
  • Installation** within 50km of Nimbin

Our Price (incl. $2720 of STCs), from: $6255.

Get A Quote
* flat-mount solar frame with standard pitch (11-30°) metal roof
** on single storey building

6.6kW Residential Solar System

sketch of 5 person family

This grid connect system features 20 Trina solar panels with a total of 6600 watts. The panels will generate about 26.4 kWh/day. If you manage to self-consume all of that power, you will save $3179 each year (@ 33¢/kWh).

You will require about 34 square metres of roof space. It should fit on most 4 bedroom homes or large sheds. On average, installation takes one business day.

Our 6.6kW System:

Trina 330W Solar Panel
Trina Solar

20 Solar Panels

SMA Sunny Boy Inverter 5.0
SMA Sunny Boy

5000 Watt Inverter

Clenergy ezRack System
Clenergy ezRack

Solar frames built to last

  • 20 x 330W Trina Solar™ Honey Black Module® panels
  • 1 x SMA Sunny Boy 5.0 solar inverter
  • Clenergy cyclone-proof solar frame*
  • DC Isolators (IP66), breakers
  • 10m DC cable, 20m AC cable, signage
  • Installation** within 50km of Nimbin

Our Price (incl. $3400 of STCs), from: $6999.

Get A Quote
* flat-mount solar frame with standard pitch (11-30°) metal roof
** on single storey building

Sizing a grid connect solar system

It is important to know how electricity is used in your home to determine the right size solar system for you. Take a look at the following energy usage graph of a typical Australian household (also showing a well sized solar system to suit):

diagram: energy use in average household wih solar system

On a typical weekday of a working family, energy is mostly consumed in the morning, and then again at night time. These peak periods cannot be offset with a plain grid-connect system unless you add a home battery, which includes another inverter and deep cycle batteries.

Without batteries, an over-sized residential grid connect system mostly results in increased cost for you, and more benefits to the energy retailer as the following graph shows:

diagram: household energy use with large solar system

Please note: energy production is never as schematic as shown in the diagrams above, there will always be "ups and downs". Have a look at Rainbow Power Company's grid production graph of the last two days:

Grid Feed Exports of Rainbow Power Company

We install solar systems in Northern NSW and Southern QLD.


QLD:
Gold Coast (from Coolangatta to Southport), Nerang and Hinterland (Beaudesert) and out West (Warwick, Stanthorpe, Killarney)


NSW:
Northern NSW (Tweed Heads to Yamba, including Evans Head, Byron Bay and Ballina); the Far North Coast Hinterland (Grafton via Lismore to Murwillumbah) and out West (Casino to Tenterfield, including Drake and Tabulam, as well as Woodenbong and Bonalbo)

For larger system we also go up to Brisbane or down to Coffs Harbour and even Glen Innes. Other places by arrangement.

We are Open for Business

Rainbow Power Company would like to assure our customers that we are trading (not quite as normal). System designers are working from home and can customise a quote for you (free of charge) over the phone and online. We are still dispatching and posting items, with safety precautions in place. You can still order online or over the phone, and pick up items from RPC (our show room is closed however, and appointments must be made to pick up orders). We are still doing site inspections, keeping the recommended social distancing.

Contact us

This is the perfect time to start thinking about your power needs for the future, reducing your bills, and safeguarding against future power outages, so call today and get in before the oncoming solar rush. PH: 02 6689 1430 or send an enquiry
..stay safe and healthy, your RPC family