What are Tier 1 Panels

This is a much debated question.

Things such as build quality, financial stability and/or volume produced and even history beyond 5 years.


Brands such as

REC, ET, Trina, Qcell Panasonic fall into the Tier 1 category.

Will a solar system zero my power bill?

Roughly speaking you need a system size that generates enough power for 2.5 times your power consumption (vic feed in tariff of 8 cents).

A power bill consists of several items usually in some form of:
Peak Power – Daytime usage
Off Peak Power – Night time usage/Weekend usage.
Service to Property charges – Daily fee for poles and wires.

A solar system generates power during the “peak power” period. This means that it is capable of supplying some, or all, of your peak power needs. Any solar system that is large enough can in fact cover this usage. The size solar system required is roughly worked out by “peak power per day divided by 4”.

Your solar system, however, does not work during the night time usage. This means you would have to somehow make extra power during the daytime for this consumption at night.

This extra power you can create is called a “feed in tariff” by energy retailers. In the state of Victoria you can be given 8 cents for every extra kW that your solar system might produce.

So at night if you consume 1kW of power (which might cost you 16 cents per kW). During the day you would have to produce 2kW of excess power to pay for it. In other words the payback cost is, in this case, double for your night time power.

This size, to add to your solar peak usage above, is roughly worked out by “off peak per day divided by 2”.

If you then add a service to property charge, which could be $1 per day, you would have to make an extra 13kW of excess power during the day to offset this cost. 13kW x 8cents = $1.04

To pay for you service to property charges alone you would need to generate 13kW of extra power or 3kW of solar power just on the roof to cover it.

So as an example of a 30kW power bill with 20 kW peak and 10 kW off peak with service to property charges of $1 per day you would need:

(20kW/4) + (10kW/2) + (13kW/4) = Solar System of 13kW for a 30 kW consumption per day.

Are there any Solar Power rebates available?

Both On-Grid and Off-grid (SPS, RAPS) receive a rebate based on the amount of kW of solar that is installed

There was, for a short time,  higher incentives for both types pre 2013. This is now calculated in the same way whether you are On-grid or Off-Grid.

In 2013 the rebate is based on the amount of power expected to be generated from a system. Each expected mW generated has a value of one Renewable Energy Certificate or REC’s. Due to the obvious differences of states like Queensland receiving more sunlight than states like Victoria, the higher states receive higher values of REC’s. The government has separated the country into 4 Zones. These zones are used to calculate STC via postcode On the ORER website.

Our current offer on STC value is located on this site minus 1 dollar.


If the rate is $32 you would receive $31 from us.

What happens to Solar Power in Hot Weather?

You have less power being generated.

Unlike solar hot water, solar PV panels are less efficient when working in hotter temperatures. In fact, they have a specification in the data sheet indicating just how much power is lost. This is represented as a % value of the volts at a temperature rating and called a Temp Coefficient. The temperature rating is calculated when the panels are 25 degrees.

So when buying a panel look at the Temp Coefficient to see what value it has. The lower the temp coefficient the better the panel voltage and the more power you will receive over a panel with a greater temp coefficient when it’s hotter.

Solar panels are hotter than the surrounding, or ambient temperature, by an extra 25 degrees. So on a 15 degree sunny day the panels are already at 40 degrees (15+25=40).

The below picture represents a system for a full day. You will notice as is starts in the day the voltage starts nice and high. As it warms up the voltage slowly decreases. Then towards the end of the day it starts to rise again. This represents a typical day in the life of voltages on a solar system.

Will my Solar PV system work when there is a power blackout?

No power will be generated by the inverter when the mains power is disconnected or off. This is by design to prevent fatal AC voltage going down the wire, from your house, to somewhere else.

This disconnection of the inverter also helps with instability with the mains grid. The inverter can shut down when voltages are too high, stopping them the Grid from being pushed higher again by too many PV systems pushing extra power back.

What is the current Value of STC’s

Our current offer on STC value is located on this site minus 1 dollar.


If the rate is $32 you would receive $31 from us multiplied by the number of STC’s the system is able to receive.

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