Case Study: Classic 4×2 Family Home

Case Study: Classic 4 x 2 family home


Classic 4×2 family home in metro Perth with a family of 4.  The family wanted to make a dent on their electricity bill that peaked in the summer months to $900 for a 2 month period.  Whilst at the home it was noted that there were numerous light fixtures that had incandescent globes and a ducted reverse cycle air-conditioning system. 

As no previous solar system had been installed there was roof space room for the max array to feed a 5kw inverter.

The existing 48 incandescent light fittings had a total full load of 2010 watts. Over a year the total usage and cost was 3712.50 KWH @ $0.25752/kwh = $956.04 per year.

The ducted reverse cycle air-conditioning unit was rated at 14 kw of cooling.  The unit was gassed with R410A refrigerant and it’s estimated the system would cost around $1287.60 per year to run.

We were able to offer the client a renewable energy solution which included solar panels, eco lighting and re-gassing the air conditioning unit. Giving the family the opportunity to significantly reduce their current usage.


The roof had good orientation and room for 6.4kw array and 5 kw inverter to produce an average of 29 kwh of power per day across the year.  Without metering the home over a typical one week period it is difficult to determine their usage at different times to determine how much power would be feeding back to the grid.  A conservative estimate would be that they would gain $400 back on to their bill over the period of 1 year.  The conservative saving on what the client would use of their produced energy from the solar would give them a further average saving of $1104.66 on their current bill.  The total minimum saving by installing a solar system is $1504.66.

By changing the current incandescent lighting to LED fixtures we reduced the total load from 2010 watts to 598.41 watts.  Reducing the usage by 2754.8 kwh which equates to a saving of $709.41 per year.

The last thing to do is to safely extract the existing R410A refrigerant from the air-conditioning system and refill it with a hydrocarbon replacement.  Changing the gas not only dramatically reduces wear and tear on the system but the immediate effect is a 35% energy consumption reduction on the system.  In this instance it equates to a saving of a further $450.66 per year.

We were able to save the family $2664.73 per year.

The fortnightly repayments on the renewable energy solution would be $146.48 based on 36 month finance option or $94.57 on 60 month.

What people are saying

Colin – Riverton

Greg helped us when our solar system stopped working. He was very helpful and knowledgeable on solar and I was surprised how much there was to know about upgrading our system, but also to keep within the rebate rules. I believe that due to Greg’s knowledge we got great value with the repairs, and his installation staff were very polite. We also discussed the future with regards to addition of batteries, and we will be using Greg again in the near future when the time and pricing is right with battery systems, with Greg helping us with load draw monitoring and designing a system to suit.

Colin - Riverton

Russell – South Guildford

The whole procedure and service was exceptional. Professional and courteous from the office and tradesmen. No mess and always ready to answer follow up questions. I would always recommend these guys.

Russell - South Guildford

Libby – Mount Richon

They were quick, thorough and very pleasant and honest people to have working at my home.

Libby - Mount Richon

Peter – Haynes

We have had the team from Belenus out to our house a number of times. Each time we have used Belenus they have been fast, neat and finished the job with minimal fuss. Their advice on solar was spot on and competitively priced. I would recommend them for any electrical job, big or small.

Peter - Haynes

Giulio Petrucci

Good friendly service. Neat and tidy. I would recommend Belenus to anyone who is interested  in installing solar panels at their place. 100% happy , satisfied. Job well done . Thankyou to the Belenus team.

Lesley – East Victoria Park

I have had a number of small jobs completed at home and I’ve found Greg & his team at Belenus Pty Ltd easy and a pleasure to deal with.  I highly recommend them.

Debbie – partiesforfriends and fyieverybodycooks, Haynes

The team at Belenus Pty Ltd are fantastic.  Nothing I asked for was a problem and when I threw them a curve ball about having a black powerpoint, it was a case of “we’ll just have to order it in”.  By installing our solar panel system, Belenus Pty Ltd has helped us start to meet our social responsibilities in relation to the environment as well as save the businesses money on our energy bills.

Debbie Harrison

Palmers – Dianella

Recently we decided it was time we had solar installed. On a recommendation we contacted BELENUS PTY LTD.  We spoke to a young man called Greg who owned the company.  He paid us a visit explained the solar system in a manner we could understand.  Quoted us a price which was reasonable and comparable with other companies.  Once the installation commenced we were delighted with the speed and efficiency.  The young workmen they sent to install the panels etc. were clean working and very obliging.  The work was completed with no disruption to our daily routine. We would not hesitate to recommend Belenus to anyone wanting to install solar.  A big thank you fellows!

Palmers of Dianella