Heat Pumps with Solar Power
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Why Perth Residents are Combing Heat Pumps with Solar Photovoltaics (PV)

Solar Power has made great inroads onto residential roof tops over recent years. Savvy consumers are looking at ways to be more Energy Independent. A recent trend has seen a many Perth Homes disconnect their gas supply and install induction cook tops and heat pumps. This article looks at why heat pumps work so well with solar PV.

Heat Pumps compliment Solar Power: 

  1. heat pumps have a minimal and controlled known amount of power draw.  These units can easily be timed during peak solar generating hours.
  2. heat pumps take up zero roof space.  This leave more roof real estate for solar power.
  3. heat pumps act like a thermal battery, storing the Energy (via hot water) for when you need it i.e. evening/morning showers
  4. under the current WA Feed-in Tariff there is no encouragement to sell your renewable power i.e. you are best using it!


Our products can work in-conjunction with solar via these means:

  • Bosch Compress 3000
    1. Use supplied inbuilt programmable timer to control on-duty period. A minimum on-duty time would be 6hrs per day
    2. Buy a PV Signal Electrical Connect Box. This is only compatible with certain inverters
  • Stiebel Eltron
    1. Install a timer in the electrical circuit for the heat pump. A minimum on-duty time would be 6hrs per day
    2. Buy a PV Signal Electrical Connect Box. This is only compatible with certain inverters
    3. Connect to an Energy Management System
  • Sanden Eco
    1. Under standard condition this will come on at 10am to heat the full tank to ~65C (takes ~3hrs). It will only come on again before 10am if there is only ~100litres of hot water left. It's job is to ensure you never run out of hot water
    2. Modify the above so it does its cycle at a different time
    3. Using the internal 'block out' period on the unit (we recommend using option 2 over this function to ensure continuity of hot water supply)



Solar Hot Water Orientation PerthBut traditional solar hot water is Free From the Sun?

Well that's what the advertising says right! Traditional solar has two distinct disadvantages with solar power:

  • yes it's free in Summer, Autumn and Spring. But when traditional solar hot water needs boosting in winter there is a large power draw, 3-4 times that of heat pumps. This is also when the solar power is working less effective and thus the energy hungry booster will draw from the grid.
  • under the new Plumbing Code of Australia (adopted by the WA Plumbing Licence Board May 2016) solar hot water is restricted to being installed within the range of North +/- 45⁰. The result is prime North roof needs to be used for solar hot water......less space for Solar PV.


Why don't you install an electric hot water system with solar power?

Installing a large electric storage system on a timer is ill effective as this would generally consume more power than the solar PV system can generate.  You would in effect have just bought an expensive solar power system for one purpose.....to heat your hot water.