Learn how to use heat pumps as a battery!
Got Solar? Use Water as a Battery!
Recently Australia reached a milestone of 3-million solar systems installed on homes & businesses. That’s more than 1 in 4 houses!
Unfortunately, for many WA households, a large part of their solar power gets exported to the grid for a measly 2.5c/kWh feed-in tariff. only to later repurchase it from the grid in the evening for 30c/kWh. What a scam!
Not surprisingly, many solar system owners are wondering how they can avoid this…
Shifting electricity usage into the daytime is one strategy we recommend. For example, running the pool pump, washing machine and dishwasher during the day instead of night. But even then, many families still have high night-time electricity usage.
Another solution gaining popularity are Home Energy Storage Batteries. At Positive Energy Solutions more than 1 in 3 of our customers are now purchasing a Battery with their new Solar Panel System. Our most popular options being:
- Huawei LUNA2000
- Sungrow SBR
- QCells Q.Home
- Tesla Powerwall
- Sonnen Battery
- And the Fronius+ BYD combination
For some customers though, battery prices don’t quite fit the budget. There is, however, a much more affordable way to store some of that excess solar energy…
1. A fan draws in air, containing ambient heat energy, which blows across the evaporator.
2. The evaporator turns the liquid refrigerant into a gas (CFC Free R134a)
3. The compressor pressurizes the gas making it very hot.
4. The hot gas inside the condenser coil (wrapped around the tank) heats the water inside
5. After transferring the heat to the water tank. Then the refrigerant gas turns back into a liquid. Finally returning to the evaporator for the process to start again.
6. The cycle continues until the water reaches temperature.
7. The cycle will restart if the water temperature inside the tank drops below 45°C while the water
Heat Pump Economics
If you currently have a Gas hot water system, an iStore Heat Pump is a very sensible investment. Especially if your current hot water system has a low star rating or is due for replacement anyway.
Like grid electricity, gas prices are also increasing. Currently, the price of gas in WA is equal to 15.35 cents/kWh.
So, rather than selling your excess solar power to the grid for only 2.5c. You can use that power to heat water cheaper than by using gas. This change boosts the value of your excess solar power by at least 5 times.