Solar Photovoltaic (PV) is a technology that converts sunlight (solar radiation) into direct current electricity by using semiconductors. When the sun hits the semiconductor within the PV cell, electrons are freed and form an electric current.
Solar PV technology is generally employed on a panel (hence solar panels). PV cells are typically found connected to each other and mounted on a frame called a module. Multiple modules can be wired together to form an array, which can be scaled up or down to produce the amount of power needed.
No, the heat pump doesn’t directly require sun like a solar system does, therefore it can run at night or day.
Yes, the heat pump should be serviced yearly by a heat pump technician to increase the lifespan of the heat pump. Re-gassing of a heat pump is a common maintenance requirement
Very little maintenance is needed. The system should be checked for any visible leaks and the solar collector should be kept clean. The heat transfer liquid (dilution of glycol and water) in the Indirect System must be topped up if there has been a leak and the changed every two to three years.
The array of solar vacuum tubes are more efficient, as the tubes are round and the sun rays will start heating the system earlier in the morning. A tube system also allows for the installations to face up to 40°C east or west where the flat panel has to face true north.
Yes you still need a geyser. The heat pump is not an instantaneous water heater. The geyser becomes a storage vessel and a back-up heat source should the heat pump fail.
An inverter changes DC power from a battery into conventional AC power. IE. From your battery (DC) to your main supply (AC).
A Pure Sine wave inverter produces cleaner power and will not damage your equipment, whereas a modified sine wave can do long term damage to your appliances and some appliances may not work at all.
A good inverter will have the following:
Pure sine wave
At least 3 stage battery charge control
Depth of Discharge control
Adjustable charge control
Seamless change over
This is totally dependent on the peak load that is needed. It is important to do a proper load analysis when deciding what size inverter is needed.
1 evacuated tube caters for 10L of water, so if you have a 150L geyser, you will need a 15 tube system
Yes, this in fact provides the best savings and most efficient manner of generating hot water
Solar panels rely on sunlight to produce power. On a cloudy day there is a lot less sunlight however the panels will still receive some sunlight and will generate between 10 - 25% of the capacity depending on the density of the clouds.
Savings will depend on the average ambient temperature where the heat pump is installed. If you look at the average temperature in South Africa of 22 degrees, a heat pump will use 1KW of energy to produce 4KJ of heating energy. This equates to savings up to 75% of your hot water generation costs.
The solar geyser is installed at a higher plane than the solar collector. The basic principles of physics come into play where a liquid is heated it becomes less dense and rises, creating a thermosyphon circulation of the liquid between the solar geyser and the solar collector.