302L Roof Top Solar: Key Attributes
The L Series is ingenious in its simplicity. The black polyester powder coated aluminium absorber collects the sun's heat and transfers it to the water in the 7 risers. Copper is used for the risers for its high thermal conductivity ensuring the maximum amount of heat energy is passed to the water. As the water in the risers is heated, it rises into the tank to be replaced by cooler water from the tank. The solar heated water is then stored ready for use - hot water free from the sun.
The L Series has a ceramic lined tank with a protective sacrificial anode. The L Free Heat features additional anode protection.
- Stylish slimline roof mount design
- Can cut water heating energy use by up to 65%^
- Reliable, low maintenance operation
- Eligible for Government rebates and incentives
* The suggested price is comprised of RRP less the applicable solar incentive and excluding installation. Solar incentive value applies to 302L system in Zone 3.
^ Energy savings of up to 65% shown is based on Australian Government approved TRNSYS simulation modelling of a Solahart 302L and using a medium load in Zone 3 and apply when replacing an electric water heater. Any savings and incentives will vary depending upon your location, type of Solahart system installed, orientation and inclination of the solar collectors, type of water heater being replaced, hot water consumption and fuel tariff. Maximum financial savings off your hot water bill are achievable when replacing an electric water heater on continuous tariff.
† Solahart Warranty Details: 5/5/5 warranty; 5 year cylinder and collectors supply, 5 year parts, 5 year labour. 10/5/5 warranty, 10 year cylinder and collectors supply, 5 year parts, 5 year labour.
302L Solar Specifications
|Tank Model||300L Tank||302L System|
|Storage Capacity||300 Litres||300 litres|
|Boost Capacity (Electric)||150 litres||150 litres|
|Weight Empty||91 kg||156 kg|
|Weight Full||391 kg||460 kg|
|A-Width||2.43 m||2.48 m|
|B-Length*||0.51 m||2.53 m|
* For servicing and safe access, a space equal to the tank length should be left on the water connection end of the system and 1m (40in) should be left on the three other sides of the installation. The L and L Free Heat systems (if installed with a TRV system) can be installed as a solar preheater with a Solahart inline gas booster water heater. Refer to the Solahart gas booster specification sheet for further details on the gas booster.
|Aperture (heating) Area||1.87 m2|
|Working Pressure||1000 kPa
|Absorber Surface||Black polyester powder coat|
|Riser Material||copper tube|
|Tray Material||0.7 mm aluminium|
|Insulation Material - Base||38 mm polyester blanket|
|Glass||3.2 mm tempered low iron glass|
*Weight includes fittings
|Electric Boost Specifications|
|Heating Unit Type||Cooper sheath immersion element|
|Supply Voltage||240 V -250 V|
|Recovery Rate (litres/hour) @ 240V and Temperature Rise of:|
|TPR Valve Setting||1000 kPa
|ECV* Setting||850 kPa
|Max. Supply Pressure|
|With ECV||680 kPa|
|Without ECV||800 kPa|
|Cold||DN15 compression fitting|
*Expansion Control Valve.
How Roof Top Solar Systems Work
The 302L solar system has its vitreous enamel lined solar storage tank installed on the roof directly coupled to the solar collectors. It works on the simple scientific fact that hot water rises. As the sun heats the water in the solar collectors, the increase in temperature causes the water to rise through an insulated copper pipe into the storage tank. Copper is used for the risers for its high thermal conductivity ensuring the maximum amount of heat energy is passed to the water. This allows cooler water from the solar storage tank to flow into the solar collectors to be heated by the sun's energy. This process continues while solar energy is available.
The L Series has a ceramic lined tank with a protective sacrificial anode. The L Free Heat features additional anode protection. L and L Free Heat systems can be installed with an optional TRV over temperature protection system to prevent over performance during periods of higher solar radiation and lower hot water draw off.
Orientation of Solar Collectors
To help maximise system performance, solar collectors should be installed with an optimum orientation facing true north (in the southern hemisphere) or true south (in the northern hemisphere). Always check for true north or true south using a compass or other suitable device.
To help maximise system performance, solar collectors should be installed with an optimum inclination. This is equal to 90% to 100% of the local latitude angle when collectors are oriented within 60° of true north or true south, and between 10° and 20° if the collectors are oriented between 60° and 90° from the optimum orientation. Generally, improved summer performance is obtained from an angle of inclination less than the optimum angle and improved winter performance is obtained by an angle of inclination greater than the optimum angle. If the angle of inclination varies by 20° from the optimum angle, the solar collectors will receive about 10% less total annual solar radiation.
An Open Circuit system does not have freeze protection and is not suitable for installation in areas prone to freeze conditions. Freeze conditions occur below 5°C (41°F). This system has NO WARRANTY for freeze damage. In areas that are prone to frost / freezing, a Closed Circuit system should be used.
An isolating switch is installed in the electrical meter box for an electrically in-tank boosted model. This should be left switched on to allow the booster heating unit to operate if required. The booster heating unit is for heating the water at times of low solar energy gain, such as during very cloudy or rainy weather, or during the colder months. The booster heating unit will only activate if heating is required and power is available from the switchboard. When the water is below the thermostat setting, the booster heating unit will turn on and heat the water. The booster heating unit will automatically turn off when the temperature of the water reaches the thermostat setting. If the water temperature drops below the setting again the booster will re-activate.
In-Series Gas Boosting
An in-series gas booster (also known as a continuous flow gas booster) can be installed between the solar water heater and the hot outlets in the house. This booster should be permanently active. The booster senses the temperature of the water passing through it: if the water temperature is above its temperature setting it does nothing; if below it will automatically heat the water up to the preset outlet temperature setting. This device ensures hot water delivery for a variety of hot water demands without the need for user intervention while enabling maximum solar energy contribution to the water heating. For more information on this booster, consult the owner’s manual for the product.
Over-Temperature Protection System
The Open Circuit Series systems may be installed with a ‘TRV’ thermosiphon restrictor located between the cold inlet of the tank and the cold inlet of the collectors. This valve restricts the flow through the collectors when the tank has reached a sufficiently high temperature.
Why Solahart Solar Hot Water Systems: Download
Solahart 302L Solar Hot Water System Brochure: Download
Solahart In-Line Gas Booster Brochure: Download
Solahart On-Roof Solar Hot Water System Owner's Guide and Installation Manual: Download
Solahart In-line Gas Booster Owner's Guide and Installation Manual: Download
Solar Incentive Forms
Small-scale Technology Certificate Assignment Form: Download