The Joule Navitas on-roof solar panel is a superior manufactured on-roof solar collector. The on-roof panel is manufactured using a patented design which improves ventilation through the collector thus reducing stagnated heat in the collector and in turn increasing the collector’s efficiency. Unlike most collectors today the Joule Navitas collector is made up of a selective coated copper absorber and copper pipe array. The advantage of using a copper absorber instead of aluminium absorber along with a copper pipe array is the weld between the two materials has a longer life span when the materials are identical. While aluminium is a cheaper metal to purchase the ultrasonic weld between aluminium and copper is not as robust as it is between copper and copper. Also when considering thermal expansion identical materials expand and contract at equal rates ensuring even forces being put on the welds helping to increase the lifespan of the collector.

No. of People	System Size	Min. Cylinder Size	Kwh Output	Download File
1-2	2	250L	1,563.88Kwh	OP2.pdf
3-4	3	300L	2,178.07Kwh	OP3.pdf
5-6	4	400L	2,965.59Kwh	OP4.pdf
7-8	5	500L	3,696.32Kwh	OP5.pdf

The energy from the sun is absorbed through a selective coated copper absorber. This energy is transferred by conduction to the copper pipe array inside the collector and the heat is then transferred to your hot water cylinder by means of a circulating pump.    The sleek look of the Joule Navitas on-roof panel ensures that the panel adds not just value to your property, but increases your energy rating and saves you money by producing hot water most of the year round.

Navitas On-Roof Collector Glass Construction:
The Joule Navitas On-Roof solar collector is manufactured using Pilkington Solar E Low-E coated glass which is designed to transmit the maximum possible amount of visible light, absorb and reject the maximum amount of solar infra-red energy, and reflect the maximum amount of long wave (room temperature) infra-red energy (far I.R.), all with a hard, durable pyrolitic coating.

Pilkington Solar E Low-E coated glass works, year round, to save energy in 2 ways: 

During a summer day, the coating absorbs nearly half of the sun’s energy shining onto it.  This absorbed energy, which then heats the glass, is restricted from passing on into the building by the low emissivity property of the Solar E coating which only radiates long wave infra-red heat with 15 % efficiency, as compared to non-coated glass which radiates with 84% efficiency.  For this effect to take place the coating needs to be on the #2 surface of the glass, whether it is single glazed or in a sealed double glazed insulating glass (IG) unit.  (Note: Glass surfaces are conventionally numbered, starting at the outside, with surface #1.  Rain falls on the #1 surface.) 

During the winter heating season, a room at 70 F radiates energy in the far IR (maximum radiation occurs at around 10 micrometer wavelength).  A non-coated glass surface facing a warm room readily absorbs 84% of the radiant heat that is directed towards it.  The glass becomes warm and then re-radiates this absorbed heat on out towards the cold exterior.  A Pilkington Solar E low emissivity coating, on the #2 surface of single glazing or of an IG unit, only absorbs 15 % of this valuable room heat.  The balance of 85% of the radiant heat is reflected back towards the room and so significantly reduces overall the heat loss.