Solar hot water heating Panel Angle

How To Calculate The Optimal Angle And Direction Of Your Solar Water Heater Panel

What is the best roof angle for solar panels.?
This is the most important aspect of your solar collector output as these two angles will affect the solar collector efficiency and the amount of hot water you receive.
For maximum solar panel performance angle in the southern hemisphere which this page is based upon, solar collectors should face north.
Northern hemisphere solar collectors should face south. Clear any trees and check the solar collector isn't shaded by buildings or nearby trees, particularly in winter when the sun is low in the sky.
For peak performance solar panels need to be installed at roughly the same angle as the latitude of your site, thus
allowing to maximize the amount of sunlight falling on the solar panel.
Roof penetration will be necessary, care should be exercised so as the integrity of the roof is not compromised.

How To Calculate The Latitude Where You Live
Simply enter your city or town into with "latitude", for examples see next paragraph

Example Of Solar Panel Angle At Your Location
Great Barrier & Waiheke Island New Zealand have a latitude of 36 degrees south-therefore the solar panel should face solar North at an angle of 36 degrees, the location of both of these islands are off-grid & isolated, making ideal locations for alternative energy specialists like to talk to customers about the benefits of installing solar water heating.
Wellington, New Zealand has a latitude of 41 degrees south-therefore the solar panel should face North at an angle of 41 degrees.
Auckland, New Zealand has a latitude of 36 degrees sth-therefore the solar panel should face North at an angle of 36 degrees.
This angle doesn't have to be exact about mounting the solar collector at the suggested angle, the added trouble of adjusting the collector to the exact angle isnt warranted as it will not result in a great improvement in collection efficiency.
For best winter collection, solar collectors should be installed at an angle 5 to 10 degrees greater than the angle of latitude at your site.
Roof angles in New Zealand or Australia are commonly 20-35 degrees.
The financial outlay is lower and usually more aesthetically pleasing to install collectors flush with the roof, rather than use support frames to achieve an increased angle.
Performance in winter may be slightly reduced, but the benefits usually outweigh the cost.

Keeping within the 20 degrees either side of North or South, depending on which hemisphere you are in will produce the best solar collector results.
This procedure to correctly install your collector angle is without a doubt the single most important aspect of the installation, closely followed by the the distance between the cylinder and the solar collector, the controller settings, plus the quality of installation.

Insolation In Your Area
Not to be confused with insulation.
SolarView Link
This calculator estimates the solar energy that can be collected by a solar receiving device (solar panel) at your selected address, panel direction and roof slope.
Use Find Address or click a location on the map.
Optionally enter, panel tilt and bearing. Default = Your Latitude and North.
Add a Title and click the 'Create SolarView' Button
Click desired map location

How To Calculate The Number Of Solar Tubes
When determining how many solar tubes you need, you have to consider three key factors.

1. Insolation level in your location.
2. Energy requirements.
3. Collector panels can usually only be purchased in banks of 20 / 24 / 30 or combinations of.
4. Custom builds require 8-9 litres of water storage per solar tube, this ratio will help avoid overheating.

Energy requirement will usually take into consideration the volume of water and the rise in water temperature required.
The bigger solar collector you have, the more hot water and rise in temperature, but you should make an economically sound decision.
Generally it is wise to select a size which will provide you with 90-100% of your hot water needs in the hottest months.

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