There are many misconceptions about renewable energy. It is, for instance, intrinsically wrong to invest in photovoltaics before you have taken all possible measures to reduce your consumption. Some of these measures are simply replacing lighting to a more efficient one, changing electric cooking to gas where possible, heating water more efficiently using boiler timers, gas or thermodynamic heating, voltage optimisation, insulation, air leakage (ventilation) and others just to mention a few.
Once you have implemented all energy saving measures, then it is the opportune time to generate your own energy to completely offset electrical usage at home, if not also the cost of water and meter rent.
Here are a few facts that you should know and take into consideration before investing into a PV system.
A PV system has three main components: the PV module, inverter and mounting structure. The inverter can be a micro inverter (an inverter per PV module), string inverter (one inverter for an array of modules), and central inverter (a group of connected string inverters used for large systems).
A string inverter has all its PV modules connected in series. This means that if one module is not working or is in the shade all the other modules will shut down or switch off.
Most roofs in Malta have all sorts of shading – having micro inverters instead of string inverters will eliminate all shading problems and maximise energy production. With micro inverters you can potentially gain up to 20 per cent more production when comparing to string inverters.
PVs are more affordable than you think. With micro inverters you can just start by installing one PV module and grow the system as your budget requires.
PV monitoring software is very important as you can take full control of what your system is producing. It will also help you find and rectify potential issues.
Micro inverters typically have a warranty of 20 years. Most string or single inverters range between five to 10 years.
A PV system will not directly reduce your electricity bill, but will offset the energy purchased by putting back green energy into the grid.
In Malta, the best inclination for PVs is at 30 degrees. Other settings like 15 degrees or 20 degrees are good, but will reduce the yearly energy yield.
Malta is windy, therefore you should always get good advice on the wind loading of the structure.
It’s more financially wise to put your savings in PV systems rather than typical bank interest. Bank interest can be about four to five per cent, while the payback percentage of PV investments can be as much as 12 to 25 per cent.
PV systems need to be maintained. At minimum they need to be cleaned periodically. Dirty PVs will lose about four per cent power.
For more information on how to reduce and completely eliminate you electricity bill contact Power Solutions on info@powersolutions.com.mt, freephone 80074906, 2148 0500 ext. 115, 9943 0445 or visit www.powersolutions.com.mt.