• Azimuth of solar panels: As a rule of thumb, areas in northern hemisphere will always have south facing panels and vice versa. Make sure your roof is not too old, south facing and clear of shading.
  • Technology of panels: Make sure you acquire high quality, internationally approved panels with industry leading warranties. Minimum approvals should be: MCS (UK), TUV, CE, IEC 61215, IEC 61739, UL, ISO-9001 & ISO-14001. Junction box should be IP65 rated and TUV approved
  • Quality of installation: All solar PV installations should be carried out by properly trained professionals. Our local (non UK) installers are trained by UK’s MCS accredited installers
  • Cost of the technology affects the return on investment and can significantly increase or reduce the break-even period
  • Climatic conditions: Cloud cover does affect the electricity produced by solar panels, but it doesn’t stop them from producing electricity. Cloud cover cannot stop ultra-violet rays from the sun and the solar panels work with ultra-violet rays to make electricity
  • Quality of cables and connectors: They should be high quality and connected properly. TUV and IP65 ratings are compulsory. Proper system maintenance is essential.
  • Improper sizing of panels & inverter: As a rule of thumb, 20-25% extra power should be added to the required power. This is due to the fact that the entire system incurs losses, called derate factor. Solar panels also tend to lose around approximately 1% of their efficiency per annum. Inverters are never 100% efficient and even at 95% efficiency, the differential in output needs to be catered for. So if you’re planning a 1.0kW system, you should purchase a 1.2kW PV system.
  • Other factors: Dust and smog film over the panels reduces output, so does battery over-discharging or using an improper charge controller. Always use an MPPT charge controller, sized properly. The roof should be strong and able to sustain the wind pressures affecting the solar panels.
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