What does the perfect PV system look like?Ilumen
A PV system is made up of several components. Of each component various types exist, which for certain properties are very different from each other. This obviously has implications in terms of quality.
In this article we introduce you the ‘perfect’ PV system.
Preferably choose monocrystalline solar panels. In comparison with other types of panels, they offer the following advantages:
- The highest yield per m²
- The best quality of silicium
- Less chance on ‘micro cracks’
- A proven lifetime
Furthermore, make sure that sufficient bypass diodes are provided (3 diodes is better than 6).
In order to minimize efficiency losses, the voltage drop across the cable ideally equals 0.5%.
Regarding the dimensions of the cables, next ‘golden’ rule of thumb applies
- Length of cable ≤ 10 meter: section 4 mm²
- Length of cable > 10 meter: section 6 mm²
The best installers only use wires with a section of 6 mm².
Ensure that al your cables are in a cable duct. In this way martens have no chance. Fix all connectors properly and opt for a degree of protection against water of at least IP67.
When choosing an inverter, always consider efficiency as a crucial factor. Inverters without transformer offer a higher efficiency than their counterparts with transformer. We recommend you to choose an inverter without transformer with at least an efficiency of 97%.
You best opt for multiple MPPT’s (Maximum Power Point Tracking).
An inverter without transformer has a 100% chance on PID. In the perfect solar panel installation, the integration of a PIDbox is therefore a must.
5) Mounting of solar panels
Ensure that your solar panels and inverter are properly dimensioned. The dimensioning is dependent on:
- The orientation of your roof
- The presence of shadow
- Shadow on solar panels must in any case be avoided. If this is impossible, a separate MPPT from an inverter is to be connected via a loop or string. If unsuccesful, your installation will not generate the yield required.
Never drill a hole through your roof during the installation process, especially on flat roofs!
On a sloping roof, the solar panels bust be mounted on the rafter and NEVER on the battens. If you have a slate roof, you need to rely on a specialist.
For a flat roof it is necessary to carry out a wind calculation as well as a stability control (snow and rain).
Finally, make sure that for security reasons, your solar panels are properly grounded. Since non grounding results in degradation of the solar panels, you must provide a PIDbox.
The green power meter is installated between the inverter and the AC grid. Make sure this meter can be remotely ‘logged’ so malfunction and failure can be detected.