Important PV Solar Accessories You Need To Have In Your Solar Panel System

 

To a solar panel system belongs more than PV modules and solar power inverter. The solar power should be transported from the roof via solar power inverter in the utility grid. Therefore, it is important to choose the right cabling. Besides, there is a number of PV solar accessories, which we will discuss here.

Cabling

 

 

Very high requirements are placed on the cables, which connect the solar PV modules to each other, modules with solar power inverter and inverter with the grid connection point.

Particularly the cables between the solar PV panels and between the modules and inverter and because of their exposed position are subject to considerable weather conditions through sun, rain snow and, mechanical loads.

Therefore, here you cannot use any cables, but only appropriate solar cables. The cables, which connect the modules to each other, are pre-assembled.

Direct current cables

 

 

When choosing the direct current cables (cables between solar PV panels and solar power inverter) two factors play a decisive role, namely the length of DC cable and the right cable cross-section.

These two factors decide the resulting losses in the DC cables. Large cable  cross-section and short cables mean less losses. DC cables with large cross-section are more costly than with a smaller cross section.

There are also suitable tools for the calculation of the ideal cable cross-section.

Alternating current cables

 

 

When choosing the cables on the AC side, also from the solar power inverter to the feed-in point, make sure that the cable cross-section is large enough.

Moreover the AC cables should be as short as possible, because the losses occurring in the AC wiring are higher than in the DC wiring.

Solar data logger

 

 

Solar data logger is an electronic device, which records not only the data of the solar power inverter but also data of additional installed sensors (e.g.temperature and solar radiation sensor).

Besides, with the aid of suitable tools, solar data logger offers the possibility to present the stored data as diagrams in a comprehensible manner.

Solar data logger also offers the plant monitoring. Besides, some solar data loggers have the ability, in case of malfunctions to send an alarm message by SMS and can even remotely be regulated with PC, laptop or smartphone.

Lightning protection system

 

 

A lightning protection system is indispensable for the solar PV plant, on the one hand to protect the expensive investment, on the other hand when taking out of a photovoltaic cover insurance companies demand the proof of a lightning protection system.

The lightning protection concept should include two types of protecion:

• An external lightning protection, which prevents that a lightning strikes the solar PV system.
• An internal lightning protection ensures the potential equalisation with the aid of special photovoltaic arrestors in order to protect solar power inverters or solar cables.

PV Fireman’s switch

 

 

In the case of fire, the presence of solar PV system can lead to significant problems. Direct current always flows from the solar PV panels to solar power inverter, when radiation strikes the solar PV modules.

This can have dangerous consequences for firefighters. Therefore, the so-called PV fireman’s switch is required to disconnect centrally the whole solar panel system.