PANEL HANDBOOK aH72 SK
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Note: A string is a number of photovoltaic panels (the glazed portion of the hybrid panels) connected
in series (modules interconnected so that the positive in one module is connected to the negative in
the next, and so on).
The positive and negative ends of each string or set of them must be connected to the inverter.
The DC cables must be securely fastened to the panel structure.
The DC cables must be visible and securely fastened to the connection point with the inverter or the
DC circuit breaker.
Follow the manufacturer's requirements for installing the inverter and the electrical installation
regulations for the protection of the DC and AC parts of the installation.
Note: Follow wiring diagrams and schemes designed specifically for connection to existing power
service.
Once the system is fully connected and installed, it is important to check the installation to ensure that
all terminals are tight.
5.2.7
Electrical grounding, equipotential bonding and lightning protection
Lightning protection
Where buildings or structures are considered to be at greater risk, for example when they are very tall,
or in an exposed location, the designer of the electrical system must provide the necessary protective
measures. In any case, protection against overvoltage must be provided on both the AC and DC parts.
For an isolated installation without lightning conductors, the risk is on induction of lightning close to
or between clouds, in which case Type 2 protectors would be appropriate, for both AC and DC side.
For example, if you have 1000Vdc and 400V 3PH+N on the AC output, a proposal of equipment would
be:
Type 1, or better, Type1+2, will be used when there are lightning conductors in the installation. Type
1+2 can also be used on the AC side, on the safety side, when there is an air connection.
Protective equipotential bonding (electrical grounding)
The protective equipotential bonding is a measure that applies to parts of the electrical installation
that, under fault conditions, may have a different potential to earth. When applying this measure, the
risk of electric shock is limited since there must be little or no difference in the voltages between the
parts (potential difference), which could otherwise be activated.
Joining must be carried out in accordance with local regulations.