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SafetyAspects.md

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Some thoughts about security

  • The solar panels are protected against lightning strikes by an overvoltage protection.
  • The parallel connected solar panels are protected by a blocking diode so that the current does not flow into the other series connection.
  • Directly after the solar panels a circuit breaker is installed in the garage so that the solar voltage can be disconnected from the grid on site.
  • The solar connection line in the basement also has a circuit breaker so that the solar voltage can also be disconnected in the basement.
  • The solar charge controller has reverse polarity protection, overload protection and temperature protection and also switches off automatically in case of other errors.
  • The battery monitor monitors the battery voltage, charge and discharge current, as well as the midpoint voltage and temperature of the battery bank.
  • The inverter has overvoltage protection, undervoltage protection and temperature monitoring.
  • The batteries have an integrated battery management system. This protects each battery from overvoltage, undervoltage, overtemperature and undertemperature below 0 degrees Celsius.
  • In addition, the battery management system also protects against short circuit.
  • The battery bank can be disconnected from the system by a power disconnect switch.
  • The battery bank connection is protected by a 100A fuse from the system.
  • The power switching relay circuit and the supply voltage of the battery monitoring system is protected against short circuit by a 1A fuse.
  • The output of the inverter is protected against fault currents by a RCD fuse.
  • The output of the inverter can be remotely disconnected from the grid via a power monitoring system via Wifi.
  • According to the installation connection standard and so that the RCD is functional, one phase of the inverter is defined by means of grounding to a defined potential.
  • The complete system sends its status data to a home control system (IoBroker).
  • An E-Ink display shows all important system data and statistics.
  • The circuit is fireproof mounted on a Fermacell panel.
  • The connections with higher voltage are covered finger-safe.
  • A fire alarm is mounted in the basement room.
  • Furthermore, a special extinguisher for lithium-ion batteries is mounted in some distance.

I hope I have not overlooked anything fundamentally important.