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2. Safety Precautions
2.1 Appropriate Usage
US series hybrid inverters are designed and tested in accordance with international safety requirements.
However, certain safety precautions must be taken when installing and operating this hybrid inverter. The
installer must read and follow all instructions, cautions and warnings in this installation manual.
- All operations including transport, installation, start-up and maintenance, must be carried out by
qualified, trained personnel.
- The electrical installation & maintenance of the hybrid inverter shall be conducted by a licensed
electrician and shall comply with local wiring rules and regulations.
- Before installation, check the unit to ensure it is free of any transport or handling damage, which
could affect insulation integrity or safety clearances. Choose the installation location carefully
and adhere to specified cooling requirements. Unauthorized removal of necessary protections,
improper use, incorrect installation and operation may lead to serious safety and shock hazards
or equipment damage.
- Before connecting the inverter to the power distribution grid, contact the local power distribution
grid company to get appropriate approvals. This connection must be made only by qualified
technical personnel.
- Do not install the equipment in adverse environmental conditions such as in close proximity to
flammable or explosive substances; in a corrosive or desert environment; where there is
exposure to extreme high or low temperatures; or where humidity is high.
- Do not use the equipment when the safety devices do not work or are disabled.
- Use personal protective equipment, including gloves and eye protection during the installation.
- Inform the manufacturer about non-standard installation conditions.
- Do not use the equipment if any operating anomalies are found. Avoid temporary repairs.
- All repairs should be carried out using only approved spare parts, which must be installed in
accordance with their intended use and by a licensed contractor or authorized FOXESS service
representative.
- Liabilities arising from commercial components are delegated to their respective manufacturers.
- Any time the hybrid inverter has been disconnected from the public network, please be
extremely cautious as some components can retain charge sufficient to create a shock hazard.
Prior to touching any part of the hybrid inverter please ensure surfaces and equipment are
under touch safe temperatures and voltage potentials before proceeding.
2.2 PE Connection and Leakage Current
PV System Residual Current Factors
- In every PV installation, several elements contribute to the current leakage to protective earth
(PE). These elements can be divided into two main types.
- Capacitive discharge current-Discharge current is generated mainly by the parasitic
capacitance of the PV modules to PE. The module type, the environmental conditions (rain,
humidity) and even the distance of the modules from the roof can effect the discharge current.
Other factors that may contribute to the parasitic capacitance are the inverter’s internal
capacitance to PE and external protection elements such as lighting protection.
- During operation, the DC bus is connected to the alternating current grid via the inverter. Thus, a
portion of the alternating voltage amplitude arrives at the DC bus. The fluctuating voltage
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