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In PVsyst, the back-up generator is only considered as an alternator+rectifier element  (Genset), ensuring the recharging of batteries when the solar energy is insufficient to satisfy the user's needs.

You can specify a Nominal power, as well as an Operating power, for which the efficiency may be lower.

Its parameters are no more than the definition of the nominal power supplied, as well as a specific fuel-consumption (in volume per hour) to evaluate the back-up consumption.

Provision is made for defining commercial available devices (sizes, weight, etc), but no one is proposed in the database.