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By certification 
Smart-boost function
With the smart-boost function, the output of another source of alternating current, such as a power generator or a charger connection, can be increased; even when special loads are being used (inductive, asymmetric, with high switch-on current). It is also possible to combine the Fangpusun Xtender with almost all inverters which are already present in order to increase the available output.
Product features
· True sine wave voltage
· Excellent overload capabilities
· Optimal battery protection
· Adjustable integrated battery charger
· Multistage programmable battery charger with PFC
· Automatic load detection
· Standby load detection adjustable over a wide range, starting from a low value
· Parallel connectable
· Best reliability
· Can be used as a back-up system or uninterruptible power supply (UPS)
· Multifunction contact
· Adjustable power sharing
· Reliable and noiseless with any kind of load
· Support of sources of alternating current (Smart Boost)
· Automatic support for peak loads (Power Shaving)
· Ultra-fast transfer relay
· High efficiency
· Control by digital signal processor (DSP)
http://www.fangpusun-inverter.com/
