the above and below descriptions are taken from the OEM site – www.darfonsolar.com
Model Number: G640
When it comes to power and flexibility, Darfon has the microinverter you’ve been looking for. Darfon’s 3rd generation microinverter, the G640 can handle 60- or 72-cell modules and has an outstanding efficiency, THD and Power Factor. Even the cabling choice is up to you, whether it be a trunk cable or not. The G640 also features a high reliability design that continues working even if the electrolytic capacitors have problems over time. The Darfon G640 comes in four voltage options, so it can be installed in both residential and commercial applications.
Darfon’s advanced hybrid storage systems solve both problems in one integrated package with direct solar DC input in conjunction with AC charging capabilities. G640 Specifications Data Sheet