Class I power supplies have an earth-ground connection, whereas a Class II product does not. A Class I product must have two levels of protection between live (primary) parts and the end-user (secondary). If one level of protection fails, the end-user is still safe. [pdf]
[FAQS about Is the energy storage power supply Class I or Class II]
Some microinverters are easy to install, especially for DIYers. Installation is made even simpler because you can use standard AC wiring almost anywhere in the system. There are a number of battery backup options available for grid-tied systems. [pdf]
[FAQS about Is the photovoltaic inverter quick to install ]
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