How to Understand Generator Ratings Part 2
[If you haven't read Part 1 of this article, you should!]
[If you haven't read Part 1 of this article, you should!]
WARNING!
Local electrical inspectors and many electrical contractors in North America are still unfamiliar with off-grid systems: it is wise to consult an expert before committing to a system.
Besides the NEC/CEC rules, every electrical appliance requires a Part 2 product standard certification if it operates at either 120V or 240V (AC). If safety is a consideration, this requirement also applies to appliances of lower voltage, such as battery power tools.
Two necessities for safety (and to comply with local and national electrical codes) are to have excess current protection and a means of disconnection on all voltage sources in any ungrounded conductor. This includes all connections between the PV array, batteries, wind turbine and inverter. Almost all AC sources have some form of protection and means of disconnection in any home or appliance wiring. Even the inverter and generator have their own circuit breaker or certified fuse device.
NEC rules state that battery cables cannot be of arc welding wire or other unapproved types: only standard building-grade wires may be installed. CEC allows for all types to be used.
Please check our NEEC Section for further reference.