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Generators & Energy Meters
North American generators come in either 120/240V split phase or strictly 120V output configurations. A 120V renewable energy system with a prewired 120V generator will simplify installation as a 240V generator will with 240V systems.
How to Understand Generator Ratings
A "genset" refers to a backup generator that uses an internal combustion engine. It comprises a generator and a motor. It can come in various shapes, sizes and fuel-supply choices. Small ultra-portable gensets are unsuitable for home-emergency or battery-charging applications. In general, a light generator like this is too small for any home backup use.
How to Understand Generator Ratings Part 2
[If you haven't read Part 1 of this article, you should!]
Connecting Your PV System
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.
Connecting your PV System Part 2
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.
PV System AC Disconnects
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.