Some hybrid and off-grid battery inverters also have input to connect a generator. You can stack multiple hybrid inverters for higher output. The output Amps are based on the inverter capability, generally 25A to 33A continuous power, with burst capability. These hybrid inverters have an integrated transfer switch and connection for a "critical load" sub-panel. DC power flows from the panels and directly into the battery, where the DC power is stored. There are also hybrid inverters that connect the solar and the battery in the same unit this is called DC-coupled. Power from panels is DC, the power to the solar inverter is AC, the power to the battery inverter is AC/DC, and then power to the battery is DC. You can have two inverters, one for grid-tied solar and one for an off-grid battery this is called AC-coupled. To have whole-house power, you need multiple battery inverters stacked together. Each inverter has an AC output Amp rating for off-grid use, generally 25A to 33A continuous power, with burst capability. Whole house power (e.g., 50 Amps or more) may require multiple inverters. Partial house power is also called essential load or critical load power in that you power the basics like a fridge, lights, outlets, wifi router, and small 120Vac appliances. Partial House = more economical (one hybrid inverter, smaller battery).
Whole House = more expensive (multiple inverters, larger battery).To keep it simple, the tradeoff is cost vs. Either can be wired in various ways depending on the inverter(s). When considering solar power with a battery storage backup system, you will have to decide if you want Whole House Power, rather than Partial House Power, during an outage.
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