If the inverter has no AC output or the DC voltage drops, there is not enough power available. The battery is probably dead or damaged.
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These inverters are capable of 3P-480 VAC output, and can accommodate a very high DC to AC ratios, meaning that fewer inverter are needed to service a PV array.
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The inverter selected must match the power source, such as batteries or solar panels. Output Voltage states the AC voltage produced by the inverter, usually 120V or 230V, depending on the applicable.
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Yes, in the DC sense, AC has no polarity. The term is often used to refer to the line and grounded conductor (neutral), and yes, we know it's not technically correct.
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