PVWatts Calculator
NREL''s PVWatts ® Calculator Estimates the energy production of grid-connected photovoltaic (PV) energy systems throughout the world. It allows homeowners, small building owners,
However, this should always be within the recommended ratio. This is the reason why you may see a 'mismatch' between inverter size and solar panel capacity – for example, a 6.6kW system advertised with a 5kW inverter.
In some cases, it may make sense to pair a smaller inverter, say 2,400 watts, with that 3,000-watt solar array. When you pair an inverter that is underrated for the amount of power the system is designed to generate, that's called undersizing.
A lower capacity inverter will reach the optimal zone sooner and stay there longer, generating more power, even when 'clipping' occurs midday. Most Australian states also impose an export limit of 5kW for grid-connected solar, meaning that higher-capacity inverters may be 'export limited'.
According to the Clean Energy Council, you can have a solar array that can put out up to 30% more power than the inverter is rated for and remain within safe guidelines.
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