There are two basic approaches to connecting a grid-tied solar panel system, as shown in the wiring diagrams below. The most common is a "LOAD SIDE" connection, made AFTER the main breaker.
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Compare supply-side vs load-side solar interconnections. Understand the 120% rule, NEC requirements, and how to choose the right method for your project.
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Optimize DC AC Ratio and Inverter Loading to curb clipping and calculate inverter load ratio with climate-smart sizing.
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Choosing between a supply-side (line-side) or load-side (breaker-based) connection impacts not only your system cost and complexity, but also code compliance and inspection
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Export occurs when the power generated by the solar system is greater than the power used by the loads on site. The utility will only permit the photovoltaic system to interact with the power grid after
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Let''s start out with the first basic requirement in 705.12 (D) (2): 125% of the inverter output circuit current must be used for the ampacity calculations for most of the interconnection
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Example on that last point of being able to put the breaker anywhere you want, with this PV breaker located actually at the top of the busbar: In this case, 160 amps x 125 = is 200 amps.
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For those using load-side breaker in a bus bar for the point of interconnection, the 120% rule states that the main service breaker rating plus 125% of the max continuous AC inverter output
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NEC 690.64 permits the output of the inverter to be connected to either load side (customer side) or supply side (utility side) service points, depending on the size of the PV system and marginal power
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A deep dive into NEC 705.12, explaining the rules for determining a code-compliant point of connection (POC) for a PV system on the load side of the service.
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Optimize DC AC Ratio and Inverter Loading to curb clipping and calculate inverter load ratio with climate-smart sizing.
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