Photovoltaic system: electrical equipments selection: Difference between revisions
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== Grid connected PV system ≤ 10kW (Residential) == | |||
== | === One single phase inverter === | ||
* Typically, a 5kW grid-connected single-phase inverter. with UOC MAX ≤ 600V. One or two strings – Isctc < 25A, IAC < 32A. In this design there is no string protection. | |||
* A PV main switch is necessary. When the inverter is indoors, an additional remote controlled switch at the DC cable entry point is recommended for emergencies services. | |||
{{FigImage|DB422723_EN|svg|P22|Grid connected <{{=}} 10kW}} | |||
== 10 to 100kW grid connected PV system (Small building) == | |||
=== One three phase inverter with one string combiner box === | |||
* Typically, 30kW to 60kW grid-connected inverters. U<sub>OC max</sub> is generally higher than 600V (up to 1000V), Isctc does not exceed 200A, Iac does not exceed 100A. | |||
* This design has more than 2 strings. | |||
* Reverse current protection is therefore necessary. | |||
* A main PV switch is required. When an inverter is inside, additional remote-controlled switch at DC cable entry point is recommended for emergencies. | |||
=== | {{FigImage|DB422725_EN|svg|P23|10-100kW single MPPT inverter}} | ||
=== Multi single phase inverters design === | |||
* Typically, 6x5 to 20x5kW grid-connected inverters. | |||
* The design used for residential building can be duplicated as often as necessary. | |||
* In that case, the DC system is very simple and the AC system is very similar to usual AC systems. | |||
{{FigImage|DB422726_EN|svg|P24|10-100kW multi single MPPT inverter}} | |||
== 150kW to 500kW Grid connected PV system (Large building and farm) == | |||
=== Three phase inverter with more than two string combiner boxes === | |||
* Typically, 150kW to 500kW single inverter. | |||
* This design is very similar to the three phase inverter with one string combiner box except that it has more arrays, which requires array cable protection. | |||
* Istc <= 400A, IAC <= 600A. | |||
{{FigImage|DB422728_EN|svg|P25|150-500kW single MPPT inverter with N arrays > 2}} | |||
Latest revision as of 17:52, 20 December 2019
Grid connected PV system ≤ 10kW (Residential)
One single phase inverter
- Typically, a 5kW grid-connected single-phase inverter. with UOC MAX ≤ 600V. One or two strings – Isctc < 25A, IAC < 32A. In this design there is no string protection.
- A PV main switch is necessary. When the inverter is indoors, an additional remote controlled switch at the DC cable entry point is recommended for emergencies services.
Fig. P22 – Grid connected <= 10kW
10 to 100kW grid connected PV system (Small building)
One three phase inverter with one string combiner box
- Typically, 30kW to 60kW grid-connected inverters. UOC max is generally higher than 600V (up to 1000V), Isctc does not exceed 200A, Iac does not exceed 100A.
- This design has more than 2 strings.
- Reverse current protection is therefore necessary.
- A main PV switch is required. When an inverter is inside, additional remote-controlled switch at DC cable entry point is recommended for emergencies.
Fig. P23 – 10-100kW single MPPT inverter
Multi single phase inverters design
- Typically, 6x5 to 20x5kW grid-connected inverters.
- The design used for residential building can be duplicated as often as necessary.
- In that case, the DC system is very simple and the AC system is very similar to usual AC systems.
Fig. P24 – 10-100kW multi single MPPT inverter
150kW to 500kW Grid connected PV system (Large building and farm)
Three phase inverter with more than two string combiner boxes
- Typically, 150kW to 500kW single inverter.
- This design is very similar to the three phase inverter with one string combiner box except that it has more arrays, which requires array cable protection.
- Istc <= 400A, IAC <= 600A.
Fig. P25 – 150-500kW single MPPT inverter with N arrays > 2
