# Site Design Rules

##### When you consider investing solar PV farm in your potential area, you need to fully maximize your designated area to get faster ROI by determining on how many solar modules/panels, how many and which type of power optimizers and inverters you need to buy, how many panels per string you need to set up and how many strings in one inverter. This solution will provide you on how you tailor your own solar farm.

### In general:

- Every 7m2 of your desired area, you can install 1 kW of solar panel
- The dimension of panel is 1 m x 1.8 m (width x length)
- Specification on each panel on average are 32V, 9.2 A, 295 W in 60 cells
- Different inverters have different optimum range of DC input voltage
- One power optimizer (P600) can hold 2 modules/panels

#### Procedures/steps to design your favorable solar farm:

##### 1. Selecting the most compatible power optimizer and inverter with modules for your solar PV system

P300 | P350 | P500 | P404 | P405 | P600 | P700 | |
---|---|---|---|---|---|---|---|

Compatible with module type |
60-cell | 60/72-cell | 96-cell | 60/72-cell | Thin-film | 2x 60-cell | 2x 72-cell |

Rated Input Power (@STC) |
300W | 350W | 500W | 405W | 405W | 600W | 700W |

Absolute Maximum Input Voltage (Voc at lowest temperature) |
48V | 60V | 80V | 80V | 125V | 96V | 125V |

MPPT Operating Range |
8-48V | 8-60V | 8-80V | 12.5-80V | 12.5-105V | 12.5-80V | 12.5-105V |

Maximum Input Current (ISC) |
10A | 11A | 10.1A | 10.1A | 10.1A | 10.1A | 10.1A |

Maximum Output Voltage |
60V | 60V | 60V | 85V | 85V | 85V | 85V |

Maximum Output Current |
15A | 15A | 15A | 15A | 15A | 15A | 15A |

#### Inverter

SE15k | SE16k | SE17k | SE25k | SE27.6k | SE33.3k | ||
---|---|---|---|---|---|---|---|

OUTPUT |
|||||||

Rated AC Power Output |
15000 | 16000 | 17000 | 25000 | 27600 | 33300 | VA |

Maximum AC Power Output |
15000 | 16000 | 17000 | 25000 | 27600 | 33300* | VA |

AC Output Voltage - Line to Line / Line to Neutral (Nominal) |
380 / 220 ; 400 / 230 | 480/277 | VAC | ||||

AC Output Voltage - Line to Neutral Range |
184 - 264.5 | 244-305 | VAC | ||||

AC Frequency |
50/60 Â± 5 | Hz | |||||

Maximum Continuous Output Current (per Phase) |
23 | 25.5 | 26 | 38 | 40 | 40 | A |

Residual Current Detector / Residual Current Step Detector |
300 / 30 | mA | |||||

Grids Supported - Three Phase |
3 / N / PE ; 230 / 400 |
3 / N / PE (WYE with Neutral) |
V | ||||

Utility Monitoring, Islanding Protection, Configurable Power Factor, Country Configurable Thresholds |
Yes | ||||||

INPUT |
|||||||

Recommended Max. DC Power(1) (Module STC) |
18750 | 20000 | 21250 | 33750 | 37250 | 44950 | W |

Transformer-less, Ungrounded |
Yes | ||||||

Maximum Input Voltage (Voc) |
900 | 1000 | VDC | ||||

Nominal DC Input Voltage |
750 | 840 | VDC | ||||

Recommended Max. DC Power(1) (Module STC) |
22 | 23 | 23 | 37 | 40 | 40 | ADC |

Reverse-Polarity Protection |
Yes | ||||||

Ground-Fault Isolation Detection |
1MÎ© Sensitivity | ||||||

Maximum Inverter Efficiency |
98 | 98.5 | % | ||||

European Weighted Efficiency |
97.6 | 97.7 | 97.7 | 98 | 98 | 98.3 | % |

Nighttime Power Consumption |
< 2.5 | < 4 | W | ||||

ADDITIONAL FEATURES |
|||||||

Supported Communication InterfacesSTC) |
RS485, RS232, Ethernet, Zigbee (optional) |
RS485, Ethernet, Zigbee (optional), Wi-Fi (optional) |
|||||

STANDARD COMPLIANCE |
|||||||

Safety |
IEC-62103 (EN50178), IEC-62109 |
IEC-62103 (EN50178), IEC-62109, AS3100 |
|||||

Grid Connection Standards |
VDE 0126-1-1, VDE-AR-N-4105, AS-4777, RD-1663, DK 5940 |
VDE-AR-N-4105, BDEW, G59/3, AS-4777, EN 50438, VDE 0126-1-1, CEI-021, CEI-016(2) | BDEW, CEI-016 |
||||

Emissions |
IEC61000-6-2, IEC61000-6-3 , IEC61000-3-11, IEC61000-3-12, FCC part15 class B |
EC61000-6-2, IEC61000-6-3, IEC61000-3-11, IEC61000-3-12 |
|||||

Emissions |
Yes | ||||||

INSTALLATION SPECIFICATIONS |
|||||||

AC Output |
Cable Gland - diameter 15-21 | mm | |||||

DC Input |
2 MC4 pairs | 3 MC4 pairs | mm | ||||

Dimensions (H x W x D) |
540 x 315 x 260 | mm | |||||

Weight |
33.2 | 45 | kg | ||||

Operating Temperature Range |
-20 - +60 (M40 version -40 - +60) |
-20 - +60 (-40 version available) | ËC | ||||

Cooling |
Fans (user replaceable) | ||||||

Noise |
<55 | ||||||

Protection Rating |
IP65 - Outdoor and Indoor | ||||||

Bracket Mounted (Bracket Provided) |

(1) Limited to 135% of AC power.

(2) For all standards refer to Certifications category in Downloads page

* 33.3k requires separate 480V-MV transformer

##### 2. Keep in mind that each string has to follow one of these rules (only optimizers from the same row can be mixed within one string):

##### 3. Understanding your oversizing condition based on the location you are at (Oversizing is only allowed for inverter with the maximum oversizing up to 135%, but oversizing for power optimizer as well as string are NOT ALLOWED)

###### A. Example of power optimizer oversizing:

From this picture, we can see that P600 has to be set into series and NOT parallel. It is due to the maximum current (ampere) that exceed its limitation.

*Remark: if it is series, the current (ampere) is the same; if it is parallel, the voltage (volt) is the same

#### B. Example of string oversizing:

#### C. Oversizing exceptions:

- Inverter over-sizing is up to 135% (37.25 kWp DC)
- Maximum string power: 11.25 kW

#### D. String over-sizing of up to 13.5 kW per string allowed, if:

- P600 or P700 are used
- And 3 strings are connected to the inverter
- And maximum power difference between strings: 2000W and maximum panel difference between strings: 6 panels

#### Case Example 1:

##### Oversizing (%) in Taiwan

Oversizing | ||
---|---|---|

Region | Perfect angle | Non-perfect angle |

North/East | 110-115% | 120% |

South | 105-110% | 110-115% |

##### If the condition is 20 kW of inverter with 2 MPPTs and your optimum range of inverter is 550V-800V

- Oversize the 20 kW inverter based on the location you are at
- Since there are 2 MPPTs, there are 4 strings of panels. Each string has 10 kW (20 kW/2)
- Calculate the number of panels you need for each string
- 10000 w / 295 = 33.8 panels = 34 panels
- Each string needs 34/2 = 17 panels

- We need to install more panels to reach the minimum voltage of operating inverter. This phenomenon is called oversizing.
- Take as an example that the oversizing is 118%. Therefore, the oversized inverter is 20 kW*1.18 = 23.6 kW
- Each MPPT has 23.6 kW/2 = 11.8 kW
- To know the how many panels we need is by calculating 11.8/0.295 kW = 40 panels, so each MPPT needs 40 panels and each string needs 20 panels.
- The optimum range of MPPT is 550-800 V, so if we calculate 40 panels x 32 V (each module) = 640 V in each string
- In conclusion, we need 40 panels for each MPPT in this condition.

#### Case Example 2:

##### Take as an example of 50 kW inverter with 1 MPPT, oversizing 110%, how many panels do we need?

- Calculate the number of panels you need for each string
- =50 kW*1.1 = 55 kW
- =55 kW/0.295 = 186 panels

- Since the maximum of voltage of inverter is 550-800 V. Thus, maximum panel in each string is ranged from 17-25. It is suggested to have 19-23 panels on each string in this condition
- Take an example 23 panels per string, so 186 kW / 23 = 8 strings

#### Case Example 3

##### You have certain potential rooftop areas that you have decided to invest for solar PV system. You have 382.32 kW that can be generated from your rooftop. There are several inverters of SolarEdge provided (three-phase) : 33.3 kW, 27.6 kW, 25 kW, 17 kW, 16 kW, 15 kW, 12.5 kW, 10 kW, 9 kW, 8 kW, 7 kW, 5 kW, 4 kW. Oversize is 110-115% How many and which inverters are recommended for you to buy?

- Ideally, the higher power of inverter, the cheaper price will be per watt.
- 33.3 kW is considered as the cheapest inverter per kWh (the higher AC power output, the cheaper inverter per kWh). It is different from other inverters.
- Oversizing your inverter depending on the location you are at.
- Let's say we are in the Southern part of Taiwan and we want to apply the cheapest price per kW: 33.3 kW
- 382.32 kW of potential ground or rooftop you want to install solar farm
- Calculate the number of panels you need for each string
- = 382.32/ (33.3 x 1.1)
- = 382.32/36.63
- = 10.44 = 10 inverters of 33.3 kW