Yingli · Fronius
Yingli PANDA 3.0 Pro YL590CF72e/2 + Fronius Primo 8.2-1: how many panels per string
From 3 to 16 Yingli PANDA 3.0 Pro YL590CF72e/2 panels per string on an MPPT input of the Fronius Primo 8.2-1 inverter — in any climatic region of Ukraine. Below: the window for each region, the input currents and example plants laid out by the Solispec engine.
- Panels per string
- 3–16pcs
- Input V_max
- 1,000V
- MPPT window
- 80–800V
- Panel I_sc
- 14.06A
- MPPT input I_sc
- 36.0A
- Panel V_mp in heat
- 37.9V
Ground frame designer
A ground plant with Yingli PANDA 3.0 Pro YL590CF72e/2
The builder opens with this panel and the Fronius Primo 8.2-1 inverter: Solispec lays out the strings itself.
- No sign-up
- Snow and wind check
- Drawings and estimate
String by climatic region
T_min per ДСТУ-Н Б В.1.1-27:2010, табл. 1; open-circuit voltage at T_min: K_U = 1 + α·(T_min − 25)/100 = 1.16 (α -0.24 %/K, T_min -42 °C; Annex B).
| Region | T_min | Panel U_oc at T_min, V | Min per string | Max per string | String U_oc at max, V (≤ 1,000) |
|---|---|---|---|---|---|
| Region I | -40 °C | 61.24 | 3 | 16 | 979.9 |
| Region II | -42 °C | 61.50 | 3 | 16 | 984.0 |
| Region IIIA | -38 °C | 60.99 | 3 | 16 | 975.9 |
| Region IIIB | -32 °C | 60.23 | 3 | 16 | 963.6 |
| Region IV | -20 °C | 58.70 | 3 | 17 | 997.9 |
| Region V | -27 °C | 59.59 | 3 | 16 | 953.5 |
The minimum per string keeps the string voltage in heat (panel V_mp 37.9 V) above the MPPT window (80 V).
Input currents
| Panel I_sc / MPPT input I_sc, A | 14.06 / 36.0 |
|---|---|
| Panel I_mp / MPPT input I_mp, A | 13.27 / 18.0 |
| Parallel strings per MPPT | 1 |
| MPPT inputs | 2 |
No cautions about the currents.
Example plants
The Solispec engine laid out the strings for plants of several sizes with this inverter at the lowest T_min; only those that pass the checks with every panel placed are shown.
| Plant | Panels | kW DC | Inverters | Strings | DC/AC |
|---|---|---|---|---|---|
| ≈ 5 kW | 9 | 5.31 | 1 | 9 pan. × 1 — inv. 1, MPPT 1 | 0.65 |
| ≈ 10 kW | 17 | 10.03 | 1 | 9 pan. × 1 — inv. 1, MPPT 1; 8 pan. × 1 — inv. 1, MPPT 2 | 1.22 |
| ≈ 15 kW | 26 | 15.34 | 2 | 13 pan. × 1 — inv. 1, MPPT 1; 13 pan. × 1 — inv. 2, MPPT 1 | 0.94 |
- DC/AC 0.65 — inverter oversized
A preliminary calculation; a design needs an engineer's check. Solispec engine 0.12.0.