LONGi · Afore
LONGi Hi-MO 7 LR7-72HGD-610M + Afore BNT010KTL: how many panels per string
From 4 to 18 LONGi Hi-MO 7 LR7-72HGD-610M panels per string on an MPPT input of the Afore BNT010KTL 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
- 4–18pcs
- Input V_max
- 1,100V
- MPPT window
- 150–1,000V
- Panel I_sc
- 14.65A
- MPPT input I_sc
- 25.0A
- Panel V_mp in heat
- 37.8V
Ground frame designer
A ground plant with LONGi Hi-MO 7 LR7-72HGD-610M
The builder opens with this panel and the Afore BNT010KTL 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 = 1.15 (α -0.23 %/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 (≤ 1,100) |
|---|---|---|---|---|---|
| Region I | -40 °C | 60.28 | 4 | 18 | 1,085.0 |
| Region II | -42 °C | 60.52 | 4 | 18 | 1,089.4 |
| Region IIIA | -38 °C | 60.04 | 4 | 18 | 1,080.7 |
| Region IIIB | -32 °C | 59.31 | 4 | 18 | 1,067.7 |
| Region IV | -20 °C | 57.87 | 4 | 19 | 1,099.5 |
| Region V | -27 °C | 58.71 | 4 | 18 | 1,056.8 |
The minimum per string keeps the string voltage in heat (panel V_mp 37.8 V) above the MPPT window (150 V).
Input currents
| Panel I_sc / MPPT input I_sc, A | 14.65 / 25.0 |
|---|---|
| Panel I_mp / MPPT input I_mp, A | 13.76 / 15.0 |
| 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 | 5.49 | 1 | 9 pan. × 1 — inv. 1, MPPT 1 | 0.55 |
| ≈ 10 kW | 17 | 10.37 | 1 | 17 pan. × 1 — inv. 1, MPPT 1 | 1.04 |
| ≈ 15 kW | 25 | 15.25 | 2 | 7 pan. × 1 — inv. 1, MPPT 1; 7 pan. × 1 — inv. 1, MPPT 2; 7 pan. × 1 — inv. 2, MPPT 1; 4 pan. × 1 — inv. 2, MPPT 2 | 0.76 |
- DC/AC 0.55 — inverter oversized
- U_OC MAX 1 029 В > 1000 В — звірте максимальну напругу системи панелей і апаратів (паспорт, 712.512.1.1)
- DC/AC 0.67 — inverter oversized
A preliminary calculation; a design needs an engineer's check. Solispec engine 0.12.0.