Jinko · Growatt
Jinko Tiger Neo JKM640N-78HL4-BDV + Growatt MAX 50KTL3 LV: how many panels per string
From 5 to 16 Jinko Tiger Neo JKM640N-78HL4-BDV panels per string on an MPPT input of the Growatt MAX 50KTL3 LV 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
- 5–16pcs
- Input V_max
- 1,100V
- MPPT window
- 200–1,000V
- Panel I_sc
- 13.98A
- MPPT input I_sc
- 32.0A
- Panel V_mp in heat
- 40.9V
Ground frame designer
A ground plant with Jinko Tiger Neo JKM640N-78HL4-BDV
The builder opens with this panel and the Growatt MAX 50KTL3 LV 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 = 1.17 (α -0.25 %/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 | 66.66 | 5 | 16 | 1,066.5 |
| Region II | -42 °C | 66.94 | 5 | 16 | 1,071.1 |
| Region IIIA | -38 °C | 66.37 | 5 | 16 | 1,061.9 |
| Region IIIB | -32 °C | 65.51 | 5 | 16 | 1,048.2 |
| Region IV | -20 °C | 63.79 | 5 | 17 | 1,084.4 |
| Region V | -27 °C | 64.79 | 5 | 16 | 1,036.7 |
The minimum per string keeps the string voltage in heat (panel V_mp 40.9 V) above the MPPT window (200 V).
Input currents
| Panel I_sc / MPPT input I_sc, A | 13.98 / 32.0 |
|---|---|
| Panel I_mp / MPPT input I_mp, A | 13.33 / 26.0 |
| Parallel strings per MPPT | 1 |
| MPPT inputs | 6 |
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 | 8 | 5.12 | 1 | 8 pan. × 1 — inv. 1, MPPT 1 | 0.10 |
| ≈ 10 kW | 16 | 10.24 | 1 | 16 pan. × 1 — inv. 1, MPPT 1 | 0.20 |
| ≈ 15 kW | 24 | 15.36 | 1 | 12 pan. × 1 — inv. 1, MPPT 1; 12 pan. × 1 — inv. 1, MPPT 2 | 0.31 |
- DC/AC 0.10 — inverter oversized
- U_OC MAX 1 071 В > 1000 В — звірте максимальну напругу системи панелей і апаратів (паспорт, 712.512.1.1)
- DC/AC 0.20 — inverter oversized
- DC/AC 0.31 — inverter oversized
A preliminary calculation; a design needs an engineer's check. Solispec engine 0.12.0.