LONGi · Growatt
LONGi Hi-MO 6 LR5-54HTH-435M + Growatt SPF 5000 ES: how many panels per string
From 5 to 9 LONGi Hi-MO 6 LR5-54HTH-435M panels per string on an MPPT input of the Growatt SPF 5000 ES 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
- 5–9pcs
- Input V_max
- 450V
- MPPT window
- 120–430V
- Panel I_sc
- 14.22A
- MPPT input I_sc
- 22.0A
- Panel V_mp in heat
- 28.1V
Ground frame designer
A ground plant with LONGi Hi-MO 6 LR5-54HTH-435M
The builder opens with this panel and the Growatt SPF 5000 ES 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 (≤ 450) |
|---|---|---|---|---|---|
| Region I | -40 °C | 45.21 | 5 | 9 | 406.9 |
| Region II | -42 °C | 45.39 | 5 | 9 | 408.5 |
| Region IIIA | -38 °C | 45.03 | 5 | 9 | 405.3 |
| Region IIIB | -32 °C | 44.49 | 5 | 10 | 444.9 |
| Region IV | -20 °C | 43.40 | 5 | 10 | 434.0 |
| Region V | -27 °C | 44.03 | 5 | 10 | 440.3 |
The minimum per string keeps the string voltage in heat (panel V_mp 28.1 V) above the MPPT window (120 V).
Input currents
| Panel I_sc / MPPT input I_sc, A | 14.22 / 22.0 |
|---|---|
| Panel I_mp / MPPT input I_mp, A | 13.17 / 22.0 |
| Parallel strings per MPPT | 1 |
| MPPT inputs | 1 |
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 | 12 | 5.22 | 2 | 6 pan. × 1 — inv. 1, MPPT 1; 6 pan. × 1 — inv. 2, MPPT 1 | 0.52 |
| ≈ 10 kW | 23 | 10.01 | 3 | 8 pan. × 1 — inv. 1, MPPT 1; 8 pan. × 1 — inv. 2, MPPT 1; 7 pan. × 1 — inv. 3, MPPT 1 | 0.67 |
| ≈ 15 kW | 35 | 15.23 | 4 | 9 pan. × 1 — inv. 1, MPPT 1; 9 pan. × 1 — inv. 2, MPPT 1; 9 pan. × 1 — inv. 3, MPPT 1; 8 pan. × 1 — inv. 4, MPPT 1 | 0.76 |
- DC/AC 0.52 — inverter oversized
- DC/AC 0.70 — inverter oversized
- DC/AC 0.61 — inverter oversized
A preliminary calculation; a design needs an engineer's check. Solispec engine 0.12.0.