LONGi · Sofar
LONGi Hi-MO X10 LR7-54HVH-485M + Sofar 10KTLX-G3: how many panels per string
From 5 to 24 LONGi Hi-MO X10 LR7-54HVH-485M panels per string on an MPPT input of the Sofar 10KTLX-G3 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
- 5–24pcs
- Input V_max
- 1,100V
- MPPT window
- 140–1,000V
- Panel I_sc
- 15.23A
- MPPT input I_sc
- 22.5A
- Panel V_mp in heat
- 28.4V
Ground frame designer
A ground plant with LONGi Hi-MO X10 LR7-54HVH-485M
The builder opens with this panel and the Sofar 10KTLX-G3 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 = 1.13 (α -0.2 %/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 | 45.65 | 5 | 24 | 1,095.7 |
| Region II | -42 °C | 45.81 | 5 | 24 | 1,099.5 |
| Region IIIA | -38 °C | 45.49 | 5 | 24 | 1,091.8 |
| Region IIIB | -32 °C | 45.01 | 5 | 24 | 1,080.1 |
| Region IV | -20 °C | 44.04 | 5 | 24 | 1,056.9 |
| Region V | -27 °C | 44.60 | 5 | 24 | 1,070.4 |
The minimum per string keeps the string voltage in heat (panel V_mp 28.4 V) above the MPPT window (140 V).
Input currents
| Panel I_sc / MPPT input I_sc, A | 15.23 / 22.5 |
|---|---|
| Panel I_mp / MPPT input I_mp, A | 14.53 / 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 | 11 | 5.34 | 1 | 11 pan. × 1 — inv. 1, MPPT 1 | 0.53 |
| ≈ 10 kW | 21 | 10.19 | 1 | 21 pan. × 1 — inv. 1, MPPT 1 | 1.02 |
| ≈ 15 kW | 31 | 15.04 | 2 | 8 pan. × 1 — inv. 1, MPPT 1; 8 pan. × 1 — inv. 1, MPPT 2; 8 pan. × 1 — inv. 2, MPPT 1; 7 pan. × 1 — inv. 2, MPPT 2 | 0.75 |
- DC/AC 0.53 — inverter oversized
A preliminary calculation; a design needs an engineer's check. Solispec engine 0.12.0.