LONGi · Growatt
LONGi Hi-MO X10 LR7-72HVH-650M + Growatt MOD 10KTL3-XH: how many panels per string
From 4 to 17 LONGi Hi-MO X10 LR7-72HVH-650M panels per string on an MPPT input of the Growatt MOD 10KTL3-XH 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
- 4–17pcs
- Input V_max
- 1,100V
- MPPT window
- 140–1,000V
- Panel I_sc
- 15.29A
- MPPT input I_sc
- 20.0A
- Panel V_mp in heat
- 37.9V
Ground frame designer
A ground plant with LONGi Hi-MO X10 LR7-72HVH-650M
The builder opens with this panel and the Growatt MOD 10KTL3-XH 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 | 60.91 | 4 | 18 | 1,096.3 |
| Region II | -42 °C | 61.12 | 4 | 17 | 1,039.1 |
| Region IIIA | -38 °C | 60.69 | 4 | 18 | 1,092.5 |
| Region IIIB | -32 °C | 60.04 | 4 | 18 | 1,080.8 |
| Region IV | -20 °C | 58.75 | 4 | 18 | 1,057.5 |
| Region V | -27 °C | 59.51 | 4 | 18 | 1,071.1 |
The minimum per string keeps the string voltage in heat (panel V_mp 37.9 V) above the MPPT window (140 V).
Input currents
| Panel I_sc / MPPT input I_sc, A | 15.29 / 20.0 |
|---|---|
| Panel I_mp / MPPT input I_mp, A | 14.59 / 16.0 |
| 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 | 8 | 5.20 | 1 | 8 pan. × 1 — inv. 1, MPPT 1 | 0.52 |
| ≈ 10 kW | 16 | 10.40 | 1 | 16 pan. × 1 — inv. 1, MPPT 1 | 1.04 |
| ≈ 15 kW | 24 | 15.60 | 2 | 12 pan. × 1 — inv. 1, MPPT 1; 12 pan. × 1 — inv. 2, MPPT 1 | 0.78 |
- DC/AC 0.52 — inverter oversized
A preliminary calculation; a design needs an engineer's check. Solispec engine 0.12.0.