JA Solar · Huawei
JA Solar JAM54S30-410/MR + Huawei SUN2000-20KTL-M2: how many panels per string
From 6 to 24 JA Solar JAM54S30-410/MR panels per string on an MPPT input of the Huawei SUN2000-20KTL-M2 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
- 6–24pcs
- Input V_max
- 1,080V
- MPPT window
- 160–950V
- Panel I_sc
- 13.95A
- MPPT input I_sc
- 30.0A
- Panel V_mp in heat
- 26.8V
Ground frame designer
A ground plant with JA Solar JAM54S30-410/MR
The builder opens with this panel and the Huawei SUN2000-20KTL-M2 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 = 1.18 (α -0.275 %/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 (≤ 1,080) |
|---|---|---|---|---|---|
| Region I | -40 °C | 43.99 | 6 | 24 | 1,055.8 |
| Region II | -42 °C | 44.20 | 6 | 24 | 1,060.7 |
| Region IIIA | -38 °C | 43.79 | 6 | 24 | 1,050.9 |
| Region IIIB | -32 °C | 43.17 | 6 | 25 | 1,079.3 |
| Region IV | -20 °C | 41.94 | 6 | 25 | 1,048.5 |
| Region V | -27 °C | 42.66 | 6 | 25 | 1,066.4 |
The minimum per string keeps the string voltage in heat (panel V_mp 26.8 V) above the MPPT window (160 V).
Input currents
| Panel I_sc / MPPT input I_sc, A | 13.95 / 30.0 |
|---|---|
| Panel I_mp / MPPT input I_mp, A | 13.04 / 22.0 |
| 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 | 13 | 5.33 | 1 | 13 pan. × 1 — inv. 1, MPPT 1 | 0.27 |
| ≈ 10 kW | 25 | 10.25 | 1 | 13 pan. × 1 — inv. 1, MPPT 1; 12 pan. × 1 — inv. 1, MPPT 2 | 0.51 |
| ≈ 15 kW | 37 | 15.17 | 1 | 19 pan. × 1 — inv. 1, MPPT 1; 18 pan. × 1 — inv. 1, MPPT 2 | 0.76 |
- DC/AC 0.27 — inverter oversized
- DC/AC 0.51 — inverter oversized
A preliminary calculation; a design needs an engineer's check. Solispec engine 0.12.0.