Astronergy · Solis
Astronergy ASTRO N7 Pro CHSM66RN(DG)/F-BQ-660 + Solis S6-GR1P3K: how many panels per string
From 2 to 9 Astronergy ASTRO N7 Pro CHSM66RN(DG)/F-BQ-660 panels per string on an MPPT input of the Solis S6-GR1P3K 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
- 2–9pcs
- Input V_max
- 550V
- MPPT window
- 50–450V
- Panel I_sc
- 16.72A
- MPPT input I_sc
- 22.0A
- Panel V_mp in heat
- 35.3V
Ground frame designer
A ground plant with Astronergy ASTRO N7 Pro CHSM66RN(DG)/F-BQ-660
The builder opens with this panel and the Solis S6-GR1P3K 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 (≤ 550) |
|---|---|---|---|---|---|
| Region I | -40 °C | 56.65 | 2 | 9 | 509.8 |
| Region II | -42 °C | 56.87 | 2 | 9 | 511.9 |
| Region IIIA | -38 °C | 56.42 | 2 | 9 | 507.8 |
| Region IIIB | -32 °C | 55.74 | 2 | 9 | 501.7 |
| Region IV | -20 °C | 54.38 | 2 | 10 | 543.8 |
| Region V | -27 °C | 55.17 | 2 | 9 | 496.6 |
The minimum per string keeps the string voltage in heat (panel V_mp 35.3 V) above the MPPT window (50 V).
Input currents
| Panel I_sc / MPPT input I_sc, A | 16.72 / 22.0 |
|---|---|
| Panel I_mp / MPPT input I_mp, A | 15.94 / 14.0 |
| Parallel strings per MPPT | 1 |
| MPPT inputs | 2 |
- Power clippingThe panel's working current (15.94 A) is above the input's working current (14.0 A): on clear days the inverter clips part of the power.
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 | 10 | 6.60 | 2 | 5 pan. × 1 — inv. 1, MPPT 1; 5 pan. × 1 — inv. 2, MPPT 1 | 1.10 |
| ≈ 10 kW | 17 | 11.22 | 3 | 3 pan. × 1 — inv. 1, MPPT 1; 3 pan. × 1 — inv. 1, MPPT 2; 3 pan. × 1 — inv. 2, MPPT 1; 3 pan. × 1 — inv. 2, MPPT 2; 3 pan. × 1 — inv. 3, MPPT 1; 2 pan. × 1 — inv. 3, MPPT 2 | 1.25 |
| ≈ 15 kW | 23 | 15.18 | 5 | 3 pan. × 1 — inv. 1, MPPT 1; 3 pan. × 1 — inv. 1, MPPT 2; 3 pan. × 1 — inv. 2, MPPT 1; 3 pan. × 1 — inv. 2, MPPT 2; 3 pan. × 1 — inv. 3, MPPT 1; 2 pan. × 1 — inv. 3, MPPT 2; 3 pan. × 1 — inv. 4, MPPT 1; 3 pan. × 1 — inv. 5, MPPT 1 | 1.01 |
- current 15.9 A > 14 A — the inverter will clip (clipping)
- DC/AC 1.32 — will clip peaks
- DC/AC 0.66 — inverter oversized
A preliminary calculation; a design needs an engineer's check. Solispec engine 0.12.0.