Trina · Growatt
Trina Vertex S+ TSM-500NEG18R.28 + Growatt MOD 10KTL3-XH: how many panels per string
From 5 to 23 Trina Vertex S+ TSM-500NEG18R.28 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
- 5–23pcs
- Input V_max
- 1,100V
- MPPT window
- 140–1,000V
- Panel I_sc
- 15.86A
- MPPT input I_sc
- 20.0A
- Panel V_mp in heat
- 28.4V
Ground frame designer
A ground plant with Trina Vertex S+ TSM-500NEG18R.28
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 = 1.16 (α -0.24 %/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 | 46.36 | 5 | 23 | 1,066.2 |
| Region II | -42 °C | 46.55 | 5 | 23 | 1,070.6 |
| Region IIIA | -38 °C | 46.16 | 5 | 23 | 1,061.8 |
| Region IIIB | -32 °C | 45.59 | 5 | 24 | 1,094.1 |
| Region IV | -20 °C | 44.43 | 5 | 24 | 1,066.3 |
| Region V | -27 °C | 45.10 | 5 | 24 | 1,082.5 |
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 | 15.86 / 20.0 |
|---|---|
| Panel I_mp / MPPT input I_mp, A | 15.03 / 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 | 10 | 5.00 | 1 | 10 pan. × 1 — inv. 1, MPPT 1 | 0.50 |
| ≈ 10 kW | 20 | 10.00 | 1 | 20 pan. × 1 — inv. 1, MPPT 1 | 1.00 |
| ≈ 15 kW | 30 | 15.00 | 2 | 15 pan. × 1 — inv. 1, MPPT 1; 15 pan. × 1 — inv. 2, MPPT 1 | 0.75 |
- DC/AC 0.50 — inverter oversized
A preliminary calculation; a design needs an engineer's check. Solispec engine 0.12.0.