JA Solar · FoxESS
JA Solar JAM54S30-430/LR + FoxESS H3-10.0-Smart: how many panels per string
From 5 to 22 JA Solar JAM54S30-430/LR panels per string on an MPPT input of the FoxESS H3-10.0-Smart 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
- 5–22pcs
- Input V_max
- 1,000V
- MPPT window
- 120–950V
- Panel I_sc
- 14.42A
- MPPT input I_sc
- 25.0A
- Panel V_mp in heat
- 26.8V
Ground frame designer
A ground plant with JA Solar JAM54S30-430/LR
The builder opens with this panel and the FoxESS H3-10.0-Smart 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 (≤ 1,000) |
|---|---|---|---|---|---|
| Region I | -40 °C | 44.26 | 5 | 22 | 973.8 |
| Region II | -42 °C | 44.47 | 5 | 22 | 978.3 |
| Region IIIA | -38 °C | 44.06 | 5 | 22 | 969.2 |
| Region IIIB | -32 °C | 43.44 | 5 | 23 | 999.0 |
| Region IV | -20 °C | 42.20 | 5 | 23 | 970.5 |
| Region V | -27 °C | 42.92 | 5 | 23 | 987.2 |
The minimum per string keeps the string voltage in heat (panel V_mp 26.8 V) above the MPPT window (120 V).
Input currents
| Panel I_sc / MPPT input I_sc, A | 14.42 / 25.0 |
|---|---|
| Panel I_mp / MPPT input I_mp, A | 13.65 / 20.0 |
| Parallel strings per MPPT | 1 |
| MPPT inputs | 3 |
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 | 12 | 5.16 | 1 | 12 pan. × 1 — inv. 1, MPPT 1 | 0.52 |
| ≈ 10 kW | 24 | 10.32 | 1 | 12 pan. × 1 — inv. 1, MPPT 1; 12 pan. × 1 — inv. 1, MPPT 2 | 1.03 |
| ≈ 15 kW | 35 | 15.05 | 2 | 7 pan. × 1 — inv. 1, MPPT 1; 7 pan. × 1 — inv. 1, MPPT 2; 7 pan. × 1 — inv. 1, MPPT 3; 7 pan. × 1 — inv. 2, MPPT 1; 7 pan. × 1 — inv. 2, MPPT 2 | 0.75 |
- DC/AC 0.52 — inverter oversized
- DC/AC 0.60 — inverter oversized
A preliminary calculation; a design needs an engineer's check. Solispec engine 0.12.0.