SolaX Power X3-FORTH Series - User Manual

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SolaX Power Network Technology (Zhe jiang) Co., Ltd.

X3-FORTH SERIES USER MANUAL

40kW - 150kW

The copyright of this manual belongs to Solax Power Network Technology (Zhe jiang)

Co., Ltd. Any corporation or individual should not plagiarize, partitially or fully copy

(including software, etc.) , and no reproduction or distribution of it in any form or by

reserves the right of final interpretation.

NO.288 Shizhu Road, Tonglu Economic Develpoment Zone, Tonglu City, Zhejiang

province, China.

Tel: +86 0571-56260011

E-mail: info@solaxpower.com

www.solax.power.com

614.00663.02

Main Page

Other manuals for SolaX Power X3-FORTH Series

Quick Installation Guide2 pages

Questions and Answers

J
Jacob LewisAug 29, 2025
What to do if SolaX Power X3-FORTH displays GridVol_OP_10M error?
- V
  victor22Aug 29, 2025
  If your SolaX Power Inverter displays a GridVol_OP_10M error, check whether the grid voltage is within the allowable range. Then, try to re run the inverter.
B
Brandon JohnsonAug 28, 2025
What does GridFreq_UP1 mean on my SolaX Power Inverter and how to fix it?
- W
  Wendy JohnsonAug 28, 2025
  If your SolaX Power Inverter displays a GridFreq_UP1 error, check whether the power grid frequency is within the allowable range. Then, try to re run the inverter.
M
Michelle StokesAug 27, 2025
What does GridFreq_OP1 mean on my SolaX Power X3-FORTH Inverter and how to fix it?
- C
  Crystal CastilloAug 27, 2025
  If your SolaX Power Inverter displays a GridFreq_OP1 error, check if the power grid frequency is within the allowable range. If it is, try restarting the inverter.
D
Dillon LuceroAug 27, 2025
What does GridVol_UP1 mean on my SolaX Power X3-FORTH Inverter and how to fix it?
- Q
  qwoodAug 27, 2025
  If your SolaX Power Inverter displays a GridVol_UP1 error, verify that the grid voltage is within the allowable range. If it is, try restarting the inverter.
P
pooleloriAug 25, 2025
What to do if SolaX Power X3-FORTH displays GridVol_OP1 error?
- S
  Scott JacksonAug 26, 2025
  If your SolaX Power Inverter shows a GridVol_OP1 error, check whether the grid voltage is within the allowable range. Then, try to re run the inverter.
D
David PalmerAug 25, 2025
What should I do if my SolaX Power X3-FORTH displays PV_VolHigh?
- J
  Joanna RussellAug 25, 2025
  If your SolaX Power Inverter shows a PV_VolHigh error, start by checking the PV voltage to ensure it's within the allowable range. If it is too high, reduce the number of PV modules in series to lower the PV voltage. If the problem persists, contact the installer.

The SolaX X3-Forth Series inverter is a three-phase, transformerless grid-connected inverter designed for photovoltaic power generation systems. Its primary function is to convert direct current (DC) generated by photovoltaic panels into alternating current (AC) for self-consumption or feeding into the public grid. The series includes models ranging from 40kW to 150kW, with specific voltage ranges for different power outputs: 40K/50K/60K/70K inverters operate in the 220 V / 127 V low voltage range, 80K/100K/110K/120K/125K inverters in the 220 V / 380 V range, and 136K/150K inverters in the 500 V / 540 V medium voltage range.

Function Description

The X3-Forth series plays a crucial role in photovoltaic systems by efficiently converting DC power from solar panels into usable AC power. It is equipped with multi-channel Maximum Power Point Tracking (MPPT) to ensure maximum power extraction even under varying photovoltaic input conditions. The inverter integrates lightning arresters on both the AC and DC sides for surge protection. It supports various power grid types including TN-S, TN-C, TN-C-S, TT, and IT.

Important Technical Specifications

The X3-Forth series offers a wide range of power outputs and electrical characteristics:

DC Input:
- Max. DC Power: Ranges from 60 kW (40K-LV) to 225 kW (150K-MV).
- Max. DC Voltage: 800 V for 40K-70K models, 1100 V for 80K-150K models.
- Rated DC Voltage: 360 V for 40K-70K models, 600 V for 80K-125K models, and 730/785 V for 136K-150K models.
- Start Input Voltage: 200 V across all models.
- MPPT Voltage Range@full load: 180-650 V for 40K-70K models, 500-800 V for 80K-150K models.
- Max. DC Current / MPPT: 32 A for all models.
- Max. Short Circuit Current / MPPT: 46 A for all models.
- No. of MPP Trackers: 9 for 40K-50K and 80K-110K models, 12 for 60K-70K and 120K-150K models.
- Strings of MPP Tracker: 18 for 40K-50K and 80K-110K models, 24 for 60K-70K and 120K-150K models.
AC Output:
- Rated AC Power: Ranges from 40 kW (40K-LV) to 150 kW (150K-MV).
- Max. Active Power: Ranges from 44 kW (40K-LV) to 165 kW (150K-MV).
- Max. Apparent AC Power: Ranges from 44 kVA (40K-LV) to 165 kVA (150K-MV).
- Nominal AC Voltage: 220/127 V (3/N/PE) for 40K-70K, 3x220/380 V or 3x230/400 V (3W+(N)+PE) for 80K-125K, and 500/540 V (3P3W+PE) for 136K-150K.
- Nominal AC Frequency: 50/60 Hz.
- Total Harmonic Distortion (THDi): <3% (Rated power).
- DC Component of AC Current: <0.5%.
- Power Factor: >0.99 (Rated power), with a range of 0.8 leading to 0.8 lagging.
Efficiency, Safety and Protection:
- Max. Efficiency: 98.0% for 40K-70K models, 98.6% for 80K-125K models, and 99.0% for 136K-150K models.
- Safety Features: DC Switch, DC isolation protection, Monitoring ground fault protection, Grid protection, Over current protection, Overload protection, Anti-Islanding protection, DC Surge protection (Type II), AC Surge protection (Type II), Residual current detection, DC injection monitoring, and Over heat protection are all standard.
- Isolation Type: Non-isolated.
- Protective Class: IP66, allowing outdoor installation.
General Data:
- Self-consumption (night): <10 W.
- Operating Temperature Range: -25°C to +60°C (derating at +45°C).
- Operation Relative Humidity: 0-100% RH.
- Cooling: Smart air cooling for 40K-70K, Forced air cooling for 80K-150K.
- Altitude: 4000 m (derating at 3000 m).
- Dimensions (W/H/D): 985 x 660 x 327.5 mm.
- Weight: 84 kg for 40K-70K, 77 kg for 80K-120K, 83.3 kg for 125K-150K.
- Display: LED indicator x 4, LCD (Optional).
- Communication Interfaces: RS485/External WiFi/4G modular (Optional).
- Standard Warranty: 5 years (Optional 10 years).

Usage Features

Flexible Installation: The inverter can be mounted on a wall or a stand. It requires a minimum inclination angle of 10° for flat installation and must be installed more than 500 mm above the ground. Specific clearance (≥600 mm top, ≥700 mm sides, ≥500 mm bottom) is required for optimal heat dissipation and maintenance access.
Robust Design: IP66 ingress protection allows for outdoor installation, making it suitable for various environments.
Advanced Monitoring and Control:
- Current monitoring on each MPPT tracker.
- Smart I-V curve scan.
- Support for electric ARC monitoring (optional) and AC output terminal temperature monitoring.
- Remote error diagnoses and firmware upgrade capabilities.
- Reactive power compensation during the night.
- Adjustable fan speed for smart air cooling.
- Power factor regulation.
- Friendly Human-Machine Interface (HMI) with LED status indications and an optional LCD display for technical data and interaction via press keys.
- Dry contact communication interface.
- PC remote control.
- Remote and USB interface upgrades.
- RS485/PLC communication interfaces are available, with optional Wi-Fi/4G connectivity for cloud monitoring.
Safety Features:
- Built-in Residual Current Device (RCD) for protection against electrocution and fire, with trip thresholds of 30 mA for electrocution and 300 mA for slow rising current.
- Active Frequency Drift (AFD) to prevent islanding effect.
- Comprehensive safety instructions and warnings regarding high voltages, hot surfaces, radiation effects, and proper grounding.
- Requires qualified electricians for all installation and maintenance tasks.

Maintenance Features

Routine Maintenance: To ensure long-term proper operation, routine maintenance is advised. This includes cleaning the cooling fins and checking the fan regularly (recommended annually).
Fan Maintenance: The external fan should be cleaned regularly. If the fan fails due to prolonged service life, it requires professional repair or replacement. The procedure involves disconnecting AC and DC power, waiting 5 minutes for discharge, removing fixing screws, pulling out the fan bracket, disconnecting the waterproof connector, and then cleaning or replacing the fan.
Periodic Checks: Qualified personnel should perform periodic checks at least every 6 months, including:
- Inspecting cooling fins for dirt and cleaning as necessary.
- Verifying normal operation of inverter indicators and display.
- Checking input and output wires for damage or aging.
- Ensuring secure connection of grounding terminals and cables, and proper sealing of all terminals and ports.
- Cleaning PV panels and checking their safety.
Troubleshooting: The manual provides detailed troubleshooting steps for various error codes and issues, including PV insulation faults, meter direction errors, grid frequency/voltage issues, MPPT overcurrents, and internal hardware/software faults.
Decommissioning: The process for dismantling the inverter includes switching off DC and AC power, disconnecting all cables, waiting 5 minutes for de-energization, and removing the inverter from its bracket. Proper packaging, storage, and disposal according to local waste handling regulations are also outlined.