Project Description
150kwh PV off-grid system for street lamps
1. Overview
The PV off-grid system mainly consists of PV modules, combiner box, off-grid inverter, battery bank and user loads. Off-Grid inverter range is available in models from 10 kVA ~ 120 kVA with DSP digital control technology, it is combined with pulse-width modulation (SVPWM), disturbance MPPT control and multi-level control technology to enable the system to track the maximum power of PV modules fast. Its secure power supply feature provides good quality power with regulated voltage and frequency to the loads, and it is featured with energy storage and staggering power consumption as well. It is an ideal inverter for medium-sized or large-scale residential, commercial and industrial PV applications which are off the grid, such as village, farm, factory, office building and islands etc.
2. PV Modules Specification
This 150kwh PV off-grid system is powered by 120pcs 270w solar panels.
| No. | Item | Parameters |
|---|---|---|
| 1 | Max Power(Pmax) | 270w(±5%w) |
| 2 | Max Power Voltage(Vmp) | 30.5V |
| 3 | Max Power Current(Imp) | 8.5A |
| 4 | Open Circuit Voltage(Voc) | 37.2V |
| 5 | Short Circuit Current(Isc) | 9A |
| 6 | Max Rectified Current | 10A |
| 7 | Max Series Fuse | 15A |
| 8 | Max Temperature | 85℃ |
| 9 | Max System Voltage | 1000Vdc |
| 10 | Weight | ≈18kg |
| 11 | Dimensions | 1640x992mm |
3. 150kwh PV off-grid system Inverter Specification
AC mains power is input via the rectifier switch and is converted to DC power to charge the battery and power up DC bus. Solar power input is converted by a PV switch through MPPT power module to supply to the battery and DC bus. The inverter module converts the DC power of DC bus to pure AC power free from the mains interference. In the event of mains supply interruption, backup power is provided to the load by the battery and MPPT module through inverter module. For inverter failure or overload timeout, loads can be driven by AC bypass through bypass breaker and bypass static switch. In addition, to maintain or service the system, maintenance switch can be manually controlled to power the loads. When the system is in normal operation, all switches except the maintenance switch are closed.
150kwh PV off-grid system Inverter Technical Data
| No. | Item | Technical Data | |
|---|---|---|---|
| 1 | Rated power | 20kVA | |
| 2 | Rated current | 30A | |
| 3 | Output power factor | 0.9 | |
| 4 | Operating mode | AC and PV complementation | |
| 5 | PV INPUT | Max. voltage(Voc) | 750Vdc |
| Optimum operating voltage(Vmp) | 450~550Vdc | ||
| Max. conversion efficiency | ≥98% | ||
| MPPT Max. current | 60A | ||
| Max. PV power | 25kw | ||
| 6 | AC RECTIFIER | Input voltage range | 380 V ± 20% three-phase |
| Rated frequency | 50 Hz / 60 Hz ± 5 Hz (settable) | ||
| Power factor | 0.8 | ||
| Max. charging current | 25A | ||
| 7 | INVERTER | Inverter voltage | 380 Vac three-phase + N+PE |
| Phase voltage | 220 / 230 / 240 Vac (settable) | ||
| Rated frequency | 50 / 60 Hz ± 1 Hz (settable) | ||
| Waveform distortion | Sinusoidal | ||
| Max. efficiency | ≥ 91% | ||
| 8 | Communication Interface | RS232, RS485, SNMP (optional) | |
| 9 | Remote control | Inverter startup, shutdown, abnormal clearance, EPO, battery self-test | |
| 10 | Dry contacts output | Bypass input abnormal, rectifier input abnormal, system fault, system alarm, low battery, output overload, fan fault, generator ON / OFF | |
| 11 | IP Rating | IP 20 | |
| 12 | Dimensions | 450 × 840 × 1100(mm) | |
| 13 | Weight | 245kg | |
4. 150kwh PV off-grid system LiFePO4 battery pack Specification
This system is built-in Lithium-iron phosphate battery(LiFePO4), very high Energy Density(>140wh/kg), high gravimetric and volumetric energy density and high cycle life(>5000times, calendar lifespan up to 10years). Lithium-iron phosphate batteries are considered to be the safest batteries, it is widely used in Electric vehicles and home energy storage fileds.
| No. | Item | Parameters |
|---|---|---|
| 1 | Nominal voltage | 358.4V |
| 2 | Rated capacity | 420AH |
| 3 | Rated energy | 150kwh |
| 4 | Voltage Range | 280～408.8V |
| 5 | Rated charge current | 80A |
| 6 | Max charge current | 120A |
| 7 | Rated discharge current | 80A |
| 8 | Max continuous discharge current | 200A |
| 9 | Operating Temperature | 0～55℃ |
| 10 | Battery type | LiFePO4 |
| 11 | Lifespan | >5000times |
