Configuration Diagram: Three 6kW Inverters for 3-Phase 380V Output

Topology Diagram: Three 6kW Inverters for 3-Phase 380V Output

2. Core Equipment Parameters & PV String Voltage Verification

(1) Basic Parameters of Core Devices

PV Module (650W)

Single module power: 650W under STC MPP voltage (Vmpp): 49.99V Open-circuit voltage (Voc): 50.12V Temperature coefficient of open-circuit voltage: -0.25%/°C Total installed PV capacity: 24×650W = 15.6kW

All-in-One Inverter SW6200-48PL

Rated single-unit output: 6.2kW 48V battery platform MPPT DC operating range: 60VDC~500VDC Maximum allowable PV open-circuit voltage: 500V Supports parallel connection of up to 12 units. Three single-phase inverters connected in parallel output three-phase power, adaptive to unbalanced three-phase elevator loads. The unit is lightweight and transportable by one person, fitting construction in narrow stairwells.

All-in-One Inverter SW6200-48PL

Energy Storage Battery SW-T51.2V16KWH-S

Nominal voltage: 51.2V, perfectly matched with 48V-platform all-in-one inverters. Multi-layer safety protection is built into cells, modules and the whole system, steadily storing 16kWh daily surplus solar power to supply emergency power for elevators during grid outages.

Energy Storage Battery SW-T51.2V16KWH-S

(2) PV String Topology & Voltage Calculation

(3) Capacity Matching Verification

Total PV capacity: 15.6kW Each inverter accepts max 6.5kW PV input, total PV bearing capacity of three inverters reaches 19.5kW, leaving sufficient capacity margin for the installed PV array. Total rated AC output of three inverters: 18.6kW. Parallel three-phase output withstands 100% unbalanced loads, covering elevator startup inrush and continuous operating power demand. 16kWh battery capacity matches the daily 16kWh surplus storage volume. Solar power feeds loads first in daytime, and surplus energy is stored for discharge at night or during blackouts to sustain elevator operation.

3. System Operation Logic

Daytime with Sufficient Solar Irradiance

DC power generated by PV arrays is optimized via built-in MPPT modules of SW6200-48PL inverters and converted into 230V AC power to supply elevator loads directly, maximizing on-site consumption of solar power and reducing mains power reliance.

Solar Output Exceeds Load Demand

Excess DC power automatically charges the 51.2V energy storage battery, with a maximum daily storage volume of 16kWh. Once the battery reaches the upper SOC limit, charging stops automatically to prevent cell overcharging damage.

Low Irradiance, Nighttime or Grid Outage

Without solar generation or during blackouts, the storage battery discharges power converted to three-phase AC by three parallel inverters to run elevators continuously. When battery energy drops to the protection threshold, the system seamlessly switches to mains power backup to avoid passenger entrapment.

Long-Term Overcast & Low Irradiance

When solar output is insufficient and battery capacity depletes to the lower limit, the system automatically switches to mains supply to maintain all-day normal elevator operation.

4. Core Advantages of the Solution

Lightweight Off-Grid Customization Adapted to Local Conditions

Redundant grid-tied modules are eliminated to fit Palestine’s lack of grid export access and lower equipment costs. The compact SW6200-48PL inverter can be carried by a single worker in narrow stairwells, cutting labor construction costs and accelerating project delivery.

Precise Voltage Matching & High Solar Utilization

Full-range high/low-temperature voltage verification is performed for PV strings, enabling long-term operation within the inverter’s optimal MPPT range. The system delivers stable daily power generation of 78kWh to maximize self-consumption benefits.

Adaptive Three-Phase Parallel Connection for Stable Elevator Power Supply

Three single-phase all-in-one inverters form a three-phase power supply system, supporting 100% unbalanced load output and enduring elevator startup surge loads. Failure of one unit will not shut down the whole system for higher operational reliability.

Multi-Layer Safety Protection & Convenient O&M

Inverters integrate multi-protection functions against overcharge, overdischarge, overload and short circuit. Energy storage batteries feature triple safety protection at cell, module and system levels. The system supports WIFI remote monitoring and real-time display of generation, storage and load data via local LCD screens. Modular structure facilitates later maintenance and capacity expansion.

Flexible System Expansion for Long-Term Development

Inverters support parallel expansion of multiple units, and storage batteries allow parallel stacking to boost capacity. Additional PV modules and storage devices can be added for future elevator retrofits or new power loads, delivering excellent system scalability.

Reference Case: PV Water Pump System in Punjab, India

5. Project Benefit Summary