Import 300kw Dc To Ac Pure Sine Wave Off Grid Inverter — Buy in wholesale FOB from Supplier in China

The Zhejiang Sandi Electric 300 kW DC to AC pure sine wave off-grid inverter converts direct current from solar arrays or battery banks into alternating current for industrial and commercial loads. It employs SVPWM (space vector pulse width modulation) technology to achieve high conversion efficiency with low switching losses. The unit uses a sixth-generation Mitsubishi IPM module as its core power stage and a TI DSP28335 digital signal processor for control algorithms. Output waveform is pure sine wave, suitable for capacitive, inductive and non-linear mixed loads including motors, compressors and fluorescent lighting. DC input voltage ranges are configurable: 100-300 V, 200-500 V, or 500-850 V, selected to match the source array or battery configuration without requiring separate battery backup in solar-only systems.

The inverter chassis follows a modular, plug-in architecture that allows field replacement of sub-assemblies without specialist rework stations. An isolation transformer provides galvanic separation between DC input and AC output, with input and output circuit breakers integrated for installation cost reduction. Two soft-start modes are selectable: reduction voltage start and variable frequency start, chosen according to load inertia and torque requirements. Output voltage can be adjusted between -40 % and +20 % of nominal via the LCD panel, permitting site-specific grid-forming or standalone operation. Over-voltage, under-voltage, overload, short-circuit and improper-operation protection are all hardware-implemented through the IPM module's built-in sensing.

Target buyers include EPC contractors, solar integrators and industrial facility operators in off-grid or weak-grid locations requiring reliable 300 kW class AC power. Compatible loads span air conditioning, refrigeration, machine tools, pumps and general building services. The LCD plus LED display provides real-time readouts of input/output voltage, current, cumulative energy and fault codes to guide maintenance. Buyers should confirm with the supplier the exact efficiency curve at partial load, ambient temperature derating, and whether marine or tropical environmental coatings are available. The supplier's location in Yueqing Economic Development Zone, Zhejiang Province, places it within China's dense electrical manufacturing corridor, though response rate and verification status should be checked directly given the zero recorded response metrics.

Zhejiang Sandi Electric Co., Ltd. is registered at Building 13-2 Botong Huigu, No. 66 Binhai South Four Road, Yueqing Economic Development Zone, Yueqing City, Zhejiang Province, 325600, China. The company holds a Harbor trust tier, indicating a baseline platform verification level. The response rate is recorded at 0.00 % with zero average response hours, so buyers should treat direct communication as untested and plan accordingly. The listing presents the 300 kW inverter as a flagship solar and off-grid power conversion product without disclosing factory size, annual output, or in-house test capabilities.

The supplier's product literature emphasises imported core components (Mitsubishi IPM, TI DSP) and modular serviceability, positioning toward projects where local spare-part availability and technical documentation matter. No ISO certifications, patent holdings, or reference installations are stated in the source material. Buyers evaluating Zhejiang Sandi Electric against other Zhejiang-based power-electronics manufacturers should request factory audit reports, witness-test protocols for the 300 kW platform, and documentation of the IPM module supply-chain traceability. The Yueqing location is known for low-voltage electrical equipment manufacturing, giving proximity to component vendors and logistics hubs, though this does not by itself confirm production depth or quality-system maturity.