| 1 | Output Waveform | Pure sine-wave output for sensitive household electronics, motors, appliances, and medical equipment. | Product datasheet showing waveform type, total harmonic distortion specification, and an independent test report where available. | Pure sine-wave power generally provides cleaner AC power and reduces compatibility risks. |
| 2 | Rated Power and Surge Capacity | Select continuous output based on the total load, with additional capacity for refrigerator, pump, air-conditioner, and other motor-starting loads. | Continuous power, peak or surge power, surge duration, overload curve, and test conditions at the declared rating. | Motor-driven appliances can require substantially more power during startup than during normal operation. |
| 3 | Input and Output Compatibility | Confirm the required battery voltage, AC voltage, frequency, connector type, and regional grid configuration before ordering. | Electrical specification sheet, wiring diagram, selectable frequency settings, and country-specific user manual. | China commonly uses 220 V and 50 Hz, while destination markets may require different voltage, frequency, or plug configurations. |
| 4 | Inverter Topology and Operating Mode | Choose an off-grid, grid-tied, or hybrid configuration according to whether backup, solar self-consumption, export, or battery charging is required. | Functional block diagram, operating-mode list, transfer logic, grid-interconnection documentation, and compatibility list. | Different inverter types have different installation rules, protection requirements, and permitted grid functions. |
| 5 | Efficiency and Standby Consumption | Compare peak efficiency, efficiency at typical household loads, and no-load or standby consumption rather than relying on a single maximum figure. | Efficiency curves, test conditions, rated-load data, standby consumption, and thermal derating information. | Higher practical efficiency reduces battery energy loss, heat generation, and operating cost. |
| 6 | Safety and EMC Compliance | The product should have documentation appropriate for the destination market, including applicable electrical safety and electromagnetic-compatibility requirements. | Valid test reports and certificates referencing applicable standards such as IEC 62109-1, IEC 62109-2, and relevant EMC standards. | Verified compliance helps reduce electrical, fire, interference, customs, and installation risks. |
| 7 | Protection Functions | Look for over-temperature, overload, short-circuit, over-voltage, under-voltage, reverse-polarity, and low-battery protection where applicable. | Protection list, alarm codes, shutdown thresholds, recovery behavior, and installation requirements. | Comprehensive protection improves user safety and can limit damage caused by abnormal operating conditions. |
| 8 | Battery and Solar Compatibility | Verify compatibility with the chosen battery chemistry, battery-management communication protocol, charge voltage, PV voltage range, and maximum charging current. | Battery compatibility matrix, CAN or RS485 protocol details, MPPT voltage range, maximum PV input, and commissioning instructions. | Incorrect charging parameters or communication settings may reduce performance or create safety problems. |
| 9 | Factory Quality Control and Traceability | Prefer suppliers able to provide production testing, serial-number traceability, incoming-component control, and documented corrective actions. | Quality-management certificate, sample inspection report, burn-in procedure, calibration records, and batch traceability process. | Documented quality systems make product consistency easier to verify and after-sales problems easier to resolve. |
| 10 | Warranty, Support, and Total Cost | Compare warranty duration, spare-parts availability, firmware support, response time, MOQ, lead time, Incoterms, and landed cost. | Signed warranty terms, service-level commitments, replacement procedure, spare-parts price list, firmware policy, and complete quotation. | A lower purchase price may be outweighed by installation complexity, downtime, freight, replacement parts, or limited technical support. |