What should I do if the inverter shows insulation fault / residual current?

You may request inspection within 15 days of delivery. Quality issues not caused by human factors are covered by free repair or replacement during the warranty period. Damage caused by improper installation, wiring errors, water ingress, lightning, or other human/force-majeure causes is not covered. Return shipping costs are borne by the responsible party.

Please check: 1. Whether the battery voltage is sufficient (low voltage causes output drop); 2. Whether total load power exceeds the inverter rating; 3. Whether surge power from inductive loads (AC, fridge) is within the inverter's tolerance (typically 2× rated power); 4. Whether AC connections are secure.

Lithium (LiFePO4) batteries offer longer cycle life (3,000-6,000 cycles vs 500-1,500), higher efficiency, smaller size, and less maintenance. Although the upfront cost is higher, they are more economical long-term. Lead-acid batteries are cheaper but shorter-lived and require regular maintenance. Choose based on budget and expected service life.

Please inspect the package upon delivery. If you find visible damage, deformation, or missing accessories, take photos/videos immediately and contact us. For confirmed shipping damage, we will arrange spare parts reshipment, unit replacement, or refund. Return shipping costs are borne by the responsible party

Please check: 1. Whether the PV panels are generating normally (MPPT voltage reading); 2. Whether the battery type setting is correct (lead-acid/lithium); 3. Whether the charging current limit is set too low; 4. Whether battery connections are secure; 5. Whether the battery is already full or in protection mode.

Inverters feature temperature-controlled automatic cooling fans that only operate when needed, running quietly most of the time. If the fan does not work at all, it may be a loose fan cable connection, a defective fan, or a PCB failure