Question 1

What is the return and replacement policy?

Accepted Answer

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.

Question 2

What should I do if the inverter output voltage is unstable or load capacity is poor?

Accepted Answer

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.

Question 3

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

Accepted Answer

An insulation fault is usually caused by poor PV-to-ground insulation. Please check: 1. Whether PV panels and cables are damp or damaged; 2. Whether DC connectors are properly waterproofed; 3. Whether PV cables are touching the metal roof. The fault usually clears once the issue is resolved. If it persists, contact a professional for inspection.

Question 4

Which is better for a hybrid inverter: lithium or lead-acid batteries?

Accepted Answer

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.

Question 5

What should I do if the inverter arrives damaged?

Accepted Answer

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

Question 6

What should I do if the battery is not charging or charges slowly?

Accepted Answer

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.

Question 7

What should I do if the fan is not running or is noisy?

Accepted Answer

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

Question 8

How should I maintain the inverter to ensure longevity?

Accepted Answer

1. Keep the installation environment well-ventilated and dry; clean the cooling fan and heatsink regularly; 2. Periodically check that terminals are tight; 3. Ensure the display shows normal data; 4. Check waterproof seals for outdoor installations before rainy seasons; 5. We recommend a professional inspection every 6-12 months.

Question 9

What should I do if WiFi cannot connect or disconnects at night?

Accepted Answer

1. Confirm the WiFi is 2.4GHz band (5GHz is not supported); 2. Check that the password is correct; 3. Check whether the inverter is set to night low-power mode—if so, it will auto-recover when DC power returns the next day; 4. Restart both the router and the inverter and try again.

Question 10

What should I do if the inverter shows an error code or red light?

Accepted Answer

The inverter LCD screen or mobile app will display a specific error code. Common faults include: grid over/under voltage, PV insulation fault, over-temperature, fan failure, etc. Please record the error code and troubleshoot according to the manual. If unresolved, contact technical support with the model and error code

Question 11

What should I do if the inverter will not power on?

Accepted Answer

Please check: 1. Whether the battery voltage is normal (not depleted); 2. Whether the battery polarity connection is correct—never reverse positive and negative; 3. Whether the DC breaker/fuse is on or blown; 4. Whether PV input is normal. If all checks pass and it still does not power on, please contact technical support.

Question 12

How long is the inverter warranty period?

Accepted Answer

The standard warranty is typically 2-5 years, and some premium grid-tie inverters can be extended to 10 years. The warranty period starts from the date of delivery. Non-human-caused defects are covered with free repair or parts replacement.

Question 13

Can the inverter connect directly to solar panels?

Accepted Answer

Off-grid inverters usually have a built-in MPPT solar charge controller and can connect directly to PV panels. Grid-tie inverters also connect directly to PV strings. However, pure DC-AC inverters (without MPPT) require a solar charge controller between the panels and battery, and then the battery connects to the inverter.

Question 14

What battery types are compatible?

Accepted Answer

Hybrid inverters are compatible with lead-acid batteries (flooded/gel) and lithium batteries (LiFePO4). The battery type can usually be selected in the settings menu. Lithium batteries are recommended for longer lifespan and higher efficiency, but the inverter itself does not include a battery.

Question 15

What information is needed to customize an inverter?

Accepted Answer

We need: 1. Required power (kW); 2. Output voltage and frequency (110V/220V, 50/60Hz); 3. Battery voltage type; 4. PV input requirements (MPPT count, max voltage); 5. Communication/monitoring requirements; 6. Brand and packaging requirements; 7. Target market and required certifications.

Question 16

What is the IP rating? Can it be installed outdoors?

Accepted Answer

Grid-tie inverters typically have IP65 protection and can be wall-mounted outdoors. Off-grid/hybrid inverters are often IP20/IP43 and are recommended for indoor installation in well-ventilated locations or distribution boxes. Ensure adequate ventilation space during installation, avoiding direct sunlight and water immersion.

Question 17

Is it single-phase or three-phase? What is the power range?

Accepted Answer

Small residential models are mostly single-phase output (3kW-12kW). Commercial/industrial models are three-phase (10kW to hundreds of kW). Off-grid hybrid inverters typically range from 1kW to 12kW, while grid-tie inverters cover 1kW to 250kW+.

Question 18

Does the inverter have WiFi monitoring? Is there a mobile app?

Accepted Answer

Yes, most models come with a built-in WiFi module supporting 2.4GHz WiFi. You can monitor real-time generation, consumption, and battery status via a mobile app (iOS/Android). Some models also support Bluetooth, RS485, and CAN communication.

Question 19

Can multiple inverters be parallel-connected?

Accepted Answer

Most hybrid inverters support parallel operation via dedicated parallel cables. Up to multiple units can be paralleled (depending on model, commonly 9+), supporting single-phase and three-phase split-phase output. A dedicated parallel kit is required.

Question 20

What battery voltages are compatible?

Accepted Answer

Common battery voltages for off-grid/hybrid inverters are 12V/24V/48V. Models under 3kW are often 24V or 48V; 3kW and above are typically 48V. Some models support automatic battery voltage detection. Grid-tie inverters (battery-less) do not require a battery.

Question 21

What is the inverter efficiency?

Accepted Answer

Solar inverter maximum efficiency is typically 97%-99%, with European efficiency around 96%-97%. Pure sine wave output with THD<3%. Please refer to the datasheet of the specific model for exact efficiency parameters.

Question 22

How many MPPT trackers does the inverter have?

Accepted Answer

Small off-grid/hybrid inverters typically have 1-2 MPPT trackers with max PV input voltage around 450VDC. Medium-to-large grid-tie inverters usually have 2 MPPTs, and premium models have 3+. The number of MPPTs affects the flexibility of PV string configuration.

Question 23

What is the minimum order quantity？

Accepted Answer

The minimum order quantity (MOQ) for standard models is typically 5–10 units; requirements for OEM customization (such as logos and packaging) are subject to negotiation. There is no minimum quantity for sample orders.

Question 24

Can I have solar inverter samples to test? What is the lead time for sample order?

Accepted Answer

Yes, we can supply samples. In-stock products ship in 3-6 days; customized samples take 7-10 days depending on requirements. Sample cost and shipping fees are borne by the buyer.

Question 25

What is the difference between on-grid, off-grid, and hybrid inverters?

Accepted Answer

On-grid inverters are used only in grid-connected systems and feed excess solar power back to the grid. Off-grid inverters power remote systems without grid access and require battery storage. Hybrid inverters combine both functions—they can feed power to the grid and also store energy in batteries, making them the most popular choice today.