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MOSO Warranty Terms and Conditions


The standard warranty period for MOSO solar inverters is 60 months (5 years) from the date of purchase. Our end customer needs to provide the valid purchasing invoice to verify the date of purchase.

If our end customer fails to provide the valid purchasing invoice, the standard warranty period for MOSO solar inverters is 63 months (5.25 years) from the date of production (it’s on the SN) from Shenzhen Moso Power Supply Technology Co., Ltd.

Moso solar inverter offers a variety of warranty period . Please refer to Moso's price list for details.


In the case of a faulty inverter during the agreed MOSO solar warranty period, please report defective inverters with a brief error description to our service hotline for registering and send your warranty card to our service department by fax/email to process the warranty claim. You may also contact your dealer (MOSO solar authorized dealer or distributor) or installer if your unit is defective or faulty.

To make a claim under the warranty periods of MOSO solar, you need to provide us the following information and documentation of the faulty inverter:

l Product Model (e.g.SF5KTL) and product serial number (e.g. ST20KTNA19000380).

l A copy of the valid purchasing invoice and warranty card of the inverter.

l Error messages on the LCD screen (if available) and additional information about the fault/error.

l Detailed information about the entire system (module, PV system diagram, etc.).

l Documentation of previous claims/exchanges (if applicable).


If an inverter is faulty while it is under MOSO solar warranty period, it will be:

l Repaired by MOSO solar

l Repaired on-site

l Exchanged with a refurbished inverter that includes all firmware updates

If the inverter needs to be exchanged, the remainder of the warranty period will be transferred to the replacement unit, i.e. the warranty period of the original device will continue. In this event, you will not receive a new warranty card, and this replacement will be registered by MOSO solar. If the remaining warranty period is less than 6 months, you will automatically receive a 6-month warranty period for the replacement unit.

The warranty includes the cost of work and material necessary to regain faultless functioning inverters. All other costs, particularly transports, travel- and accommodation cost of MOSO solar personnel as well as costs of your own staff are not included in the warranty. Furthermore, claims for compensation for direct or indirect damages arising from the defective inverter are not covered by the warranty.

Faulty inverters and components should be returned to MOSO solar, they must be packed in their original or equivalent packaging for transportation.

MOSO solar keeps the right to arrange the warranty service for end users and to use third parties for performing warranty services.

All warranty services are free of charge only if the action is agreed with MOSO solar in advance. 


To provide excellent Service to MOSO solar’s end users, all MOSO solar authorized Dealers or Distributors are requested to respond to your warranty claim. MOSO solar will replace any products or parts of the product during the Warranty Period proved to be defective in design or manufacture. Any defect caused by the following situations will not be covered by the manufacturer’s warranty (the Dealers or Distributors are responsible and authorized by MOSO solar for the following investigation):

1)      “Warranty Card” not being sent back to Distributor/Dealer or MOSO solar;

2)      The Product has been modified, its design has been changed or parts have been replaced by parts not approved by MOSO solar;

3)      Changes have been made, or repairs been attempted by NON-MOSO solar technician, or series number or seals have been erased;

4)      The product has been installed or commissioned incorrectly;

5)      You or another user have failed to comply with the safety regulations (VDE standards or equivalent);

6)      The product has been improperly stored and damaged while being stored by the dealer or the end user;

7)      The defect is damage during transportation (including painting scratch caused by movement inside packaging during shipping). A claim for such transport damage should be made directly to shipping company/insurance company as soon as the container/packaging is unloaded and such damage is identified;

8)      You or another user have failed to follow any/all of the user manual, the installation guide, and the maintenance regulations;

9)      The device has been used improperly or misused;

10)   Insufficient ventilation of the device;

11)   The maintenance procedures relating to the product have not been followed to an acceptable standard;

12)   The defect has been caused by force majeure (violent or stormy weather, lightning, overvoltage, fire etc.).

13)   The damage is only cosmetic and has no impact on the functioning of the device

This warranty is without prejudice to your rights under the statutory law, including but not limited to warranty rights in relation to the seller, i.e. if applicable rectification, reduction of the price, rescission of the sale and damages.

All demands from or in connection with this warranty are subject to Chinese law, Shenzhen is the exclusive place of jurisdiction and all disputes arising from or in connection with this warranty should be submitted for arbitration to the South China International Economic and Trade Arbitration Commission.


For MOSO solar inverters, you may apply for a warranty extension during 12 months from the date of production from MOSO solar by providing the serial number and copy of the warranty card of the unit. MOSO solar may reject any application received which does not meet the date requirement. Extended warranty period can be purchased to 10, 15, 20 or 25 years. Refer to the Warranty Extension Order Form for more information.

Once the purchase of the warranty extension has been processed, MOSO solar will send the warranty extension certificate to the customer confirming the extended warranty period.

Latest information about the warranty terms and conditions and local service hotline can be obtained from our website: www.mosopower.com


Contact us

If you have any questions, please contact us in the following ways

NAME: Moso Power Supply Technology Co., Ltd

ADD: Moso Industrial Park, Xili street, Nanshan District, Shenzhen 518108,China


TEL: 400-756-5188

Q: Will my system work at night and on cloudy days?

A: Your system will not work at night because solar modules need sunlight to produce power. Solar modules will still produce power on a cloudy day although they will probably only produce about half as much as under full sun.


Q: How does a residential solar electric system work?

A: The solar cells in the modules convert the sun’s energy into a DC electrical current. This DC current flows into an inverter which changes the DC electricity to AC electricity in order to run household appliances. The AC electricity flows into your electrical service panel to supply power to your home. If your system produces more electricity than you use, the excess electricity is re-routed to your utility line and, in states with net metering laws, is sold to the utility. The utility provides power at night and during the day when your electrical demand exceeds what your solar system produces. During a power outage, your solar system automatically shuts down unless the system includes battery backup.


Q: Will my solar system make hot water?

A: Our solar modules convert sunlight into electricity to operate appliances, lights and other devices and will not heat water. SunWize does not sell solar thermal panels or systems used for water heating.


Q: Can my solar electric system generate heat for my home?

A: SunWize solar power systems are only designed to provide electricity to run your lights, appliances and other electric devices in your home and will not convert the sun's light into heat. SunWize does not sell or design passive solar systems for heating your home.


Q: How do I know if my home is suitable for a solar electric system?

A: Solar electric systems are a viable power solution for most homes. SunWize systems are engineered for roof or ground installations in almost any location of the United States where direct sunlight is available. You'll need an unobstructed area of about 120 square feet for a small system, and up to 1,000 square feet for a large system. The site must be free from shading because of the wiring design of a solar module. If any portion of the module is shaded, the entire module power output is lowered. A south-facing roof area is ideal, but a west- or east-facing roof can still produce approximately 90 percent of the power of a south-facing roof.


Q: Where are solar electric modules installed?

A: Solar modules can be ground mounted or roof mounted. Roofs can be asphalt shingled or steel. If your roof shingles will need replacement in a few years, it would be wise to replace them before the system is installed.


Q: Can I install the system myself?

A: No. Systems must be installed by a qualified electrical contractor or solar installer.


Q: How much will a system cost?

A: Currently(8-06), the installed cost for a system averages between $9.00 and $11.00 per watt. However, many states or utilities offer rebate and tax credit programs which may lower your cost by up to 50%, saving you thousands of dollars. Visit www.dsireusa.org for information about your State's incentives and Federal tax credits that can help reduce the cost of your system.


Q: I'm planning on building a new house, when is the best time to install a system on my roof?

A: Before laying the roof, you can install flashable mounting brackets that provide the highest level of protection from leakage.


Q: What size system do I need to produce enough electricity to run my house?

A: The system size depends on your average electrical usage, climate, roof angle and many other factors. As a rough guide, multiply your average daily electrical demand in kilowatt-hours by 0.25. The result is the approximate size of solar array, in kilowatts, needed to meet your electrical demand. We recommend using the SunWize Solar Design Guide to more accurately determine your electrical needs and the size of your system.


Q: Will a system produce enough energy to cover all my electricity needs?

A: The amount of power produced by a system varies depending on the size of the system, your geographic location and climate and whether the system has a battery backup. You certainly can buy a system large enough to cover all of your electrical needs. However, a solar electric system does not need to provide all of the electricity you require to be of value. A system displacing an average of one-quarter to one-half of your average demand reduces your electric bill. With battery backup, a system can deliver uninterrupted power to critical loads during utility outages for days or weeks. Reducing your electricity by 40 to 50 percent is typically the most cost-efficient approach for home solar power.


Q: How long will my solar power system last?

A: Most solar modules show little degradation over many years of operation and carry a 25 year manufacturer’s warranty. They typically have a 50+ year life expectancy. This makes solar power a highly reliable source of power. Batteries in a backup system may need replacement in five to 10 years.


Q: What maintenance does the system require?

A: We recommend that your installer perform a system check once a year, just to make sure everything is performing as it should. The modules usually don't require any more maintenance then hosing them off two or three times a year.


Q: Do I need a building permit?

A: In most areas a permit is required. Your qualified installer will know how to obtain the necessary permits from your local government.


Q: Do I need approval from my homeowners' association?

A: If you belong to a homeowners’ association, consult your covenants for details. Many states prohibit homeowners’ associations from restricting solar devices. Florida law forbids ordinances, deed restrictions, covenants, or similar binding agreements from prohibiting solar equipment use... read more


Q: Do I need permission from the local utility to connect my solar system to the grid?

A: The local utility has rules and procedures that must be followed to connect any generator to the grid safely and legally. Your dealer will help you with the documentation and procedures.


Q: Can I be totally independent from the utility?

A: Our grid-tied solar electric systems are designed to interconnect with existing utility service. Off-grid systems must be custom designed by a qualified solar power installer.