COREMAX Warranty Terms and Conditions


The standard warranty period for COREMAX 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 COREMAX inverters is 63 months (5.25 years) from the date of production (it’s on the SN) from coremax technology Co., Ltd.

Our end customer can also purchase an extension of this COREMAX standard warranty during 12 months from the date of manufacturing. Refer to the COREMAX price list for further information.


In the case of a faulty inverter/battery during the agreed COREMAX 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 (COREMAX authorized dealer or distributor) or installer if your unit is defective or faulty.

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

  • Product Model (e.g. CMX84100S) and product serial number (e.g. SC1ES520E99001).
  • A copy of the valid purchasing invoice and warranty card of the inverter.
  • Error messages on the LCD screen (if available) and additional information about the fault/error.
  • Detailed information about the entire system (module, PV system diagram, etc.).
  • Documentation of previous claims/exchanges (if applicable).


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

  • Repaired by COREMAX
  • Repaired on-site
  • Exchanged with a refurbished inverter/BATTERY that includes all firmware updates

If the Battery/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 COREMAX. 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 BATTERY/ inverters. All other costs, particularly transports, travel- and accommodation cost of COREMAX 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 battery/inverter are not covered by the warranty.

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

COREMAX 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 COREMAX in advance. 


To provide excellent Service to COREMAX’S end users, all COREMAX authorized Dealers or Distributors are requested to respond to your warranty claim. COREMAX 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 COREMAX for the following investigation):

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

2)      The Product has been modified, its design has been changed or parts have been replaced by parts not approved by COREMAX;

3)      Changes have been made, or repairs been attempted by NON-COREMAX 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 COREMAX BATTERY/inverters you may apply for a warranty extension during 12 months from the date of production from COREMAX by providing the serial number and copy of the warranty card of the unit. COREMAX 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, COREMAX 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:

Contact us

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


ADD: DuoCai Hi-Tech Park D 225 GuanLe Road 5 GuanLanHu Street, LongHua Shenzhen China

TEL: +86 (0755) 2100-2559

16S Lithium LiFepo4 100A 48v 51.2v solar energy storage paceic pace BMS


19″ rack mount LiFePo4 solar ESS 15S 16S 100A 200A Battery managment external BMS


20kw 50kwh lithium ion LiFePo4 battery bank three phase 380v AC off grid ESS


20kwh 30kwh lifepo4 compatible Cheap server rack for off grid solar batteries


220v/230v AC 5kw 48v 315 Ah LFP storage 16kwh lithium ion battery pack solar system kit


24v 3000W or 48v 5000W hybrid solar energy storage inverter pure sine wave


30 kwh CMX budget server rack battery 48v 5kwh lifepo4 wholesale


3000w 5000w 5500w solar pure sine wave Hybrid Energy Storage Inverter


30kwh 48v 600Ah Off grid Solar energy storage system kit


48v 1000ah Home Battery Home Solar lithium 50KWH battery Pack


48v 100Ah Server rack LiFePo4 battery Pack


48v 105Ah LiFePo4 Golf cart Battery Pack