Warranty Growatt WIT 4-15K-HU - exclusions and fault reporting
Warranty Growatt on the inverter WIT The 4-15K-HU includes a 5-year standard warranty and an optional 10-year warranty. Growatt does not cover 10 situations, including broken seals and transport damage. When reporting a fault, please have 6 pieces of information ready, including the serial number and error code.
Hybrid inverter Growatt WIT The 4-15K-HU arrives at the construction site with a clearly described service scope in Chapter 12 of the manual. This article summarizes in one place what the installer needs to know before removing the seal or calling for support. I'll show the warranty period, a complete list of exclusions, complete information for reporting a fault, and safe disassembly of the device. Growatt It only works when installed and operated in accordance with the manufacturer's instructions. Below, you'll also find battery voltage limits and photovoltaic limits, exceeding which voids the right to service.
How long is the warranty? Growatt na WIT 4-15K-HU?
The specifications table states "Warranty: 5 / 10 years - Yes/Opt." This means that 5 years is standard and 10 years is optional. This means that a longer period is not the default and must be purchased separately or registered according to the manufacturer's terms and conditions. PVGroup.pl European warranty applies Growatt, and its time range corresponds to the data from the catalog card.
Warranty Growatt provides repair or replacement of the defective product, as expressly stated by the manufacturer. The defective device should be returned to Growatt for recycling and disposal. The entire chain of custody begins with installation, so it's worth keeping the warranty card, date of purchase, and date of commissioning.
Note the difference between repair and replacement. Growatt The installer decides whether it's more cost-effective to repair or replace the entire device. For the installer, this means one thing: prepare the equipment so the service center can handle both scenarios without any dispute. An intact seal, complete documentation, and a clear description of the fault shorten the complaint processing time, as this determines how quickly the warranty will be effective. Growatt.
| Parameter | Value | Attention |
|---|---|---|
| Guarantee period | 5 years standard / 10 years optional | "Yes/Opt." entry in the card |
| Inverter weight | 43 kg | without packaging |
| Dimensions (W/H/D) | 475 / 698 / 240 mm | without packaging |
| Level of security | IP66K | indoor and outdoor installation |
| Battery voltage range | 40-60 V | recommended 51,2 V |
| PV string short circuit current | max. 50 A | on a chain |
| PV string open circuit voltage | max 1000 Vdc | on a chain |
| Discharge time to safe voltage | after disconnecting the power supply |
What is not covered by the warranty Growatt? 10 exclusions
The section on liability is most important for the installer. The manufacturer lists situations for which the manufacturer is not responsible. If a defect occurs due to one of these causes, the warranty Growatt ceases to apply, and repairs can be performed for a fee after diagnosis. The table below organizes the complete list so that nothing is missed on the construction site.
| Nr | Exclusion from warranty |
|---|---|
| 1 | Unauthorized disassembly of the product, including removal of the security seal and the top cover of the inverter |
| 2 | Damage caused during transport |
| 3 | Incorrect actions during installation and startup |
| 4 | Failure to follow assembly, operation and storage instructions |
| 5 | Unauthorized modifications or improper maintenance of the device |
| 6 | Improper use and handling |
| 7 | Damage due to storage conditions not in accordance with the instructions |
| 8 | Customer negligence and failure to comply with safety rules and legal regulations |
| 9 | Damage caused by force majeure, such as lightning, flood, storm, fire |
| 10 | Failure to turn off the PCS before updating the firmware - the device will turn itself off during the update and stop supplying power to the loads |
Seal and Top Cover - Most Common Reason for Rejection
The first exclusion is the most severe for the installer. Simply removing the security seal or the top cover of the inverter voids the warranty. Growatt expires. Installation and operation of the device should only be performed by qualified and trained electricians. Do not open the device interior without following the instructions, as this will invalidate your right to service.
Firmware and PCS shutdown
The tenth point concerns software updates, which is a condition on which the warranty also depends. GrowattBefore uploading the firmware, you must turn off the PCS (inverter converter system). Otherwise, the device will automatically shut down during the update and will not provide power to the loads. The update can be performed via USB, but remember that the system update will cause a power loss on the LOAD ports.
The seal and DC side also have their own records
Warranty Growatt It also does not cover damage from loose AC connectors. The manufacturer warns that damage resulting from failure to seal the output terminal gaps is outside the warranty. After completing the AC wiring, the silicone mat should be sealed with a fire-resistant silicone sealant to maintain a tight seal. On the photovoltaic side, strict limits apply: the short circuit current of each string cannot exceed 50 A, and the open circuit voltage of the string cannot exceed 1000 VDC. The manufacturer notes that it is not responsible for any consequences of violating these conditions. The total power of the panels should not exceed twice the input power of the inverter.
Battery Voltage and Storage Conditions – Two Silent Reasons for Rejection
Two exclusions from the list concern things that installers easily forget: battery selection and equipment storage. Both can void the warranty. Growatt will no longer apply, even though the inverter appears to be working. I'm discussing them separately because they occupy different pages in the documentation.
Stick to the battery voltage window
The inverter operates with a battery in the 40-60V range. The recommended value is 51,2V, which is the typical rated voltage of a sixteen-cell LiFePO4 battery. This leads to a simple conclusion for selection: the battery must fall within the 40-60V window, and the operating point should be close to 51,2V. Connecting a cell with a different rated voltage is a violation of the instructions, and the fourth point on the exclusion list explicitly covers failure to follow installation recommendations.
Store equipment according to instructions
The seventh exclusion concerns damage caused by improper storage. This is a common occurrence on construction sites, where the inverter sits for weeks in a damp box or in the freezing cold. The IP66 protection rating applies to the installed and sealed device, not to equipment in an open package. Until installation, store the inverter in the conditions described in the manual; otherwise, any traces of moisture or corrosion will be the fault of the installer, not the manufacturer.
What information should I prepare to report a fault?
A service request goes more smoothly when the installer has all the information at hand - this is how the warranty works in practice GrowattThe manufacturer requests that you complete a form prior to warranty repair, including the purchase and installation date, inverter serial number, and a description of the fault. You must have six pieces of information ready to contact technical support.
- Inverter model number WIT.
- Inverter serial number WIT.
- Inverter error code WIT.
- Information shown on the LED display.
- DC input voltage and AC output voltage of the inverter.
- Inverter communication method WIT.
You can read the error code and event description remotely in the app. On the "Events" screen in ShinePhone You'll see a fault message and suggested troubleshooting steps. It's a good idea to take a photo of the OLED screen with the code before resetting the device. The code table in the manual distinguishes between warnings and errors: a warning reduces output and disappears after a restart, while an error code indicates damage or incorrect configuration.
This distinction has practical implications when deciding whether to replace a device. If the message is a warning that disappears after a restart, the device usually does not require replacement. The manufacturer describes this condition as a power loss, not a hardware failure. The error code indicates damage or incorrect configuration, and its content is included in the service form. Before requesting a replacement, check which group the message belongs to, as some issues are resolved simply by restarting it.
The manufacturer's official service contact is: technical support page Growatt and the address service@growatt.com. In practice, in Poland, you file a claim through the distributor from whom you purchased the equipment, so please complete the required information immediately upon first contact.
How to safely disassemble an inverter? 9 steps
Many calls result in device replacement, so the installer must know the correct disassembly sequence. The decommissioning section lists nine steps in a strict sequence. The pause after disconnecting the power supply is crucial: wait at least 5 minutes before performing any work. The same discharge time to a safe voltage is described on the residual discharge label. Warranty coverage depends on following this sequence. Growatt, therefore skipping steps may result in a repair dispute.
- Disconnect the external AC circuit breaker and secure it against accidental activation.
- Set the DC disconnect switches to the OFF position.
- Turn off the switch on the battery side.
- Disconnect the master battery circuit breaker.
- Wait at least 5 minutes before continuing.
- Disconnect the AC output cables.
- Disconnect the DC input cables.
- Remove the inverter from the wall mount.
- Dispose of the device according to local regulations.
The order is not random: first disconnect the AC side, then the DC side and the battery, and only after a full discharge do you touch the terminals. Reversing the order can result in arcing and shock, and can also damage the device being serviced. Damage resulting from an incorrect disassembly is covered by the improper handling exclusion.
The same 5-minute rule applies to maintenance. Before cleaning the case, disconnect the AC and DC power and wait 5 minutes after turning off the system. The same rule applies when cleaning or replacing the fan: disconnect all power sources and wait at least 5 minutes for a full discharge. The inverter is heavy, weighing 43 kg, so the manufacturer requires two people to lift it. With dimensions of 475 x 698 x 240 mm, a two-person grip is also more convenient when mounting the device on a wall mount.
Warranty Growatt and certificates and connection procedure
Installers often need a list of standards for connection documentation. The data sheet lists the following network certificates and standards: IEC 61727, IEC 62116, IEC 61683, IEC 60068, EN 50549-10/1, VDE 4105, and NC RfG. For EMC, IEC/EN 61000-6-1/2/3/4, EN 55011, and EN 62920 are listed. Safety standards are IEC/EN 62109-1 and IEC/EN 62109-2.
Please enter these symbols into the application exactly as they appear in the document, without your own interpretations. Before working in the on-grid You must obtain consent from the local network operator. The connection procedure is performed by an installer authorized by the appropriate DSO. Warranty Growatt remains valid only when installed in accordance with the law and safety regulations, because negligence in this respect is an express exclusion.
The inverter supports the full range of the series from 4 kW to 15 kW in three-phase 380/400 V version. You can find the entire family of devices in the category 3-phase hybrid inverters, where you can compare power variants. You can find a model popular in home installations on the product card. Growatt WIT 6K-HU.
From the installer's practice
The following tips are based on real installations and are intended to protect your right to service. They don't contain numbers pretending to be manufacturer data—they're based on experience from the construction site.
- From practice: do not break the seal "just to test". Removing the seal or top cover is the quickest way to void the warranty Growatt stops working, and installers often do this in a rush to diagnose. Report the fault before opening the device.
- From practice: document transportation and unpacking. Shipping damage is unlikely, so inspect the box before unpacking and take photos. The manufacturer recommends reporting any visible damage to the shipping company immediately.
- In practice: always turn off PCS before updating. Updating firmware "live" results in a power outage and unnecessary notifications. Plan the update for when your customers may be without power.
- From practice: select the battery according to the inverter voltage window. A battery with a rated voltage outside the recommended operating point is a surefire path to starting problems and warranty disputes. Stick to the 40-60V window and the recommended 51,2V point.
- From practice: do not shorten the break to 5 minutes. Residual voltage remains after power is turned off, and hasty removal may result in electric shock. Wait a full 5 minutes before touching the terminals.
FAQ - Warranty Growatt WIT 4-15K-HU
How many years is the warranty? Growatt on this inverter?
The data sheet lists 5 years as standard and 10 years as an option, noted as "Yes/Opt." A longer period is not the default and requires separate coverage according to the manufacturer's terms and conditions.
Does removing the seal void the warranty?
Yes - unauthorized disassembly, including removing the security seal and top cover, is on the exclusion list. Only qualified electricians should service the interior of the device.
What information do I need to provide when reporting a fault?
The manufacturer requires six pieces of information: model, serial number, error code, LED display content, DC and AC voltage, and communication method. You must also include the purchase and installation date and a description of the fault with the repair form.
What to do before updating the software?
Turn off the PCS before updating the firmware, otherwise the inverter will shut down during the update and will not supply power to the load. The system update will cause a power outage on the LOAD ports.
What are the limits on the photovoltaic side?
The short circuit current of a single string must not exceed 50 A and the open circuit voltage must not exceed 1000 VDC. The total power of the panels must not exceed twice the input power of the inverter. Exceeding these limits excludes the manufacturer's liability.
Does the warning on the display indicate a failure?
Not always. The warning reduces output and usually disappears after a restart, while the error code indicates damage or misconfiguration. Before requesting a replacement, check which group the warning belongs to.
Installer's Checklist - Protecting Your Right to Service
This list shortens the path from fault to successful reporting and protects the validity of service coverage.
- Keep the seal and top cover intact until service diagnoses.
- Inspect the box and equipment upon delivery and document any transport damage.
- Store the inverter according to the instructions until installation, as poor conditions are an exception.
- Seal the AC terminals with fire retardant compound after wiring.
- Maintain PV limits: string short circuit current up to 50 A and open circuit voltage up to 1000 Vdc.
- Select a battery in the 40-60V window close to the 51,2V point.
- Before updating, turn off PCS and plan a power outage for the loads.
- Complete the 6 data points for reporting and take a photo of the screen with the error code.
- When disassembling, follow the 9-step sequence and take a 5-minute break.
- Lift a 43 kg device with two people.
Warranty Growatt na WIT The 4-15K-HU only works if installed and operated exactly according to the manufacturer's instructions. If you're assembling a kit for this inverter, check the offer. PVGroup.pl fitted battery kit for WIT 4-15K with a capacity of 15 kWhso that the entire installation works consistently from day one.
Sources
- Growatt WIT 4-15K - User Manual (HU) — user manual WIT 4-15K-HU (rev. 2025-11), chapter 10-12, PDF pp. 139-142 (print 135-138)
- Growatt WIT 4-15K - Catalog Card — catalog card WIT 4-15K