X3-FTH-100K-5anni
+5 Year Warranty Extension for the commercial three-phase inverter Solax X3-Forth 100 kW (X3-FTH-100K). Added to the standard warranty, it brings the total coverage to 10 years from commissioning. Includes unit replacement, original Solax spare parts, remote diagnostics, and official technical support.
+5 year warranty extension for the commercial three-phase inverter Solax X3-Forth 100 kW (X3-FTH-100K). By adding this package to the manufacturer's standard warranty, the total inverter coverage reaches 10 years from the commissioning date, aligning with the typical payback period of a commercial or industrial photovoltaic system.
What the warranty extension includes
The X3-FTH-100K-5anni package extends the Solax limited warranty terms on the X3-Forth 100 kW inverter by 5 years. The coverage includes:
- Unit replacement in case of a warranty-covered failure (material or workmanship defects)
- Supply of original Solax spare parts
- Remote diagnosis and technical support via the Solax EU team (service.eu@solaxpower.com)
- Transfer of remaining warranty to the replacement product (for remaining warranties under 1 year, the term is automatically extended to 12 months)
Excluded are inbound/outbound transport costs, labor for replacement/on-site assistance, and damage caused by non-compliant installation, external overvoltages, exceptional weather events, unauthorized modifications, and third-party parts installed on the inverter.
Standard X3-Forth warranty and total duration
| Solax X3-Forth standard product warranty | 5 years |
| +1 year spare parts bonus (if inverter is registered and connected to SolaxCloud) | optional |
| Extension purchased with this package | +5 years |
| Total coverage duration | up to 10 years from commissioning |
Target inverter
| Model | Solax X3-Forth (code X3-FTH) |
| Nominal power | 100 kW |
| Type | Three-phase string inverter, commercial and industrial (C&I) |
| X3-Forth series power range | 75 / 80 / 100 / 110 / 120 / 125 / 136 / 150 kW |
| Main features | Efficiency up to 99%, 12 MPPT, 150% PV oversizing, IP66, integrated export control |
When is it worth buying the extension?
For a 100 kW C&I inverter, the warranty extension almost always makes sense, for three reasons:
- Protection of the payback plan: a ~100 kW system is typically amortized in 7-10 years; extending the warranty to 10 years covers the entire payback period
- Replacement cost out of warranty: the value of an X3-Forth 100 kW far exceeds the cost of the extension, and in case of an uncovered failure, the owner bears the full replacement cost
- Transparent up-sell to the end customer: for installers offering turnkey systems, including the extension in the proposal is a strong selling point and a reputational safeguard
How to activate the extension
- The X3-FTH-100K inverter must have been installed and commissioned by a certified Solax installer
- The inverter must be registered on the SolaxCloud portal with correct site and owner data
- The extension must be purchased within the time window set by Solax policy (check the Warranty Terms & Conditions in force at the time of activation)
- After purchase, MR WATT registers the extension with Solax and provides the personalized warranty extension certificate
Frequently Asked Questions
For which inverter is this warranty extension valid?
Exclusively for the commercial three-phase inverter Solax X3-Forth 100 kW (code X3-FTH-100K). For other power sizes in the X3-Forth series (80, 110, 120, 125 kW), dedicated packages with different prices are available, indexed to the inverter's nominal power.
What is the total warranty duration with this package?
The standard Solax X3-Forth warranty is 5 years from the commissioning date. With this package, you add +5 years, bringing the total coverage to 10 years. If the inverter is registered and connected to SolaxCloud, Solax grants an additional free year on spare parts.
Is the 5-year or 10-year package better?
The +5 year package (this product, total warranty 10 years) is the right choice if the system's operating horizon is about 10 years or if the cost/benefit analysis favors a shorter extension. The +10 year package (X3-FTH-100K-10anni, total warranty 15 years) is recommended for commercial systems that will remain operational beyond 10 years.
Does the extension also cover accidental damage or overvoltages?
No. The extension covers material and workmanship defects, in line with Solax's limited Warranty Terms & Conditions. Excluded: lightning damage, external overvoltages not managed by installed SPDs, exceptional weather events, non-compliant installation, unauthorized modifications, tampering, and failures caused by third-party components. To cover these risks, a separate all-risk policy is required.
Can I purchase the extension even a few years after installation?
Solax provides a specific time window within which it is possible to purchase the warranty extension. In general, it is preferable to purchase the extension at the same time or immediately after installation. For checks on a specific case, contact MR WATT support with the inverter's registration number and commissioning date.
What is included and what is excluded from the coverage?
Included: replacement of the unit for covered defects, supply of original Solax spare parts, remote diagnosis and technical support, transfer of remaining warranty to the replacement product. Excluded: inbound/outbound transport costs, labor for replacement and on-site assistance, external damages not covered, third-party parts installed on the inverter. For full details, refer to the official "Solax Warranty Terms & Conditions" document.
