Official Warranty Policy & Terms
Every genuine Kenson, Howa Power, and G-Mac product supplied by TNS Engineering Ltd. in Bangladesh is backed by an authentic replacement warranty and dedicated engineering service.
Standard Product Warranty Schedule
Validated from the original date of purchase across all authorized dealers and corporate projects in Bangladesh.
| Product Category | Model / Range | Warranty Period | Coverage Type | Conditions |
|---|---|---|---|---|
| Kenson SMF Batteries (Small) | 4V 4.5Ah, 6V 4.5Ah, 12V 5Ah | 3 Months | Full Replacement Warranty | Manufacturing defect, cell short-circuit, or open-circuit under standard operating conditions. |
| Kenson SMF Batteries (Medium) | 12V 7.5Ah, 12V 8.2Ah, 12V 9Ah, 12V 12Ah, 12V 18Ah, 12V 26Ah | 6 Months | Full Replacement Warranty | Capacity failure or physical leak under recommended float charging voltage (13.6V–13.8V). |
| Kenson SMF Deep Cycle Batteries (Large) | 12V 40Ah, 12V 65Ah, 12V 70Ah, 12V 80Ah, 12V 100Ah, 12V 120Ah, 12V 150Ah, 12V 200Ah | 12 Months | Full Replacement Warranty | Manufacturing defect or internal breakdown under proper deep-cycle solar/IPS application. |
| Kenson Pure Sine Wave IPS (Home & SOHO) | LX-0612 (600VA), LX-0812 (800VA), LX-1012 (1000VA), LX-1524 (1500VA), LX-2024 (2000VA) | 18 Months | Full System Warranty | Pure copper transformer, motherboard control, and automatic transfer switch coverage. |
| Industrial Pure Sine Wave IPS | LX-5048 (5kVA), LX-10K48 (10kVA), LX-15K192 (15kVA), LX-20K192 (20kVA), LX-30K192 (30kVA) | 18 Months | Industrial Project Warranty | On-site engineering inspection, parts replacement, and annual maintenance contract support. |
| Howa Power Servo Voltage Stabilizers (AVR) | Single-phase & Three-phase (650VA to 5000kVA) | 12 Months | Parts & Service Warranty | Servo motor, carbon brush assembly, toroidal transformer, and automatic voltage regulation board. |
| G-Mac Germany Low-Frequency Online UPS | 1kVA to 600kVA Industrial Galvanic Isolation | 12–24 Months | Industrial System Warranty | Galvanic isolation transformer, IGBT inverter stage, and static bypass switch. |
| LiFePO4 Lithium Energy Storage & BESS | 12.8V, 25.6V, 51.2V (100Ah to 300Ah) | 36–60 Months | Manufacturer Limited Warranty | Smart BMS, 6000+ cycle life to 80% DoD, thermal management, and cell voltage balancing. |
How to Claim Your Warranty
Our streamlined 3-step verification process guarantees minimum downtime and swift turnaround for mission-critical operations.
Verify Serial Number & Purchase Invoice
Locate the genuine serial barcode and warranty validation card on your unit. Ensure the original purchase receipt from TNS Engineering or an authorized dealer is available.
Diagnostic Inspection
Bring the unit to our Central Service Hub in Dhaka or any authorized regional service outlet. For high-capacity industrial equipment (above 5kVA), our certified engineers will schedule on-site diagnostics.
Rapid Repair or Replacement
Approved battery replacements are fulfilled immediately from inventory. Electronic equipment repairs are completed within 48 to 72 hours using genuine factory components.
24/7 Central Service & Emergency Hotline
Our engineering team is standing by to verify serial numbers, troubleshoot inverter fault codes, and dispatch replacement units nationwide.