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AMP-TECH AT121000DSP 120Ah AGM Battery + THUNDER TDR02020 20A DC-DC Charger Bundle Kit
Complete dual battery system bundle featuring Amp-Tech AT121000DSP 120Ah VRLA/AGM Plus deep cycle battery with 800 CCA, Thunder TDR02020 20A DC-DC battery charger with integrated MPPT solar regulator supporting up to 25A solar input, multi-stage smart charging algorithm (Boost, Absorption, Float, Equalize), Bluetooth connectivity via Thunder Connect app, IP67 waterproof rating, temperature compensation, wide input voltage range 9-32V DC for smart alternator compatibility, supports AGM/Gel/Flooded/Calcium/Lithium batteries, comprehensive protection features, maintenance-free sealed construction, low self-discharge rate, exceptional deep discharge recovery, and professional component matching for 4WD vehicles, caravans, motorhomes, work vehicles, and off-grid power systems.
Product Overview
The AMP-TECH AT121000DSP + THUNDER TDR02020 Bundle provides professionally matched dual battery system components eliminating compatibility concerns for auxiliary power installations. The Amp-Tech 120Ah AGM battery delivers reliable deep cycle performance with 800 CCA starting capability and exceptional cycle life, while Thunder's intelligent 20A DC-DC charger with integrated MPPT solar controller ensures optimal charging from vehicle alternator and solar panels simultaneously. This complete package suits 4WD adventurers requiring refrigeration and camping equipment power, caravan owners needing extended off-grid capability, work vehicle operators running tools and equipment, and mobile setups demanding sustainable auxiliary power without compromising starting battery integrity through smart alternator-compatible charging technology.
Important Notes:
Installation Requirements: Minimum 80A alternator recommended for optimal charging performance. Requires appropriate battery tray, hold-down system, and secure mounting location with adequate ventilation for both components. Professional installation recommended for complex electrical systems.
Solar Panel NOT Included: Bundle includes battery and DC-DC charger with MPPT solar capability but solar panels must be purchased separately. Thunder TDR02020 accepts 12-23V solar input with maximum 25A current (typically 250-350W panels).
Starting Battery Separate: This bundle provides auxiliary/secondary battery system components. Vehicle starting battery remains separate and independent. DC-DC charger connects between starting battery and auxiliary battery for isolated charging.
Fusing Required: Install appropriate fusing/circuit breakers on all main power connections. Minimum 30A fuse on input from starting battery and 30-40A fuse on output to auxiliary battery. Solar input requires 30A inline fuse.
Alternator Compatibility: Thunder TDR02020 designed for modern smart alternators with variable voltage output (9-32V DC input range). Verify alternator capacity before installation as undersized alternators may not provide sufficient charging current.
What's Included
- 1x Amp-Tech AT121000DSP 120Ah VRLA/AGM Plus Deep Cycle Battery
- 1x Thunder TDR02020 20A DC-DC Battery Charger with MPPT Solar Regulator
Technical Specifications
Amp-Tech AT121000DSP Battery Specifications
| Specification | Details |
|---|---|
| Model | AT121000DSP |
| Nominal Voltage | 12V |
| Capacity (20HR) | 120Ah |
| Cold Cranking Amps (CCA) | 800A |
| Reserve Capacity (RC) | 200 minutes |
| Battery Chemistry | VRLA/AGM Plus Deep Cycle |
| Terminal Type | Dual M8 threaded stud terminals |
| Dimensions (L x W x H) | 330mm x 173mm x 220mm |
| Weight | Approximately 32kg |
| Operating Temperature | -20°C to +50°C |
| Self-Discharge Rate | <3% per month at 25°C |
| Cycle Life | 400+ cycles at 50% DOD |
| Internal Resistance | Low resistance for efficient power delivery |
| Construction | Sealed, spill-proof, vibration-resistant |
| Maintenance | Maintenance-free (no water topping required) |
| Mounting Position | Any position (sealed design) |
Thunder TDR02020 DC-DC Charger Specifications
| Specification | Details |
|---|---|
| Model | TDR02020 |
| Maximum Charging Output | 20A DC |
| Input Voltage Range | 9-32V DC (smart alternator compatible) |
| Solar Input Voltage | 12-23V |
| Maximum Solar Input Current | 25A (typically 250-350W panels) |
| MPPT Efficiency | Up to 98% conversion efficiency |
| Charging Algorithm | Multi-stage (Boost, Absorption, Float, Equalize) |
| Battery Types Supported | AGM, Gel, Flooded, Calcium, Lithium (LiFePO4) |
| Temperature Compensation | Yes (automatic voltage adjustment) |
| Protection Features | Over-voltage, Under-voltage, Reverse polarity, Over-temperature, Short circuit, Overload protection |
| Operating Temperature | -20°C to +60°C |
| Ingress Protection | IP67 (dust-tight and waterproof) |
| Dimensions (L x W x H) | 190mm x 110mm x 50mm |
| Weight | 0.9kg |
| Connectivity | Bluetooth (Thunder Connect App for iOS/Android) |
| Mounting | Bracket mount with heat dissipation |
| Cable Connections | Screw terminals for secure wiring |
| Warranty | 2 years manufacturer warranty |
Frequently Asked Questions
Can I use this bundle with my vehicle's smart alternator?
Yes, the Thunder TDR02020 is specifically engineered for modern vehicles with variable voltage smart alternators. The wide 9-32V DC input range accommodates voltage fluctuations from smart alternator systems found in Euro 5/6 vehicles, ensuring consistent 20A charging output regardless of alternator voltage variations. The charger regulates input voltage and delivers optimal multi-stage charging to the Amp-Tech battery, making this bundle ideal for late-model 4WDs, commercial vehicles, and modern caravans with intelligent charging systems.
How much solar panel capacity can I connect to the Thunder charger?
The Thunder TDR02020 accepts up to 25A solar input with 12-23V panel voltage, typically supporting 250-350W solar panel capacity depending on panel efficiency and local conditions. For the 120Ah Amp-Tech battery, 100-200W solar panels provide excellent charging performance for typical camping and off-grid applications. The integrated MPPT controller extracts maximum available power from panels, delivering up to 30% more charging efficiency compared to PWM controllers, particularly beneficial in variable light conditions or partial shading scenarios.
What size cables and fuses do I need for installation?
Use minimum 6mm² (10AWG) cable for main power connections between charger and batteries to safely handle 20A charging current. Install 30A fuse or circuit breaker on input from starting battery, 30-40A fuse on output to auxiliary Amp-Tech battery, and 30A inline fuse near solar panel connection. Use 4mm² minimum for solar panel cables. Ensure all positive connections are fused within 300mm of battery terminals. Quality marine-grade tinned copper cable recommended for corrosion resistance in Australian conditions.
Will this keep my auxiliary battery charged when parked for weeks?
With adequate solar panel capacity (100W minimum recommended), the system maintains battery charge indefinitely when vehicle parked, even with moderate loads like camping fridges and LED lighting. Without solar panels, the Amp-Tech battery's low <3% monthly self-discharge rate means minimal charge loss during extended storage periods. For maximum battery lifespan during long-term storage (3+ months), store battery fully charged and consider periodic charging. The Thunder charger's float stage prevents overcharging while maintaining optimal voltage during extended solar charging.
Can I install this system myself or do I need professional installation?
Competent DIY installers with basic automotive electrical knowledge can install this system following proper safety procedures and manufacturer instructions. Installation requires battery tray mounting, secure DC-DC charger installation with adequate ventilation, appropriate gauge cabling, correct fusing/circuit breaker placement, and proper terminal connections. However, if unfamiliar with vehicle electrical systems, smart alternator configurations, or Australian Standards AS 3000 wiring requirements, professional installation strongly recommended to ensure system safety, optimal performance, warranty compliance, and insurance coverage validity. Professional installers can also configure Thunder app settings for specific battery type and usage patterns.
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