CTEK SmartPass 120S – 12V Dual Battery Manager, AGM & Lead-Acid

Product Description

The CTEK SmartPass 120S is a professional 12V dual battery manager and automatic charger designed for AGM and lead-acid systems. It distributes up to 120A from your alternator or solar source between starter and service batteries — fully automatic, no manual switching. Ideal for Indian SUVs, commercial fleets, and overlanding builds across India's demanding roads and climates.

Features & Benefits

• 120A Output: Rapidly charges large service banks — perfect for heavy-duty Indian commercial vehicles and caravans.
• Priority Charging Logic: Starter battery fills first; surplus flows automatically to service battery — zero intervention needed.
• Multi-Chemistry Support: Works with lead-acid, AGM, EFB, and GEL — covers all types of charger needs across Indian vehicles.
• Wide Voltage Range (10.5–23V DC): Handles India's frequent voltage fluctuations, protecting your 12V battery charger investment.
• Temperature Resilience (–20°C to +50°C): Reliable from Rajasthan summers to Himalayan winters.
• Overcharge & Discharge Protection: Built-in safeguards extend battery life — exceptional long-term value for money.
• D250SA Compatible: Pairs with CTEK D250SA for a complete solar and automotive charger system for off-grid builds.

Detailed Specifications

How To Use

1. Mount the unit in a ventilated spot near your battery compartment.
2. Connect input terminals to your alternator or DC source (10.5–23V).
3. Wire output terminals to starter and service batteries respectively.
4. Power on — fully automatic 12V battery and charger operation begins immediately.

What's Included in the Box

• CTEK SmartPass 120S Unit
• Mounting hardware
• User manual

Comparison: CTEK SmartPass 120S – 12V Dual Battery Manager, AGM & Lead-Acid vs Generic Alternatives

Understanding the Technology

The SmartPass 120S uses DC-DC voltage-sensitive relay logic combined with priority-based current distribution, ensuring your 12V battery charger circuit never over-discharges the starter battery. Unlike basic isolators, it continuously monitors both battery banks and dynamically adjusts current flow. This makes it far more suitable than a standard automotive charger or relay switch for dual-battery setups in Indian diesel vehicles where def in diesel systems and accessory loads are common.

Warranty & Support in India

• Warranty: 2-year manufacturer warranty against manufacturing defects
• Customer Support: Monday–Saturday, 9 AM–6 PM IST. WhatsApp / Phone: +91 93112 11157 · hello@naredi.in
• Returns: 14-day return and exchange policy, COD returns accepted
• Delivery: Free delivery across India, Cash on Delivery available

Frequently Asked Questions

Is this compatible with Indian SUVs and diesel commercial vehicles?

Yes — it supports all 12V lead-acid and AGM batteries used in popular Indian SUVs and commercial fleets, including those with def in diesel systems.

Can I use Cash on Delivery (COD) to order?

Yes, COD is available across India with free delivery to all pin codes.

How do I claim warranty in India?

Contact our support team via WhatsApp / Phone: +91 93112 11157 or hello@naredi.in Monday–Saturday, 9 AM–6 PM IST.

Will India's voltage fluctuations damage this unit?

No — the wide 10.5–23V input range and built-in protection handle Indian power and alternator fluctuations safely.