OptiMATE Solar DUO 20W 6-step 12V / 12.8V 1.67A sealed solar panel and battery saving charger & maintainer

The OptiMate Solar DUO TM‑522‑D2 is a professional-grade, fully automatic 24/7 solar charge controller and battery maintainer designed for outdoor battery systems. It integrates a 20 W polycrystalline solar panel with a rugged, weatherproof smart controller. Ideal for maintaining 12 V lead‑acid (flooded, AGM, GEL, EFB) and 12.8 V lithium‑iron‑phosphate (4s LiFePO₄) batteries on motorcycles, boats, cabins, trailers, and remote systems.

By day, it delivers up to 1.67 A continuous (plus 3–5 A pulse bursts) to maintain or charge batteries from weak states (as low as 4 V). At night or in low light, it switches to smart monitoring, displaying battery status every few seconds and ensuring protection without over-discharge, with standby power under 0.5 mA. The intelligent six-step cycle includes low-voltage recovery, charging, optimization, maintenance, and continuous monitoring.

Built for durability, the controller and panel are rated IP54, operate from –20 °C up to +40 °C, resist sparks, manage reverse polarity, and shut off automatically if a fault occurs. The solar panel includes a 2 m cable and mounting brackets; the controller features a 2 m SAE-equipped cable and includes fused ring terminals and clamp leads. Up to 240 Ah lead-acid or 80 Ah LiFePO₄ batteries can be maintained continuously. The system has a three-year limited warranty.

• Solar Panel Power: 20 W polycrystalline
  
• Max Charge Current: 1.67 A continuous; 3–5 A pulse bursts
  
• Battery Compatibility: 12 V lead-acid (STD, AGM, GEL, EFB); 12.8 V LiFePO₄ (4s)
  
• Recovery Start Voltage: From 4 V
  
• Charging Program: 6‑step solar DUO cycle (Pulse/Bulk, Optimize, Charge, Maintain, Monitor)
  
• Smart Monitoring: Updates battery status every few seconds at night
  
• Operating Temperature: –20 °C to +40 °C
  
• Standby Drain: <0.5 mA
  
• Solar Panel Output Cable: 2 m with SAE connector
  
• Controller Cable & Leads: 2 m DC lead + fused ring terminals and standard clamps
  
• Battery Capacity Range: Up to 240 Ah (lead-acid); ~80 Ah (LiFePO₄)
  
• Enclosure Protection: IP54 weatherproof
  
• Safety Features: Spark suppression, reverse polarity protection, automatic fault shutoff
  

• Datasheet

• Trickle Charger vs Regular Charger: What’s the Real Difference?
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