OptiMate Solar DUO 10W Solar Panel, 6-step 12V / 12.8V 0.83A sealed solar charger & maintainer

The OptiMate Solar DUO TM‑522‑D1 is a 24/7 solar-powered charge controller and battery monitor designed for 12 V lead‑acid and 12.8 V LiFePO₄ batteries. Ideal for outdoor vehicles, boats, cabins, and remote battery systems, it delivers fully automatic, solar-powered maintenance without user intervention 

By day it charges using a polycrystalline solar panel, supplying up to 0.83 A average with 3–5 A pulse bursts (for the 10 W panel included). When sunlight fades, it switches to monitor mode to periodically display the battery’s state of charge and prevent over-discharge. It works with flooded, AGM, GEL, EFB lead‑acid batteries and 4-cell LiFePO₄ packs, reviving batteries from as low as 4 V 

This system includes a weatherproof controller that can be mounted near the battery and a rugged 10 W solar panel tailored to withstand outdoor conditions. It features spark-free design, polarity protection, low standby current (<0.5 mA), and auto shut-off on fault or disconnect 

• Solar Panel Output: 10 W polycrystalline
  
• Max Charge Current: ~0.83 A continuous; 3–5 A pulses
  
• Battery Compatibility: 12 V lead-acid (flooded, AGM, GEL, EFB), 12.8 V LiFePO₄ (4s)
  
• Recovery Threshold: From 4 V
  
• Charging Stages: 6‑step solar DUO program — Pulse/Bulk, Optimize, Charge, Monitor
  
• Monitoring Interval: Battery state displayed every 3 s in night mode
  
• Operating Temperature: Down to –20 °C (–4 °F)
  
• Standby Power: <0.5 mA draw
  
• Max Array Voltage Input: ~15–22 V
  
• Cables: 2 m DC lead with SAE connector and battery clip or fused ring terminal lead; panel includes 4‑point mountable frame
  
• Protection: Spark suppression, reverse polarity protection, automatic fault shut‑off
  
• Enclosure: Weatherproof controller housing; outdoor-rated solar panel
  

• Datasheet

• Trickle Charger vs Regular Charger: What’s the Real Difference?
• A Guide to Choosing the Right Battery Charger