OptiMate Solar DUO 40W 6-step 12V / 12.8V 3.33A sealed solar panel, battery saving charger & maintainer

This unit includes a durable 40 W polycrystalline solar panel and a sealed, weatherproof smart controller that automatically adjusts to battery conditions. During daylight, it delivers an average of 3.33 A charging current with pulse bursts up to 5 A to quickly recover and charge batteries, even those as low as 4 V. At night, it enters a low-power monitoring mode, updating battery status every 3 seconds while drawing less than 0.5 mA.

The integrated 6-stage charging program includes Test, Save, Charge, Optimize, Maintain, and Monitor stages. The controller automatically switches between charging and monitoring, ensuring optimal battery health without overcharging. It works with both standard lead-acid (AGM, GEL, EFB) and lithium (LiFePO₄) batteries.

Specifications:

• Solar Panel: 40 W polycrystalline with outdoor-rated SAE cable and corner-mount brackets
  

• Max Charging Current: 3.33 A average, with 3–5 A pulses
  

• Battery Types: 12 V lead-acid (STD, AGM, GEL, EFB), 12.8 / 13.2 V LiFePO₄ (4S)
  

• Minimum Recovery Voltage: 4 V
  

• Charging Stages: 6 stages – Test, Save, Charge, Optimize, Maintain, Monitor
  

• Monitoring Mode: LED updates every 3 seconds, resumes charge automatically in sunlight
  

• Temperature Range: –20 °C to +40 °C
  

• Standby Power Draw: < 0.5 mA
  

• Cable Length from Panel to Controller: ~124″ (315 cm)
  

• Enclosure Rating: IP54 weatherproof
  

• Included Accessories: 40 W panel, smart controller, 2 m battery lead, battery clips, mounting brackets
  

• Panel Dimensions: Approx. 680 × 420 × 30 mm
  

The OptiMate Solar DUO TM‑522‑D4 offers powerful, intelligent charging with reliable performance in all weather conditions, making it a dependable solution for maintaining batteries off the grid.

• Datasheet