800W 25A MPPT Solar Charging Module – DC 18–90V Step-Down
800W 25A MPPT Solar Charging Module – DC 18–90V Step-Down
800W 25A MPPT Solar Charging Module – Adjustable Step-Down Regulated Board
Maximize your solar energy harvest with the Gaqqee 800W 25A MPPT Solar Charging Module. Designed for a wide range of solar setups, this compact yet powerful DC-DC step-down controller accepts input from DC 18–90V and delivers a fully adjustable output of DC 2–60V at up to 25A. Whether you're charging 12V, 24V, or 48V battery banks — or driving DC loads directly — this module offers intelligent, unattended operation for off-grid and renewable energy systems.
Key Features
- Wide Voltage Compatibility: Input range of DC 18–90V and output range of DC 2–60V supports a broad variety of solar panels for versatile deployment.
- High Power Capacity: Compatible with 5W–800W solar panels to suit diverse energy requirements from small setups to larger installations.
- Built-In Backfeed Protection: Integrated high-current ideal diode prevents reverse current flow, making it safe for direct battery charging without additional components.
- Ultra-Low Standby Consumption: Daytime standby draws only ~0.9W; at night, automatic backflow prevention ensures zero power draw.
- All-Weather Charging: Continues to charge on cloudy or overcast days and automatically stops when the battery is fully charged — no manual intervention needed.
- DC-DC Regulated Output: Can also function as a step-down, regulated, adjustable power supply to drive DC loads directly.
- Automatic Temperature-Controlled Fan Cooling: Onboard fan activates based on temperature to keep the module running efficiently and reliably.
- Lithium-Ion Ready: No activation required for lithium-ion battery charging; fully automatic operation from connection to full charge.
Specifications
| Input Voltage | DC 18–90V |
| Output Voltage | DC 2–60V (adjustable) |
| Output Current | 0–25A (adjustable) |
| Max Power | 800W |
| Standby Power | ~0.9W (daytime); 0W (nighttime) |
| Compatible Panel Range | 5W–800W |
| Cooling | Automatic temperature-controlled fan |
| Protection | Output backfeed protection, built-in ideal diode |
| Quantity | 1 Module |
| Country of Origin | Made in China |
Commissioning Guide
- Connect PV Input: Connect your 16V–80V solar panel to the input (verify correct polarity and do not exceed the maximum input voltage). The power indicator light will illuminate if the connection is correct.
- Enable Output: If the output indicator is not lit, turn the MPPT potentiometer counterclockwise until output voltage appears and the output indicator illuminates.
- Set Output Voltage: Adjust to 14.2V for a 12V battery, 28.4V for a 24V battery, or 56V for a 48V battery.
- Tune MPPT Voltage: Connect the battery and use a multimeter to monitor input voltage. Adjust the MPPT potentiometer so the input voltage matches your panel's maximum power point voltage (e.g., ~18V for an 18V panel, ~36V for a 36V panel). Refer to the label on the back of your specific panel for rated values.
Recommended starting settings: Output voltage = 14.2V, Output current = 20A, MPPT voltage = 17V.
Package Contents
- MPPT Solar Charging Module × 1
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Frequently Asked Questions
Q: What battery types can the 800W 25A MPPT Solar Charging Module charge?
A: This MPPT solar charging module supports lithium-ion batteries (no activation required), as well as standard 12V, 24V, and 48V lead-acid or other DC battery banks. Simply set the output voltage to the appropriate charging voltage (14.2V for 12V, 28.4V for 24V, 56V for 48V) and connect — the module handles the rest automatically.
Q: Can this module work on cloudy days or in low-light conditions?
A: Yes. The Gaqqee MPPT charging module is designed to continue charging in overcast, cloudy, or rainy conditions. It will automatically stop charging once the battery reaches full capacity and prevent backflow at night, ensuring zero unnecessary power drain.
Q: What is the difference between using this as an MPPT charger versus a step-down regulated power supply?
A: In MPPT charging mode, the module tracks the solar panel's maximum power point voltage to extract the most energy possible for battery charging. In step-down regulated mode, the module outputs a stable, adjustable DC voltage (2–60V) that can directly power DC loads — making it a dual-function module suitable for both charging and general power regulation tasks.
Q: How do I know if my solar panel is compatible with this module?
A: The module accepts solar panels with an open-circuit voltage between 18V and 90V, covering panel wattages from 5W to 800W. Check your panel's open-circuit voltage (Voc) on its specification label. For 12V battery charging, use panels with a Voc above 18V; for 24V battery charging, use panels with a Voc above 30V. Always ensure correct polarity before connecting.
Production & Packaging Notice
To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.