Freematics MPPT 400/55 Charge Controller is a weather-proof MPPT (maximum power point tracking) charge controller that adapts any solar panels (up to 55V) to any types of batteries (8.4-30V) at an optimum charging performance. Being able to work standalone or in parallel, it is also adaptive to all kinds of scenarios whether for a caravan, a shed, any solar powered facilities, or a large-scale off-grid system.

Feature Highlights

Outstanding MPPT performance and DC-DC conversion efficiency
Galvanized steel enclosure with passive cooling design
IP66 waterproof, dust-proof, vibration-proof
Live display of input/output voltage and current
Supporting solar panels with open-circuit voltage up to 55V
Universal battery support (8.4-30V, any types)
Over-heating protection and short-circuit protection
Works as solar charge controller or DC-DC charge controller

Quick Guides

Standalone Mode

In standalone mode, the input of charge controller is connected to one or several solar panels and the output connected to battery. The charger controller is able to output up to 400W power regardless of total capacity of connected solar panels. Since solar panels rarely work at their maximum rating, it is common and safe to connect higher capacity of solar panels to the charge controller to achieve best performance and cost-effectiveness.

Step 1 – Connecting solar panels

Connect the output of solar panel (normally in MC4 connectors) to the input of the controller (also available with MC4 connectors). To connect multiple solar panels, use MC4 splitters to join multiple pairs of MC4 connectors into one and connect to the charge controller. Be very aware to connect +/- correctly.

Step 2 – Adjusting output voltage

If solar panel outputs enough voltage, the digits on charge controller will light up. Press +/- buttons to adjust the output voltage to the fully charged voltage of the battery and then press OK button to store the value.

Step 3 – Connecting batteries

Connect the +/- of battery to the charge controller and it’s done. Be very aware to connect +/- correctly.

Parallel Mode

In parallel mode, each group of solar panels are connected to one charge controller. Output of all charge controllers are connected to the same battery. This allow each group of solar panels to work at their own maximum power point and achieve higher overall efficiency than a single controller.

Step 1 – Connecting solar panels

Connect the output of each group of solar panel(s) to one charge controller. Be very aware to connect +/- correctly.

Step 2 – Adjusting output voltage

Press +/- buttons to adjust the output voltage of each charge controller to the fully charged voltage of the battery and then press OK button to store the value.

Step 3 – Connecting batteries

Connect the battery +/- lines of each charge controller to the same battery. Be very aware to connect +/- correctly.

Note: Parallel connection with charge controllers of other brands is not guaranteed to work.

Specifications

Supported Batteries

Input Solar Panel Open-circuit Voltage

Maximum Power Point Voltage

Maximum Output Power

Maximum Output Current

Idle Overhead

MPPT Conversion Rate

Output Short-circuit Protection

Output Reverse Connection Protection

Output Under-Voltage Protection

Over-Current Protection

Over-Heating Protection

Waterproof Rating

Working Temperature

Enclosure Dimensions

Weight

Any types (lithium, lipo, gel, lead acid) with a full charge voltage between 8.4V and 30V

21V-55V

17V-55V

400W

15A

0.35W

99%

Yes

IP66

-40-65°C

120x80x40mm

490g

Warranty

This product comes with one-year replacement warranty. Please be cautious reversed connection of input could damage the product and will void the warranty.

Freematics MPPT 400/55 Charge Controller