SRNE ML4860N15 MPPT Solar Charge Controller User Manual

1. Introduction

The SRNE ML4860N15 is an advanced Maximum Power Point Tracking (MPPT) solar charge controller designed for efficient charging and discharging in solar power systems. It supports various battery types and system voltages (12V, 24V, 36V, 48V), offering high tracking efficiency and integrated features for ease of use. This manual provides essential information for the safe and effective installation, operation, and maintenance of your solar charge controller.

Front view of the SRNE ML4860N15 MPPT Solar Charge Controller

2. Safety Information

Please read all safety instructions carefully before installation and operation. Failure to follow these instructions may result in electric shock, fire, or serious injury.

Ensure all wiring is performed by qualified personnel.
Disconnect all power sources (solar panels and battery) before installing or servicing the controller.
Use appropriate tools and personal protective equipment.
Do not expose the controller to rain, moisture, or direct sunlight for prolonged periods unless specified for outdoor use.
Ensure proper ventilation around the controller to prevent overheating.
Verify correct polarity for all connections to avoid damage to the controller and other components.

3. Product Overview

3.1 Key Features

MPPT tracking efficiency up to 99.9% for optimal power harvest.
Supports multiple battery types: Lead-acid, Li-ion, and user-defined settings.
Allows simultaneous connection of PV (photovoltaic) and battery to supply DC loads.
Highly integrated design to save installation space and simplify wiring.
Supports various communication modes including RS232 and RS485.

3.2 Components

The controller features a robust design with clearly labeled terminals for easy connection. The front panel includes a display and control buttons for configuration and monitoring.

Bottom view of the SRNE ML4860N15 showing connection terminals for Battery Sampling Temp, PV+, PV-, BAT-, LOAD-, BAT+, LOAD+, RS485, RS232.

SRNE ML4860N15 controller with packaging and manual — SRNE ML4860N15 controller with packaging and included manual.

4. Specifications

Category	Parameter	Value
MODEL	Model Number	ML4860N15
	Type	MPPT
	Application	Charger Controller, Solar System Controller, Solar Charge Controller
	Product Name	solar charge controller
	Work Time (h)	24 Hours
PV INPUT	Max. Voltage of Open Circuit	145Vdc
	MPPT Voltage Range	(Battery voltage+2V)～120V
	Max. PV Input Power	800W/12V, 1600W/24V, 2400W/36V, 3200W/48V
BATTERY	Battery Type	Lead-acid / Li-ion / User Defined
	Rated Battery Voltage	12/24/36/48Vdc
	Battery Voltage Range	9~65Vdc
	Rated Charging Current	60A
	MPPT Charging Mode	Buck
LOAD	Load Type	Resistive load, Capacitive load, Inductive load
	Rated Load Voltage	Equal to battery voltage 12/24/36/48V
	Rated Load Current	20A
	Load Working Mode	Light control, Light control+Time control, Manual control (default), Debugging mode, Normal open
EFFICIENCY	MPPT Tracking Efficiency	>99%
EFFICIENCY	Max. Charging Conversion Efficiency	≤98%
ACCESSORIES	Standard	BTS temperature sensor, 3 pole communication cable
ACCESSORIES	Optional	RM-5 display, BT-1 Bluetooth module, USB to RS232 connection cable, GP-2 IoT module, 6 pole communication cable
GENERAL	Communication	RS232/RS485
	Weight	3.6kg (7.94lb)
	Dimension	28520593mm (0.940.670.31ft)
	Protection Degree	IP32
	Operating Temperature Range	-35℃~45℃ (-31F~113°F)
	Certificate	CE-LVD/RoHS/CE-EMC

5. Setup Instructions

Follow these steps for proper installation of the SRNE ML4860N15 solar charge controller. Ensure all safety precautions are observed.

Mounting: Choose a suitable location for mounting the controller. It should be in a dry, well-ventilated area, protected from direct sunlight and moisture. Ensure there is enough space around the controller for heat dissipation.
Wiring Sequence: Connect the components in the following order to prevent damage:

Battery Connection: Connect the battery to the 'BAT+' and 'BAT-' terminals on the controller. Ensure correct polarity. The controller will automatically detect the system voltage (12V/24V/36V/48V).
Load Connection: Connect the DC load to the 'LOAD+' and 'LOAD-' terminals. Ensure correct polarity.
PV Array Connection: Connect the solar panel array to the 'PV+' and 'PV-' terminals. Ensure correct polarity and that the open circuit voltage of the PV array does not exceed 145Vdc.
Temperature Sensor (BTS): Connect the included BTS temperature sensor to the designated 'Battery Sampling Temp' terminals. This is crucial for accurate battery charging compensation.
Communication Cables: If using optional communication modules (RS232/RS485), connect them to the respective ports.

Verification: After all connections are made, double-check all wiring for correct polarity and secure connections.

Important: Always connect the battery first and disconnect the battery last when working with the controller.

6. Operating Instructions

Once installed, the controller will automatically begin charging the battery from the solar array. You can monitor the system status and adjust settings via the integrated display and buttons, or through optional communication modules.

6.1 Initial Power-Up

Upon connecting the battery, the controller will power on and display system information. It will automatically detect the battery voltage and begin the charging process if solar power is available.

6.2 Load Working Modes

The controller supports several load working modes:

Manual Control (Default): The load can be turned on or off manually via the controller's buttons.
Light Control: The load automatically turns on at dusk and off at dawn.
Light Control + Time Control: The load turns on at dusk and stays on for a set duration.
Debugging Mode: Used for testing and troubleshooting.
Normal Open: The load is continuously on.

Refer to the controller's display interface and button functions for detailed instructions on how to switch between these modes and configure specific parameters.

6.3 Battery Type Selection

The controller allows selection of different battery types (Lead-acid, Li-ion, User Defined). Ensure the correct battery type is selected in the settings to optimize charging and prolong battery life. Incorrect settings can damage the battery.

7. Maintenance

Regular maintenance ensures the longevity and optimal performance of your solar charge controller.

Cleaning: Periodically clean the controller's exterior with a dry cloth. Ensure ventilation openings are free from dust and debris.
Connections: Annually check all wiring connections for tightness and corrosion. Re-tighten if necessary.
Environment: Ensure the operating environment remains within the specified temperature range (-35℃~45℃) and is free from excessive moisture.
Firmware: Check the manufacturer's website for any available firmware updates.

8. Troubleshooting

If you encounter issues with your SRNE ML4860N15 controller, consider the following basic troubleshooting steps:

No Display/Power: Check battery connections and voltage. Ensure the battery is adequately charged.
No Charging: Verify PV array connections and voltage. Check for shading on solar panels. Ensure the PV open circuit voltage is within the controller's limits.
Load Not Working: Check load connections and ensure the load current does not exceed 20A. Verify the selected load working mode.
Error Codes: If the display shows an error code, consult the full product manual (if available) or contact customer support with the specific code.
Overheating: Ensure adequate ventilation around the controller. Reduce load or PV input if consistently overheating.

For complex issues, it is recommended to contact qualified technical support.