EP Solar ET2415N User manual

eTracer series
—— Network Maximum Power Point Tracking
Solar Charge Controller
Models:
ET2415N ET3415N ET4415N ET6415N
EPsolar
OPERATION
MANUAL

Thank you very much for selecting our product!
This manual offers important information and suggestion about installation, use and
troubleshooting, etc. Please read this manual carefully before using the product and
pay attention to the safety recommendations in it.
Final interpretation right of the manual belongs to EPsolar.
Any changes without prior notice！

Contents
1.0 Important Safety Information.............................................................. 1
2.0 General Information ............................................................................ 2
2.1 Overview .......................................................................................................2
2.2 Models & Parameters.....................................................................................3
2.3 Characteristics................................................................................................4
2.4 Optional Accessories .....................................................................................6
3.0 Installation Instructions....................................................................... 7
3.1 General Installation Notes..............................................................................7
3.2 Mounting .......................................................................................................7
3.3 Wiring............................................................................................................9
4.0 Operation........................................................................................... 13
4.1 MPPT Technology.......................................................................................13
4.2 Battery Charging Information......................................................................15
4.3 LED Indication ............................................................................................17
4.4 Display & Operation....................................................................................17
5.0 Networking & communication.......................................................... 25
5.1 Introduction .................................................................................................25
5.2 Setting..........................................................................................................26
5.3 Other Introductions......................................................................................32
6.0 Protections, Troubleshooting & Maintenance................................... 34
6.1 Protections...................................................................................................34
6.2 Troubleshooting...........................................................................................35
6.3 Maintenance.................................................................................................36
7.0 Warranty............................................................................................ 38
8.0 Specifications .................................................................................... 39
9.0 Conversion Efficiency Curves........................................................... 42
10.0 Dimensions...................................................................................... 45

Page 1
1.0 Important Safety Information
This manual contains important safety, installation and operating instructions for
eTracer. Save these instructions.
The following symbols are used throughout this manual to indicate potentially
dangerous conditions or mark important safety instructions. please take care when
meeting these symbols.
WARNING: Indicates a potentially dangerous condition.
Use extreme caution when performing this task.
CAUTION: Indicates a critical procedure for safe and proper
operation of the controller.
NOTE: Indicates a procedure or function that is important for the
safe and proper operation of the controller.
General Safety Information
·Read all of the instructions and cautions in the manual before installation.
·There are no user serviceable parts inside the controller. Do not disassemble or
attempt to repair the controller.
·Mount the controller indoors. Prevent exposure to the elements and do not allow
water to enter the controller.
·Please install controller in ventilated places, the temperature of heat sink may be
quite high when working.
·Install external fuses/breakers as required.
·Disconnect the solar module and fuse/breakers near to battery before installing or
adjusting the controller.
·Confirm that power connections are tightened to avoid excessive heating from loose
connection.

Page 2
2.0 General Information
2.1 Overview
Thank you for selecting the eTracer controller. With the features of industrial class
product of high efficiency and reliability, the controller is a high-end product based on
multiphase synchronous rectification technology. The features are listed below:
·12V/24V/36V/48V auto work
·Excellent EMC design
·Thermal design and nature air cooling
·The first tracking to the maximum power point of solar modules less than 15 seconds,
tracking efficiency Max. 99%
·Multiphase synchronous rectification technology ensures peak conversion efficiency
up to 98%
·Multiphase power decentralized control make small power charging high effective,
and improve the generated energy
·High speed and performance of the double processors architecture, improve the
response speed and optimize the performance of the system
·Multiphase control technology, optimizes charging current smoothness, reduces
ripple, and improves the system generating efficiency
·Humanized browser interface
·128*64 dot-matrix LCD intuitively displays data and state, 6 buttons combinations
for easy operation
·View up to 450 days data logging by connecting to Ethernet.
·Update controller software by connecting to PC
·RS232, CAN BUS and Ethernet 3 kinds of communication way to meet different
occasions of demand
·Sealed, Gel and Flooded battery option
·Three stages of optimizing charging control
·Protection: over heat, over charging, PV short circuit and PV (battery) revered

Page 3
The controller features a built-in fuzzy control algorithm that maximizes the energy
from the solar module(s) and charge the battery.
The controller charging process has been optimized for lengthening battery life and
improved system performance. The comprehensive self-diagnostics and electronic
protection functions can prevent damage from installation mistakes or system faults.
Although the controller is very simple to configure and use, please take your time to
read the operation's manual. This will help you make full use of all the functions and
improve your PV system.
2.2 Models & Parameters
Standard RS232, CAN BUS and ETHERNET communication interface
12V/24V/36V/48V system voltage auto work*
Max. PV input voltage DC150V**
Rated charging current
Max. PV input power
ET2415N
20A
1040W
ET3415N
30A
1600W
ET4415N
45A
2400W
ET6415N
60A
3200W
* Every time start up the controller, system voltage automatically identified, do not
need your any operation or setting.
** Array voltage should never exceed maximum PV input voltage. Refer to the solar
module documentation to determine the highest expected array Voc (open circuit
voltage) as defined by the lowest expected ambient temperature for the system
location.

Page 4
2.3 Characteristics
Figure 2-1 Characteristics
2
3
4
5
1
8
9
11
12
PV
vd
VV
+
-
7
10
6
Batt.

Page 5
1 –LCD
Display interface, 128x64 dot-matrixes
2 –Buttons
Browse or modify all parameters.
3 –Battery Indicator
An LED indicator shows battery status.
4 –Charging Indicator
An LED indicator shows charging or not.
5 –Faults Indicator
An LED indicator shows controller faults.
6 –Terminal
Refer to Figure 2-2
7 –Serial RS-232 Port (DB9)
Monitor controller by PC or update controller software.
8 –Ethernet Port (RJ45)
Connect Ethernet, monitor controller remotely by network.
9 –Solar polarity reversed Indicator
An LED indicator shows solar modules positive and negative reversed.
10 –Remote Temperature Sensor Port (MC1.5-3.81-2L)
Connect RTS, Measure battery temperature to make temperature compensation.
11 –Remote Battery Voltage Sensor Port (MC1.5-3.81-2L)
Connect RBVS, measure battery voltage accurately.
12 –CAN BUS Port (MC1.5-3.81-4L)
Communicate with other CAN BUS devices made by EPsolar.

Page 6
2.4 Optional Accessories
Remote Temperature Sensor (Model: RTS300RA)
Acquiring of battery temperature for undertaking temperature compensation of control
parameters, the standard length of the cable is 2m (can be customized if want longer).
The RTS300RA connects to the MC1.5-3.81-2L port (10th) on the controller.
Figure2-2 Wiring diagram
Remote Battery Voltage Sensor Port (MC1.5-3.81-2L)
Detect the battery voltage exactly, the standard length of the cable is 2m (can be
customized if want longer). The RBVS200VAconnects to the MC1.5-3.81-2L port
(11th) on the controller.

Page 7
3.0 Installation Instructions
3.1 General Installation Notes
·Read through the entire installation section first before installation.
·Be very careful when working with batteries. Wear eye protection. Have fresh water
available to wash and clean any contact with battery acid.
·Uses insulated tools and avoid placing metal objects near the batteries.
·Explosive battery gasses may be present during charging. Be certain there is
sufficient ventilation to release the gasses.
·Avoid direct sunlight and do not install in locations where water can enter the
controller.
·Loose power connections and/or corroded wires may result in resistive connections
that melt wire insulation, burn surrounding materials, or even cause fire. Ensure
tight connections and use cable clamps to secure cables and prevent them from
swaying in mobile applications.
·Use with Gel, Sealed or Flooded batteries only.
·Battery connection may be wired to one battery or a bank of batteries. The following
instructions refer to a singular battery, but it is implied that the battery connection
can be made to either one battery or a group of batteries in a battery bank.
·Multiple same models of controllers can be installed in parallel on the same battery
bank to achieve higher charging current. Each controller must have its own solar
module(s).
·Select the system cables according to 3A/mm2or less current density.
3.2 Mounting
NOTE: When mounting the eTracer, ensure free air through the
controller heat sink fins. There should be at least 150mm of clearance
above and below the controller to allow for cooling. If mounted in an

Page 8
enclosure, ventilation is highly recommended.
WARNING: Risk of explosion! Never install the eTracer in a sealed
enclose with flooded batteries! Do not install in a confined area where
battery gas can accumulate.
Step 1: Choose Mounting Location
Locate the eTracer on a vertical surface protected from direct sun, high temperature,
and water.
Step 2: Check for Clearance
Place the eTracer in the location where it will be mounted. Verify that there is
sufficient room to run wires and that there is sufficient room above and below the
controller for air flow.
Figure 3-1 Mounting and cooling
Cool air
Warm air
At least
150mm
At least
150mm

Page 9
Step 3: Mark Holes
Mark the four (4) mounting hole locations on the mounting surface.
Step 4: Drill Holes
Remove the controller and drill four sizeable holes in the marked locations.
Step 5: Secure Controller
Place the controller on the surface and align the mounting holes with the drilled holes
in step 4. Secure the controller in place using the mounting screws.
3.3 Wiring
NOTE: A recommended connection order has been provided for
maximum safety during installation.
NOTE: Do not entangle all wiring together, communication cable and
power wires should be as far away as possible, to prevent interfering
communication signal transmission.
NOTE: The eTracer is a negative ground controller. Any negative
connection of solar or battery can be earth grounded as required.
Grounding is recommended.
CAUTION: For mobile applications, be sure to secure all wiring. Use
cable clamps to prevent cables from swaying when the vehicle is in
motion. Unsecured cables create loose and resistive connections which
may lead to excessive heating and/or fire.
Step 1: Remote Temperature Sensor Connection
NOTE: The controller will not perform temperature compensation for
charging parameters if the RTS300RA is not used.
CAUTION: Equipment Damage! Never place the temperature sensor
inside a battery. Both the RTS300RA and the battery will be damaged.

Page 10
The included remote temperature sensor RTS300RA is recommended for effective
temperature compensated charging. Connect the RTS300RA to the10th port
(MC1.5-3.81-2L) on the controller (see figure 2-1). There is no polarity, so either
wire (+ or -) can be connected to either screw terminal. No damage will occur if
connect the RTS300RA to the remote battery voltage sense port, but the connection
will not be recognized.
Step 2: Remote Battery Voltage Sensor Connection
NOTE: When connecting, please pay attention to ‘+’ and ‘-’
CAUTION: Be careful when installation. Please never plug the voltage
sensor wires into to the RTS300RA terminals (10th Port) It will cause
an alarm or damage the controller.
The voltage at the battery terminals on the controller may differ slightly from the real
battery voltage due to connection and cable resistance. The remote battery voltage
sensor will enable the controller to detect the battery voltage more exactly and avoid
voltage tolerance. Connect the remote battery voltage sensor wires to the 11th port
(MC1.5-3.81-2L) on the controller (see figure 2-1). A battery voltage sensor
connection is not required to operate the controller, but it is recommended for best
performance.
The voltage sensor wires should be cut to the length as required. The wire size can
range from 0.25 to 1.0 mm2(24 to 16 AWG). And maximum length is 3m. A twisted
pair cable is recommended but not required.
Please be careful to ‘+’and ‘-’when connecting. No damage will occur if the polarity
is reversed, but the controller can’t read a reversed sensor voltage.
Step 3: Network Connection
WARNING: Shock Hazard! The network cables and the power
conductors must be as far away as possible.

Page 11
There are three kinds of communication: RS-232, CAN BUS and Ethernet. Please use
matching communication cables and make sure the cables are connected firmly during
data transmits
·RS-232 Connection:
The serial RS-232 port is a standard 9-pin (DB9) male connector. Refer to 9th port on
the controller in the figure 2-1.
·CAN BUS Connection:
The Can BUS port is a standard MC1.5-3.81-4L connector. Refer to 12th port on the
controller in the figure 2-1.
·Ethernet Connection:
The Ethernet port is a standard RJ-45 connector. Refer to 8th port on the controller in
the figure 2-1.
Step 4: Power Connection
WARNING: Risk of electric shock! Use fuses or breakers in solar and
battery circuits is recommended, and make them keep OFF state before
connection.
WARNING: Risk of electric shock! Exercise caution when handling
solar wiring. The solar module(s) high voltage output can cause severe
shock or injury. Pay more attention for it.
WARNING: Risk of explosion or fire! Never short circuit battery
positive (+) and negative (-) or cables.
·Battery Connection:
Connecting a fuse in series in the battery circuit, and the battery circuit fuse must be
1.25 to 2 times of the rated current. Make it keep OFF state before connection.
Connect battery positive (+) and negative (-) to battery terminals on the controller in
the figure 2-1. Please pay much attention to ‘+’and ‘-’
·Solar Module(s) Connection:

Page 12
Connecting a breaker in series in the solar circuit is recommended, and the breaker
must be 1.25 to 2 times of the rated current. Make it keep OFF state before connection.
Connect solar positive (+) and negative (-) to battery terminals on the controller in the
figure 2-1. Please pay much attention to ‘+’and ‘-’
Step 5: Power-Up
·Confirm that all connections are correct especially the Solar and Battery
polarities.
·Turn the battery fuse on first. Confirm battery power-up correct (refer to section
4.0)
·Note that a battery must be connected to the eTracer to start and operate the
controller. The controller will not operate only from solar input.
·Turn the solar breaker on. If the solar module(s) is in full sunlight, the controller
will begin charging.
·If the battery LED error exists or LCD interface alarms, please refer to section
6.0 for troubleshooting.

Page 13
4.0 Operation
4.1 MPPT Technology
The eTracer utilizes Maximum Power Point Tracking technology to extract maximum
power from the solar module(s). The tracking algorithm is fully automatic and does
not require user adjustment. eTracer technology will track the array maximum power
point voltage (Vmp) as it varies with weather conditions, ensuring that maximum
power is harvested from the array through the course of the day.
·Current Boost
In many cases, eTracer MPPT technology will ‘boost’ the solar charge current. For
example, a system may have 8 Amps of solar current flowing into the eTracer and 10
Amps of charge current flowing out to the battery. The eTracer does not create current!
Rest assured that the power into the eTracer is the same as the power out of the
eTracer. Since power is the product of voltage and current (Volts×Amps), the
following is true*:
(1) Power Into the eTracer =Power Out of the eTracer
(2) Volts In×Amps In=Volts Out×Amps Out
* Assuming 100% efficiency. Actually, the losses in wiring and conversion exist.
If the solar module’s Vmp is greater than the battery voltage, it follows that the
battery current must be proportionally greater than the solar input current so that input
and output power are balanced. The greater the difference between the maximum
power voltage and battery voltage, the greater the current boost. Current boost can be
substantial in systems where the solar array is of a higher nominal voltage than the
battery.
·An Advantage Over Traditional Controllers
Traditional controllers connect the solar module directly to the battery when
recharging. This requires that the solar module operate in a voltage range that is below

Page 14
the module’s Vmp. In a 12V system for example, the battery voltage may range from
11-15Vdc but the module’s Vmp is typically around 16 or 17V.
Figure 4-1 shows a typical current VS. voltage output curve for a nominal 12V
off-grid module.
Current VS. Voltage in 12V system Output power in 12V system
Figure 4-1 Nominal 12V solar module I-V curve and output power graph
The array Vmp is the voltage where the product of current and voltage (Amps×Volts)
is greatest, which falls on the ‘knee’ of the solar module I-V curve as shown in
Figure4-1. Because Traditional controllers do not operate at the Vmp of the solar
modules(s), energy is wasted that could otherwise be used to charge the battery and
power system loads. The greater the difference between battery voltage and the Vmp
of the module, the more energy is wasted.
eTracer MPPT technology will always operate at the Vmp resulting in less wasted
energy compared to traditional controllers.
·Conditions That Limits the Effectiveness of MPPT
The Vmp of a solar module decreases as the temperature of the module increases. In
very hot weather, the Vmp may be close or even less than battery voltage. In this
situation, there will be very little or no MPPT gain compared to traditional controllers.
However, systems with modules of higher nominal voltage than the battery bank will
always have an array Vmp greater than battery voltage. Additionally, the savings in
wiring due to reduced solar current make MPPT worthwhile even in hot climates.
Typical Battery
Voltage Range
Maximum
Power
Point
Traditional
Controller
Operating Range
eTracer
Maximum
Power
Point

Page 15
4.2 Battery Charging Information
The eTracer has a 3 stages battery charging algorithm for rapid, efficient, and safe
battery charging.
Figure 4-2 eTracer charging algorithm
·Bulk Charge
In this stage, the battery voltage has not yet reached boost voltage and 100% of
available solar power is used to recharge the battery.
·Boost Charge
When the battery has recharged to the Boost voltage setpoint, constant-voltage
regulation is used to prevent heating and excessive battery gassing. The Boost stage
remains for some time and then goes to Float Charge. Every time when the controller
is powered on, if it detects neither over discharged nor overvoltage, the charging will
enter into boost charging stage.
·Float Charge
After the Boost voltage stage, Tracer will reduce the battery voltage to float voltage
setpoint. When the battery is fully recharged, there will be no more chemical reactions
and all the charge current transmits into heat and gas at this time. Then the eTracer

Page 16
reduces the voltage to the floating stage, charging with a smaller voltage and current.
It will reduce the temperature of battery and prevent the gassing, also charging the
battery slightly at the same time. The purpose of Float stage is to offset the power
consumption caused by self consumption and small loads in the whole system, while
maintaining full battery storage capacity.
In Float stage, loads can continue to draw power from the battery. In the event that the
system load(s) exceed the solar charge current, the controller will no longer be able to
maintain the battery at the Float setpoint. Should the battery voltage remains below
the boost reconnect charging voltage, the controller will exit Float stage and return to
Bulk charging.
·Equalize
WARNING: Risk of explosion!
Equalizing flooded battery would produce explosive gases, so well
ventilation of battery box is necessary.
NOTE: Equipment damage!
Equalization may increase battery voltage to the level damaging to
sensitive DC loads. Ensure that all load allowable input voltages are
greater than the equalizing charging set point voltage.
NOTE: Equipment damage!
Over-charging and excessive gas precipitation may damage the battery
plates and activate material shedding on them. Too high an equalizing
charge or for too long may cause damage. Please carefully review the
specific requirements of the battery used in the system.
Certain types of batteries benefit from periodic equalizing charge, which can stir the
electrolyte, balance battery voltage and complete chemical reaction. Equalizing
charge increases the battery voltage, higher than the standard complement voltage,
which gasifies the battery electrolyte.