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Q&A

Charge Controller

PWM controller: The total open-circuit voltage of solar panels connected in series must not exceed the maximum open-circuit voltage allowed by the controller, and the total short-circuit current in parallel connection must not exceed the rated charging current of the controller.

*  The PV modules voltage must match the battery system voltage.(12V/24V/36V48V) , otherwise the utilization of PV modules will be reduced.

MPPT controller: the total power of solar panels must not exceed the maximum power allowed by the controller (1.5 times of the rated power). The total open-circuit voltage in the series connection must not exceed the maximum open-circuit voltage allowed by the controller (the maximum open-circuit voltage at 25 °C).

  •  Bulk charging

In this stage, the battery voltage has not reached constant voltage (Equalize or Boost Voltage) yet. The controller operates in constant current mode, delivering its maximum current to the batteries (MPPT Charging). When the battery voltage reaches a preset value, it will switch to Constant Charging.

  • Constant charging

When the battery voltage reaches the constant voltage setpoint, the controller will start to operate in constant charging mode, and this process is no longer MPPT charging. In the meantime, the charging current will drop gradually, and the process is not the MPPT charging. The Constant Charging has 2 stages, equalize, and boost. These two stages are not carried out constantly in a full charge process to avoid too much gas precipitation or overheating of the battery. Among them, equalize charging starts only on the 28th of each month.

a) Boost charging
The Boost stage maintains 2 hours in default (user can adjust the constant time and preset value of boost voltage according to demand). When the duration reaches the set value, the system will switch to floating charging.

b) Equalize charging
Some types of batteries benefit from equalizing charges regularly, which can stir electrolytes, balance battery voltage, and accomplish chemical reactions. Equalizing charge increases battery voltage, higher than the standard complement voltage, which gasifies the battery electrolyte.

The equalizing charging time is also 2h by default (settable). Equalize charge and boost charge are not carried out constantly in a full charge process to avoid too much gas precipitation or overheating of the battery.

  • Floating charging

After the Constant voltage stage, the controller will reduce the charging current to the Float Voltage setpoint. This stage will have no more chemical reactions, and all the charge current transforms into heat and gas at this time. Then the controller reduces the voltage to the floating stage, charging with a smaller voltage and current. It will reduce the temperature of the battery and prevent the gassing and charging the battery slightly at the same time.

The MPPT Tracer AN, Xra N and Triron N solar charge controllers can be configured to charge lithium battery storage devices. but the parameters of lithium battery must be set by app, PC software and MT50 display. It is important that these storage devices have their own battery management system (BMS), which does not require communication with the solar charge controller.

The controllers of EPEVER are divided into the common positive and common negative. If the common positive BMS and negative ground controller are used together, it would cause damage to the controller or lithium battery. Therefore, when configuring a lithium battery solar off-grid system, please select the corresponding controller according to the BMS specifications (a lithium battery with a common anode selects a controller with a common anode.)

When selecting the “User” type to set the parameters of the lithium battery, the following precautions must be followed:

1) The control voltage parameters must be set by referring to the specifications of the lithium battery protection board, and the accuracy requirement of the lithium battery protection board is not greater than 0.2V. If the deviation is greater than 0.2V, which causes an abnormality in the system, EPEVER shall not directly or indirectly be liable for any loss or danger.

2) The temperature compensation coefficient is changed to 0;

3) The equalized voltage and the boosted voltage are the same, and the time is the same;

4) Each voltage point must follow the following logic.

a. Overvoltage Disconnect Voltage > Over-Charging Protection Voltage(from BMS) +0.2V;

b. Overvoltage Disconnect Voltage > Overvoltage Reconnect Voltage ≥ Charging Limit Voltage ≥ Equalize Charging Voltage = Boost Charging Voltage ≥ Float Charging Voltage > Boost Reconnect Charging Voltage;

c. Low-voltage Reconnect Voltage > Low-voltage Disconnect Voltage ≥ Discharge Limit Voltage;

d. Under-voltage Warning Reconnect Voltage > Under-voltage Warning Voltage ≥ Discharge Limit Voltage;

e. Low-voltage Disconnect Voltage > Over-discharge Protection Voltage(from BMS) +0.2V;

Warning: Please choose a lithium battery controller for lithium battery applications. It is not recommended to use a non-lithium battery controller to charge the lithium battery. If the system fails due to the use of a mismatched controller, EPEVER shall not directly or indirectly be liable for any loss or danger.

1) Run the APP and click on “Read” then enter the “battery settings”;

2) Click on “Read” again;

3) Please follow lithium battery specifications to set the rated voltage, battery type, number of series, low temperature charge, and discharge limit voltage from “Standard” interface;

4) Click “Advanced” to check whether the default control voltage points are as same as the lithium battery parameters, if not, please modify it according to the lithium battery specification and click “send”;

*  Note: After successfully sending the parameters, it will show “Operation Successful“

5) Click” Read” again to check whether the parameters have been set successfully.

1) Please download the software V1.95-Windows.zip. (https://www.epsolarpv.com/downsoft.html)

2) Connect PC software and controller, the controller powers up and runs.

3) Open PC software “Solar Station Monitor” and establish communication.

4) Click “Parameters” → “Control parameter” → “Control parameter (For LiBattery controller product)”.

5) Click “Read”. Receive the prompt of ” Successful operation “. CAUTION: Always click on ‘Read’ first, before setting any parameters.

6) Please modify the parameters according to the lithium battery specification. You have to modify the Libattery type, rated voltage level, and all the voltage from Over volt. Disconnect Volt to Under Volt. War. Reco. Volt.

*  CAUTION1: ‘LiBattery Protection’ must be ‘Enable’; otherwise, the lithium battery protection features cannot be activated.

7) After confirming the above parameters, click “Update.”

8) Click ‘Update’ again to double-check if the parameters are successfully updated.

9) Return to the monitoring interface and go to “Parameters” → “Device Parameters” → “Device Parameter Settings.”

10) Click ‘Read’ in the “Li battery parameter.”

11) Please set the “Low-temperature Charging Limit ” and “Low-temperature Discharging Limit ” according to the lithium battery specification.

12) Click “Update” after confirming the above parameters

Step 1: Determination of Installation Location and Heat-dissipation Space

Installation location and heat dispatch (can be wall mounted or laydown): The controller shall be installed in a place with sufficient air flow through the radiators of the controller and a minimum clearance of 150 mm from the upper and lower edges of the controller to ensure natural thermal convection. Please see below Figure:

Step 2: Installation Procedure
Connect the system in the order of ❶ battery ❷ load ❸ PV array in accordance with below Connection diagram and disconnect the system in the reverse order❸ ❷ ❶.

*  CAUTION1: To avoid load short circuit fire, a fuse current, which is 1.25 to 2 times to the rated current of the controller must be installed on the battery side with a distance from the battery not greater than 150 mm.

*  CAUTION2: The output voltage of the Controller load terminals is the same as the battery side. And max output current is the same as the rated discharge current. Make sure surge current of the load doesn’t exceed controller rated discharge current. Or it may cause damage to the controller.

*  CAUTION3: If a sensitive or capacitive load (such as the inverter) is connected to the system, and connect the load directly to the battery, not to the load side of the controller. Or it may cause input pulse current protection or damage to the controller.

*  WARNING: Risk of electric shock! When wiring the solar modules, the PV array can produce a high open-circuit voltage, so turn off the breaker before wiring and be careful when wiring. Additional fuse and breakers (1.25-1.5 times of total PV Isc current) are suggested to install.

*  CAUTION: While wiring, the controller does not close the circuit breaker or fuse and make sure that the leads of “+” and “-” poles are connected correctly.

Step 3: Grounding
Connect grounding according to the electric controller design, or don’t grounding connect. But the grounding terminals must be connected to ground to block EMI and avoid electric shock from the case.

*  CAUTION: Choose the correct common positive or common negative controller for your common positive or common negative system. Or it may damage the charge controller.

Step 4:Powered on the controller
Switch on battery fuse. Then check the status of the battery indicator (See detail on User manual). Close the fuse and circuit breaker of the load and PV array. Then the system will be operating in the preprogrammed mode.

Only the MPPT Tracer 50A-100A charge controllers support up to 6 units in prallel by using a parallel adapter (PAL-ADP-50AN). After adding the parallel adapter, the charging current of each controller can be adjusted automatically in real-time. The charging operation status of the controller is automatically adjusted according to the battery charging state to improve the redundancy of the entire photovoltaic system.

No, on the controller you can only choose the battery typ as Gel, Sealed or Flooded and you cannot set the battery parameters. The parameters can be set with controller accessories like eBox-Wifi, eBox-Bluetooth, USB-RS485 Cable through Smartphone, PC-Software or MT50 Display.

Remote Battery Voltage Sensor (RBVS) can eliminate the impact of the voltage drop on the battery connection wire. And it collects more accurate battery voltage to achieve accurate voltage control of the battery.

1). Find a cable (less than 1mm2)

*  Attention:There is no current while Remote Battery Voltage Sensor(RBVS)connect to battery,so wire size 1mm2 is enough for data collecting.

2). Plug one side of the cable into the RBVS Terminal (shown as Remote Voltage Sensor in the picture)

3). Plug the other side of the cable to the Battery

*  IMPORTANT: Please check the print logo carefully, and connect RBVS”+” to the battery terminal ”+” and RVB ”-“ to battery “-“. Don’ t make it reverse, or it will damage the RBVS interface.

(Do NOT connect to the eBox-BLE device from your phone settings.)

Step 1: Go to your phone settings and find Bluetooth.

Step 2: Turn on the Bluetooth but do NOT connect to the eBox-BLE device (Wrong step: if you connect to eBox-BLE device here, it will ask for a PIN code).

Step 3: Quit your phone settings and go directly to EPEVER phone app, then select “BLE.”

Step 4: The app automatically searches for devices, if not, please click on the “Search” button and select your Ebox-BLE device.

Step 5: Return to the main page, and you are all set after shown “Device Connected.”

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Step 1: Plugin the communication cable to RS485 port on the eBox-WIFI device (the green power light will be on)

Step 2: Go to WI-FI settings

Step 3: Connect to the eBox-WIFI device

Step 4: Wait until the WIFI signal appears (IMPORTANT! It may take a while for application authorization, please be patient) The green link light will be on after connected successfully to your phone.

Step 5: Open the Application (the name of the application might be different) and select WIFI

Step6: Wait until the message “Device Connected,” now the eBox-WIFI is successfully connected.

1)Always “Read” the parameters before any modification on each page.

2)Check if the parameters are set according to the rules before “Send.”

3)Please “Read” the parameters again after sending successfully and check whether the parameters are as same as the changed values.

4)Restart the device and the App, then check if set the parameters successfully.

1) Please check the input value is in the normal range.

2) Please, check if the input value is under voltage level range and followed the voltage setting rule

3) Please, check if you entered the wrong symbol as period (in US English)

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