Remote Meter
User Manual
MT52
Important Safety Instructions
Please keep this manual for future reference.
This manual contains all the safety, installation, and operating instructions for the remote meter.
General safety information
- Please inspect the MT52 thoroughly after it is delivered. If any damage is seen, please notify the shipping company or our company immediately. A photo of the damage may be helpful.
- Read all instructions and cautions in the manual before starting the installation.
- Keep the MT52 away from rain, exposure, severe dust, vibrations, corrosive gas, and intense electromagnetic interference.
- Avoid water entering the remote meter.
- There are no user-serviceable parts inside the remote meter. Do not disassemble or attempt to repair it.
WARNING
Do not install this product in humid, salt spray, corrosion, greasy, flammable, explosive, dust accumulative, or other severe environment.
General Information
1.1 Features
The MT52 remote meter, using with the controllers designed with RS485 communication, can monitor the controller’s real-time working status and program the parameters.
Features:
- Easy to install and operate
- Real-time display of fault alarms
- Locally reading of real-time parameters
- Powered by the controller directly
- Equipped with an RJ45 communication port
1.2 Main functions
Functions like real-time monitoring of system data, browsing and modifying related parameters, and restoring factory defaults are based on the LCD and functional key operation.
1.3 Recommendations
● Applicable Models
| Product Series | Battery Type | Interface Type |
| LS-B, GM-N, VS-BN, Tracer-BN | Lead—acid battery, user define | RJ45 |
| iTracer-AD/ND | Lead—acid battery, user define | 3.81-4P |
| Tracer-BP(1) | Lead—acid battery, user define | RS485 waterproof port |
| Tracer-CPN | Lead-acid battery, lithium battery, user define | |
| Tracer-AN (50A-100A)(1) | Lead—acid battery, user define | RJ45 |
| Tracer-AN (10A-40A), Tracer-AN G3, TRIRON, XTRA-N, XTRA-N G3 |
Lead—acid battery, lithium battery, user define |
(1) MT52 does not support lithium battery parameter setting for Tracer-BP and Tracer-AN (50A–100A) series, if you need it, we recommend you to purchase EPEVER WiFi/Bluetooth/USB to RS485 communication cable and other accessories.
- When the MT52 is connected with different devices, the configurable battery types are listed as the above table. For detailed battery types and setting method, refer to Section 4.6 Control parameter.
- Do not install the MT52 in a situation with strong electromagnetic interference.
- The MT52 comes standard with an RS485 communication cable (CC-RS485- RS485-200U). If it is connected to a controller with a not standard RJ45 interface, please purchase an appropriate communication cable in advance.
Installation
● Frame mount dimensions (mm)
| Mechanical Parameter | Parameter |
| Overall dimension | 114mm × 114mm × 48.2mm |
| Mounting dimension | 84mm × 84mm |
| Screw hole dimension | Φ5mm |
● Mounting on the wall
Step 1: Locate and drill screw holes based on the frame mounting dimension of the base, and install the plastic expansion bolts.
Step 2: Fix the frame with four ST4.2 × 3 self-tapping cross recessed pan head screws.
Step 3: Use four M4 × 8 pan head screws to mount the MT52 panel on the frame.
Step 4: Mount the four associated screw plugs into the screw holes.
● Mounting on the panel surface
Step 1: Locate and drill screw holes based on the installation size of the surface.
Step 2: Use four M4 × 8 cross recessed pan head screws with M4 nuts to mount MT52 panel onto the surface.
Step 3: Mount the four associated white screw plugs into the screw holes.
Note: Take full consideration of the plugging/unplugging space and the length of the communication cable during installation.
Product Features
Front view
Back view
RJ45 interface
| Module | Function |
| Failure indicator | Failure indicator flashes when there is fault occurs. Refer to the user manual of the controller for detailed failure information. |
| Communication indicator | Indicate the communication status between MT52 and the connected controller. |
| Display screen | Man-machine interface. Note: The display screen can be viewed clearly when the angle between the end-user’s horizontal sight and the display screen is within 90°, and the screen cannot be viewed clearly when the angle exceeds 90°. |
| Buttons | Include four navigation buttons and two operational buttons. Refer to the 4.1 Buttons for specific directions. |
| RJ45 interface | Connect with the controller; and it is used for communication and power supply. |
Note: Please use the communication plug, marked with “MT,” to connect MT52.
Monitoring screen
| Name | LCD Display | Instruction |
| Day and night icons |  |
Night |
 |
Day Note: The threshold voltage is 1V. When it goes higher than 1V, it is daytime. |
|
| Charge current icon |  |
The icon is dynamically running when there is a charge current. |
| Battery icon |  |
The battery capacity is dynamically displayed. Note: When the battery is over-discharged, this icon is  displayed as |
| Battery status icons |  |
Normal battery voltage |
 |
Battery under voltage | |
 |
Battery over-discharge | |
| Load current icon | |
The icon is dynamically running when there is a discharge current. |
| Load status icon |  |
Load On |
 |
Load Off Note: In the Manual Mode, press the “OK” button to switch on/off the load. |
|
| PV vol. and cur. values |  |
Display the PV voltage and current values. |
| Battery vol. and cur. Values |  |
Display the battery voltage and current values. |
| Load vol. and cur. Values |  |
Display the load voltage and current values. |
Operation
4.1 Buttons
The buttons are respectively (from left to right) “ESC,” “Left,” “Up,” “Down,” “Right,” and “OK”. The operation is described in the diagram below:
The default entry page is the browse mode. Press the 
button and input the correct password to enter the modification mode. 
and 
buttons could be used to move the cursor. 
and 
buttons could be used to modify the parameter values when the cursor is located at the current place. and 
buttons could be finally used to confirm and cancel the modification of the control parameters.
4.2 Main menu
Enter the Main Menu by pressing The and buttons are respectively used to move the cursor to select the menu items, and buttons are respectively used to enter or exit the corresponding pages of the menu items.
4.3 Real-time monitoring
There are 13 pages under real-time monitoring. Please check it as below:
Operational tips: Move between rows by pressing the or buttons. Move along a row by pressing the or buttons.
4.4 Device information
The controllers’ parameters are displayed below:
Operational tips: and buttons are respectively used to turn the browse page up and down.
4.5 Test operation
Load switch test is conducted on the connection solar controller to check if the load output is normal. The test does not affect the working settings under actual load, which means that the solar controller will exit from the test mode when exiting the Test Operation page.
Operational tips: Enter the page and input the correct password; use and buttons to modify the On/Off status. Press to confirm and press to cancel the test.
4.6 Control parameter
Browse, and modification operations are conducted over the control parameters of the solar controller. See the scope of parameter modification in the control parameters table and the page of control parameters in the diagram below:
1) Batt. Type
Supported battery types are shown as below.
| 1 | Lead–acid battery | Sealed (default) |
| Gel | ||
| Flooded | ||
| 2 | Lithium battery | LiFePO4 (LFP4S, LFP8S, LFP15S , LFP16S) |
| Li (NiCoMn) O2 (LNCM3S, LNCM6S, LNCM7S, LNCM13S, LNCM14S) |
||
| 3 | User define◆ | |
The battery type will display LiFePO4 15S/16S and Li(NiCoMn)O2 13S/14S only when the controller connected to the MT52 supports 48V system voltage.
◆ When modifying the battery type to “USE,” the default voltage point is the corresponding voltage before the battery type is modified.
2) Parameters of the Batt. AH, Temp Comp. Coeff and Rated Voltage
| Parameter | Default | Range |
| Batt. AH (Battery capacity) | 200Ah | 1 to 9999Ah |
| Temp Comp. Coeff (Temperature compensation coefficient ) |
-3mV/℃/2V | 0 to -9mv/℃/2V |
| Rated Voltage |
Auto | Auto/12V/24V/36V/48V |
When the battery type is selected as the lithium battery (LiFePO4 and Li(NiCoMn)O2 series), the “Temp Comp. Coeff ” and the “Rated Voltage” cannot be set. The software automatically enables the protection function of “Low temperature prohibits charge and discharge.”
3) Voltage parameters
● Battery voltage parameters
The below parameters are measured in the condition of 12V/25ºC. Please double the values in the 24V system and multiplies the values by 4 in the 48V system.
| Battery charging Setting | Sealed | Gel | Flooded | User |
| Over voltage disconnect voltage | 16.0V | 16.0V | 16.0V | 9–17V |
| Charging limit voltage | 15.0V | 15.0V | 15.0V | 9–17V |
| Over voltage reconnect voltage | 15.0V | 15.0V | 15.0V | 9–17V |
| Equalize charging voltage | 14.6V | — | 14.8V | 9–17V |
| Boost charging voltage | 14.4V | 14.2V | 14.6V | 9–17V |
| Float charging voltage | 13.8V | 13.8V | 13.8V | 9–17V |
| Boost reconnect charging Voltage | 13.2V | 13.2V | 13.2V | 9–17V |
| Low voltage reconnect voltage | 12.6V | 12.6V | 12.6V | 9–17V |
| Under voltage warning reconnect voltage | 12.2V | 12.2V | 12.2V | 9–17V |
| Under voltage warning voltage | 12.0V | 12.0V | 12.0V | 9–17V |
| Low voltage disconnect voltage | 11.1V | 11.1V | 11.1V | 9–17V |
| Discharging limit voltage | 10.6V | 10.6V | 10.6V | 9–17V |
| Equalize duration | 120min | — | 120min | 0–180min |
| Boost duration | 120min | 120min | 120min | 10–180min |
● When the battery type is “USE,” the battery voltage parameters follow the following logic:
A. Over Voltage Disconnect Voltage > Charging Limit Voltage ≥ Equalize Charging Voltage ≥ Boost Charging Voltage ≥ Float Charging Voltage > Boost Reconnect Charging Voltage.
B. Over Voltage Disconnect Voltage > Over Voltage Reconnect Voltage
C. Low Voltage Reconnect Voltage > Low Voltage Disconnect Voltage ≥ Discharging Limit Voltage.
D. Under Voltage Warning Reconnect Voltage > Under Voltage Warning Voltage ≥ Discharging Limit Voltage;
E. Boost Reconnect Charging voltage > Low Voltage Reconnect Voltage.
● Lithium Battery voltage parameters
| Battery type | LFP | ||||
| Battery parameters | LFP4S | LFP8S | LFP15S | LFP16S | User① |
| Over voltage disconnect voltage | 14.5V | 29.0 V | 54.7V | 58.4V | 9–17V |
| Charging limit voltage | 14.3 V | 28.6 V | 53.6V | 57.2V | 9–17V |
| Over voltage reconnect voltage | 14.3 V | 28.6 V | 53.6V | 57.2V | 9–17V |
| Equalize charging voltage | 14.2 V | 28.4 V | 53.3V | 56.8V | 9–17V |
| Boost charging voltage | 14.2 V | 28.4 V | 53.3V | 56.8V | 9–17V |
| Float charging voltage | 13.3 V | 26.6 V | 50.0V | 54.0V | 9–17V |
| Boost reconnect charging voltage | 13.0 V | 26.6 V | 49.7V | 52.0V | 9–17V |
| Low voltage reconnect voltage | 12.8 V | 25.6 V | 48.0V | 51.2V | 9–17V |
| Under voltage warning reconnect voltage | 12.2 V | 24.4 V | 45.7V | 48.8V | 9–17V |
| Under voltage warning voltage | 12.0 V | 24.0 V | 45.0V | 48.0V | 9–17V |
| Low voltage disconnect voltage | 11.3 V | 22.6V | 42.5V | 45.2V | 9–17V |
| Discharging limit voltage | 11.0 V | 22.0 V | 41.5V | 44.0V | 9–17V |
① The battery parameters under the “User” battery type is 9–17V for LFP4S.
They should × 2 for LFP8S, and × 4 for LFP15S/LFP16S.
| Battery type | LNCM | |||||
| Battery parameters | LNCM 3S | LNCM 6S | LNCM 7S | LNCM 13S | LNCM 14S | User① |
| Over voltage disconnect voltage | 12.8 V | 25.6 V | 29.8 V | 55.4V | 59.7V | 9–17V |
| Charging limit voltage | 12.6 V | 25.2 V | 29.4 V | 54.6V | 58.8V | 9–17V |
| Over voltage reconnect voltage | 12.5 V | 25.0 V | 29.1 V | 54.1V | 58.3V | 9–17V |
| Equalize charging voltage | 12.5 V | 25.0 V | 29.1 V | 54.1V | 58.3V | 9–17V |
| Boost charging voltage | 12.5 V | 25.0 V | 29.1 V | 54.1V | 58.3V | 9–17V |
| Float charging voltage | 12.2 V | 24.4 V | 28.4 V | 52.8V | 56.9V | 9–17V |
| Boost reconnect charging voltage | 12.1 V | 24.2 V | 28.2 V | 52.4V | 56.4V | 9–17V |
| Low voltage reconnect voltage | 10.5 V | 21.0 V | 24.5 V | 45.5V | 49.0V | 9–17V |
| Under voltage warning reconnect voltage | 12.2 V | 24.4 V | 28.4 V | 52.8V | 56.9V | 9–17V |
| Under voltage warning voltage | 10.5 V | 21.0 V | 24.5 V | 45.5V | 49.0V | 9–17V |
| Low voltage disconnect voltage | 9.3 V | 18.6 V | 21.7 V | 40.3V | 43.4V | 9–17V |
| Discharging limit voltage | 9.3 V | 18.6 V | 21.7 V | 40.3V | 43.4V | 9–17V |
① The battery parameters under the “User” battery type is 9–17V for LNCM3S.
They should × 2 for LNCM6S/LNCM7S, and × 4 for LNCM13S/LNCM14S.
● When the battery type is “USE,” the Lithium battery voltage parameters follow the following logic:
A. Over Voltage Disconnect Voltage > Over Charging Protection Voltage (Protection Circuit Modules(BMS)) + 0.2V;
B. Over Voltage Disconnect Voltage > Over Voltage 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 ≥ Discharging Limit Voltage.
D. Under Voltage Warning Reconnect Voltage > Under Voltage Warning Voltage ≥ Discharging Limit Voltage;
E. Boost Reconnect Charging voltage > Low Voltage Reconnect Voltage;
F. Low Voltage Disconnect Voltage ≥ Over Discharging Protection Voltage (BMS) + 0.2V
4.7 Load setting
The page of load setting could be used to set the four load working modes of the connection solar controller (Manual, Light on/off, Light on + timer, Time control).
Note: For detailed instructions on load settings, please refer to the relevant solar controller manual.
1. Manual control
| Mode | Introductions |
| ON | The load is on if the battery capacity is enough and no abnormal conditions happen. |
| OFF | The load is off all the time. |
2. Light On/Off
| Light On voltage (Night threshold) |
The load output is automatically turned on when the below situations occur at the same time: 1. The PV input voltage is lower than the Light On voltage. 2. The battery capacity is enough. 3. No abnormal conditions happen. |
| Light Off voltage (Day threshold) |
When the PV input voltage is higher than the Light Off voltage, the load output is automatically turned off. |
| Delay time | It means the confirmation time for the light signal. During this period, if the light signal voltage continues matching the Light On/Off voltage, the controller will perform corresponding actions (the time adjustment range: 0–99mins). |
3. Light On+ timer
| Working time 1 (T1) | Load working period after light control turns on the load |
Any working time is set as “0,” it means to stop working. The real working time of T2 depends on the night-time and the length of T1, T2. |
| Working time 2 (T2) | Load working period before light control turns off the load |
|
| Night-time | Total night-time by calculation ( ≥ 3h) |
4. Time control
| Working time1 (T1) | Control on/off time of the load through real-time clock mode. | Working time 1 is the compulsory load working time interval. Working time 2 is optional. |
| Working time2 (T2) | Realize the dual timer function of the load control through real-time clock mode. |
4.8 Device parameter
The solar controller’s software version could be checked via the device parameter page. And device data like device ID, device LCD backlight time, and device clock could also be checked and modified. The device parameter page shows in the Working time 1 is the
compulsory load working time interval. Working time 2 is optional. diagram below:
The solar controller’s software version could be checked via the device parameter page. And device data like device ID, device LCD backlight time, and device clock could also be checked and modified. The device parameter page shows in the diagram below:
Note:
- The bigger the connection device’s ID value, the longer the communication identification interval will be (the maximum interval < 6 minutes).
- For detailed instructions on device parameters, please refer to the relevant solar controller manual.
| Type | Notes |
| Ver | It indicates the Solar controller’s software and hardware version numbers. |
| ID | It indicates the Solar controller’s communication ID numbers. |
| Bklight | It indicates the Solar controller’s LCD backlight time. |
| Month-Day-Year H: M: S | It indicates the Solar controller’s internal clock. |
4.9 Device password
The solar controller’s password could be modified via the device password page.
The device password is a 6-digit figure which is required before entering the modification mode of “Control parameter,” “Load setting,” “Device parameter,” “Device password,” “Factory reset” pages. The page of the device password in the diagram shows as below:
Note: The default password of the solar charge controller is” 000000″.
4.10 Factory reset
The solar charger controller’s default parameters could be restored via the Factory reset page. Including the “Control parameter,” “Load setting,” “Charge mode,” and “Device password” could all be restored to the factory defaults (the factory default password of the devices is “000000”).
4.11 Failure information
The solar controller’s failure information could be checked via the Failure information page (a maximum of 15 failure messages could be displayed). After the solar controller’s failures are eliminated, the corresponding failure information will also be automatically eliminated.
Common failure information
| Failure type | LCD display | Instructions |
| Charging device failures | Load MOS-Short | The MOSFET of the load driver is short-circuited. |
| Load Circuit | The load circuit is short-circuited. | |
| Load 0. cur. | The load circuit is over current. | |
| Char. MOS- Short | The MOSFET of the charge driver is short-circuited. | |
| Input vol. High | The input voltage is very high. | |
| Controller failure | Ctrler 0. Temp. | The controller is over-temperature. |
| Communication failure | Comm. Timeout | The communication is timeout. |
| Battery failures | Batt. 0. Hi. Temp. | The battery is over high temperature. |
| Batt. 0. Lo. Temp. | The battery is over low temperature. | |
| Rated Vol Err. | The rated voltage is in error. | |
| Batt. OVD | The battery voltage exceeds the over voltage disconnect (OVD) voltage value. | |
| Batt. UVW | The battery voltage is lower than the under voltage warning (UVW) voltage value. | |
| Batt. LVD | The battery voltage is lower than the low voltage disconnect (LVD) voltage value. | |
| Batt. Err | The battery type is in error. |
4.12 Meter parameter
The meter’s model, software, and hardware version could be checked via the meter parameter page. And the two parameters (Switch pages, Backlight) could be browsed and modified as well.
On the above anyone page, long-press + + + at the same time to enter the language selection page:
| Parameters | Default | Range | Remark |
| Sw-Pages | 0 | 0–120S | Set the automatic switching interval for the real-time monitoring pages. |
| BKlight | 20 | 0–999S | Set the LCD backlight time. |
| LangSel. | Cn | Cn/En | Switch the display language between Chinese and English. |
Warranty
Maintenance Procedure
Refer to the user manual or contact after-sales personnel to solve the faults before requiring maintenance. If it is confirmed that the maintenance needs to be carried out at the factory, send the product to our company by express delivery, prepay the shipping cost, and provide purchase invoice as the basis for warranty.
Indicate the model number, usage environment data, and a detailed description of the fault on the returned product to obtain the quick warranty service. This information is important for addressing your repair requirements.
If the device is damaged due to customer’s improper use or failure to follow this user manual, we will not be responsible!
The maintenance follows the above procedures, and the maintenance costs will occur during the maintenance process.
Technical Specifications
| Electrical Parameter | |
| Self-consumption | Backlight ON < 23mA |
| Backlight OFF < 15mA | |
| Mechanical Parameter | |
| Faceplate dimension | 98mm x 98mm |
| Frame dimension | 114mm x 114mm |
| Communication port | RJ45 |
| Communication cable (m) | Standard: 2m, Longest: 50m |
| Net weight | Simple package: 0.23Kg Standard package: 0.32kg |
| Environmental Parameter | |
| Environment temperature | -20°C to +70°C |
RJ45 pin definition:
| Pin No. | Definition |
| 1 | +5–12V Power input |
| 2 | +5–12V Power input |
| 3 | RS485-B |
| 4 | RS485-B |
| 5 | RS485-A |
| 6 | RS485-A |
| 7 | GND |
| 8 | GND |
Data cable pin definitions
Appendix Dimensions
Unit: mm
Any changes without prior notice!
Version number: V1.2
SolarV GmbH
Tel: +4961969076877
E-mail: info@solarv.de
www.solarv.de
Documents / Resources
 |
SolarV MT52 Remote Meter Charge Controller Regulator [pdf] User Manual MT52, MT52 Remote Meter Charge Controller Regulator, MT52, Remote Meter Charge Controller Regulator, Meter Charge Controller Regulator, Charge Controller Regulator, Controller Regulator, Regulator |