LCD-4.3-TTL-P 4.3 Inch TFT Display
The Universal On-Site Monitoring Screen For All JK Active Balancing BMS Systems
For solar installers, RV builders, marine technicians and industrial energy storage integrators, monitoring lithium battery data only via mobile Bluetooth APP can bring plenty of inconveniences. When your smartphone runs out of battery, loses Bluetooth connection, or you need to inspect battery status without taking out a mobile device, a dedicated wired LCD display becomes an irreplaceable auxiliary tool. The LCD-4.3-TTL-P 4.3-inch TFT display developed by JIKONG (JKVOLT) is a professional wired monitoring screen fully matched with the full series JK-BMS protection boards, designed to realize real-time offline battery data viewing, multi-protocol inverter compatibility, multi-language switching and customizable interface layout. Unlike small 2-inch or compact 3.2-inch screens with cramped display areas, this 4.3-inch large TFT panel delivers clear, complete data readouts for single battery packs and up to 16 parallel battery groups, supporting TTL serial communication, wide voltage power input and multi-brand inverter protocol adaptation. This comprehensive guide covers every hardware parameter, interface pin definition, screen menu function, APP matching setup, installation wiring and custom service of the LCD-4.3-TTL-P display, helping energy industry buyers select and deploy the most suitable local monitoring accessory for their lithium battery storage systems.
Core Advantages & Standout Product Features of LCD-4.3-TTL-P Display
The LCD-4.3-TTL-P is engineered to solve common pain points of low-cost small battery displays on the market, including narrow voltage input range, single language support, limited communication protocol compatibility, unclear small fonts and inability to monitor parallel battery arrays. Its integrated feature set makes it a premium upgrade for residential solar walls, off-grid power stations, motorhome lithium systems and commercial multi-pack energy storage plants:
- Ultra-wide power supply range from 9V to 36V with built-in reverse connection protection. It can be directly powered by all mainstream lithium battery pack voltages including 12V, 24V, 48V, 60V, 72V and high-voltage 96V~120V storage packs, eliminating the need for extra step-down power modules during installation.
- 4.3-inch high-definition TFT screen with 480*272 native resolution and 300nit LED backlight. The high brightness panel maintains clear visibility under strong outdoor sunlight, with 85° full viewing angle on left, right, upper and lower sides for convenient observation from all installation angles such as cabinet doors, RV dashboards and equipment control panels.
- Multilingual built-in system supporting four mainstream global languages: Chinese, English, Thai and Vietnamese. Users can switch language layouts directly on the display menu without re-flashing firmware, perfectly matching overseas end-users in North America, Europe, Southeast Asia and Australia.
- Independent TTL serial communication with fixed 115200 default baud rate, perfectly matched with the dedicated display port of all JK series BMS boards. Stable data transmission avoids signal dropouts caused by unstable Bluetooth wireless signals.
- Comprehensive real-time data display covering full battery metrics: total pack voltage, real-time charge/discharge current, remaining capacity percentage, Ah capacity value, maximum/minimum single cell voltage, cell voltage difference, highest/lowest temperature, alarm status and running power output (kW). For parallel energy storage systems, it supports synchronous data reading of up to 16 separate battery packs.
- Dual reserved expansion interfaces: main 6P HY2.0 user port for power and TTL signal transmission, plus an extra 6A A1254WF key extension port to control BMS power on and off via physical buttons mounted on control panels.
- Full customizable service support for commercial OEM customers. JKVOLT offers custom screen boot logos, customized UI layout, personalized data display sorting and exclusive language firmware development for brand wholesalers and energy equipment manufacturers.
- Massive built-in communication protocol library compatible with dozens of mainstream solar inverter brands, energy storage hosts and third-party BMS equipment via RS485 and CAN protocol switching on the display menu.
- Wide temperature tolerance for all climate conditions: operating temperature from -20°C to +70°C and storage temperature ranging from -30°C to +80°C, suitable for cold northern regions, high-temperature tropical areas and sealed indoor battery cabinets.
Complete Official Hardware Specification Sheet For LCD-4.3-TTL-P
1. Basic Display Panel Parameters
| Parameter Item | Detailed Specification | Unit |
|---|---|---|
| Screen Type | TFT Color Display | - |
| Diagonal Size | 4.3 | Inch |
| Native Resolution | 480 × 272 | Pixels |
| Backlight & Brightness | LED Backlight, 300nit | cd/m² |
| Viewing Angle (L/R/U/D) | 85 / 85 / 85 / 85 | Degree |
2. Power Supply Electrical Specifications
| Parameter Item | Min Value | Typical Data | Max Value | Unit |
|---|---|---|---|---|
| Input Working Voltage | 9 | 12 | 36 | V DC |
| Reverse Polarity Protection | Built-in hardware anti-reverse circuit | |||
| Total Power Dissipation | - | 1.32 | - | W |
| Working Current (12V Input) | - | 110 | - | mA |
3. Environmental Reliability Parameters
| Parameter Item | Min | Max | Unit |
|---|---|---|---|
| Continuous Operating Temperature | -20 | 70 | °C |
| Long-Term Storage Temperature | -30 | 80 | °C |
| Working Humidity Range | 10 | 90 | RH (Non-Condensing) |
4. Communication Basic Settings
The LCD-4.3-TTL-P adopts standard TTL 5V level serial communication, factory default baud rate fixed at 115200bps. The display’s internal protocol menu supports switching dozens of RS485 Modbus and CAN bus protocols to match Pylontech, Growatt, Deye, Victron, Voltronic, Luxpower and other mainstream energy storage inverters, tower shared battery cabinets and remote 4G-GPS monitoring modules. It also reserves user-custom protocol slots for OEM customers to add private communication standards.
Interface Layout & Full Pin Definition Breakdown
The LCD-4.3-TTL-P carries two separate plug-in connectors for different functional purposes, adopting industry-standard plug sockets to eliminate complicated soldering work during battery cabinet assembly. All matching cables are 0.5 meters long as standard, with customized longer wiring available upon wholesale order requests.
1. Main User Interface: HY2.0-6P Vertical Socket (Power & TTL Communication)
This core connector handles power input, serial TX/RX signal transmission and BMS activation signal connection, all six pin functions defined as below:
- K-: Activation Signal Negative, paired with K+ to send wake-up trigger signal to JK BMS board
- K+: Activation Signal Positive, used to manually activate the protection board via display control
- GND: Global Power & Signal Ground, common negative reference for power and serial data
- TTL-RX: UART Receive Pin (5V level), receives data sent out from BMS mainboard TX port
- TTL-TX: UART Transmit Pin (5V level), sends operation commands to the BMS mainboard RX port
- VCC: On-board Power Output, supplies auxiliary low-voltage power for external small accessories
2. Key Extension Interface: A1254WF-6A Socket (Optional Button Control)
The secondary expansion port is specially reserved for external physical power buttons. Installers can mount push switches on the outer door of battery cabinets or RV control panels to remotely switch the entire lithium battery system on and off without opening the cabinet to touch the BMS wiring area.
Step-by-Step Matching Setup Between LCD Display & JK BMS APP
Before the screen can normally read battery data from your JK active balancing BMS, a simple protocol configuration adjustment inside the official JK-BMS mobile APP is required. The setup workflow only takes 30 seconds and works for both iOS and Android versions of the APP:
- Complete all physical wiring between the LCD-4.3-TTL-P display and the dedicated display communication port on your JK-BD / JK-B series protection board, double-check K+, K-, GND, TTL-RX and TTL-TX pins for correct alignment to avoid signal failure.
- Power on the lithium battery pack to supply voltage to both BMS and LCD screen, open the JK-BMS APP and finish Bluetooth connection with your protection board.
- Navigate to the main "Parameter Setting" page inside the APP, locate the option labeled "UART3 Protocol Number".
- Scroll through the protocol list and select code 015, named "015-JK BMS PBxx SERIES LCD Protocol V1.0", which is the exclusive communication protocol for all JK TTL series LCD screens including this 4.3-inch model.
- Save parameter changes, wait 3~5 seconds for data synchronization, and real-time battery data will automatically populate the 4.3-inch display screen without extra firmware flashing.
If users need to connect the LCD screen to third-party inverters instead of original JK BMS, skip the APP setup step and directly enter the protocol selection menu on the LCD panel to switch corresponding RS485 or CAN bus standards matching your inverter brand model.
All Built-In Display Menu Interfaces & Functional Descriptions
The LCD-4.3-TTL-P features three core independent operation menus covering real-time battery overview, parallel pack individual data and multi-protocol switching settings, fully covering all monitoring demands for single battery systems and large parallel energy storage power plants.
1. Main Battery Group Overview Interface
This is the default boot screen shown every time the display is powered on, presenting all critical overall battery system data in one intuitive layout: total pack voltage, instantaneous charging/discharging current, real-time power output in kilowatts, remaining capacity Ah value and percentage, maximum single cell voltage, minimum single cell voltage, internal cell voltage difference, highest and lowest temperature readings across all NTC sensors, charge/discharge working status indicator, system alarm reminder and total number of online parallel battery packs. Field technicians can quickly judge abnormal conditions such as excessive cell imbalance, over-temperature faults and low residual power without entering sub-menus, ideal for daily rapid equipment inspection.
2. Independent Parallel Battery Pack Detail Interface
For large-scale energy storage projects requiring multiple BMS boards connected in parallel (up to 16 separate battery packs supported), users can enter this sub-menu to switch and view detailed parameters of every single parallel unit separately. Visible data for each pack includes rated design capacity, remaining capacity percentage, individual cell voltage of all series cells, pack charge/discharge state and local temperature value. This function greatly simplifies fault troubleshooting when one parallel battery string develops uneven voltage or temperature anomalies, allowing installers to pinpoint the problematic pack within seconds instead of testing every BMS one by one via mobile APP.
3. RS485 & CAN Communication Protocol Selection Menu
This powerful setting menu contains a complete library of industry-standard communication protocols to achieve seamless data interconnection between the LCD screen and external inverters, remote monitoring modules and third-party BMS hardware. The two separate protocol lists cover RS485 Modbus standards and CAN bus standards respectively:
RS485 Protocol List Supported:
4G-GPS remote module protocol, original JK BMS Modbus, NIU vehicle battery protocol, China tower shared battery cabinet dual versions, PYLON low voltage battery protocol, Growatt hybrid inverter protocol, Voltronic inverter communication standard, WOW energy storage protocol, exclusive JK LCD screen protocol and two slots for user self-defined serial protocols with adjustable baud rate fixed at 9600bps for Modbus equipment.
CAN Bus Protocol List Supported:
Original JK CAN 250K / 500K versions, Deye hybrid inverter CAN protocol, PYLON V1.2 CAN standard, Growatt low voltage CAN communication, Victron off-grid system protocol, MEGAREVO hybrid storage CAN, INVT inverter protocol, GoodWe LV battery standard, MUST solar equipment protocol, LuxpowerTek battery CAN and two blank user custom CAN protocol positions for private OEM integration.
After selecting the matching protocol code for your external device, the LCD screen will instantly synchronize battery data from the connected inverter or monitoring host without extra wiring modifications.
Typical Application Scenarios For LCD-4.3-TTL-P 4.3 Inch Monitoring Display
Thanks to wide voltage input, multi-language support, parallel battery monitoring capability and cross-brand inverter protocol compatibility, this TTL LCD screen serves as a perfect matching accessory for all JK-BMS active balancing protection boards, widely adopted in these global mainstream lithium battery application fields:
- Residential & commercial off-grid solar energy storage wall cabinets, mounted on cabinet doors for daily offline battery status check without smartphones
- RV, caravan and tiny mobile house lithium power systems, installed on vehicle dashboard to monitor high-voltage battery pack voltage, current and temperature during driving and camping
- Yacht, fishing boat and marine lithium battery power setups, resistant to wide temperature fluctuations in ship cabin environments
- Low-speed sightseeing carts, golf carts and resort mobility vehicle OEM battery pack control panels, supporting physical button wake-up via expansion interface
- Large parallel multi-bank commercial energy storage power stations, capable of monitoring up to 16 parallel battery packs on one single display screen
- Telecom base station backup UPS battery cabinets, paired with 4G-GPS remote modules via built-in serial protocol
- DIY lithium battery builders and energy equipment maintenance workshops, used for post-assembly full system testing and cell balance inspection
- OEM energy storage inverter manufacturers and battery pack wholesalers, supporting custom boot logo and UI layout for branded finished products sold to overseas markets
- Cold climate and tropical region stationary battery systems, with -20°C to +70°C wide operating temperature range adapting extreme ambient environments
Product Size & Standard Wiring Cable Information
The LCD-4.3-TTL-P display adopts compact thin PCB integrated structural design, with standardized overall thickness suitable for embedded installation inside most standard energy storage cabinet door reserved openings. The factory-matched signal and power cable length is 0.5 meters, sufficient for most conventional cabinet wiring layouts; bulk order clients can apply for customized longer cables according to special cabinet size demands without extra complex modification fees for large quantity orders. All cable connectors are pre-terminated with corresponding HY2.0 and A1254WF plugs, eliminating manual wire stripping and crimping work during on-site assembly to reduce wiring error risks.
Download Full Official LCD-4.3-TTL-P Technical Resources From Our Download Center
Every LCD-4.3-TTL-P display sold by JKVOLT comes with complete technical documents to support installers, DIY builders, wholesale distributors and OEM manufacturers during product installation, parameter debugging and after-sales maintenance. Our dedicated online download center hosts the full V1.0 official operation & maintenance manual for the 4.3-inch TTL display, complete pinout wiring diagrams, full RS485 & CAN protocol comparison tables, APP protocol matching step guides, dimension drawing files and accessory cable specification sheets. The download library also contains user manuals for 2.0-inch, 3.2-inch and 7.0-inch JK series LCD screens, full JK-BMS protection board datasheets, communication protocol whitepapers and heating/parallel module operation guides covering the entire JIKONG BMS product lineup from low-voltage 4S to high-voltage 32S models. All technical files are provided in universal downloadable PDF format for offline storage, on-site printing and long-term project reference.
Wholesale and OEM partners can submit support inquiries through the download center portal to obtain customized technical packs including OEM interface modification instructions and multi-language firmware reference documents for mass production projects. Whether you need precise connector pin definitions, protocol switching operation walkthroughs or dimension drawings for cabinet embedded design, all supporting engineering materials are centrally stored in our easy-access technical download hub for unlimited free viewing and downloading at any time.