After-Sales Service
JKBMS After-Sales Service Center – Technical Support, Downloads & Contact
Submit a support request, download product resources, or contact our team — all in one place.
🛠️ After-Sales Support Request
Experiencing an issue with your JKBMS product? Fill in the form below and our technical team will respond within 24 hours.
🔑 APP Default Passwords
📱 Bluetooth Connection Password:
1234
🔐 Authorization / Settings Password:
📖 Guide: How to Reset Your Password →🔄 APP Password Resetting →
123456
❓ Frequently Asked Questions
Yes. Download manuals and submit support requests at https://jkbms-ess.com/pages/support. You can also reach us at service@jkbms-ess.com or WhatsApp: https://wa.me/18189383175
Bluetooth connection password: 1234. Parameter settings password: 123456. If you need a reset, contact us on WhatsApp: https://wa.me/18189383175 with your serial number.
Contact us on WhatsApp at https://wa.me/18189383175 with your serial number and we will provide a temporary password.
Our BMS supports inverters compatible with the Pylontech Low Voltage RS485 protocol, including Growatt, Deye, Victron, SMA, Sofar, Solis, Voltronic, and more. Check with your inverter manufacturer to confirm protocol support. Contact us at https://wa.me/18189383175 for further confirmation.
0.4A: 20–80Ah (portable, e-bikes). 0.6A: 50–120Ah (RV auxiliary, light storage). 1A: 100–230Ah (standard home ESS). 2A: 200Ah+ (large ESS, 280Ah/304Ah packs). For aged or B-grade cells, always choose the higher rating.
EU warehouse orders: 3–5 business days. Standard shipping from China: 7–18 business days. Express shipping from China: 5–8 business days. Contact us at https://wa.me/18189383175 for shipping options.
Check that Pylontech Low Voltage RS485 protocol is selected, baud rate matches, and wiring is correct. If the issue persists, contact us at https://wa.me/18189383175 with your BMS model and inverter brand.
All products undergo strict factory testing. Manufacturing defects are covered by our replacement/return policy. Issues caused by incorrect wiring, overvoltage, physical damage, or unauthorized modifications are handled via free repair service — customer covers return shipping. Contact service@jkbms-ess.com to initiate a claim.
The PB series supports up to 16 battery packs in parallel via the PLINK module (soft parallel). For hard parallel, a dedicated parallel module is required. Contact us at https://wa.me/18189383175 for guidance.
Yes. Contact us at service@jkbms-ess.com or https://wa.me/18189383175 with your required quantity and product models for a custom quote.
📥 Download Center
Click a category to expand and view available files.
JKBMS Product Selection Guide
Smart BMS & Inverter BMS · PDF · Google Drive
JKBMS JK-PBXAXSXP Smart BMS User Manual — V24.0.1
PB Series · Smart BMS · PDF · V24.0.1
JKBMS JK-BD6AxxS-20P Active Balance BMS User Manual — V19.1.1
BD6A Series · 20P · Active Balance · PDF · V19.1.1
JKBMS JK-BD4AxxS-6P-8P Active Balance BMS User Manual — V19.0.1
BD4A Series · 6P-8P · Active Balance · PDF · V19.0.1
JKBMS JK-BD4A20S-4P Active Balance BMS User Manual — V11.A.1
BD4A Series · 20S · 4P · Active Balance · PDF · V11.A.1
JKBMS JK-BD4A24S-4P Active Balance BMS User Manual — V11.A.1
BD4A Series · 24S · 4P · Active Balance · PDF · V11.A.1
JKBMS JK-B2A32S-RP Active Balance BMS User Manual — V20.1.1
B2A Series · 32S · RP · Active Balance · PDF · V20.1.1
JKBMS JK-B2A25S-RP Active Balance BMS User Manual
B2A Series · 25S · RP · Active Balance · PDF
JKBMS JK-BD6A8S-10P Active Balance BMS User Manual — V19.0.1
BD6A Series · 8S · 10P · Active Balance · PDF · V19.0.1
JKBMS JK-BD6A24S-4PD Active Balance BMS User Manual — V20.3.1
BD6A Series · 24S · 4PD · Active Balance · PDF · V20.3.1
JKBMS JK-BD6A24S-15PD Active Balance BMS User Manual — V20.0.1
BD6A Series · 24S · 15PD · Active Balance · PDF · V20.0.1
JKBMS JK-BD6AxxS-8PD Active Balance BMS User Manual — V20.2.1
BD6A Series · 8PD · Active Balance · PDF · V20.2.1
JKBMS JK-BD6AxxS-10PD-12PD Active Balance BMS User Manual — V20.2.1
BD6A Series · 10PD-12PD · Active Balance · PDF · V20.2.1
JKBMS JK-BD6A24S-30P User Manual — V23.0.1
BD6A Series · 24S · 300A · Active Balance · PDF · V23.0.1
JKBMS JK-QB2A8S-20P User Manual — V19.4.1
QB2A Series · 8S · 200A · Active Balance · PDF · V19.4.1
JKBMS JK-BD4AxxS-6P-8P User Manual — V19.0.1
BD4A Series · 6P-8P · Active Balance · PDF · V19.0.1
JKBMS JK-BD6A8S-10P User Manual — V19.0.1
BD6A Series · 8S · 100A · Active Balance · PDF · V19.0.1
JKBMS JK-BD6A32S-10P User Manual — V20.1.1
BD6A Series · 32S · 100A · Active Balance · PDF · V20.1.1
JKBMS JK-B1A8S-10P User Manual — V19.1.1
B1A Series · 8S · 100A · Active Balance · PDF · V19.1.1
JKBMS JK-B2A8S-30P Active Balance BMS User Manual — V19.0.1
B2A Series · 8S · 300A · Active Balance · PDF · V19.0.1
JKBMS JK-B2A8S-20P Active Balance BMS User Manual — V19.2.1
B2A Series · 8S · 200A · Active Balance · PDF · V19.2.1
JKBMS JK-B2AxxS-15P-20P Active Balance BMS User Manual — V19.1.1
B2A Series · 15P-20P · Active Balance · PDF · V19.1.1
JKBMS JK-B2A24S-30P Active Balance BMS User Manual — V19.0.2
B2A Series · 24S · 300A · Active Balance · PDF · V19.0.2
JKBMS JK-BD6AxxS-20P Active Balance BMS User Manual — V19.1.1
BD6A Series · 20P · Active Balance · PDF · V19.1.1
JKBMS JK-BD4A24S-4P Active Balance BMS User Manual — V19.0.1
BD4A Series · 24S · 4P · Active Balance · PDF · V19.0.1
JKBMS APP Settings Manual
All BMS Series · APP Settings Guide · PDF
Dry Contact Settings
HC / HCR / HCRPB Series · Dry Contact · PDF
Heating Function Instructions
HC / HCR / HCRPB Series · Heating Module · PDF
JK-B15A24S Active Balancer User Manual — V11.6.1
B15A24S · Active Balancer · PDF · V11.6.1
Active Balancer APP Settings — V1.0
All Balancer Series · App Setup Guide · PDF · V1.0
JK-B5A24S Active Balancer User Manual — V11.0.1
B5A24S · Active Balancer · PDF · V11.0.1
JK-B4A24S Active Balancer User Manual — V11.1.1
B4A24S · Active Balancer · PDF · V11.1.1
JK-B2A24S Active Balance User Manual — V11.5.1
B2A24S · Active Balancer · PDF · V11.5.1
JK-B2A16S-TH Active Balancer User Manual — V11.5.1
B2A16S-TH · Active Balancer · PDF · V11.5.1
JK-B2A8S Active Balancer User Manual — V11.6.2
B2A8S · Active Balancer · PDF · V11.6.2
LCD 3.2" User Manual for BD BMS — V1.0
BD Series · 3.2 inch LCD · PDF · V1.0
LCD 4.3" for BD / B Series BMS (RS485)
BD / B Series · 4.3 inch LCD · RS485 · PDF
LCD 4.3" TTL-P User Manual — V1.0
PB Series · 4.3 inch LCD · TTL · PDF · V1.0
LCD 7.0" TTL-P User Manual — V1.0
PB Series · 7.0 inch LCD· TTL · PDF · V1.0
LCD 2.0" RS485 User Manual — V1.2
BD / B Series · 2.0 inch LCD · RS485 · PDF · V1.2
P-Link CR Interface Board — V1.0
PLINK Module · CR Interface · PDF · V1.0
JK-BLMK-5A Parallel Module User Manual — V3.0
Parallel Module · Hard Parallel · PDF · V3.0
LED-12 RGB Indicator User Manual — V1.2
LED Indicator · RGB · PDF · V1.2
LED-EXT5 RS485 User Manual — V1.0
LED Extension · RS485 · PDF · V1.0
RS485 Communication Protocol
HCRPB Series · Modbus RTU · PDF
CAN Bus Protocol
HC / HCR / HCRPB Series · CAN 2.0 · PDF
JKBMS-PBXX-V19.34
Inverter BMS PB Series · .rar
JKBMS-PBXX-V19.31
Inverter BMS PB Series · .rar
JKBMS App — Google Play
Android · Official Store
JKBMS App — App Store
iOS · Official Store
JKBMS App v5.12 — Android APK
Android · APK · v5.12 · Google Drive
JKBMS App v5.11 — Android APK
Android · APK · v5.11 · Google Drive
JKBMS App v5.10 — Android APK
Android · APK · v5.10 · Google Drive
JKBMS PC Monitor (Windows)
Windows · USB & RS485 · jk-bms-monitor.exe
JKBMS PC Monitor User Manual
PC Monitor · Windows · PDF
Inverter BMS — MUST Setup
MUST Inverter · RS485 / CAN · MP4
Inverter BMS — GROWATT RS485 Setup
GROWATT Inverter · RS485 · MP4
Inverter BMS — GROWATT CAN Setup
GROWATT Inverter · CAN Bus · MP4
Inverter BMS — DEYE Setup
DEYE Inverter · RS485 / CAN · MP4
ESS DIY Kit — White Vertical Roller Chassis
51.2V 314Ah · 白色立式滚轮电笱 · YouTube
ESS DIY Kit — Black 6U Stackable Chassis
51.2V 314Ah · 黑色 6U 堆叠式电笱 · YouTube
📞 Contact Us
Need to reach our team directly?
Technical Support
WhatsApp
💡 Preferred contact: Email (service@jkbms-ess.com) · WhatsApp (+1 818 938 3175) · Live Chat 💬
· For Live Chat: click the Chat button at the bottom-right corner of this page.
· Available 7×24 (replies may be delayed due to time zone differences)
· For Live Chat: click the Chat button at the bottom-right corner of this page.
· Available 7×24 (replies may be delayed due to time zone differences)
💼 Bulk order or quote? Contact our sales team directly.