yes,we provide after sales service,we apologize for the issue you encountered. Before addressing the problem, please visit the download center: https://jkbms-ess.com/pages/support#download-center to download the product manual for a more detailed understanding of the product. Understanding the product manual can help rule out simple wiring or app setup issues. If the problem persists, please contact us via WhatsApp: https://wa.me/18189383175. Thank you for your patience and support.

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 brands such as Growatt, Victron, Invent, GoodWe, SMA, Voltronic, SRNE, MUST, and SOFAR. If you cannot find your inverter brand in the device list, please try using the Pylontech low-voltage RS485 protocol. If you still cannot use it, please contact your inverter manufacturer to confirm protocol support. For any questions, please contact us at https://wa.me/18189383175.

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.

We have stock in the US and EU warehouses — orders from these regions typically arrive in 3–5 business days after order proceed. For other countries, standard shipping from China is by sea or by air. If you need express air shipping, please choose the expedited shipping,if there any shipping questions please contact us at https://wa.me/18189383175 for a custom quote.

Check that Pylontech Low Voltage RS485 protocol is selected, baud rate matches, and wiring is correct. Additionally, verify the BMS APP parameter settings and download instructions, and check the wiring usage and precautions for the protection board. manual download link: https://jkbms-ess.com/pages/support#download-center,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.