{"id":835837,"date":"2026-09-15T18:27:02","date_gmt":"2026-09-15T18:27:02","guid":{"rendered":"https:\/\/www.abnewswire.com\/pressreleases\/?p=835837"},"modified":"2026-09-15T18:27:02","modified_gmt":"2026-09-15T18:27:02","slug":"how-multiple-bms-units-communicate-in-a-parallel-energy-storage-system","status":"publish","type":"post","link":"https:\/\/www.abnewswire.com\/pressreleases\/how-multiple-bms-units-communicate-in-a-parallel-energy-storage-system_835837.html","title":{"rendered":"How Multiple BMS Units Communicate in a Parallel Energy Storage System"},"content":{"rendered":"

Dongguan City, Guangdong Province, China. – September 15,2026<\/p>\n

Quick Answer: Power Connection and BMS Communication Are Different<\/p>\n

When several battery packs operate in parallel, connecting them on the DC power side does not automatically connect their BMS units on the communication side.<\/p>\n

For the DALY 4th Gen Home Energy Storage BMS architecture covered here, the practical communication path is: Each Pack → Its BMS → Automatic BMS Identification → Internal RS485 → Main\/Host Communication Point → Inverter Communication.<\/p>\n

The customer therefore needs to verify three things separately: each pack has the correct BMS, the BMS units can be identified and linked internally, and the battery system uses the interface and protocol required by the exact inverter.<\/p>\n

Key point:<\/strong> Electrical parallel connection ≠ BMS communication ≠ inverter communication.<\/p>\n

1. Each Battery Pack Still Has Its Own BMS<\/p>\n

In a multi-pack battery bank, each battery pack is managed by its own BMS. The BMS monitors and protects that individual pack before the packs participate in the larger energy storage system.<\/p>\n\n\n\n\n\n\n\n\n
Battery pack<\/th>\nPack-level BMS<\/th>\n<\/tr>\n
Pack 1<\/td>\nBMS 1<\/td>\n<\/tr>\n
Pack 2<\/td>\nBMS 2<\/td>\n<\/tr>\n
Pack 3<\/td>\nBMS 3<\/td>\n<\/tr>\n
…<\/td>\n…<\/td>\n<\/tr>\n
Pack n<\/td>\nBMS n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

This means the power architecture and the communication architecture should be checked separately. A common DC connection does not create a BMS communication network by itself.<\/p>\n

2. Make Sure Every BMS Can Be Identified<\/p>\n

Once several BMS units share one multi-pack system, the system needs a reliable way to distinguish one BMS from another.<\/p>\n

In the supported DALY 4th Gen parallel architecture, automatic BMS address identification reduces the need for manual DIP-switch address configuration during commissioning.<\/p>\n

Customer check: Can the system identify each BMS correctly before you continue to inverter communication?<\/p>\n

BMS identification solves the device-identification step. It does not, by itself, confirm inverter compatibility.<\/p>\n

3. Connect the BMS Units Through the Internal Communication Layer<\/p>\n

For the DALY 4th Gen architecture covered by the available product materials, internal communication between parallel-pack BMS units uses RS485 in a daisy-chain arrangement.<\/p>\n

A simplified communication path is: Pack 1 \/ BMS 1 → Pack 2 \/ BMS 2 → Pack 3 \/ BMS 3 → … → Pack n \/ BMS n.<\/p>\n

This RS485 communication path is different from the main DC power connection between the battery packs.<\/p>\n

Actual connector pin definitions, cable sequence, termination, and commissioning procedures should follow the applicable DALY product documentation.<\/p>\n

4. Separate Internal BMS Communication From Inverter Communication<\/p>\n\n\n\n\n\n
Communication link<\/th>\nPurpose<\/th>\nDALY 4th Gen architecture covered here<\/th>\n<\/tr>\n
BMS ↔ BMS<\/td>\nIdentify and connect BMS units inside the parallel battery system<\/td>\nInternal RS485<\/td>\n<\/tr>\n
Battery system ↔ Inverter<\/td>\nExchange battery information with a compatible inverter<\/td>\nCAN \/ RS485 with the applicable supported protocol<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

A CAN or RS485 interface alone does not establish inverter compatibility. The exact inverter model and required communication protocol must also match the selected BMS configuration.<\/p>\n

Customer rule: Interface compatibility and protocol compatibility are separate checks.<\/p>\n

5. Multi-Pack Communication Commissioning Checklist<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n
Check<\/th>\nWhat to confirm<\/th>\n<\/tr>\n
Pack architecture<\/td>\nHow many battery packs will operate in parallel?<\/td>\n<\/tr>\n
Pack-level BMS<\/td>\nIs each pack using the required BMS configuration?<\/td>\n<\/tr>\n
BMS identification<\/td>\nCan every BMS be identified correctly?<\/td>\n<\/tr>\n
Internal communication<\/td>\nIs the BMS-to-BMS RS485 communication path established?<\/td>\n<\/tr>\n
Communication topology<\/td>\nAre the BMS units linked according to the applicable product documentation?<\/td>\n<\/tr>\n
Main\/host communication point<\/td>\nWhich battery\/BMS connection communicates toward the inverter?<\/td>\n<\/tr>\n
Inverter model<\/td>\nWhat is the exact brand and model?<\/td>\n<\/tr>\n
Interface<\/td>\nDoes the project require CAN or RS485?<\/td>\n<\/tr>\n
Protocol<\/td>\nDoes the selected BMS configuration support the required inverter protocol?<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Complete these checks before treating the parallel battery bank as an integrated BMS communication system.<\/p>\n

6. What Does DALY 4th Gen Support for This Architecture?<\/p>\n\n\n\n\n\n\n\n\n
Function<\/th>\nSupported capability<\/th>\n<\/tr>\n
Parallel expansion<\/td>\nUp to 16 PACKs in the supported configuration<\/td>\n<\/tr>\n
BMS identification<\/td>\nAutomatic BMS address identification<\/td>\n<\/tr>\n
Internal multi-pack communication<\/td>\nRS485<\/td>\n<\/tr>\n
Multi-pack visibility<\/td>\nIndividual pack information can be viewed in supported monitoring interfaces<\/td>\n<\/tr>\n
Inverter-facing communication<\/td>\nCAN \/ RS485 with supported inverter protocols<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

For supported monitoring configurations, individual pack information can include pack number, operating state, voltage, current, SOC, charge MOS status, and discharge MOS status.<\/p>\n

This article stops at communication topology: who is identified, how the BMS units are linked, and how the battery system reaches the inverter interface.<\/p>\n

Next integration question: If you need to determine what multi-pack battery data the inverter receives—such as SOC, current, alarms, or other system-level information—verify the system-data behavior separately for the applicable BMS configuration and inverter protocol.<\/p>\n

FAQDoes each parallel battery pack need its own BMS?<\/p>\n

In the multi-pack architecture discussed here, yes: each battery pack is managed by its own BMS, while the communication architecture links the BMS units at system level.<\/p>\n

Does DALY 4th Gen use RS485 between parallel packs?<\/p>\n

In the DALY 4th Gen architecture covered here, internal parallel-pack BMS communication uses RS485. Do not generalize this to every DALY product or every energy storage architecture.<\/p>\n

If both the BMS and inverter have CAN, are they compatible?<\/p>\n

Not automatically. The physical interface, exact inverter model, communication protocol, and selected BMS configuration must be checked together.<\/p>\n

Request a Parallel BMS Communication Review<\/p>\n

For a multi-pack energy storage project, send DALY your battery chemistry, S count, capacity per pack, number of parallel packs, BMS current requirement, exact inverter brand\/model, required CAN\/RS485 interface, communication protocol, monitoring requirement, and expected quantity.<\/p>\n

This allows the technical team to verify the communication architecture before sample testing or commissioning.<\/p>\n

About US<\/p>\n

To become a leading global provider of new energy solutions, DALY BMS specializes in the manufacturing, distribution, design, research, and servicing of cutting-edge Lithium Battery Management Systems (BMS). With a presence spanning over 130 countries, including key markets like India, Russia, Turkey, Pakistan, Egypt, Argentina, Spain, the US, Germany, South Korea, and Japan, we cater to diverse energy needs worldwide.<\/p>\n

Media Contact<\/span>
Company Name:<\/strong> DALY BMS<\/a>
Contact Person:<\/strong> Media Relations
Email:<\/strong> Send Email<\/a>
Country:<\/strong> China
Website:<\/strong> https:\/\/www.dalybms.com\/<\/a><\/p>\n

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Dongguan City, Guangdong Province, China. – September 15,2026 Quick Answer: Power Connection and BMS Communication Are Different When several battery packs operate in parallel, connecting them on the DC power side does not automatically connect their BMS units on the … Continue reading →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[401,410,403,404,416],"tags":[],"class_list":["post-835837","post","type-post","status-publish","format-standard","hentry","category-Business","category-Manufacturing-Industry","category-UK","category-US","category-World"],"_links":{"self":[{"href":"https:\/\/www.abnewswire.com\/pressreleases\/wp-json\/wp\/v2\/posts\/835837","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.abnewswire.com\/pressreleases\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.abnewswire.com\/pressreleases\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.abnewswire.com\/pressreleases\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.abnewswire.com\/pressreleases\/wp-json\/wp\/v2\/comments?post=835837"}],"version-history":[{"count":0,"href":"https:\/\/www.abnewswire.com\/pressreleases\/wp-json\/wp\/v2\/posts\/835837\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.abnewswire.com\/pressreleases\/wp-json\/wp\/v2\/media?parent=835837"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.abnewswire.com\/pressreleases\/wp-json\/wp\/v2\/categories?post=835837"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.abnewswire.com\/pressreleases\/wp-json\/wp\/v2\/tags?post=835837"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}