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JK BMS 5A Parallel Module for JK BMS | Safe Battery Paralleling | LiFePO4 Oz - JK-BLMK-5A
JK-BLMK-5A Parallel Module (5A Current Limiter) for JK BMS
If you’re paralleling multiple JK BMS battery packs, this is the little module that prevents the big mistake: surge (inrush) current when you connect packs together.
What it does: Limits equalisation / inrush current between packs to ~5A so you can parallel safely.
Quick Benefits
- Protects BMS + wiring from connection surges
- Makes parallel expansion controlled and safer
- Ideal for scalable off-grid battery banks
- Designed for JK BMS models with parallel support
Why You Need a Parallel Module
When you connect two lithium packs in parallel, even a tiny voltage difference can create a large equalisation current. That surge can stress cells, busbars, connectors, and in some cases damage electronics.
The JK-BLMK-5A slows that down by limiting the current to roughly 5A, so the packs equalise safely.
Compatibility (Read This)
Important: This module only works with JK BMS models that support parallel communication. If your BMS does not have parallel support, this module won’t magically make it parallel-capable.
Common compatible example:
- JK-B2A8S30P-HC (and other JK models with the parallel interface)
If you’re not sure which JK model you have, message us the model number (or a photo of the label) and we’ll tell you.
Technical Overview
Current limiting: ~5A
Use case: Parallel battery packs safely
Works with: JK BMS with parallel comms
Installation Notes (Do It Properly)
- Bring packs to similar voltage before connecting in parallel.
- Use correct cable sizing, busbars and protection devices.
- Follow JK app settings for parallel-enabled systems.
- This module helps manage inrush current — it doesn’t replace good electrical design.
If you want us to sanity-check your parallel plan, send through your setup (voltage, number of packs, inverter model). We’d rather you do it once and do it right.
Why Buy From LiFePO4 Oz?
- Australian family-owned
- We build real off-grid systems — not just sell parts
- Practical support from people who understand JK BMS setups
- Designed for DIY builders who want long-term reliability
FAQ
Can I parallel packs without this module?
Will this work with any JK BMS?
What should I do if I’m unsure about compatibility?
Note: Specs and compatibility depend on your JK BMS model and system design. If you're building a parallel bank, ensure correct protection, cable sizing and safe commissioning practices.
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We aim to sell high quality products but as with life it doesn't always go to plan. As such if you receive a product which does not work as describe you need to let us know within 30 days to receive a replacement product. You must be able to describe and/or show us through a recorded video that it's not working as it should. We will then work to have the product returned and replaced or refunded. If you change your mind after purchase then we will accept returns ONLY once the item has been returned to us at your cost and in original condition.
All orders will be safely packed and shipped within 1 day. All products are shipped via Road Freight only.
All efforts are made to ensure the products safe during transport, however if you receive an item which looks like it may have been damaged during tranport you must take a photo before trying to use the product.
Shipping
All orders are shipped via Road Freight. As such there is not Express Shipping available.
RETURNS
We aim to keep our customers happy and if you are unhappy with your items due to them being damaged or not as described, simply return them for a refund. A 20% restocking fee will apply.
Top Quality Goods
Our aim is to provide high-quality products at an affordable price. If you receive a product that is damaged, do not use the item. Please inform us within 24 hours of receiving that product. We will replace the product as soon as possible without any charges.
REFUNDS
A refund will be provided if you have purchased an item that does not operate as described. Once we have verified you claims we will offer a refund and pay for the return freight cost.
