JK-DZ11B2A24S 2S-24S 2A Active Balancer

• JK-B2A8S

  2 A constant active balancer for 2S–8S packs, Bluetooth app, RS485/CAN optional.

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• JK-B2A16S

  2 A constant active balancer for 2S–16S packs, Bluetooth app, RS485/CAN optional.

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• JK-DZ08B2A24S

  2 A constant active balancer for 2S–24S packs, cascade support, Bluetooth app, CAN built in, RS485 optional.

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How much balancing current does the JK-DZ11B2A24S deliver?

The JK-DZ11B2A24S moves up to 2 A between cells while balancing, on packs from 2S to 24S Li-ion. How long it takes to level a pack depends on how far apart the cells are, not on pack capacity alone: a large imbalance on a large pack is what higher balance current is for.

Which battery packs can the JK-DZ11B2A24S work with?

JK-DZ11B2A24S is documented for 2S–24S Li-ion, 2S–24S LiFePO4, 2S–24S LTO, 2S–24S Lead-acid. Both ends of that range are hard boundaries: below the minimum the board cannot read a valid pack, and above the maximum the cell-sense inputs are over their rating. At the top of the range a 24S Li-ion pack sits near 101 V when fully charged, so check the charger output as well as the cell count.

What can I connect to the JK-DZ11B2A24S?

Communication on the JK-DZ11B2A24S: BLE, RS485, CAN (optional). Anything marked optional is not fitted as standard — if your inverter or monitoring system needs that bus, order it with the board instead of assuming it is there. Cell voltages and settings are readable over Bluetooth from the phone app.

How do I read a JK BMS model number?

A model string such as "B2A24S20P" encodes four things. "B2A" means a 2A active balancer (B1A = 1A). "24S" is the maximum series count the board is built for. "20P" is the current class, where 20 corresponds to 200A continuous discharge (10 = 100A, 15 = 150A, 30 = 300A). An "RP" suffix indicates the relay version with a separate port. This is a naming convention only — always confirm the actual rating on the specification table of the specific model, because a board can support a range of series counts below its maximum.

How much balance current do I actually need?

It depends on pack size and how mismatched the cells are. A larger pack has more cells to keep aligned and benefits from more balance current; a small pack rarely needs more than 1A. Higher balance current also means more heat and a larger board. If your cells are well matched and new, a 1A balancer is usually enough; if you are reviving an older pack with drift, 2A or more is worth it.

What is the difference between a BMS and an active balancer?

A BMS protects the pack: it cuts charge and discharge on over-voltage, under-voltage, over-current and over-temperature, and it reports cell data over Bluetooth or a wired bus. An active balancer only moves energy between cells to keep them at the same voltage. A BMS is required for safety; a balancer is an optimisation. Some JK boards combine both in one unit, which is why the model string contains a balance current (B1A, B2A) as well as a current class.

Can one BMS work with LiFePO4, Li-ion and LTO batteries?

Only if the chemistry is explicitly listed for that model. The three chemistries have different voltage windows per cell, so the protection thresholds differ. A board that supports all three selects the profile in the app; a board that supports only LiFePO4 will either refuse to start or apply the wrong cut-offs on a Li-ion pack. Never assume compatibility — check the chemistry field on the specification table.

What does common-port and separate-port mean on a BMS?

On a common-port (same-port) BMS, charging and discharging share one terminal pair. On a separate-port BMS, charge and discharge have their own paths, so the charge current can be limited independently — common on relay-based boards. Common-port is simpler to wire and is what most home storage builds use; separate-port matters when charge current must be much lower than discharge current.

• Active vs passive balancing: where the energy goesPassive balancing turns excess into heat. Active balancing moves it to another cell. The difference matters more at low state of charge than at high.
• Chemistry decides the settings, not the boardThe same BMS on LiFePO4 and on NMC needs completely different voltage thresholds. Using one profile on the other chemistry damages cells quietly.