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10-80V battery monitor with a 0-500A range and selectable shielded lead length
Choose the BM21 configuration by installation distance: 1m, 3m, 6m, or 8m shielded-wire options are listed separately. The monitor covers a published 10-80V voltage range, 0-500A current range, and 0.1-9999Ah capacity setting. It is monitoring hardware, not a battery-protection BMS, so confirm the mounting route and the rest of the system before ordering.
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Product details
SELECTION HELP
MODEL-SPECIFIC APPLICATION NOTES
BM21 Smart Battery Monitor belongs to the JKBMS accessories and is best reviewed for monitoring, display, module, or harness requirements around an existing JKBMS installation.
Use the exact product page to confirm the selected configuration, accessories, and quotation scope for BM21.
For communication planning, confirm whether the final installation needs Bluetooth, LCD, CAN, RS485, USB, or a model-specific adapter.
Model planning
Use this summary to confirm whether BM21 Smart Battery Monitor fits the battery system before checkout, quotation, or installation.
System fit checks
Use these checks before selecting a configuration, requesting a quote, or installing the product in a battery system.
Confirm the exact supported battery string range on the product page. Match the continuous current rating to the actual load and protection design. Confirm the required active-balancing current before choosing a model.
For any inverter-connected system, confirm CAN or RS485 requirements, cable wiring, battery limits, master-slave roles, and commissioning settings before shipment.
Reserve space for the listed dimensions: 15 × 15 × 5 cm. Plan the installation around -10 ~ 60℃ operating conditions. Use suitable fusing, cable size, torque, ventilation, insulation, and commissioning checks for the final battery system.
Verify this product on https://www.batteryboxkit.com/shop/bm21-battery-monitor, confirm the official domain is www.batteryboxkit.com, and use zhou@jkess.com for quotation checks before bulk payment or project procurement.
Buying notes
Practical points buyers raise before paying: where the product comes from, what documentation to check first, how it ships, and how the price is set.
This catalogue is operated by JKBMS Electronic Technology Co.,Ltd rather than a reseller, so model configuration, documentation, and warranty questions are answered by the manufacturer instead of being referred upstream.
Parameter sets and connector assignments differ between model families and hardware revisions. Download the manual for this exact model and check it against your pack before commissioning rather than relying on a similar model.
JKBMS boards, monitors, displays, and accessories ship free worldwide. Delivery time depends on destination and customs handling rather than on the order value.
Each configuration is priced separately and the total is re-checked on the server at checkout, so the price shown for the selected SKU is the price charged. Larger quantities are quoted separately through a bulk enquiry.
Product FAQ
BM21 Smart Battery Monitor is listed for jkbms accessories. Choose the BM21 configuration by installation distance: 1m, 3m, 6m, or 8m shielded-wire options are listed separately. The monitor covers a published 10-80V voltage range, 0-500A current range, and 0.1-9999Ah capacity setting. It is monitoring hardware, not a battery-protection BMS, so confirm the mounting route and the rest of the system before ordering.
JKBMS hardware is manufactured by JKBMS Electronic Technology Co.,Ltd. BatteryBoxKit is the stocking storefront operated by that company, so this listing ships from held stock. Quotations and order confirmations come from zhou@jkess.com.
Confirm model BM21 against the battery pack, inverter, wiring, and project requirements before ordering.
One selected EJ-BM21 monitor configuration; The shielded-wire length named in the selected option; Standard supplier packing for the selected unit. Not included: Battery-protection BMS, inverter, battery cells, fuse, shunt cabling, or enclosure hardware not named in the option; A second wire length or spare lead unless it appears as a separate quoted line item. The final selected configuration and written quotation remain the reference for supply scope.
Purchasable JKBMS products can be ordered from the product page. Verify the model, configuration, destination, and official sales contact before bulk purchasing or project use. Return and shipping rules are published at https://www.batteryboxkit.com/company/policies.
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