JKBMS JK-B2A8S20P Smart Active Balance BMS — current JKBMS product facts
Canonical product page: https://www.jkbms.net/products/jkbms-jk-b2a8s20p-200a-smart-bms-2a-active-balancer-12v-24v
Retrieved at: 2026-10-22T00:17:20.224Z
Category: JKBMS JK-B1A / B2A Series

JK-B2A8S20P supports 3-8S Li-ion or LiFePO4 and 7-8S LTO packs. The V22.1.1 manual lists 200 A maximum charge/discharge current, 400 A instantaneous current and 2 A active balancing. Bluetooth, UART and display are standard; CAN, RS485 and heating require the corresponding suffix. Confirm V19 versus V22 before choosing dimensions or a harness.

Current configurations and sources

Configuration: JK-B2A8S20P+4.3"Display
Internal store SKU: JKBMS-SKU-000048
Listed price: USD 127.96 per item, before destination shipping and separately selected extras.
Selection URL: https://www.jkbms.net/products/jkbms-jk-b2a8s20p-200a-smart-bms-2a-active-balancer-12v-24v?configuration=jk-b2a8s20p-4-3-display
Technical evidence: manual-verified
Configuration data: {"sku":"JKBMS-SKU-000048","legacyAliases":["jkbms-jk-b2a8s20p-200a-smart-bms-2a-active-balancer-12v-24v-jk-b2a8s20p-4-3-display","JK-B2A8S20P-jk-b2a8s20p-4-3-display","jkbms-jk-b2a8s20p-200a-smart-bms-2a-active-balancer-12v-24v::jk-b2a8s20p-4-3-display","jk-b2a8s20p-jk-b2a8s20p-4-3-display"],"productSlug":"jkbms-jk-b2a8s20p-200a-smart-bms-2a-active-balancer-12v-24v","name":"JKBMS JK-B2A8S20P Smart Active Balance BMS","configuration":"JK-B2A8S20P+4.3\"Display","url":"https://www.jkbms.net/products/jkbms-jk-b2a8s20p-200a-smart-bms-2a-active-balancer-12v-24v?configuration=jk-b2a8s20p-4-3-display","productFamilyUrl":"https://www.jkbms.net/products/jkbms-jk-b2a8s20p-200a-smart-bms-2a-active-balancer-12v-24v","currency":"USD","priceCents":12796,"maximumQuantity":999,"inventory":{"status":"not-verified","poolId":"JKBMS-SKU-000048","scope":"sku","source":"No current verified inventory snapshot is available.","sourceKind":null,"physicalQuantity":null,"availableQuantity":null,"lastInventoryVerifiedAt":null,"validUntil":null,"checkoutListed":true,"realtime":false,"reservationStatus":"not-reserved","availability":"unknown"},"image":{"url":"https://www.jkbms.net/images/jkbms-ice-blue/asset-228-7a4c15019d.webp","scope":"product-family","exactSkuAppearanceVerified":false},"description":"JK-B2A8S20P. Battery chemistry / strings: Li-ion (ternary/NMC): 3-8S; LiFePO4 (LFP): 3-8S; Lithium titanate (LTO): 7-8S; Maximum discharge (not continuous): 200 A; Continuous current (catalog): 200 A; duty limits require confirmation; Active balance: 2 A; Documented standard interfaces: Bluetooth, UART, display interface. Confirm shipped revision, connectors and harness.","included":["Selected JKBMS smart BMS model or display bundle","Model-specific wiring harness and standard accessories supplied with the product","Documentation or setup references supplied with the selected package"],"notIncluded":["Battery cells, battery enclosure, inverter, charger, and external power cabling","External contactors, breakers, fuses, and installation hardware unless specified","Onsite installation, commissioning, firmware setup, or inverter configuration service"],"packageContentsScope":"Product family; selected configuration determines which listed components apply.","technical":{"status":"manual-verified","selectedModel":"JK-B2A8S20P","documentedAt":"2026-08-03","batteryCompatibility":[{"chemistry":"Li-ion (ternary/NMC)","minSeries":3,"maxSeries":8},{"chemistry":"LiFePO4 (LFP)","minSeries":3,"maxSeries":8},{"chemistry":"Lithium titanate (LTO)","minSeries":7,"maxSeries":8}],"current":{"maximumChargeA":200,"maximumDischargeA":200,"instantaneousA":400,"qualification":"Manual maximum values are not a substitute for cable, terminal, fuse and thermal design."},"balanceCurrentA":2,"communication":{"standard":["Bluetooth","UART","display interface"],"optional":["CAN","RS485","heating control"],"notes":["CAN, RS485 and heating are suffix-dependent; they are not universal features of the base SKU.","V19 and V22 connector layouts and harness definitions must be checked separately."]},"revisionNotes":["The available documents do not establish that V22 replaces every V19 unit.","Do not select a communication harness from connector appearance alone.","The 7.5-36 V supply, up to 1.3 W operating power and V22 mechanical data apply to V22.1.1."],"manuals":[{"title":"JK-BxA8S-20P Product Specification (includes JK-B2A8S-20P)","version":"V22.1.1","pages":"8-9, 16, 20-23","href":"https://github.com/bigelephant-code/jkbms-downloads/releases/download/manuals-2026.08/JK-B2A8S-20P-User-Manual-V22.1.1.pdf"},{"title":"JK-BxA8S-20P Product Specification (includes JK-B2A8S-20P)","version":"V19.2.1","pages":"8-9, 16, 20-23","href":"https://github.com/bigelephant-code/jkbms-downloads/releases/download/manuals-2026.07/JK-B2A8S-20P-User-Manual-V19.2.1.pdf"}]},"purchaseFacts":{"kind":"bms","productPageUrl":"https://www.jkbms.net/products/jkbms-jk-b2a8s20p-200a-smart-bms-2a-active-balancer-12v-24v?configuration=jk-b2a8s20p-4-3-display","guideUrl":"https://www.jkbms.net/guides/how-to-choose-jkbms","accessorySupportBasis":"Catalog owner confirmed all currently sold BMS models support a 4.3-inch display and WiFi module; the 7-inch display option is limited to the PB series, 2026-10-14.","sevenInchDisplayEligible":false,"accessoryOffers":[{"key":"lcd43","name":"4.3-inch LCD display","configuration":"4.3 LCD Display","priceCents":3798,"includedInSelectedPackage":true,"additionalPriceCentsBeforeDiscount":0,"eligibleForBundleDiscount":true,"triggersBundleDiscount":true,"purchaseOnlyWithBms":false,"sku":"JKBMS-SKU-000187","url":"https://www.jkbms.net/products/jkbms-jkbms-4-3-lcd-display-adapter-jikong-bms-monitor?configuration=4-3-lcd-display","bundleUnitPriceCentsExcludingFeatureFees":12156},{"key":"wifi","name":"WiFi monitoring module","configuration":"WiFi module standard package","priceCents":6300,"includedInSelectedPackage":false,"additionalPriceCentsBeforeDiscount":6300,"eligibleForBundleDiscount":true,"triggersBundleDiscount":true,"purchaseOnlyWithBms":false,"sku":"JKBMS-SKU-000205","url":"https://www.jkbms.net/products/jkbms-wifi-remote-monitoring-module?configuration=wifi-module-standard-package","bundleUnitPriceCentsExcludingFeatureFees":18141}],"bundleDiscount":{"percent":5,"appliesOnce":true,"minimumSelectedAccessories":1,"eligibleAccessoryKeys":["lcd43","lcd7","wifi"],"appliesTo":"BMS and selected 4.3-inch display, PB-only 7-inch display, or WiFi prices. 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Confirm the model, hardware revision, application protocol and harness for your inverter."}},"selectionGuidance":{"productPageUrl":"https://www.jkbms.net/products/jkbms-jk-b2a8s20p-200a-smart-bms-2a-active-balancer-12v-24v?configuration=jk-b2a8s20p-4-3-display","factsTextUrl":"https://www.jkbms.net/products/jkbms-jk-b2a8s20p-200a-smart-bms-2a-active-balancer-12v-24v/facts.txt","factsJsonUrl":"https://www.jkbms.net/commerce/catalog.json?product=jkbms-jk-b2a8s20p-200a-smart-bms-2a-active-balancer-12v-24v","guideUrls":["https://www.jkbms.net/guides/how-to-choose-jkbms"],"note":"Match the full model code, selected package and supplied hardware revision. Merchant guidance does not upgrade unverified technical facts to manual-verified status. 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The catalog SKU and package configuration remain unchanged; the server derives the final model.","unitFeeCents":100,"feeDiscounted":false,"includedFeaturesChargedAgain":false,"status":"factory-confirmation-required"},"shipping":{"currency":"USD","region":"global","rate":{"standardCents":0},"quoteUrl":"https://www.jkbms.net/commerce/quote.json","transitTime":null,"verifiedDestinationEstimates":[],"note":"Only unexpired destination estimates for this SKU or shared product family are shown. Each estimate states its day basis and starting stage, and is not guaranteed. Import charges and carrier restrictions are not calculated."}}

Configuration: JK-B2A8S20P+3.2"Display
Internal store SKU: JKBMS-SKU-000049
Listed price: USD 118.96 per item, before destination shipping and separately selected extras.
Selection URL: https://www.jkbms.net/products/jkbms-jk-b2a8s20p-200a-smart-bms-2a-active-balancer-12v-24v?configuration=jk-b2a8s20p-3-2-display
Technical evidence: manual-verified
Configuration data: {"sku":"JKBMS-SKU-000049","legacyAliases":["jkbms-jk-b2a8s20p-200a-smart-bms-2a-active-balancer-12v-24v-jk-b2a8s20p-3-2-display","JK-B2A8S20P-jk-b2a8s20p-3-2-display","jkbms-jk-b2a8s20p-200a-smart-bms-2a-active-balancer-12v-24v::jk-b2a8s20p-3-2-display","jk-b2a8s20p-jk-b2a8s20p-3-2-display"],"productSlug":"jkbms-jk-b2a8s20p-200a-smart-bms-2a-active-balancer-12v-24v","name":"JKBMS JK-B2A8S20P Smart Active Balance BMS","configuration":"JK-B2A8S20P+3.2\"Display","url":"https://www.jkbms.net/products/jkbms-jk-b2a8s20p-200a-smart-bms-2a-active-balancer-12v-24v?configuration=jk-b2a8s20p-3-2-display","productFamilyUrl":"https://www.jkbms.net/products/jkbms-jk-b2a8s20p-200a-smart-bms-2a-active-balancer-12v-24v","currency":"USD","priceCents":11896,"maximumQuantity":999,"inventory":{"status":"not-verified","poolId":"JKBMS-SKU-000049","scope":"sku","source":"No current verified inventory snapshot is available.","sourceKind":null,"physicalQuantity":null,"availableQuantity":null,"lastInventoryVerifiedAt":null,"validUntil":null,"checkoutListed":true,"realtime":false,"reservationStatus":"not-reserved","availability":"unknown"},"image":{"url":"https://www.jkbms.net/images/jkbms-ice-blue/asset-228-7a4c15019d.webp","scope":"product-family","exactSkuAppearanceVerified":false},"description":"JK-B2A8S20P. Battery chemistry / strings: Li-ion (ternary/NMC): 3-8S; LiFePO4 (LFP): 3-8S; Lithium titanate (LTO): 7-8S; Maximum discharge (not continuous): 200 A; Continuous current (catalog): 200 A; duty limits require confirmation; Active balance: 2 A; Documented standard interfaces: Bluetooth, UART, display interface. 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Confirm the model, hardware revision, application protocol and harness for your inverter."}},"selectionGuidance":{"productPageUrl":"https://www.jkbms.net/products/jkbms-jk-b2a8s20p-200a-smart-bms-2a-active-balancer-12v-24v?configuration=jk-b2a8s20p-3-2-display","factsTextUrl":"https://www.jkbms.net/products/jkbms-jk-b2a8s20p-200a-smart-bms-2a-active-balancer-12v-24v/facts.txt","factsJsonUrl":"https://www.jkbms.net/commerce/catalog.json?product=jkbms-jk-b2a8s20p-200a-smart-bms-2a-active-balancer-12v-24v","guideUrls":["https://www.jkbms.net/guides/how-to-choose-jkbms"],"note":"Match the full model code, selected package and supplied hardware revision. Merchant guidance does not upgrade unverified technical facts to manual-verified status. 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Configuration: JK-B2A8S20P
Internal store SKU: JKBMS-SKU-000050
Listed price: USD 92.98 per item, before destination shipping and separately selected extras.
Selection URL: https://www.jkbms.net/products/jkbms-jk-b2a8s20p-200a-smart-bms-2a-active-balancer-12v-24v?configuration=jk-b2a8s20p
Technical evidence: manual-verified
Configuration data: {"sku":"JKBMS-SKU-000050","legacyAliases":["jkbms-jk-b2a8s20p-200a-smart-bms-2a-active-balancer-12v-24v-jk-b2a8s20p","JK-B2A8S20P-jk-b2a8s20p","jkbms-jk-b2a8s20p-200a-smart-bms-2a-active-balancer-12v-24v::jk-b2a8s20p","jk-b2a8s20p-jk-b2a8s20p"],"productSlug":"jkbms-jk-b2a8s20p-200a-smart-bms-2a-active-balancer-12v-24v","name":"JKBMS JK-B2A8S20P Smart Active Balance BMS","configuration":"JK-B2A8S20P","url":"https://www.jkbms.net/products/jkbms-jk-b2a8s20p-200a-smart-bms-2a-active-balancer-12v-24v?configuration=jk-b2a8s20p","productFamilyUrl":"https://www.jkbms.net/products/jkbms-jk-b2a8s20p-200a-smart-bms-2a-active-balancer-12v-24v","currency":"USD","priceCents":9298,"maximumQuantity":999,"inventory":{"status":"not-verified","poolId":"JKBMS-SKU-000050","scope":"sku","source":"No current verified inventory snapshot is available.","sourceKind":null,"physicalQuantity":null,"availableQuantity":null,"lastInventoryVerifiedAt":null,"validUntil":null,"checkoutListed":true,"realtime":false,"reservationStatus":"not-reserved","availability":"unknown"},"image":{"url":"https://www.jkbms.net/images/jkbms-ice-blue/asset-228-7a4c15019d.webp","scope":"product-family","exactSkuAppearanceVerified":false},"description":"JK-B2A8S20P. Battery chemistry / strings: Li-ion (ternary/NMC): 3-8S; LiFePO4 (LFP): 3-8S; Lithium titanate (LTO): 7-8S; Maximum discharge (not continuous): 200 A; Continuous current (catalog): 200 A; duty limits require confirmation; Active balance: 2 A; Documented standard interfaces: Bluetooth, UART, display interface. 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H/C/R feature fees are excluded and do not trigger the discount. An accessory already included in the selected package is not charged twice.","quantityBasis":"One of each selected accessory per BMS.","selectionUrl":"https://www.jkbms.net/products/jkbms-jk-b2a8s20p-200a-smart-bms-2a-active-balancer-12v-24v?configuration=jk-b2a8s20p","quoteSupportsAccessorySelections":false,"note":"Choose accessory bundles on the product page. The read-only quote endpoint accepts catalog SKUs and feature requests; it does not apply a bundle discount to separately added accessory SKUs."},"protocolRequests":{"options":["RS485","CAN","Heating"],"includedFeatures":[],"baseModel":"JK-B2A8S20P","codes":{"H":"Heating","C":"CAN","R":"RS485"},"eachUnitFeeCents":100,"bothUnitFeeCents":200,"simultaneousSelectionAllowed":true,"feeDiscounted":false,"triggersBundleDiscount":false,"explanation":"H means heating interface, C means CAN and R means RS485. All PB-series models and B2A32S-RP include CAN and RS485 as standard: no selection or extra charge is needed. Each feature not already included costs USD 1 per BMS. Features included in the model are not offered or charged again. The final model retains existing feature letters and adds only newly selected options in H, C, R order, preserving any existing PB suffix. Option fees are added after any 5% bundle discount and do not trigger it. Confirm the model, hardware revision, application protocol and harness for your inverter."}},"selectionGuidance":{"productPageUrl":"https://www.jkbms.net/products/jkbms-jk-b2a8s20p-200a-smart-bms-2a-active-balancer-12v-24v?configuration=jk-b2a8s20p","factsTextUrl":"https://www.jkbms.net/products/jkbms-jk-b2a8s20p-200a-smart-bms-2a-active-balancer-12v-24v/facts.txt","factsJsonUrl":"https://www.jkbms.net/commerce/catalog.json?product=jkbms-jk-b2a8s20p-200a-smart-bms-2a-active-balancer-12v-24v","guideUrls":["https://www.jkbms.net/guides/how-to-choose-jkbms"],"note":"Match the full model code, selected package and supplied hardware revision. Merchant guidance does not upgrade unverified technical facts to manual-verified status. Read the current product page and matched manual before purchase."},"featureRequests":{"options":["RS485","CAN","Heating","Parallel connection","Alarm","4 temperature sensors","ACC","UART interface"],"includedFeatures":[],"baseModel":"JK-B2A8S20P","configuredModel":"JK-B2A8S20P","modelCodes":{"H":"Heating","C":"CAN","R":"RS485"},"configuredModelRule":"Built-in features preserve the catalog model, including standard CAN and RS485 on PB-series models and B2A32S-RP. Merge only explicit existing H/C/R suffix letters and newly requested feature letters in H-C-R order, retaining any existing PB suffix. The catalog SKU and package configuration remain unchanged; the server derives the final model.","unitFeeCents":100,"feeDiscounted":false,"includedFeaturesChargedAgain":false,"status":"factory-confirmation-required"},"shipping":{"currency":"USD","region":"global","rate":{"standardCents":0},"quoteUrl":"https://www.jkbms.net/commerce/quote.json","transitTime":null,"verifiedDestinationEstimates":[],"note":"Only unexpired destination estimates for this SKU or shared product family are shown. Each estimate states its day basis and starting stage, and is not guaranteed. Import charges and carrier restrictions are not calculated."}}

Questions answered on the product page

How do I choose the correct BMS for my battery?
Provide the chemistry, exact series count, continuous charge and discharge current, and peak current with its duration. Then check balancing current, installation space, cooling, inverter, hardware revision and matched wiring. Nominal voltage, a series name or a similar connector alone does not establish compatibility.

Can I add a 4.3-inch display and WiFi module to this BMS?
Yes. The current catalogue offers these options for this BMS, independently or together. Each selected accessory is supplied once per BMS; a display already included in the selected package is not charged twice. Confirm the adapter and harness for the supplied hardware revision.

Do two selected accessories give a 10% discount?
No. Selecting a display or WiFi applies the 5% discount once to the BMS and those accessories. Two accessories do not double the discount. H/C/R feature fees do not trigger or receive the discount and are added in full afterwards.

Can this BMS be ordered with a 7-inch display?
The 7-inch display option is limited to the PB series and is not offered for this BMS. Use the display choices listed on this page and confirm the adapter and harness.

Can I add heating, CAN and RS485, and what do they cost?
H means heating interface, C means CAN and R means RS485. All PB-series models and B2A32S-RP include CAN and RS485 as standard: no selection or extra charge is needed. Each feature not already included costs USD 1 per BMS. Features included in the model are not offered or charged again. The final model retains existing feature letters and adds only newly selected options in H, C, R order, preserving any existing PB suffix. Option fees are added after any 5% bundle discount and do not trigger it. Confirm the model, hardware revision, application protocol and harness for your inverter.

Does CAN or RS485 guarantee compatibility with my inverter?
No. Confirm the exact inverter and BMS models, hardware revision, application protocol, firmware, pinout, cable and settings. A website selection or a matching connector does not prove that the two devices can communicate.

Is JK-B2A8S20P a 3S-8S or 4S-8S BMS?
The V22.1.1 manual specifies 3-8S for ternary/NMC lithium and LiFePO4, and 7-8S for LTO. The previous generic 4-8S wording did not describe the chemistry-specific limits accurately.

Are CAN, RS485 and heating included on the base JK-B2A8S20P?
No. Bluetooth, UART and the display interface are standard on the V22 base configuration. CAN, RS485 and heating depend on the ordered C, R and H suffix combination.

What is the difference between JK-B2A8S20P V19 and V22?
The revisions use different enclosure sizes, weights, interfaces and wiring. V22 is 160 × 80.78 × 15.1 mm and 358 g; V19 is 152.25 × 127.26 × 15.6 mm and 424 g. Match the manual and harness to the label.

Can a V19 cable or harness be used on V22?
Do not assume compatibility. Verify the connector designation and pinout in the manual that matches the shipped hardware revision before wiring.

Before purchase
- Prices and availability are retrieved from the current published store data. Recheck the selected package and destination before payment. Inventory snapshots are not stock reservations.
- Technical evidence is configuration-specific. A merchant-confirmed current-batch fact is not an exact-model manual, and a nearby model does not establish compatibility.
- Product-family photographs do not verify exact SKU appearance. Internal store SKUs are not GTIN or EAN barcodes.
- Purchases complete on the JKBMS website. This document does not establish any AI-platform approval, formal feed distribution or native payment integration.

Current JSON: https://www.jkbms.net/commerce/catalog.json?product=jkbms-jk-b2a8s20p-200a-smart-bms-2a-active-balancer-12v-24v
Purchase policies: https://www.jkbms.net/policies
Model and revision confirmation: https://www.jkbms.net/contact