SYSTEM NOTES
Three shapes, and the constraint that decides each one
Projects that come through here are nearly always one of three: a pack behind a home inverter, a link between a BMS and something that has to act on what it reports, or a cabinet sized against a demand bill. Each has one constraint that settles most of the rest.
Find the constraint before the parts list
A home pack is decided by four numbers that have to agree, two of which come from the inverter rather than the battery. An inverter link is decided by a protocol revision, which is a property of two firmware versions and not of two brand names. A C&I cabinet is decided by the tariff, which sets kW and kWh independently and rules on whether the project is worth building at all.
Get that one right and the hardware follows quickly. Get it wrong and no amount of comparing boards, cables or enclosures converges, because the shortlist was drawn against the wrong requirement.
SYSTEM NOTES
Three system shapes, worked end to end
Four numbers, then a build order
Series count, charge voltage, continuous current and protocol have to agree first. After that a home pack is a sequence where the order genuinely matters.
Open the noteINVERTER LINKGetting a BMS and an inverter to agree
Confirm the protocol revision before the hardware, isolate a silent link from the pack outward, and know what a fully working link should be doing.
Open the noteC&I CABINETSizing a cabinet against the demand bill
kW and kWh are separate answers and the tariff decides both. Then cooling, grid equipment and fire strategy follow in an order that resists reworking.
Open the noteENGINEERING NOTES
Settle the decision, then pick the part
Check a JKBMS source
Check a JKBMS listing against what a reseller cannot restate: the four segments of the model code, the version the board reports itself, the visible port set, and a quotation that names its own exclusions.
Read guideNAME TO PARTFrom brand name to part
All four spellings return the same hardware, so none of them narrows anything. This maps the term you searched to the artefact you were actually after: a model code, a manual, a firmware note or a cable.
Read guideORDERINGHow ordering works
Two order paths run on this catalog. Work out which one a product uses, what shipping costs to your destination, which currency you will be charged in, and what has to be fixed before payment.
Read guideENCLOSURE DOCSBattery box documents
Find the JKESS enclosure document that matches the format you were shipped, and work out the four cell measurements an enclosure manual assumes you already checked.
Read guidePEAK SHAVINGSizing peak shaving
Work peak shaving out of interval data: find the billing demand window, measure the energy above the threshold, size kW and kWh separately, and stop the recharge from setting the next peak.
Read guideTHERMALAir or liquid cooling
Estimate what a battery cabinet actually has to reject, judge the design on cell-to-cell temperature spread rather than average temperature, and price in what each cooling system costs to keep working.
Read guideBMS ARCHITECTUREWhat a BMU is
BMU means different things in different datasheets. Establish what a specific controller does from its I/O list, count units from channels rather than from kWh, and find where the interlock loop really terminates.
Read guideSOURCINGComparing ESS quotes
Normalise C&I ESS quotations before comparing price: usable against nameplate energy, what the warranty actually measures, the line items that fall outside the scope, and who owns the integration boundary.
Read guideAPP AND BLUETOOTHJKBMS app and Bluetooth
Connect the JKBMS app over Bluetooth, understand pairing behaviour and permissions, and work through the connection failures reported most often.
Read guideRS485 AND CAN WIRINGJK BMS RS485 and CAN wiring
Identify the RS485 and CAN ports on a JK BMS, verify the pinout against the manual for your model, and avoid the wiring mistakes that damage a port.
Read guideFIRMWARE AND PARAMETERSJKBMS firmware and parameters
Understand how JKBMS firmware versions affect available parameters, what to record before changing settings, and how to avoid an unrecoverable configuration.
Read guideFAMILY TABLEBD, PB, B1A and B2A side by side
One table showing what each family is built around, so a shortlist takes a minute instead of a browse.
Read guideENCLOSURE FITFitting cells into an enclosure kit
Measure the cells before shortlisting a box: stack length with compression, height over the terminals, mass and rack loading.
Read guideBOARD SELECTIONNarrowing the catalog to one code
Work from the pack and the inverter rating down to a handful of codes instead of browsing the list.
Read guideBD OR PBWhich family the project needs
Local monitoring or an inverter protocol link. That question decides the family before anything else does.
Read guideBALANCE CURRENTHow much balancing a pack needs
Balance current is a rate. Match it to how fast the pack drifts and how much idle time it has to recover.
Read guideBUS CHOICECAN or RS485 for the link
The device at the far end decides the bus. Confirm pinout, bitrate and protocol profile before buying a cable.
Read guideHIGH-VOLTAGEWhere contactor authority sits
Split responsibilities between module slaves and the cluster master, and find what nothing in the design owns yet.
Read guidePROJECT INPUTSWhat to fix before requesting a cabinet quote
The decisions that have to be settled first, and the ones that can safely stay open until the design review.
Read guideGet in Touch
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