WARNING: Please remember that basic knowledge of electronic circuits and batteries is needed to build a battery pack and attach a BMS. The Batrium BMS is not a plug-and-play device.
Answering several questions will allow the determination of what the BMS is required to handle. Since the BMS is there to integrate between several systems, these need to be outlined within your application to make sure you have the correct components to provide the necessary protection and operating functionality.
Here is a guide on how you can outline your hardware requirements:
What type of cell are you planning to use to make a battery pack?
Sample battery packs
Manufacturer and Model
Packaging format (
18650, 26650, Pouch, Prismatic, others) Chemistry and Nominal Voltage
(LiFePO4, Li-ion, LTO) Cell Capacity (
typically in Ah) If known, operating voltage range Min / Max
If known, the operating temperature range Min / Max
New / Recycled Cells
If recycled: What was their original application (i.e. Vehicle, Laptop, etc.)
Age, shelf life when fabricated
Kilometres travelled, to indicate the accumulated kWh Charge/Discharge thus far.
How do you plan to configure the cells into a Pack?
Number of cell strings
Number of cells in series
Number of cells in parallel
Proposed cell monitors if known to this configuration
Do you have individual cell fusing?
What is the cell string fusing rating?
With several strings, what is each string protection rating?
What Charger / Inverter are you connecting your batteries to?
Sample inverters/chargers available in the market today
Manufacturer / Model of Charger
Manufacturer / Model of Load / Discharge of Inverter
Is the Charger / Inverter integrated into one (1) unit or separate components?
Does the Charger have a Communication Port? If so, do you have the Communication Protocol that is used?
Does the Load / Discharge equipment (i.e. inverter) have a Communication Port? If so do you have the Communication Protocol that is used?
Peak Charging / Discharge Currents
Continuous Charging / Discharge Currents
Peak Voltage that will be measured from the Battery Pack
What is the minimum voltage required to run the inverter/charger?
Will this be directly linked to a vehicle alternator (or Dynamo)?
State of Charge (Fuel Gauge) helps determine the operating condition and requires additional Shunt hardware.
Image of the Batrium ShuntMon
Peak Charging / Discharge Current
Continuous Charging / Discharge Current
Peak Voltage that will be Measured from the Battery Pack
Where in the Circuit will the Shunt be Installed (Typically near the Negative Terminal)
Sample circuit breakers available in the market today
Will you be using a
circuit breaker? If using a
circuit breaker to the battery, will this have a remote trip function? What is the
rated current for the circuit breaker (dual pole positive/negative)? Are there
contactors/relays to protect the battery if required?
Mechanical Disconnect, of which there are several types — Momentary (trigger) / or Latching (pulse), Latching Contactor or Normal Contactor? Accessory Coil Voltage 5v / 12v / 24v / 48v? or other
Is there a need for the
Precharge Circuit? Are there any
Permanent Accessory Circuits connected to the battery that continues to supply power, even when the critical circuit breakers have been disengaged?
Stationary (fixed) or mobile (vehicle)
If mobile what is the accessory voltage? (i.e. 12v)
Will this be linked to the network to have internet access via WiFi?
The typical connection is via WiFi. USB is there to do the initial commissioning and firmware update - and should not be left connected to the computer in normal operation.