January 2019 update: The BMS16 is now optionally available with an isolated CAN bus interface, recommended when connecting to third party devices where ground reference is unknown. It is not needed if you are only using the CAN bus for a monitor and/or current sensor. The isolated CAN version is slightly more expensive due to a few additional components inside. We are also rolling out optional CAN integration with solar/hybrid/battery inverters. This does require isolated CAN. Currently SMA and Goodwe inverters are supported, and Solax is coming soon. Please contact us before ordering if you are interested in inverter integration, as it requires non-standard firmware (including different CAN baud rate).
Lithium batteries have been a revolution in energy storage, but can be easily damaged if overcharged or over-discharged. In battery packs built from many cells, the overall pack voltage offers no guarantee of individual cells remaining within safe voltage range. Therefore a battery management system is required to monitor individual cells voltages and respond if any cells go out of range.
The ZEVA BMS16 was designed to address the need for a simple, reliable and easy to install BMS for 24V to 48V lithium battery packs. It can work in “Stationary Mode”, suitable for off grid / backup battery applications, or in normal mode, more suitable for electric vehicles. In Stationary Mode, the BMS16 uses programmable hysteresis bands for the high and low voltage thresholds, to allow for automatic operation (no need for manual resets) without rapidly cycling external devices. For example, the BMS16 may disable the charger when a cell hits 3.8V, then will automatically re-enable it some time later when the cell drops below 3.4V. In EV mode, outputs will stay off until the unit is power cycled, or wakes from sleep.
The BMS16 includes built-in switchmode power supply, running off the monitored batteries, to avoid the need for any separate power supply. To prevent the possibility of over-discharge caused by the BMS itself, it can switch its own power off if any cells get critically low. The BMS16 features dual solid state output relays rated at 1.3A continuous for directly switching large power relays or contactors. It also has a CAN bus port, allowing remote monitoring and system configuration from our EVMS Monitor, or integration with third party controllers or dataloggers.
Internal shunt balancers maintain pack balance by bleeding a small amount of power from any high cells at the end of each charge cycle. The BMS16 has a temperature sensor input which can automatically shut down the battery in cases of over-temperature, and a current shunt interface which is used to calculate battery current, power and state of charge.
The BMS16 may either be factory-configured, or user-configured when used with a BMS16 Monitor. Please refer to the manual (right) for details of programmable settings.
New features for version 2:
CAN bus compatibility with EVMS Monitor V3, CAN current sensors, TC Chargers, etc
Sleep mode input, to disable CAN bus and relay outputs when system is not in use.
Now also compatible with 24V systems (down to 8 cells)
Significantly more compact dimensions
Notice of minor firmware bug in systems sold before March 2019:
A bug was found which caused the EVMS Monitor to not save cell configuration correctly the first time you exit settings. If you notice strange voltages showing on the monitor when you first start up, simply enter and exit settings *twice*, to correct the configuration then have it saved to memory. We can also offer a free firmware update of your monitor to rectify this issue if you prefer - please contact us to discuss. Note that this bug only affects the display of voltages on the monitor, not the operation or safety of the BMS itself.
Cells managed: 8 to 16 cells
Supported chemistries: LiFePO4, LiCo, LiPo, LiMn
Maximum total voltage: 72V
High, low and shunt voltage thresholds: Factory configurable between 2.00-4.50V
Dual solid state relay (SSR) outputs, 100V 2A max
Built-in current measurement via shunt
CAN bus interface for external monitor, hall effect current sensors, TC chargers, etc.
Status LED for visual feedback
Internal switchmode power supply
Internal shunt balancers (~120mA)
Mounting holes: 2x Ř4mm, 116mm apart
Datasheets & Manuals: