E T X - S E R I E S L I T H I U M B A T T E R I E S
3
Excessive Cranking Time vs Temperature and Amps (representative
curve for ETX-Hundred Series)
ETX-Hundred Series - BMS
Only the ETX-Hundred Series battery models are recommended for use as the primary
aircraft battery (starter battery). In addition to the features found in the ETZ-Series and
ETX-Series motorsports batteries, critical electronic circuits are redundant, the over-charge
protection is enhanced, and fault indication is included. All components associated with the
main electronic battery disconnect are redundant. The built-in redundancy and fail-safe
design (default is to allow charge / discharge current flow to/from battery) ensures that no
single point failure results in the battery unintentionally disconnecting. The design aligns
with the requirements for an FAA approved lithium battery as per RTCA performance
specification DO-311a and DO-160. Our ETX900-VNT includes a thermal run-away
containment system making it fully compliant with DO-311a specification.
In the event of a charging system failure where the voltage increases to above 15.5V, the
resistance to charging current increases, and above 16V the charging current is completely
blocked. The time delay for this feature is 3 seconds to allow the
aircraft alternator’s
over
voltage protection (crowbar circuit) to activate first. This design offers charge voltage
protection greater than 40V. The discharge current (current out of battery) is unaffected in
this situation. EarthX requires having automatic over-voltage protection (crowbar) for
alternator type charging systems (not required for <20 Amp pad mount standby alternators).
The
battery’s
microcontroller monitors all failure modes, and reports failures with a built-in
LED indicator and discrete output. The discrete output for external fault monitoring is a
