Sentinel 150 Series Automatic Battery Chargers
Sentinel 150 Series Automatic Battery Chargers


  • Switch mode power supply technology: light and compact, power efficient with low heat dissipation
  • High rate, low ripple float charging: 5A or 10A @ 12 VDC, 5A @ 24 VDC
  • Auto boost and temperature compensation
  • For stationary engine, genset and standby power applications
  • NFPA model with alarms for AC failure, charge fail, high battery volts, low battery volts



The Sentinel 150 line provides high performance battery charging for continuous float charge and standby power applications. Switch mode technology provides major advances in power supply and battery charger design, giving a compact and lightweight construction, improved power efficiency and low heat dissipation, wide supply voltage tolerance and low output ripple.


The chargers are configured for fast, accurate charging, to give optimum battery life and reliability. The very smooth output (<1% ripple) allows charging of sealed or vented batteries or use as a stand-alone power supply. Factory calibration is optimized for each specific battery type.


All models features an intelligent, multi-stage charge regime: during charge recovery mode, the Sentinel gives a constant (maximum) current output; as the battery approaches peak charge, the output reverts to float charge mode, maintaining an optimum cell voltage and supplying additional standing load current up to the rated maximum. Output current is always limited to the rates maximum, even during high load, short-circuit or reverse polarity connection.



Auto boost provides a temporary increase in output voltage, equalising the charge between cells and minimizing battery life and capacity. Auto boost is triggered automatically when the battery falls below a preset voltage, or can be initiated manually through a momentary switch input. At the end of the auto boost cycle, Sentinel automatically reverts to normal float charge mode, preventing battery over-charge and gassing.



Sentinel UL 150 models include a self-diagnostic circuit for monitoring charge fail fault conditions (AC supply/fuse failure, DC fuse failure or low/no charge current), with a solid-state relay output for driving a remote alarm or fault annunciator.


Enclosed NFPA models have NFPA 110 compliant alarms for AC failure, charge fail, high battery volts and low battery volts. 



The optimum charge voltage for lead acid and NiCd batteries varies with ambient temperature. Sentinel can be configured to sense battery temperature from a remote sensor and automatically compensate the output charge voltage. 



UL-recognized SNTLUL 150 model use an open-frame circuit board and base/heatsink with protective cover, for surface or DIN rail mounting in an existing control panel. UL-listed ESNTLUL150 models use a stainless-steel, wall mounted case.


Electrical connection is by screw-terminal blocks. Connection and cable access on ESNTL models is by a hinged front plate and knock-out sections in the enclosure side.

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