Tripp Lite APS1250
PowerVerter® APS 1250-Watt Inverter/Charger with Auto-Transfer Switching and 2 Outlets

OUR PART #:  APS1250

The Tripp Lite APS1250 DC-to-AC inverter with automatic line-to-battery transfer and integrated charging system serves as an extended run UPS...
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Tripp Lite APS1250
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The Tripp Lite APS1250 DC-to-AC inverter with automatic line-to-battery transfer and integrated charging system serves as an extended run UPS, a standalone power source or an automotive inverter. Supplies up to 1250 watts of continuous 120V AC power to 2 AC outlets from any 12V battery or automotive DC source. The OverPower inverter output feature temporarily provides up to 150% of the continuous output for 1-60 minutes and DoubleBoost inverter output feature delivers up to 200% of the continuous output for up to 10 seconds, providing the extra power needed to cold start heavy-duty tools and motorized equipment.

When an AC cable is connected to a live wall socket, commercial power passes through to connected equipment and the battery set is recharged via a 3-stage, 30 amp charging system. In UPS mode, the APS system responds to blackouts and voltage fluctuations with a near instantaneous automatic transfer to battery-derived AC output.

It includes a set of high current DC input terminals for simple installation (user supplies batteries and cabling - see owner's manual for recommendations). Passes sine wave utility or generator power during battery charging and UPS line power operation, plus efficient PWM sine wave AC output in inverter and UPS backup modes. Reliable large transformer design, with frequency control powers resistive electronic loads or large inductive motors, compressors and other items with high current needs on startup. An optional APSRM4 wired remote power switch with full status LEDs provides remote power inverter on/off switching and continuous status information (APSRM4 sold separate). Supports an unlimited amount of runtime with any number of user-supplied batteries connected. Highly adaptable to a variety of applications and site conditions with adjustable charger settings for wet/gel battery types and selectable line to battery power transfer voltages.


  • 12V DC or 120V AC input; 120V AC output; 2 outlets
  • 1250 watts continuous, 1875 watts OverPower™ and 2500 watts DoubleBoost™ inverter output
  • 2 NEMA 5-15R receptacles
  • 3 stage, 30 amp wet/dry cell battery charger
  • Auto Transfer Switching option for battery backup / UPS operation
  • Reliability enhanced large-transformer design with protected DC wiringterminals


  • Intended Application  Emergency Home Power


  • Frequency compatibility  60 Hz
  • Output watts  1250
  • Continuous output capacity (watts)  1250
  • Peak output capacity (watts)  2500
  • Output nominal voltage  120V
  • Output voltage regulation  LINE POWER (AC): Maintains 120V nominal sine wave output from line power source. INVERTER POWER (AC): Maintains PWM sine wave output voltage of 120 V AC (+/-5%).
  • Output frequency regulation  60 Hz (+/- 0.3 Hz)
  • Overload protection  Includes 8A input breaker dedicated to the charging system and 12A output breaker for AC output loads
  • Outlet quantity / type  2 AC outlets


  • Nominal Input Voltage(s) Supported  120V AC
  • Recommended Electrical Service  DC INPUT: Requires 12VDC input source capable of delivering 125A for the required duration (when used at full continuous capacity - DC requirements increase during OverPower and DoubleBoost operation). For automotive applications, professional hardwire installation with 225A minimum battery system fusing is recommended. AC INPUT: 120VAC
  • Maximum input amps / watts  DC INPUT: Full continuous load - 127A at 12V DC. AC INPUT: 12 amps at 120VAC with full inverter and charger load (6.3A max charger-only)
  • Input connection type  DC INPUT: Set of 2 DC bolt-down terminals. AC INPUT: NEMA 5-15P input plug
  • Voltage compatibility (VAC)  120
  • Voltage compatibility (VDC)  12


  • Expandable battery runtime  Runtime is expandable with any number of user supplied wet, gel or SLA batteries
  • DC system voltage (VDC)  12
  • Battery Pack Accessory (optional)  98-121 sealed lead acid battery (optional)
  • Battery recharge rate  30A max, 3 step, float for long termmaintenance

UPC Aassignment

  • Unit Carton UPC#  037332090126

LEDs, Alarms & Switches

  • Switches  3 position on/off/remote switch enables simple on/off power control plus "auto/remote" setting that enables distant on/off control of the inverter system when used in conjunction with optional APSRM4 accessory when used in inverter mode. In AC uninterruptible power mode, auto/remote setting enables automatic transfer from line power to battery power - to maintain continuous AC power to connected loads.
  • Front panel LEDs  Set of 6 LEDs offer continuous status informationon load percentage (6 levels reported) and battery charge level (7 levelsreported). See manual for sequences.

Surge / Noise Suppression:

  • AC suppression joule rating  450


  • Unit Dimensions (HWD/in)  7 x 8.75 x 9
  • Unit weight (lbs)  23.2
  • Cooling method  Multi-speed fan
  • Material of construction  Polycarbonate
  • Receptacle Color  BLACK
  • Style  Heavy-duty with built-in battery charger
  • Form factors supported  Mounting slots enable permanent placement ofinverter on any horizontal surface (see manual for additional mountinginformation)


  • Relative Humidity  0-95% non-condensing

Line / Battery Transfer:

  • Transfer time from line power to battery mode  16.6 milliseconds (typical - compatible with many computers, servers and networking equipment - verify transfer time compatibility of loads for UPS applications)
  • Low voltage transfer to battery power  In AC "auto" mode, inverter/charger switches to battery mode as line voltage drops to 75V (user adjustable to 85, 95, 105V - see manual)
  • High voltage transfer to battery power  In AC "auto" mode,inverter/charger switches to battery mode as line voltage increases to 135V(user adjustable to 145 - see manual)

Special Features:

  • Remote control capability  Yes

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