RV Power Inverter Charger 1250W Automatic Transfer Switching Hardwire

1250W PowerVerter RV Inverter/Charger with Hardwire Input/Output

Model Number: RV1250ULHW

  • 12V DC or 120V AC input; 120V AC output (hardwired)
  • 1250 watts continuous and 2500 watts DoubleBoost inverter output
  • 3 stage, 14/55 amp selectable wet/dry cell battery charger
  • Built-in Isobar® premium AC surge protection and Auto Transfer Switching option for battery backup / UPS operation
  • Tested to power inverter standards UL458 (USA) and CSA (Canada)
  • High reliability large-transformer design with protected DC and AC wiring terminals
(3 Reviews)
Read all 3 reviews  |  Write a Review

Tripp Lite RV1250ULHW Inverter/Charger is the quiet alternative to gas generators with no fumes, fuel or noise to deal with! It provides equipment with utility- or generator-supplied AC electricity filtered through premium ISOBAR surge protection. This 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 suitable for rugged RV applications. Supplies up to 1250 watts of continuous 120V AC power from any 12V DC battery or automotive DC source. OverPower TM inverter output feature temporarily provides up to 150% of the continuous output for 1-60 minutes, and DoubleBoost TM 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 hardwire AC input is energized, commercial power passes through to connected equipment and the battery set is recharged via 3 stage, selectable 14/55 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. 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. Optional APSRM4 wired remote power switch with full status LEDs provides remote power inverter on/off switching and continuous status information (APSRM4 sold separately). 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.

NOTE: To protect against high current draw that may occur during inverter failure, a fuse link rated at 200a should be positioned no more than 18" from the RV1250ULHW's battery in the positive line.

Key Features

  • RV1250ULHW serves as an automotive or stationary DC-to-AC inverter with automatic line-to-battery transfer and integrated battery charger
  • Supports 120V AC output from a 120V AC line power source or 12V DC battery source
  • 16.6 millisecond automatic transfer between line and battery power supports UPS protection during blackouts and voltage fluctuations for equipment compatible with a one cycle transfer time
  • 1250 watts continuous AC output in inverter mode, 2400 watts continuous AC output in AC mode
  • Double Boost inverter output supports momentary startup loads up to 200% of the continuous rating for up to 10 seconds
  • OverPower inverter output supports longer duration overloads to 150% for 1-60 minutes under ideal battery and temperature conditions. (For best results, utilize OverPower usage for as short of a duration as possible, ensure battery bank and cabling is able to provide full nominal DC voltage under load and allow inverter/charger to fully cool before and after OverPower usage.)
  • 3 stage, selectable 14/55 amp battery charger with adjustable settings for wet/gel battery types offers fast, reliable battery recharging
  • Protected hardwire bolt-down input lugs safely accept heavy gauge input wiring from attached battery bank
  • Protected hardwire output passes 120V line power or inverter output through to connected equipment
  • Reliability enhanced large-transformer design tested to UL (USA) and CSA (Canada) standards
  • Moisture-resistant construction enables vehicular or marine operation in high humidity environments
  • 3 position operating mode switch supports "AUTO" mode to enable automatic transfer between DC and AC modes, CHARGE-ONLY to maintain a full battery charge when AC is present without auto transfer and SYSTEM OFF settings
  • Set of six front panel LEDs display AC/DC operational modes, overload status, DC voltage level, shutdown status and system fault status
  • Set of 4 configuration dipswitches support wet/gel battery charging profiles, adjustable 135/145V high voltage auto transfer during overvoltages and selectable 75/85/95/105V AC low voltage auto transfer during brownouts
  • Set of 4 additional configuration dipswitches support 4 levels of charger limiting relative to output load size, a battery equalization program and battery charger low/high settings
  • Resettable 12A charger AC input breaker and resettable 20A AC output breaker and automatic 2 speed cooling fan protect the inverter from load and temperature related failures
  • Grounding lug properly connects the inverter/charger system to earth ground or vehicle grounding system
  • Automatic overload and thermal shutoff safely turns off inverter as excessive loads or overheating conditions develop
  • Front panel remote control connector enables remote off/on switching (requires APSRM4 switch accessory). Optional APSRM4 accessory also includes user configurable jacks to support inverter shutoff or startup as a vehicle ignition is engaged
  • Front panel remote control connector enables remote off/on switching (requires APSRM4 switch accessory). Optional APSRM4 accessory also includes user configurable jacks to support inverter shutoff or startup as a vehicle ignition is engaged
  • Load sensing control dial enables adjustable load threshold required to automatically turn the inverter on and off in DC mode as load conditions change
  • Includes battery temperature sensor with 20 foot cable to prolong battery life by adjusting the charge level based on battery temperature
  • Automatic Generator Starter jack enables user configuration of automatic generator startup as inverter batteries drop to 11.5VDC and generator shutoff as inverter batteries are recharged to 14.1VDC

Typical Applications

  • Versatile inverter/charger system with auto-transfer switching serves as an automotive inverter for RVs, over-the-road trucking, conversion vans and fleet service vehicles; a standalone alternative power source for off-grid, alternative energy or export applications and as an uninterruptible power supply (UPS) for items compatible with a 16.6 millisecond transfer time.

Package Includes

  • RV1250ULHW Inverter/Charger
  • Instruction manual with warranty information


Frequency Compatibility 60 Hz
Output Receptacles Hardwire
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 12A input breaker dedicated to the charging system and 20A output breaker for AC output loads
Pure Sine Wave Output No


Nominal Input Voltage(s) Supported 120V AC
Recommended Electrical Service DC INPUT: Requires 12V DC input source capable of delivering 95A for the required duration (when used at full continuous capacity - DC requirements increase during Over-Power and Double-Boost operation). For automotive applications, professional hardwire
Maximum Input Amps / Watts DC INPUT: Full continuous load - 95A at 12V DC. AC INPUT: 20 amps at 120V AC with full inverter and charger load (12A max charger-only / combined input load to support charger and AC output is automatically controllable to 66%-33%-0% based on AC output lo
Input Connection Type DC INPUT: Set of 2 DC bolt-down terminals. AC INPUT: hardwire
Input Cord Length Details DC INPUT: User supplies cabling. 4 gauge or larger (see manual). AC INPUT: hardwire
Voltage Compatibility (VAC) 120
Voltage Compatibility (VDC) 12


Expandable Battery Runtime Runtime is expandable with any number of user supplied wet or gel type batteries
DC System Voltage (VDC) 12
Battery Pack Accessory (Optional) 98-121 sealed lead acid battery (optional)
Battery Charge 14A / 55A (selectable)
LVC (Low Voltage Cut-Off) 10V DC +/-3%
Expandable Runtime Yes


Front Panel LEDs Set of 6 LEDs offer continuous status information on load percentage (6 levels reported) and battery charge level (7 levels reported). See manual for sequences.
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 APSRM4 accessory (sold separately) in inverter mode.


AC Suppression Joule Rating 600


Shipping Dimensions (hwd / in.) 12.5 x 11 x 10.75
Shipping Dimensions (hwd / cm) 31.75 x 27.94 x 27.31
Shipping Weight (lbs.) 24.9
Shipping Weight (kg) 11.3
Unit Dimensions (hwd / in.) 7 x 8.75 x 9
Unit Dimensions (hwd / cm) 17.78 x 22.23 x 22.86
Unit Weight (lbs.) 23.3
Unit Weight (kg) 10.57
Cooling Method Multi-speed fan
Material of Construction Polycarbonate
Form Factors Supported Mounting slots enable permanent placement of inverter on any horizontal surface (see manual for additional mounting information)


Relative Humidity 0-95% non-condensing


Transfer Time (Line Power to Battery Mode) 16.6 milliseconds (typical - compatible with many computers - 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)


Load Sensing Optional load sense function enables automatic inverter shutoff and startup as connected equipment is powered off and on. Front panel load sense potentiometer can be set to shutoff or turn on inverter power in response to loads of any level.
Remote Control Capability Yes


Certifications Tested to UL458 (USA) and CSA (Canada)


Product Warranty Period (U.S. & Canada) 30-month limited warranty
Product Warranty Period (International) 1-year limited warranty
Product Warranty Period (Mexico) 30-month limited warranty
Product Warranty Period (Puerto Rico) 30-month limited warranty


by PowerReviews
Tripp LitePowerVerter® 1250W RV Inverter/Charger with Hardwire Input/Output

(based on 3 reviews)

Ratings Distribution

  • 5 Stars



  • 4 Stars



  • 3 Stars



  • 2 Stars



  • 1 Stars



Reviewed by 3 customers

Sort by

Displaying reviews 1-3

Back to top


Solid backup


from Undisclosed

Comments about Tripp Lite PowerVerter® 1250W RV Inverter/Charger with Hardwire Input/Output:

Last time a big storm went through here and threatened to flood my basement, the sump pump ran constantly just keeping up. I decided I needed power backup for the sump pump. A generator would be a pain because it would have to be outside with extension cord to the sump - nothing I could leave unattended.
So, I put together a system of TrippLite RV1250ULHW inverter/charger, 2 TrippLite batteries (98-121's) in a TrippLite battery case (BP-260), and mounted it on a cart I built for the purpose. I provided a GFCI outlet and grounded the set-up via my copper pipes. I have a TrippLite remote panel (APSRM4) installed at the top of the stairs, so I don't even have to go into the basement to check on the unit.
I'm not sure how long it will run the sump pump, but it should handle a day or two, hopefully longer than most storm downpours. It may even have sufficient capacity to pull some lights or the freezer.
I'm not wishing for a big storm, but I'll rest a little easier if it comes.

Comment on this review


Good Unit , Little noisy


from Undisclosed

Comments about Tripp Lite PowerVerter® 1250W RV Inverter/Charger with Hardwire Input/Output:

I purchased this unit to provide backup power for woodstove cooling fan . We live in a area where the power is not reliable , and with us both working days needed a backup power source that could run a 500watt load for a couple of hours unintended . Unit works well , will run for 8 hours @ 500watt load on two 24ser/Deep cycle batterys . Inverter is a little noisy , and on slow recharge still has a humm . Good unit though , Power Ok , for not being a true sinewave .

Comment on this review


I have used a tripplit rv inverter before, but it apparently burnt/wore out replaced with rv1250ulhw so far I have not got it to charge the batteries.


from Undisclosed

Comments about Tripp Lite PowerVerter® 1250W RV Inverter/Charger with Hardwire Input/Output:

Hope to get this resolved tomorrow, with the help of techinal person.

Comment on this review

Displaying reviews 1-3

Back to top

Product Warranty

This product has a 30-month limited warranty. Get more information

Software & Downloads

More Support Resources for RV1250ULHW

Do you own a RV1250ULHW?

Get all your support resources in one place.

go to model support

Tripp Lite has a policy of continuous improvement. Specifications are subject to change without notice.

How can we improve the information on this page? Is an important specification missing? Did you spot an error? Please let us know how we can make this information more useful to you.