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I have a 1500w power inverter with a fault code OLP

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Posted on Jan 02, 2017

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SOURCE: I have a roadpro 1500w inverter faulting on & off and drawing a lot of current and nothing is connected to the output.

I have a roadpro 1500w inverter. The fault light is on and there is no output. What should I check to trouble shoot?

Posted on Aug 28, 2009

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SOURCE: roadpro rppi-1500w inverter fault light no AC output?

you have a burned resistor near the corner

Posted on May 29, 2010

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My 1500 watt cobra power inverter shows "olp" wuth nothing connected. bought a new one also 1500 watt and as soon as i turn it on shows "olp" also.


Pop is over load protection. You may have gotten a bad inverter. When you do connect something to it does it go away? If so what size wires are you using? To small a gauge wires cause all kinds of problems.

Feb 27, 2017 | Cobra Electronics - Others

1 Answer

3000 watt eliminator with OLP and LUP CODES any Ideas


Assuming you have a 12VDC In 120V AC out 3000W inverter.
LUP indicates battery voltage is low, so firstly make sure:

1. You 12V battery is good, it's large enough a minimum of 75AH and probably much larger is recommended and it's fully charged.
2. Verify you are using the correct size copper wires from battery to the Inverter DC INPUT(s). If you keep wire short the wire size can be smaller, but if the DC input wires are longer then you will need to use thicker copper wires.

At MAx load you would be taking 250 AMP from battery, so for a 5% Volatge drop of .6 V for a 10 ft length of cables from battery to Inverter you would need to use a 1AWG copper cable.

http://www.calculator.net/voltage-drop-calculator.html?material=copper&wiresize=0.4066&voltage=12&phase=dc&noofconductor=1&distance=10&distanceunit=feet&eres=125&x=37&y=8

OLP is a overload condition, which means you may have to many high powered AC powered things connected to the Inverters AC outlets or maybe something that has large start up surge, ie devices large electric motors.

Or it could be all due to a faulty Inverter.

Oct 22, 2016 | Eliminator Electronics - Others

1 Answer

I have 3000 w inverter now when I turn on its saying olb and fans on back side one


Make & Model? A troubleshooting Hint: Remove & unplug everything from the AC outlet(s), still have the OLP error code? Note: Some 3000W Inverters have two inverter circuits operating in parallel, if one circuit blows its internal fuses maybe its only work on one circuit ? Usually there are a number of 25A car fuse (Qty 8) in parallel for each inverter circuit.

Unless it was overloaded momentarily there should be no reason for the fuses to blow under normal working conditions. That means highly likely they may have blown due to circuit fault.

Oct 22, 2016 | Inverter Electronics - Others

1 Answer

I replaced the 35amp fuses with 40s in my 1550 cobra power inverter will that cause the olp code to pop up


The olp overload refers to Watts and the fuse is monitoring Amps! The rule is replace fuses with the same or lower but in this case it isn't causing the olp!

Oct 22, 2014 | Electronics - Others

1 Answer

Have a PI-1500 Schumacher that I just got and trying to hook up to a litium Ion battery with charged voltage of 15.86 - lights on inverter light up(red and green) but no power output--- Is this battery...


you must be careful you can not interchange Lion and Nicad there voltages are not compatible and the intelliichargers will register a fault you must replace with same batterys recomended for your unit

Oct 24, 2013 | Schumacher PSI-1500 1500W Pwr Inverter

1 Answer

I have a roadpro 1500w inverter faulting on & off and drawing a lot of current and nothing is connected to the output.


I have a roadpro 1500w inverter. The fault light is on and there is no output. What should I check to trouble shoot?

Apr 16, 2009 | Electronics - Others

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