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PIP 2424LV-MSD 146 VAC even when the inverter is off

Phatness

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Mar 7, 2022
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Hello everyone,

I have a PIP 2424LV-MSD in an RV. Shore power goes to both the inverter/charger and a GoPower TS-50 (auto transfer switch), and the inverter AC out also goes to the other input for the ts-50. For the last couple of months, everything has been working fine until yesterday. With shore power on and the inverter off, we turned on an air conditioning unit, shortly after (during startup surge) the ts-50 started chattering, and then the breaker at the power pedestal tripped.

I've measured everything I could think of with a multimeter and got some unexpected voltages I can't explain.

With the inverter off or on, shore power on:
- PIP2424 is getting 120 Vac on the input ports
- PIP2424 is putting 145-146 Vac on the output ports
- PIP2424 is putting 26 Vdc onto the batteries

With the inverter off and shore power off, with very small solar input 7-10 watts:
- PIP2424 AC output ports show 0Vac
- PIP2424 AC input shows 0Vac

With the inverter on and shore power off, no solar at all
- PIP2424 AC output ports show (normal) 120Vac
- PIP2424 AC input shows 0Vac

Based on this it does not seem like the transfer switch is wired incorrectly or giving any kind of crossover, I disconnected the inverter output from the switch until I can figure this out anyway. What confuses me is why the PIP2424 would give any kind of voltage on the inverter output even when switched off?

Today I am planning on opening up the box to check the PCB for any damage, maybe from road vibrations?

Any ideas or help would be appreciated, the previous owners installed this inverter about 1-1.5 years ago so it's not too old.
 
The inside looks clean and in good condition, I know there isn’t quite enough clearance on the sides as the manual recommends but there should still be enough air flow here.

After starting the shore power the voltage on my multimeter give some very high readings before settling on 145 again. I’m not sure if that’s just a bad probe connection.

Since there’s nothing obvious wrong inside I’ll start looking for some kind of diagnostic options in the manual and try a different power source
 

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"- PIP2424 is putting 145-146 Vac on the output ports"
Can you show the screenshot of the meter reading?
Are you sure it is not displaying 145 ~146 mVac?
 
151.8-151.9 this time, some appliances were on using the grid power in addition to the charger inverter. I also took readings on all the legs from the grid and saw 240 between l1 and l2 and 120 to neutral like I should. Also 120 going into the inverter from the grid comparing the l1 (black cable) to both ground and neutral
 

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Is the AC OUT terminal connected to any loads when the inverter power switch is in the off position?
 
No the AC out from the inverter isn’t connected to anything. I have disconnected the far end of the cable (2-3 ft) and put some wire nuts on the ends.
 
Hmm.
I have PIP1012 which is the 12V version, I do not have my inverter on either since I use the 3000W inverter instead for my big fridge, so it is in true bypass mode so the output Voltage is the same as utility input, I cannot see how the output Voltage gets boosted like that.
I you connected 60W 120V incandescent lamp to the output, does the lamp get really bright?
Dose the PIP display 150V output also?
 
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