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Inverter Fuse issue
Hi fellows,
Got back from Disney Fort Wilderness today and we had a great vacation. I would recommend it to anyone. The coach could not have performed better and all worked while on the road and at the campground. But when I got home and after dumping the black/grey tank, I backed the bus into it’s spot to shut off the generator that had been running for 12 hours. I turned off the A/C units and anything that might be a heavy load and shut down the generator, plugged in the 50 amp cord, but 1 of my 4024 inverters had a blank screen and no LEDs. Got the book and it said that the battery voltage was low or zero. After checking the fuse I had continuity and thought maybe that was not the problem. However after checking the voltage across the fuse I had 26.5 volts going into the fuse and 7.9 volts coming out??? Do these fuses only partial blow? And why would shutting off the generator cause this to happen???
Thanks for all the help. I will try to find a replacement fuse tomorrow, at least 2, and the cheapest I have found online is $38.00.
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7 Replies
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Check the reset switch on the back of the inverter. Little white button. It is is out, it is tripped. Push back in and try again. May not be the fuse.
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Thanks Mark I did check that breaker and it seems OK. The different voltage on each side of the fuse it what makes me believe it is bad.
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You need to isolate the fuse and check resistance to determine if it is bad.
Checking voltage across an operating fuse in circuit, will yeild a voltage of 0 as there is no difference between 26.5 volts into a fuse and 26.5 volts out of the fuse. You are basically putting the multimeter in parallel with the circuit and thus creating the situation where there is no difference in voltage to measure. If you tested across the fuse, the fact that you are getting any voltage reading is suggestive of a bad fuse.
If the fuse is bad, with 0 conductance, then you need to figure if you still have the 7.9 volts and where is that coming from?
Question, did you turn everything off before you started poking with a multimeter?
In advance, as you do not state how exactly you tested the fuse, any given answer may well be prone to errors.
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I confused the issue by saying voltage in and voltage out. What I did was to check the voltage on the cable connector on the battery side of the fuse and it read 26.5 volts. Then I checked the cable connector on the invertor side of the fuse and it read 7.9 volts. The inverter is powered completely off and I do get a continuity reading through the fuse. That’s why I was thinking the fuse was somehow partially blown to cause a voltage drop.
Thanks for all the help. -
I replaced the 300 amp fuse on Friday night and all is well. I discussed the issue with and electrician at work and he told me the fuses like I have are encased in sand and many times when they blow they leave a carbon trail that will allow continuity and some voltage. This is apparently what was causing me to have 8 volts on the inverter side of the fuse and to have conitnuity through the fuse. I was just glad it was not the inverter!! Wooohooo!!!
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Before the celebration begins, give serious consideration as to what caused the fuse to blow.
Your bus might be trying to tell you something.
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Yea that is a head scratcher!!! I turned off the roof airs and shutdown the generator. When the internal switch was made from gen power to invert the fuse blew. There have been no issues with that before. Is it possible an internal switch in the inverter is going bad?
I guess I will test it Thursday when we go to the Blue Grass festival at Tom Johnson Camping center in Marion, NC. at least this time I do have a spare fuse!!!
Thanks again for all the info!!!
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