Good Sam Club Open Roads Forum: Help: DC Power cuts out under load
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 > Help: DC Power cuts out under load

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Freep

Wisconsin

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Posted: 05/16/20 06:11pm Link  |  Quote  |  Print  |  Notify Moderator

2014 Lance 992. Symptom is power interruption with moderate to heavy DC loads.


During our last trip we started experiencing brief power interruptions when running loads like heater plus charging laptops and radio running, water pump running. This problem happens at all states of charge for the battery. It never happens when there is AC power available. I suspected the Progressive Dynamics mighty mini and contacted them. I was told it's likely not their power center and was told to look for an inline auto resetting circuit breaker. This I have not been able to locate. I was also told that it could be a bad or loose ground wire.

What I have done:

  • cleaned battery terminals
  • cleaned chassis grounding bar
  • pulled all fuses and run the fridge on DC ... still happens
  • inspected all wires and connections



After this problem presented itself I upgraded the solar on the camper and with my MPPT controller I can see that the battery is still working fine during the power outage. The MPPT controller is wired directly to the battery and doesn't experience a power drop.

I've inspected every wire and connection I can find and still can't find the culprit.

Suggestions are welcome.

* This post was edited 05/16/20 06:30pm by Freep *


2014 Lance 992
2014 Ram 3500 DRW Turbo diesel

wnjj

Cornelius, Oregon

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Posted: 05/16/20 06:32pm Link  |  Quote  |  Print  |  Notify Moderator

How about the battery disconnect switch? Maybe try jumping across it for a while and see if the problem goes away. The current through it may be heating it if the contacts are a little poor.

This fits with your comment that it always works fine when on shore power.

It also couldn’t hurt to cycle it off and on firmly a few times.

enblethen

Moses Lake, WA

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Posted: 05/16/20 06:37pm Link  |  Quote  |  Print  |  Notify Moderator

Sounds like you could have an auto resetting circuit breaker. look around the battery for it.


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Freep

Wisconsin

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Posted: 05/16/20 07:06pm Link  |  Quote  |  Print  |  Notify Moderator

wnjj wrote:

How about the battery disconnect switch? Maybe try jumping across it for a while and see if the problem goes away. The current through it may be heating it if the contacts are a little poor.

This fits with your comment that it always works fine when on shore power.

It also couldn’t hurt to cycle it off and on firmly a few times.


Thanks! That's a great thing to check.

Freep

Wisconsin

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Posted: 05/16/20 07:07pm Link  |  Quote  |  Print  |  Notify Moderator

enblethen wrote:

Sounds like you could have an auto resetting circuit breaker. look around the battery for it.


I've looked everywhere for it. I'll be contacting Lance Monday to ask them if my model even had one.

enblethen

Moses Lake, WA

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Posted: 05/16/20 08:09pm Link  |  Quote  |  Print  |  Notify Moderator

It should have one right near the battery. I saw one camper with it stuff in a metal junction box in the battery compartment.

Flute Man

Payson, Arizona

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Posted: 05/16/20 08:34pm Link  |  Quote  |  Print  |  Notify Moderator

I highly suspect bad battery causing low battery voltage. If I were you I would measure the battery voltage under load.
You may call me if you wish and maybe I can help you over the phone. I am an experienced electrical troubleshooter.

* This post was edited 05/17/20 06:35am by Flute Man *


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travisc

Pacific NW

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Posted: 05/16/20 09:16pm Link  |  Quote  |  Print  |  Notify Moderator

We had a progressive dynamic converter in our rv go out, and replaced it with one from bestconverters.com. 12v supply would drop with the more lights we turned on


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cavie

Port Charlotte Fl/ Hindsdale MA

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Posted: 05/16/20 09:27pm Link  |  Quote  |  Print  |  Notify Moderator

Take the battery to and auto parts store or Battery;s Plus. Have it
"Load tested" with an old fashion battery load tester.

Copy and paste.

www.harborfreight.com/100a-612v-battery-load-tester-61747.html?


2011 Keystone Sprinter 323BHS. Retired Master Electrician. Retired Building Inspector.

All Motor Homes are RV's. All RV's are not Motor Homes.

enblethen

Moses Lake, WA

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Posted: 05/16/20 09:36pm Link  |  Quote  |  Print  |  Notify Moderator

Here is some information from a private message from NRALIFR
"That does sound like an auto-reset CB though. My much older Lance had one of those that was screwed to the OUTSIDE of the battery box, so you had to get to it through the cabinet under the galley sink. It was hard as heck to see because it was so high up on the outside of the battery box. Of course my camper is quite a few years older than his.

Other than that, I’d be looking for the ground bus on the low voltage panel and checking for loose screws. My camper has a low voltage fuse panel that’s separate from the converter/charger power center. I’ve had screws loosen up there and cause problem"

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