Hello all,2023 Momentum 25G ,No DC power inside coach, electric jack has power. It started with my 12V Refrigerator chirping from low voltage 11.2 V. I started the generator and ran for 45 minutes after bringing the voltage up to 12.7 or so. When the generator shut down I had no DC Power in the coach. On shore power all DC works. 2000w inverter works regardless. Batteries have been plugged in and charging 12 plus hours; they're at 13.3V (lifepo4). And still no DC power.I started testing from the battery back. Continuity was good on both inline 30A circuit breakers(frame mounted) and all fuses. Battery disconnect is on. I tested the battery dc in both positions. Inside: Panel:110 side no circuit breakers were not tripped, all fuses on DC side are good.?2023 Momentum (less than a month old) 2- 100ahr 12V Battleborns, 660 W Solar Panels,50A mppt solar controller, WFCO WF8955 AD Converter. All factory or dealer install.Any advice would be greatly appreciated,???????Thanks in advance.?

Some RVs on AC use the converter only for 12V house power and switch to the battery when the AC is off. Don't overlook a open ground. Use a voltmeter connected to frame ground to check voltage and not some groiund wire that may not be connected to the frame. Unplug and disconnect solar to so that the battery is the only source. Now turn the lights on for a load and start checking from the battery downstream and you should be able to isolate the problem.A bad battery can also be your problem. Voltmeters use very small amps and hence voltage OK for voltmeter but fail with a load, hence have the house lights on.

BTW A good continuity check does not mean there is any voltage on both sides of the device.Voltage with a load is what you want to verify and isolate the problem.

So, $50k camper, $1500 in batteries, a bunch in solar and a converter that I wouldn’t trust to charge a flashlight battery….what could go wrong….But sounds like either you have a deadman switch turned off, or the converter isn’t working or something is wired wrong. Feel bad since you’ll be at the mercy of a warranty tech who may actually be posting the same thing on the internet trying to figure it out…lol.

Thanks CA Traveler. I'm leaning toward an issue with the Battleborn BMS. I may need to discharge them and bring them back up. The problem is my auto detecting converter is not recognizing these batteries as Lifepo4 and charging them way below suggested voltage.

Check the voltage at the batteries. Then at the power control panel (fuses and circuit breakers).My RV has an automatic circuit breaker between the battery bank and the power distribution center. Some times they are not auto reset but have a push button on them.What is the "wake up" voltage on the batteries / bms?

No DC Power after shutting down generator | Good Sam Community

Grit_dog
Navigator
Sep 23, 2023
rvpep wrote:
In-line 20A Fuse was removed and replaced with a butt connector. The dealer with advice from GD performed the work under warranty. This 20A online fuse was a mistake at the factory.

Thank you for actually following up on this. That is helpful for those that may use this for more than just entertainment purposes.
CA_Traveler
Explorer III
Sep 23, 2023
Contact the mfg and make sure. Fuses are sized to protect the wires from over heating and causing related problems. What's protecting the wiring now?

I would measure the DC amps and wire size to be sure the lack of a fuse is the correct choice.

Yes I'm skeptical of dealers and mfg and suggest you should also be also. Their primary goal to often is for problems to exceed the warranty. And when it doesn't warranty repairs are often low priority.
rvpep
Explorer
Sep 23, 2023
In-line 20A Fuse was removed and replaced with a butt connector. The dealer with advice from GD performed the work under warranty. This 20A online fuse was a mistake at the factory.
rvpep
Explorer
Aug 18, 2023
I talked with a tech at WFCO regarding this issue. He is 99% sure that the 20A inline fuse is to small. He recommends installing and testing a 50A in its place. The 8 awg wire is rated for 60A and goes from the battery to the Power Dist. Panel/55A converter. Can anybody with a 2022 Grand Design Momentum G classc or older check and confirm there DC fuse size and report back please ? Thanks
pianotuna
Nomad III
May 22, 2023
rvpep,

Glad you found the issue. Consider moving to an autoreset breaker for that fuse.
MrWizard
Moderator
May 22, 2023
Finding the problem is good news, 20 amps sounds small for all the DC power in the coach,
rvpep
Explorer
May 22, 2023
Found the culprit. It was a 20A Fuse in the inverter compartment, one of the first places we checked. We assumed it was a fuse for the inverter and moved to the underside to test all breakers ,big fuses and battery disconnect switch. Oh well, live and learn. The bottom line is I need to know where my battery Amps are before I run something like a Kuerig. (I hear Kuerig is german for Rig Killer). I will follow up and try to determine exactly what caused this and report back. Victron bmv712 and Progressive Dynamics Converter will be coming soon.Thanks for all your help.
MrWizard
Moderator
May 21, 2023
What is the voltage at the batteries, does your system have a low voltage cutout between the battery and the control box? Unusual but possible, what is between converter which is using shore power and working, and your batteries, both sources of 12v power should be connected to the control center, there is a break in the circuit some place, like possibly the battery disconnect relay, these latch in position wether on or off, it's in the off position either its stuck, or the on off switch is not supplying the on signal, that relay Should be in the control center, if it's not, you need to find it
CA_Traveler
Explorer III
May 21, 2023
BTW Since you think it's the battery install a 12V car battery and post the results.
CA_Traveler
Explorer III
May 21, 2023
From what you've posted with the inverter working on battery only, the battery is not the problem. Sure it may be partially discharged but more than adequate for say lights. Do you have a voltmeter? if not buy a $20 one from harbor freight and start checking as suggested.

There is more to wiring than breakers and fuses. Like corrosion, bad connectors, broken wires, unknown components, etc.

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No DC Power after shutting down generator

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