Dead '24 Classic with Dragonfly lithiums and Victron Inverters

[RobertoK]

I have a 2024 Classic with 2 Victron Inverter/Chargers and 4 Dragonfly batteries. I stopped Sunday at storage to check on the coach before this winter storm. The coach was completely dead despite being plugged into 110 for the last month, including the cab. All disconnects were in the off position, but now the generator will not start, the truck will not start, and the batteries have zero charge.

The Victrons have flashing green "mains" lights, which i take to mean bad input voltage based on what little I can find on the internet. I tried resetting the victrons (switched to off, waited several minutes, turned back on), but the blinking "mains" persists.

The transfer switch clicks on when plugged in and shows input voltage when connected to 110.

I have tried calling the REV support number but the technician was unable to help with the problem. I have emailed Renegade but received no response for the last 48 hours, and I am hoping one of the members here might be able to help.

What the heck can I do to get this coach running?

Historically it has charged just fine when on 50A or the generator...

Thanks!

[Judge64]

There have been several posts about his issue with the dual inverter setup. One post said their inverters had the wrong settings in the configuration.

The latest post I saw said you need to leave the House 12V Disconnect in the ON position when plugged into 120vac. This will allow the second inverter to enter invert mode and inverter #1 to charge / pass-thru.

If you turn the House 12V Disconnect OFF you are triggering a relay which switches the inverter to charge only mode. In this mode the second inverter cannot latch onto the incoming power since it is in phase and the system is programmed as split phase 240vac, thus no inverter to latch onto the incoming power and charge.

Again house 12V disconnect in the ON position. Inverter rocker switch in the ON position and Cerbo GX Inverter setting set to on and everything will work and charge just fine.

[lslblues]

Yep - he's referring to the post by Jesse Yoder, Renegades former electrical systems engineer/designer. With dual Victron inverters you have to leave house disconnect ON for it to charge when you are on 110. You'll want to hook up an external charger now since the batteries are dead.

[RobertoK]

Thanks! It would have been great if the dealer had known this, Renegade had bothered to reply with this answer, or heck if it was even mentioned in the manual….

Regardless I was able to charge the lithiums with an external charger enough to get the generator running and then e-start the chassis. What an adventure.

[RobertoK]

Update - I tried leaving the coach disconnect in the on position and plugging into 15 amp 110. Both Victrons switched to invert mode with no charging.

Renegade finally responded to my email and said the coach requires minimum 30 amp service to charge, which, from reading other threads on this subject, does not seem correct. It sounds like the Victrons are not set up correctly for one to enter charge mode.

They offered to remote into the system via the Cerbo to check the settings but that may take a few days.

In the meantime if any of the members have other thoughts, I am all ears!

Thanks!

[lslblues]

They had an issue where some were programmed wrong. Do you have an mk3 to usb cable?

[Judge64]

That makes no sense. The coach has no idea if you are plugged into 50A, 30A, 20A or 15A.

If you use the proper 50A to 20/15A adpater it should be splitting into two 120V lines.

Now there should be a setting to tell it the size of the shore power breaker so it throttles the charger so it doesn’t trip the shore power breaker….. but that isn’t your issue.


Check this thread……

https://www.irv2.com/forums/f297/new...ue-660436.html

[lslblues]

The coach can totally tell if it's on 50 amps or not - 2 phase power. It can't tell if it's on 30, 20, or 15. When on split phase power, both inverters will charge the batteries. When on single phase power (15/20/30 amp), inverter 1 charges the battery and passes through power and inverter 2 inverts and creates the split phase. If line 2 Power option is set to Fixed rather than Floating, it tells both chargers to do the same thing, and inverter 1 won't latch onto single phase shore power, thus no charging from either inverter. Friend with a 2025 Explorer just had the same issue.

Originally Posted by Judge64

That makes no sense. The coach has no idea if you are plugged into 50A, 30A, 20A or 15A.

If you use the proper 50A to 20/15A adpater it should be splitting into two 120V lines.

Now there should be a setting to tell it the size of the shore power breaker so it throttles the charger so it doesn’t trip the shore power breaker….. but that isn’t your issue.


Check this thread……

https://www.irv2.com/forums/f297/new...ue-660436.html

[Judge64]

Originally Posted by lslblues

The coach can totally tell if it's on 50 amps or not - 2 phase power. It can't tell if it's on 30, 20, or 15. When on split phase power, both inverters will charge the batteries. When on single phase power (15/20/30 amp), inverter 1 charges the battery and passes through power and inverter 2 inverts and creates the split phase. If line 2 Power option is set to Fixed rather than Floating, it tells both chargers to do the same thing, and inverter 1 won't latch onto single phase shore power, thus no charging from either inverter. Friend with a 2025 Explorer just had the same issue.

I don't have schematics showing how they are wiring the two inverters with shore power.

I was assuming the shore power coming into the coach went into the Power Distribution Center first and then there was a breaker off each leg protecting the AC input into the inverters.

The 50A service must be going directly into the inverters first and configured for split phase if they are detecting the dogbone is splitting the single 120V leg from 30 / 20 / 15 service.

Then that would make sense as to why the inverter won't charge.

It would be nice to see the schematics for it.

[RobertoK]

It definitely has two incoming 120V legs from the dogbone - I can see that much at least.

I don't have a MK3 to USB. I will order one as I strongly suspect this is something I am going to have to fix myself based on Renegade's response. I even quoted the thread that discussed the 25 Explorer with the same issue lslblues referenced in my response to Renegade - and I have heard nothing back from them.

[AZRenegade]

I had the same problem with my coach, I solved it by putting the coach and chassis disconnects in the off position then plugging short power into a 110 AC and then putting a battery tender on the chassis batteries. Since doing this, I’ve had zero issues with starting the coach or the generator.

[Idleup]

The 50/30 amp theory is not correct!

The dual Victron inverter chargers will charge the batteries even when using a 120 volt adapter. All I have is 120 volts in my garage. Only the inside inverter is used for charging.

First thing that needs to happen when you get a system is to set the VRM Wi-Fi up for Cerbo GX. It's done right on the touch panel, which I moved to the door. You can also access VRM on your home computer. From there you or anyone can set the needed parameters. Keep in mind the Victron has three modes of operation; On - Charger Only - Inverter Only. It's needs to be in the on position to function correctly.

I included a few images of the re-located Touch display using the stock wiring as well as VRM on my Ipad

Mike

[lslblues]

We know that is how the system is supposed to work. That is how mine works. A misconfiguration in the programming on the Multiplus can keep inverter 1 from charging. I've had 2 friends with this simple parameter being set wrong and their coach wouldn't charge on 120. As soon as it was changed, it worked as it is supposed to.

The Cerbo exposes very little of the Multiplus programming. You have to have the MK3->USB cable to do any serious inverter/charger programming.

Originally Posted by Idleup

The 50/30 amp theory is not correct!

The dual Victron inverter chargers will charge the batteries even when using a 120 volt adapter. All I have is 120 volts in my garage. Only the inside inverter is used for charging.

First thing that needs to happen when you get a system is to set the VRM Wi-Fi up for Cerbo GX. It's done right on the touch panel, which I moved to the door. You can also access VRM on your home computer. From there you or anyone can set the needed parameters. Keep in mind the Victron has three modes of operation; On - Charger Only - Inverter Only. It's needs to be in the on position to function correctly.

I included a few images of the re-located Touch display using the stock wiring as well as VRM on my Ipad

Mike

[RobertoK]

Thanks guys. I’ve been out of pocket for a bit but planning to get back into this. I will get the adapter - are there specific settings I should look at? Sounds like there are a lot of parameters to look at.