Inverter question

We also have a 2007 made by the same manufacturer, although it is a 2007 Monaco Knight. You don't specify which Holiday Rambler model you have. Our Knight did NOT charge the batteries from the engine running as it came from the factory. I should add that it did say in the manual that it was set up to charge from the engine. When we contacted Monaco we were told that the manual was a misprint and that function was only available on a "high end" coach.

What I'm missing here is the "Inverting" comment.. That has nothing to do with the charge process, and is a user select manual button push.

prstlk wrote:
We have a 2007 Holiday Rambler DP with an Onan 8500 Generator and an inverter.

The way it is set up through the Magnum Energy panel inside, our batteries do not charge as we are going down the road. The only way to charge them is to start the generator and run it for 2 or 3 hours or plug into shore power.

We called the manufacturer of the panel and they told me that I was to start the coach and go back and look at the panel. If it says “inverting” then it is not charging while the engine is running. This is in fact what it says. He basically told me that some charge while going down the road and some don’t and that it depends on how the MH manufacturer set it up.

Can someone tell me what I would need to do to have the batteries charge while the engine is running and we are moving?

At this point, I'm going to assume that you KNOW for sure that you ARE NOT receiving a charge to your house batteries while the engine is running, that you have checked the ACTUAL VOLTAGE at the batteries and not the panel inside, correct? If not, do so.

About 99.9999999% of the motor homes manufactured in the last 30 years or so, are designed so the engine DOES charge BOTH sets of batteries while the engine is running. I can't possibly imagine a coach manufacturer such as Holiday Rambler, and especially a 2007 model year, not setting up the 12V engine alternator system, to NOT charge both sets of batteries while the engine is running.

As has been stated, there are a few ways that this is accomplished. I am no expert on this stuff but, been around a few dozen coaches and have done a bit of battery work and charging system work. If I may ask, has this condition you're speaking of, ALWAYS been like this or, did it just develope? A suggestion. If it were me, I'd maybe get ahold of another HR owner or, if there's forum of that type, and see what more info you can find on your particular model and year.

About 99.9% of the time, the "Inverter/Charger" has nothing to do with the 12V alternator charging system. It's job is to charge one or both sets of batteries while on shore power, depending on how the system is setup.

So, some analyzing is in order before any major changes or alterations take place.
Scott

1. Acquire a DC volt meter.

2. Set the inverter to Off

3. measure the voltage at the house battery bank, and write down the number.

4. start the engine.

5. measure the voltage at the house bank. If it is higher than the number you wrote down, then the engine is charging the house bank.

The inverter/charger wouldn't charge the batteries since it has no source of 120V power while driving unless the generator is running.

Separately, there's an isolator of some sort that connects the chassis 12V system to the house 12V system when driving to allow the engine alternator to charge the battery. There are a few different designs out there. Many use a high current relay to make the actual connection, and these are a relatively common failure point in the system. (There are other possible failure points, like blown fuses, broken wires, etc.) I would guess that the Magnum Energy panel is not involved in this part of the wiring at all.