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Old 11-24-2020, 09:17 AM   #15
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Yes, the inverter switch also disconnected the charger portion of the inverter/charger. Resulting in the house batteries going flat.

Connect an external charger or jump start and run the engine to charge via alternator.
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Old 11-24-2020, 11:04 AM   #16
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I'm not an expert, but ...

Quote:
Originally Posted by Spdracr39 View Post
Just added FYI when you are plugged into shore power the only thing the Inverter/Charger does is charge the batteries so there is no reason to turn it off.
We frequently call the Magnum unit the "inverter". This is somewhat confusing since it contains both an inverter and a charger.

So I really don't know for sure, but I believe that if your shore power is low (like not plugged into a 50a outlet) then the Inverter has the ability to supplement the needed current (if you have a whole lot of stuff on) by using battery power and the inverter. On my 2017 coach the Magnum Inverter/Charger is controlled by a Magnum panel (not the Spyder) and I can turn the inverter ON/OFF as well as the Charger ON/OFF. This is only while the Magnum unit is on. On my coach I have no Magnum disconnect, so it always gets power.

When I setup at a new campsite, after I've plugged in, I set the Inverter OFF (not the Magnum unit) and leave the Charger ON. When I'm ready to leave, I turn the Inverter ON before I unplug. While in storage, I leave the Inverter OFF to keep from running the batteries down.
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Old 11-24-2020, 11:26 AM   #17
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Quote:
Originally Posted by BradS View Post
We frequently call the Magnum unit the "inverter". This is somewhat confusing since it contains both an inverter and a charger.

So I really don't know for sure, but I believe that if your shore power is low (like not plugged into a 50a outlet) then the Inverter has the ability to supplement the needed current (if you have a whole lot of stuff on) by using battery power and the inverter.
.
That feature is only on the Magnum " Hybrid " Inverter/charger.

Other manufactures may also offer that, but they are wired into the system in a different way then standard inverter/chargers.
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Old 11-24-2020, 06:32 PM   #18
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Quote:
Originally Posted by Kjon View Post
My Allegro came with a list of everything installed in it with serial numbers. It was a single sheet of paper. I took a picture of it and keep it on my phone.
Ours did too. But the Magnum wasn't on it. Also not everything on it was right. For example, we've got a Maytag fridge but the sheet said we had a Whirpool. The numbers didn't match up either. I don't know who got the Whirlpool with the model/serial numbers listed on our sheet, but it wasn't us.

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Old 11-25-2020, 09:40 AM   #19
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Thank you... I have the MS-2812

Quote:
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That feature is only on the Magnum " Hybrid " Inverter/charger.

Other manufactures may also offer that, but they are wired into the system in a different way then standard inverter/chargers.
Thank you so much for clarifying this. I'm not sure where I read about this feature, but I didn't want the inverter running while I was plugged in.
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Old 10-03-2022, 01:52 PM   #20
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I am updating this thread in case others have this problem, which can bring about quite a bit of stress tot he owner. My 2020 Allegro Bus lost all power as well and it was not until I read this thread and others to help me figure it out. I jump started the 12V system and got my Jenny running, and will let it recharge the Coach batteries. I will see if they will hold a charge after that. Replacement won't be cheap if it's needed. Thank you to all of you for your help.
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