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Old 10-07-2017, 07:12 AM   #1
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Power Converter Question

Will a properly functioning power converter/battery charger power the travel trailer's 12V DC system, WITHOUT A 12V DEEP CYCLE BATTERY CONNECTED TO THE SYSTEM, when the trailer is connected to 120V 30A shore line?
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Old 10-07-2017, 08:35 AM   #2
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Isn't recommended special if you want to run your furnace. You have any reason you want to go this route?
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Old 10-07-2017, 09:42 AM   #3
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Originally Posted by wenzels2001 View Post
Will a properly functioning power converter/battery charger power the travel trailer's 12V DC system, WITHOUT A 12V DEEP CYCLE BATTERY CONNECTED TO THE SYSTEM, when the trailer is connected to 120V 30A shore line?
Do you mean specifically "WITHOUT A 12V DEEP CYCLE BATTERY" or do you mean without ANY 12v battery?

IMO, any 12v battery would be OK. Without a battery, there could be an issue with high current draw situations - running jacks or slides for example - without the amperage available from a battery. I haven't tried it so have no direct experience.
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Old 10-07-2017, 10:01 AM   #4
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Will a properly functioning power converter/battery charger power the travel trailer's 12V DC system, WITHOUT A 12V DEEP CYCLE BATTERY CONNECTED TO THE SYSTEM, when the trailer is connected to 120V 30A shore line?
Yes. In a normally functioning RV electrical system everything should work just fine with or without any kind of battery while hooked up to shore power.
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Old 10-07-2017, 10:12 AM   #5
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Don't forget you need your battery for the emergency brake system of the TT
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Old 10-07-2017, 10:15 AM   #6
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IMO, any 12v battery would be OK. Without a battery, there could be an issue with high current draw situations - running jacks or slides for example - without the amperage available from a battery. I haven't tried it so have no direct experience.
X2 on this.
The current output from your converter is limited, and some of your devices will try to pull more than it can deliver. (slides and jacks have been mentioned)

Part of the reason for having a battery is to act as a reservoir for those times when you need a little extra "grunt" (that's a technical term...) than the converter can deliver alone.


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Old 10-07-2017, 11:13 AM   #7
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Originally Posted by oldmanAZ View Post
Do you mean specifically "WITHOUT A 12V DEEP CYCLE BATTERY" or do you mean without ANY 12v battery?

IMO, any 12v battery would be OK. Without a battery, there could be an issue with high current draw situations - running jacks or slides for example - without the amperage available from a battery. I haven't tried it so have no direct experience.
X3 you will need a battery for high amperage draw situations...
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Old 10-07-2017, 04:08 PM   #8
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Without 12v battery

I meant without any battery installed. Once a seasonal connects to a 120v 30A shore line- donít they just remove the 12v battery, or do they still need it? I assumed when connected to shore Line the converters job is twofold 1- Power the travel trailer, and 2- keep the battery topped off, or is that an inaccurate assumption?
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Old 10-07-2017, 04:09 PM   #9
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Nope! Just trying to understand what’s causing an issue with my -12 volt power system.
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Old 10-07-2017, 09:38 PM   #10
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Current (no pun intended situation)

Okay... installed new 12V deep cycle marine battery last night... all is working fine, including the heater, all night long. This morning, after 12 hours, the battery was reading 12.27V, turned the heater off. This evening, after 24 hours post battery installation, the battery was reading 12.11V. I believe that the "charger" side of the converter/charger is failing. Does this seem right?

Inline 30A battery fuse, on-board converter 30A reverse polarity fuses, all 12V panel fuses, and all circuit breakers are in proper working order.
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