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Old 01-15-2019, 07:40 AM   #1
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5th Wheel Electrical System

2007 30' 5th wheel.
Electrical Issue "Perhaps" Looking for feedback.
Older RV / 2007 / 30 amp service
Only 1 battery in my rig which I recently replaced with RV battery.
Problem Description (s):
When I run the furnace my fridge will shut off as the battery drops to a low level. Battery monitor shows only 1 LED (low)
Once the furnace goes off fridge will come back on after a very short period of time.

After a short period of time when not using much power battery monitor will show fully charged.

I believe i need battery even when on park 110 V power to run even non 12V appliances.

1) Is it normal for battery to drop to a low level when using a few appliances?
2) As I require a battery is it likely that I am on an inverter which is old style?
3) I believe if I'm running my furnace and fridge turns off even though it is on auto it does not switch to gas automatically but once fridge comes back on and battery is at half decent charge I can switch between electric or gas.
I do not believe I have a problem with fridge as it normally functions extremely well.
4) Could my inverter need replacing or upgrading?
5)Could this condition improve if I added additional batteries as I only have 1 and its a 30 amp service? Even though I'm on park 110V.
5)When my battery drains showing a low level on my monitor does this put my battery at potential for damage or is the monitor only showing its low but still within the safe range of depletion?

Any feedback advice would be appreciated
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Old 01-15-2019, 08:04 AM   #2
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You probably have a Converter that charges the battery, not an inverter. ( Inverters make 120 volts from batteries. )

The converter should be keeping the battery charged and supplying its rated output, typically 45 to 55 amps.

Even without the battery, the converter should power everything. That's what needs to be checked.

The fridge needs 12 volts for the electronic controls, whether on gas or electric, so thats why the fridge kicks off. Once the heater fan stops, the battery recovers enough to run the fridge.

If over time, the battery volts come back up, it indicates some output from the converter. Look for loose connections. If all seems good, your converter may be bad.

As a test, you could hang a 10 amp battery charger on the battery and see if it makes it thru the night.

As a side note, some " RV " batteries don't have much storage capacity. There are specs on every battery, see what you got.
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Old 01-15-2019, 09:40 AM   #3
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Hi ! Welcome to IRV2! We're sure glad you joined the gang!

There should not be a problem using the fridge and furnace at the same time. It sounds like the converter is not charging the battery properly or you have a bad battery. Did you replace the battery with one having the same or higher cold cranking amps rating as the old one?

Good luck, happy trails, and God bless!
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Old 01-15-2019, 12:10 PM   #4
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You have a battery that is NOT holding a charge....should have it load tested


You have a converter that is NOT properly functioning....should be able to supply FULL DC System demands AND maintain battery charge


*Disconnect Battery POS Cable at DC Dist Panel.....
With 120V AC power ON---measure converter DC Output at DC Dist Panel (where converter wire connects). COnverter DC Output should be 13.2V Minimum
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Old 01-15-2019, 12:31 PM   #5
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Quote:
Originally Posted by Old-Biscuit View Post
You have a battery that is NOT holding a charge....should have it load tested


You have a converter that is NOT properly functioning....should be able to supply FULL DC System demands AND maintain battery charge


*Disconnect Battery POS Cable at DC Dist Panel.....
With 120V AC power ON---measure converter DC Output at DC Dist Panel (where converter wire connects). COnverter DC Output should be 13.2V Minimum
Agreed, load test your battery, it likely has an internal short. As well this can be consuming your convertor output.
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Old 01-18-2019, 03:23 AM   #6
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Thanks for the feedback so far.
I did hook the battery up to a battery charger and immediately the the monitor showed full charge. I left the charger on overnight all functioned properly. After disconnection from the charger the monitor dropped slightly but not as low as previous,
The battery is new but may be insufficient in AH or perhaps a dead cell or short.
Checking all this today.
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Old 01-19-2019, 08:07 AM   #7
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Without a load test, your sitting voltage will not tell you much. If you do not have a battery load tester, a local battery sales place will usually test them for free.
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Old 01-20-2019, 04:49 AM   #8
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New findings
Checked my converter at the terminals and it shows 14.7 V with no load
Disconnected battery and checked showing 11.9 V
Terminals coming into battery from converter show 14.2 V
I am assuming converter is putting out additional voltage to charge

I re connect everything and start the furnace.

Under load the battery is showing 11.3 V
Converter cables at battery showing 11.3 V
At the converter leads 11.3 V while under load.

I am assuming my converter is not supplying additional v under load and needs to be changed.
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Old 01-20-2019, 07:39 AM   #9
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Or the battery is bad and is pulling the converter voltage down. Disconnect the battery and see if everything works correctly. The converter should power everything fine with no battery connected. If it does not then you have found the issue. Bad converter. Yes continually running your battery down below 12 volts while no under load will damage the battery.
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Old 01-20-2019, 09:15 AM   #10
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Disconnect the battery and try the heat and other 12 volt devices.

The converter is designed to operate the RV up to its rated amp output capacity, without a battery.

If the converter handles the load, I would suspect that the battery is the problem. Has it ever been frozen ?
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Old 01-21-2019, 03:03 AM   #11
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Battery has never been frozen as it is brand new
However when I put a charger on the battery the furnace and 12 V system function properly.
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Old 01-21-2019, 04:05 AM   #12
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If you have a Walmart nearby, they will test batteries for free.
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Old 01-21-2019, 04:22 AM   #13
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You say the battery is good, but you need to put a charger on it to make things function ?

That's a red flag right there. A good battery will run the RV.

Confirm a good and charged battery and good connection on the positive cable and negetive cable/ ground, between the converter and battery.

There has been cases where the converter wire connection is loose behind the fuse panel.
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Old 01-24-2019, 08:14 AM   #14
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5th Wheel Electrical System

Issue resolved-
New converter ordered and installed.
All systems are functioning properly.

Thanks for all the input and feedback
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