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Old 10-22-2013, 05:32 PM   #1
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Question Suburban furnace & WFCO Ultra distribution panel

I'm wondering if the Suburban furnace fan is run off the battery or 110. It seems that whenever the furnace fan kicks on the lights dim dramatically. I've sent out an email to Suburban. Any ideas?
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Old 10-22-2013, 05:34 PM   #2
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Your furnace and lights both run off of 12 volt DC (battery)

Here are more detailed explanations of your RV's electrical systems:

http://rvservices.koa.com/rvinformat...lectricity.asp

http://rvservices.koa.com/rvinformat...d-amp-draw.asp
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Old 10-22-2013, 05:38 PM   #3
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True, except for the ceiling fan lights in our 5er.
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Old 10-22-2013, 05:40 PM   #4
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Correct, and the dimming I've found to be the symptom of the factory putting in the highest gauge wire they can get away with...I'm sure for cost savings. The resistance caused by the thinner wires restricts the amount of power getting to everything, noticeable when you put a heavy draw on it.
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Old 10-22-2013, 06:27 PM   #5
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Correct, and the dimming I've found to be the symptom of the factory putting in the highest gauge wire they can get away with...I'm sure for cost savings. The resistance caused by the thinner wires restricts the amount of power getting to everything, noticeable when you put a heavy draw on it.
It's only a momentary dimming and also takes place in houses when a big appliance is turned on.
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Old 10-22-2013, 06:52 PM   #6
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It called voltage sag, and happens cause the converter takes a few second to catch up to the sudden change in amp draw, and the battery drops a few 1/10's of a volt.
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Old 10-23-2013, 09:23 AM   #7
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I'm new to RVing and spending the winter in a 2005 SalemLe I bought used. So all of this is new to me. The manuals, as with all manuals these days, just seem to glaze the surface. Where I'm parked, on a construction site, I'm boxed in and can't take the RV to a dealer until one of two dirt piles are removed. Long story short, how can I tell if the battery needs replaced? This am the overheads were strobbing while the furnace was running. I checked the battery, it read E. Turned off the overheads it read 1/3. Turned off the furnace, it read full. The battery was replaced, according the records, in 2011. The RV was used one weekend a month during late spring through early fall and then the entire month of October. The unit was always plugged in except when in haul.
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Old 10-23-2013, 09:36 AM   #8
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Rhodeena, are you plugged into a form of 120 volt shore power (ie power outlet, generator)?

If plugged into shore power, your converter (explained in the second link I provided in my previous post above), is what provides the 12 volt power to the items that require 12 volt.

It's possible you may have a converter going bad.......or a battery too.

The converter is also what recharges the battery, when you are plugged into 120 volt shore power. Some converters do a better job of charging than others. It's also possible to boil that water out of a battery if the charger isn't a good 3 stage charger (some are, some aren't).

If not plugged into shore power, then it's all running directly from the battery.
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Old 10-23-2013, 09:41 AM   #9
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I am plugged into a dedicated 30 amp outlet. I've read the first article you sent and I'm preparing to read the second. I put water in the battery this past Friday. I will check to see if it's "boiling" out. Also, I'm the only unit on site.
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Old 10-23-2013, 09:42 AM   #10
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Correct, and the dimming I've found to be the symptom of the factory putting in the highest gauge wire they can get away with...I'm sure for cost savings. The resistance caused by the thinner wires restricts the amount of power getting to everything, noticeable when you put a heavy draw on it.
Dimming under load is nearly ALWAYS a bad ground or battery.

Examine your ground connections. Frame ground screws are notorious for rusting and losing a good connection.
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