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FC (Forward Control Unique Issues) If you have a unique issue with your FC model coach and it can't be answered in one of the other forums here, then this is where you can list it.......List your FC Parts here too.

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  #1  
Old 06-11-2018
Robert & Dianne Robert & Dianne is offline
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Default Voltage too high & blowing fuses when on charge

According to Trojan my 6 6 volt house batteries should be charged at 14.8 volts. When the charger is on and my vent fans are running on high I blow the fuses in the fans. Wondering if anyone else has had this problem and how it was solved? I did call Trojan and asked if I could lower the charge voltage. They felt the lowest I should go down would be 14.7.
Any advice would be welcomed.
Thanks
Robert
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Old 06-11-2018
Harold,Cat&Sam Harold,Cat&Sam is offline
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14.8 is too high . Most converters charge at around 13.8 to 13.6 and return to a float charge around 13.2 when fully charged. Most alternators charge at 13.8 to 14 volts.
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Old 06-11-2018
Alever Alever is offline
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I would go by what the battery manufacturer recommend. We have 20+ battery back up systems where I work and we are suprised by the different float and equalize voltages that the different brands of batteries and even some new replacements take. The UPS battery company technicians tell us that the battery technology and what goes in them keeps improving......even on flooded wet cells. They are having to change setpoints every time we get replacements. We are getting 10 years out of the same batteries that were 7 years in the past. But they have new charging float and equalize settings now.

I know we are at the mercy of what the alternator makes when going down the road. But the longevity of the battery is the equalize and float settings when parked. Which is 99% of the time for most.

Hope this helps.
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Old 06-11-2018
Harold,Cat&Sam Harold,Cat&Sam is offline
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14.8 may be fine for the batteries , but the question remains about the other 12 volt system's. At what point is the voltage too high ?
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Old 06-11-2018
Harold,Cat&Sam Harold,Cat&Sam is offline
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Hopefully someone smarter than me will come along and help. Another thing to consider with regards to the fans is at higher voltage they will draw more amperage.
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Old 06-11-2018
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sfedeli sfedeli is offline
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When winter comes around, internal resistance in the battery requires those voltages- but in summer months, you should be bulk charging at 14.2-14.4 volts and then dropping off to 13.4 or even 13.2 on a warm day. I know the Trojan site recommends 14.8, but that is the "Bulk" rate- when the batteries are depleted. Normally, a smart charger will only put out the high voltage charge for an hour or so when you first plug in. Afterwards, voltage will drop off to a "Float" voltage.

Some components may not like voltages in excess of 15 volts, but I have not encountered that yet. Most fuses will trip due to excessive amps, not volts. Try checking the voltage at your exhaust fan... my guess is that it might be a little low.

From Trojan's website- Correct the charging voltage to compensate for temperatures above and below 80° F (26.6°C). (Add .028 volt per cell for every 10° below 80° F (26.6°C) and subtract 0.028 volt per cell for every 10° F (12.2°C) above 80° F (26.6° C))

https://www.trojanbattery.com/tech-s...y-maintenance/
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Old 06-11-2018
Robert & Dianne Robert & Dianne is offline
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Thank you all
I will check voltage tonight at the fans with the Outback charger on. The float is set to 13.2 and the inverter/charger goes into that mode after a charge cycle. Trojan also told me this morning that if I drop the voltage I will have to equalize more often. Equalize is set at 15.5
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Old 06-11-2018
Harold,Cat&Sam Harold,Cat&Sam is offline
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When did this problem start ?

If the voltage was increased for charging the batteries , then with the fans on high the amperage draw could be a little higher than your fuses can handle. Amperage draw can change according to the applied voltage.

Shane is a Jeti Master , maybe he can verify this .

Just something to check.
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  #9  
Old 06-11-2018
Robert & Dianne Robert & Dianne is offline
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Last year. The problem started when I upgraded Fantastic vent fan with a model that was fused (4 amp)
Also have a problem with a replacement fan motor for kitchen vent fan. It is not fused but has a thermal switch which after about 4-5 minutes trips and shuts down the fan.
I keep wondering if there is a voltage regulator in front of all the 12 volt items that has stopped working.
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Old 06-12-2018
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atckip atckip is offline
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Are you dealing with the kool o matic in the kitchen? That fan used a 10 amp motor and most replacement motors draw alot more. I found my first replacement motor was drawing more and melting the relay
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