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Old 07-21-2003, 11:01 AM   #29
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I think, but I don't know, that small generators that use inverter technology, like the Honda and Yamaha, to generate their AC are less prone to engine rpm induced frequency variation. That being because everything's being artifically, if you will, created.
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Old 07-21-2003, 03:41 PM   #30
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hmm.. that could be the case. I hadn't seen anything like that but it makes sense, bringing us back to the inverter output characteristics...

thanks.
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Old 07-23-2003, 10:12 AM   #31
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Huh?:m I think my brain just blew a fuse.:wak

I vote screen door.:chased

Dina (& Jim) Schulz
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Old 07-24-2003, 01:48 AM   #32
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Lions and Tigers and bears - oh my!

I think that for what you are trying to do, a 450 CCA sealed car battery would have enough juice to run the lights all night and a 12 volt fan,(available at Wal Mart for $12.00.) Check out the batteries at NTB or Sams Club and get a heavy duty battery for $75 and install it in the jeep. The jeep alternator is designed to keep the spare battery charged which should not be connected to the main battery when the ignition is off. (At least on the old CJ it wasn't.)
There is a hot wire on the 6 and 7 prong plugs for running accessories in the trailer.
Put a 15/20 Amp circuit breaker (4 at Ace)in a protected area near the battery.Hook your hot lead from the plug to the load side of the breaker. Make a battery tap out of some 10 guage braided wire and crimp on ends to put on the battery clamp back to the input side of the breaker... It sounds more complicated than it is.
I just finished 17 days out to Oregon and back and the truck kept the Casita battery charged. We hooked up the fan to a bullet plug in the trailer at night when it was hot in Nebraska and slept well. It ran all night without depleting the battery.
I'm too cheap to buy a generator but the laptop has a plug adapter for the truck and trailer. Sam penny pincher. :o
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Old 07-24-2003, 04:17 PM   #33
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Quote:
Orginally posted by Mark M.

We didnít put much of a dent in the capacity. It still measured 13.5 volts before I put it on the charger when we got home. It took a full charge in just a few hours. I will know more when I take it on a longer trip, but so far so good.

Mark!

Please tell me that it is just an error and that it should be 12.5 volts instead of 13.5 volts. Otherwise, I give up trying to learn about battery!!:weep

I have never heard of a (non even full) battery at 13.5 volts. :shg

But I could easily be wrong!

Alain
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Old 07-24-2003, 04:38 PM   #34
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no, that's about right. I was trying to find a short on my truck last night and while poking around with my meter, discovered my battery was at 13.8 and thought to myself "well, at least it's not draining the battery with the ignition off."

An alternator charges at around 15V and it's not uncommon to see a perfectly healthy battery up around 14V fully charged...
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Old 07-24-2003, 08:41 PM   #35
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I have a defective WalMart deep cycle battery that will only charge to 12.4 VDC, but Wally's meter prints out "OK", so they think that's fine. My truck starting battery, also from Wally, charges to almost 14VDC.

Despite the lack of full charge on the deep cycle, I have gone several times for 3-4 weeks on it using only a few lights and running the fantastical fan for short times to exhaust cooking vapors. I use my small 12VDC flourescent light for reading, rather than a filament light.

Pete in the RatHaus
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Old 07-25-2003, 11:17 PM   #36
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Isolators

We just bought a 13' Trillium 1976 and it needs a battery among other things. I wanted to mount the isolator in the battery compartment in the trailer. If I run a 8 or 10 guage cable from the truck battery to the trailer with a plug near the hitch and connect it to the "Alternator" terminal of the isolator and connect the positive of the trailer battery to "Battery 1" of the isolator would that not work? The isolator is basically a big double diode, but in this case I would only be using one diode. Does anyone see any problem with this? One thing that could happen is that the truck battery could be drained if it is connected to the trailer and there is a lot of load on the trailer electrical, like the fridge. Has anybody tried it this way? Appreciate any replies.<img src=http://www.fiberglassrv.com/board/uploads/3f22009088ba6Dscf0238s.jpg/>
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Old 07-26-2003, 11:37 AM   #37
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Phil and Dan

If you hook it up that way it seems that the female connector at the rear bumper will always be hot.It also seems that you could drain the battery in the tow vehicle,

I usually use a ignition switch controlled heavy relay at the battery so that I will only supply electricity to the trailer when the ignition is on.

Be sure to install a fuse between the battery and the relay. I use a 20 amp fuse. I am not in favor of a relay here because in the event of a short you will get electric pulses as the relay cycles.
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Old 07-26-2003, 02:05 PM   #38
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Not from my own personal experience, but from my readings on other forums, the best way to isolate is with a 12VDC relay under the hood (opinions differ as to whether this should be a relay designed for the purpose or a less expensive starter relay).

Problem with using a diode is that the voltage will drop 1/2 Volt across the diode. Doesn't sound like much, but there is a big difference in capacity between a battery charged to 13.0 VDC and one charged to 13.5 VDC.

Actually, one doesn't really need isolation of the truck battery unless one has something with high amperage, like a 3-way reefer that might be left in 12VDC mode, while the truck and trailer are connected.

Pete in the RatHaus whose isolation comes from disconnecting the umbilical cord
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Old 07-28-2003, 04:22 AM   #39
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Rathaus?

Rathaus?

Pete - For what city is your trailer the town hall? The town hall in Nogales back in the late 60's was a trailer in the train yard....
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Old 07-28-2003, 04:55 PM   #40
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My previous Jayco is the office for a used car lot in the capitol city of Vermont (last I heard), but my RatHaus is NOT really a Rathaus, but rather a Rollin' Haus were I live with rats (a.k.a. Long-Tailed Norwegian Hamsters) as opposed to the kind of Rathaus one finds in Germany, Switzerland and Austria which are staffed with humans of the rodentia persuasion, much like our own various halls of politics.

Hope that clears things up,

Pete in the Rollin' RatHaus, currently not rollin' in Silverton Colorado, home of millions of flies...
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