Opinion needed - Page 2 - Fiberglass RV


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Old 11-24-2012, 01:11 PM   #15
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Thank you thank you very much . Alot to think on ,now im leaning to solar w/12v
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Old 11-24-2012, 01:12 PM   #16
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Thank you thank you very much . Alot to think on ,now im leaning to solar w/12v

If you are trying to keep down weight, silicon definitely weighs less than lead.
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Old 11-24-2012, 02:19 PM   #17
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Before a loooong discussion is started.

Recharging your rigs battery with jumper cables is a lot more efficient than the charging line method. "Most" charging lines, due to wire size and length, may limit recharge rates to about 5-8 amps, where-as a direct connection with a set of heavy jumper cables may allow upwards of 50 amps to flow.

We proved this just yesterday with a GMC Yukon. Through the 7 pin plug we could only move 5.6 amps at 1200 RPM. With a very heavy jumper cable connected battery to battery it jumped up to 36 amps at the same RPM.
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Old 11-24-2012, 02:27 PM   #18
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Before a loooong discussion is started.

Recharging your rigs battery with jumper cables is a lot more efficient than the charging line method. "Most" charging lines, due to wire size and length, may limit recharge rates to about 5-8 amps, where-as a direct connection with a set of heavy jumper cables may allow upwards of 50 amps to flow.

We proved this just yesterday with a GMC Yukon. Through the 7 pin plug we could only move 5.6 amps at 1200 RPM. With a very heavy jumper cable connected battery to battery it jumped up to 36 amps at the same RPM.
50 Amp charge rate??? Boom...
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Old 11-24-2012, 02:31 PM   #19
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"Most" charging lines, due to wire size and length, may limit recharge rates to about 5-8 amps, where-as a direct connection with a set of heavy jumper cables may allow upwards of 50 amps to flow.


When I wired my tug / trailer I used 4 gauge wire which I bought new, but cheaply from a metal recycler.
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Old 11-24-2012, 02:40 PM   #20
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RE: Boom

Yep, if you try to charge for very long at 50 amps you can quickly warp plates and damage a battery. However, most alternators would start cutting back within a few minutes as the battery voltage rises.

In my example, after 30 minutes the 36 amp current (from a 12.25 starting voltage) was down to less than 15 amps.

BTW: I use a Craftsman ac/dc amp clamp multimeter for measurements.
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Old 11-24-2012, 02:49 PM   #21
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Recharging your rigs battery with jumper cables is a lot more efficient than the charging line method.
Any presumed efficiency achieved by this method of charging a battery is lost by the obvious necessity of running a (stationary?) vehicle's engine for the sole purpose of charging a battery. One would do better to use a freestanding generator for the purpose...which would probably make a lot less noise into the bargain.

Since I prefer neither to buy a generator, go down the road with jumper cables attached, nor to sit in a campground with my engine roaring, I installed a heavy charging line. By this method, rather than doing nothing once the vehicle battery is charged, my alternator next charges the trailer battery.

The simplicity of this setup has worked very well for me for many years...others prefer more complicated arrangements.

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Old 11-25-2012, 01:01 PM   #22
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Originally Posted by Bob Miller View Post

Recharging your rigs battery with jumper cables is a lot more efficient than the charging line method. "Most" charging lines, due to wire size and length, may limit recharge rates to about 5-8 amps, where-as a direct connection with a set of heavy jumper cables may allow upwards of 50 amps to flow.
.
Just to clarify, you are not suggesting folks drive all day without a charge line and then recharge their battery at their destination with jumper cables. Rather, after several days of boondocking when a battery dies, it is faster to recharge the battery using jumper cables than the charge line and thus more efficient because the engine would run for less time. Raz
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Old 11-25-2012, 02:30 PM   #23
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Correctomundo.... My suggestion of charging with jumper cables was for use only when recharging at a camp site, after boondocking for several days.

And, BTW: I find that a car at fast idle for 30 minutes is a lot less annoying than any 3600 rpm generator running for 2 hours near my camp site. I have even seen campers that start a generator and then leave for a few hours to avoid the noise.
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Old 11-25-2012, 02:33 PM   #24
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.......... I have even seen campers that start a generator and then leave for a few hours to avoid the noise.
But then how would they know who poured sugar in the generator gas tank?
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Old 11-25-2012, 03:10 PM   #25
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And, BTW: I find that a car at fast idle for 30 minutes is a lot less annoying than any 3600 rpm generator running for 2 hours near my camp site.
This is probably true if it's your car...and most generator users believe their generators to be a lot less annoying than a neighbor's running engine.

People are never bothered by their own noise!

Francesca
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Old 11-25-2012, 03:25 PM   #26
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Lets put it this way.
I can stand next to a GMC Yukon (Like a Surburban) running at fast idle and still hear a 3600 RPM built in generator running 5 campsites away, I am sure that the opposite isn't true.

Note that I am talking about the usually built in, 3600 RPM generators, many of which are now illegal in National Parks due to noise levels, not inverter generators like the Honda 2000EU
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