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Old 08-12-2018, 11:29 PM   #41
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Name: Alan & Penny
Trailer: Armadillo
British Columbia
Posts: 29
45!? Look out moon, we’re getting close to escape velocity here! But then along comes my wife and has it done in 2 minutes with a piece of old 2x6. [emoji3]
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Old 08-13-2018, 08:21 AM   #42
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Name: Gordon
Trailer: 2015 Scamp (16 Std Layout 4) with '15 Toyota Sienna LE Tug
North Carolina
Posts: 5,156
Test your RV Electrical knowledge!

I stumbled across this RVIA study guide for their RV Electrical Specialty Certification with a practice test pool of 156 questions (with answer key). Some readers of this thread might enjoy taking the test and amateurs like myself can learn a thing or two from the correct answers.

http://rvst.org/candidate/SG/Electri...dy%20Guide.pdf

Note that unless I am not understanding the question, number 112 has an incorrect answer in the key.
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Old 08-14-2018, 08:08 AM   #43
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Name: Paul
Trailer: '04 Scamp 19D, TV:Tacoma 3.5L 4door, SB
Colorado
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Agree, I would call it B, or even better, D. The words "in compliance" seem to me to be all that is needed. I do not like multiple choice tests, anyway.
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Old 09-05-2018, 08:32 AM   #44
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Name: Carl
Trailer: LiL Hauley
Syracuse, NY
Posts: 660
I am a retired EE. I worked on uninterruptible power supplies UPS and emergency standby engine generator systems for 18 years. The largest system had 8 MVA of ups power and 10 engines in parallel. I designed the control systems and facility monitoring systems. Some of which involved circuit board design. The most exciting time was when a fellow engineer racked in a 4000 amp 480 volt circuit breaker (the substation feed to the building) and due to sloppy wire dressing, shorted a voltage tap wire to ground. It let all the smoke out of the circuit breaker and its associated fuse truck. I still don't know why the arcing stopped, however I suspect it was a substation automatic circuit breaker trip and reclosure.



I left that job and designed electrical systems for fire trucks for a few years, then worked for a defense contractor designing power systems for military mobile radars.
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Old 09-05-2018, 10:05 AM   #45
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Name: JD
Trailer: Scamp 16 Modified (BIGLY)
Florida
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Quote:
Originally Posted by Doctor Harold View Post
Oh, I know about the magic smoke, I've owned five British cars, and there's no magic smoke like Lucas magic smoke!

Lucas the British Prince of Darkness.

The reason the Brits drink warm beer - Lucas Refrigerators
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Old 09-05-2018, 10:23 AM   #46
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Name: Harold
Trailer: 1975 Scamp, 13-foot
Redding, California
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First time I've heard that one!!

Quote:
Originally Posted by redbarron55 View Post

The reason the Brits drink warm beer - Lucas Refrigerators
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Old 11-27-2018, 08:38 PM   #47
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Name: George
Trailer: 83 Burro
Illinois
Posts: 69
I'm a EE too. I've been a power supply supply specialist for about 20 years. I'm looking for a battery charger that can run off a 40W solar panel, 12V from the car battery, or 110V AC. I haven't been able to find much that is available. I know this isn't a difficult thing to design. Either there's not a market for it, or I'm looking in the wrong places. I thought about making my own, but I know that making the PC board, getting components, packaging, etc. at low volume will cost a lot more than anything I can buy. I may just buy individual converters and plug then in as needed if I can't find anything. Does anybody know a good source for battery chargers that can run off solar, 12V, or 110V AC?
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Old 11-27-2018, 09:07 PM   #48
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Name: JD
Trailer: Scamp 16 Modified (BIGLY)
Florida
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What voltage are you looking for?
If 12 then there is no need for the 12 volt.
If you are charging a 12 volt battery I assume you are asking about a charge controller for a three of four step charging profile.
One thing I have thought about is using the charge controller in the PD4045 driven by either solar panels or the bridge rectifier in the power supply built in.
If you are looking for small but cheap then Harbor Freight makes some maintainers that work, but for me they generate too much RFI to have around the house.
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Old 11-27-2018, 09:08 PM   #49
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Name: John
Trailer: Escape 21, behind an '02 F250 7.3 diesel tug
Mid Left Coast
Posts: 2,943
Normally, your car battery should be disconnected when the car is off, there's a isolation relay in the vehicle that shuts off the power at the trailer connector, this to prevent the trailer from discharging your car battery and leaving you dead. when the car is running, the alternator provides charging voltage/current.

the standard RV 'power converter' doubles as a charge controller when you're on 120VAC.

a solar charge controller can be hooked to the trailer battery in parallel to the charge controller, thats the standard practice. but, 40W solar? thats less than 3 amps at 14V, not really enough to charge a typical 100AH trailer battery. my Escape has 160W worth of solar panels on the roof, and a 30A solar controller, which can support twice the number of panels.
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Old 11-27-2018, 10:08 PM   #50
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Name: CalCop
Trailer: Casita
California
Posts: 232
I'm not an EE nor do play one on television. However, I did stay the night at the local Holiday Inn. Now I know just enough to keep the magic smoke contained
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