Help Needed - installing a disconnect switch and a battery charger - Page 2 - Fiberglass RV


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Old 03-11-2016, 02:22 PM   #15
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Joe, I agree that the cutoff switch should accomplish the same goal as the SPDT.

The reason to isolate the battery with a switch?
(1) That's the best way to ensure it gets fully and properly charged.
(2) As others have mentioned, you can also use the cutoff switch to prevent the battery from being discharged when the camper is not being used.
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Old 03-11-2016, 02:38 PM   #16
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Thanks John! I just needed to understand. I dont want to do it wrong. But you do have me thinking about the SPDT because Im starting to 2nd guess the idea of the Ctek hooked up and plugged in while boondocking - even tho the 110v outlet is dead. As was mentioned earlier, and your reasons too - gremlins. The SPDT kills that gremlin path and does seem like a solid approach.

I sincerely appreciate it John, and all who helped me! I think I have a plan!
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Old 03-11-2016, 03:35 PM   #17
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The charging portion on my Scamp converter failed . I cut the leads from the converter's charger (line side) in half and taped off the half coming from the converter's charger. I then took the 12 VDC leads from my new smart charger and hooked them up to the half of the wires going to the battery / converter (Load ). Everything will work as it normally does . You could also put a SPDT switch in line as mentioned above so you could run either charger to charge your battery.
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Old 03-11-2016, 04:44 PM   #18
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Joe, in boondock mode, the CTEK charger would still be attached to the battery. You could simply disconnect the CTEK charger from the battery. It comes with a quick disconnect charging cord. Even if you don't, according to the CTEK charger manual, this charger has only 1 amp hour per month back current drain. "Back current drain is the current that drains the battery if the charger is not connected to the mains. CTEK chargers have very low back current."
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Old 04-03-2016, 08:44 PM   #19
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Well I have her finished! I installed a battery cutoff switch inside the Casita which is cutting off the positive side. Then I installed a new switched 110AC recepticle outlet off of the spare breaker and plugged the ctek into it. Then ran the +/- leads on the ctek to 2 more dc switches. Then from those switches to the battery +/- hooked up the the battery side of the cutoff switch.

Now I can switch the battery off and on, I can power the charger off and on, and I can switch off the leads going from the charger to the battery to prevent any back current. Now I never enter the battery compartment!

I charge battery while its plugged into shore power and switched off from the Casita. I turn off the charger and I switch off the ctek +/- leads while battery is on for boondocking!

All switches and outlet are under the side dinette seat so no visible stuff.



Thanks EVERYBODY for your help in this topic!!
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Old 04-03-2016, 09:05 PM   #20
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Joe, that's a great setup. Let us know how it works out.

-John
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Old 04-09-2016, 04:55 PM   #21
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Quote:
Originally Posted by JWScarab View Post
Guys, I have a '05 Casita SD17.

CTEK Multi US 4.3 - CTEK Battery ChargersCTEK Battery Chargers

1st - I have 2 wires going to my battery + now and one of them tests 12+V when plugged in.

You may have the battery connected backwards!

Your Casita when new had only had one wire, a BLACK one, on the POSITIVE battery terminal.

And a GREEN wire and a WHITE wire on the NEGATIVE terminal
The green goes to frame ground on the trailer.

The charger in the converter connects to battery voltage in the converter.

Joe
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Old 04-09-2016, 08:59 PM   #22
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I had it typed backwards. I do have it hooked up correctly! All seems to be good. Thanks!
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