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Old 04-02-2024, 10:57 AM   #1
jwfrede
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DC to DC Controller

I want to install a DC to DC Charger in my 27SGS Fifth wheel. Does the power come directly to the buss bar in the battery compartment?
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Old 04-02-2024, 11:17 AM   #2
chuckster57
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When I installed a couple months ago I ran the output directly to the battery.
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Old 04-02-2024, 11:19 AM   #3
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So I guess you pulled the existing wire off the buss bar to use as input to the DC to DC charger?
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Old 04-02-2024, 11:33 AM   #4
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I installed it in a Lance trailer. Leads came from tow vehicle and I used Anderson connectors. Charger was installed in front compartment, trigger was the clearance light.
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Old 04-02-2024, 12:13 PM   #5
jwfrede
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I should probably be a little clearer on the information I am looking for. I cannot physically trace the power wire from the input cable to the battery buss bar. I think I can find the wire on the buss bar by use of a meter.

However, I don't know if there is a line coming off that power wire before it gets to the buss bar. I think it would be poor practice to pull power off the line but it could be done to power a connector for a trailer(my fifth wheel has a hitch). Just wanted to know if anyone had looked into this.

Also, I have been assuming the power goes directly to the battery and not to the DC panel and from there to the buss bar. So my origninal intend was confirm this.

And, assuming I pull a wire off the buss bar for input to the DC to DC charger I would want to put a fuse or circuit breaker in the line before going back to the buss bar.
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Old 04-02-2024, 12:39 PM   #6
NH_Bulldog
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Sorry for this question, but what does one need a DC to DC charger for?

I understand the general concept, but at what point does something like this go from "might-be-nice-to-have" to "need-to-have"?

My new 5er will have a 12v refrigerator and SolarFlex 440i with dual 100ah lithium batteries. My truck has dual batteries and dual alternators (397 amps). Is that enough or is the truck battery vs trailer battery type an issue?
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Old 04-02-2024, 01:02 PM   #7
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Quote:
Originally Posted by NH_Bulldog View Post
Sorry for this question, but what does one need a DC to DC charger for?

I understand the general concept, but at what point does something like this go from "might-be-nice-to-have" to "need-to-have"?

My new 5er will have a 12v refrigerator and SolarFlex 440i with dual 100ah lithium batteries. My truck has dual batteries and dual alternators (397 amps). Is that enough or is the truck battery vs trailer battery type an issue?
There are a number of reasons for the DC to DC controller. Most explained in this article

https://www.rvtravel.com/dc-to-dc-ch...r-rv-rvt-1081/

Due to less internal resistance, lithium batteries can be charged and discharged much faster than conventional lead acid batteries. A discharged lithium battery can demand more amperage than your alternator can readily supply. Overloading and damage to your alternator can occur when this happens.

Maybe no issue for you.

Put your question to google. Lots of links that discuss.
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Old 04-02-2024, 01:07 PM   #8
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Great informative article, thanks for the info!
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