Starflyte68
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1968 Shasta Starflyte
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Post by Starflyte68 on Aug 22, 2022 20:33:21 GMT -8
I am completely revamping both AC and DC systems in my 1968 Shasta. All lights are getting switched over to DC (12V)). AC will be for a few outlets, an air conditioner, probably the refrigerator and a microwave (though there are 12V options I might consider).
Trying to describe this question as simple as possible... in short, I want my 12vDC to be powered via 110vAC Shorepower when available, but also to run my 110vAC fridge and outlets via the 12vDC when boondocking. Thus I need a converter (or at least a battery maintainer) for 110vAC to 12vDC and an inverter for 12vDC to 110vAC. Diagrams help, even when roughly jotted with a cat jumping repeatedly on the desk. So the image below is an attempt at where my mind is currently at. The red letters refer to specific questions.
Question A: Would one of these switches [ www.amazon.com/gp/product/B0B2DJ4KBM ] be necessary? Otherwise, the 110 would potentially be supplying the wrong end of the inverter - I don't know if that is a problem or not. I suppose also the inverter power would go back through the breakers and end up supplying the air conditioner too (which I don't want as it would put too much load on my batteries). If not that switch, then what?
Question B: Do I need something to regulate power flow going to the batteries? Or do they simply charge up to match the voltage in that part of the system? If I do need something, then recommendations are welcome!
Thanks!!!
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Post by vikx on Aug 22, 2022 23:11:58 GMT -8
First figure out which Converter you want and then which Inverter you want. You will need a transfer switch to use one at a time. Big motor homes often have both; a good place to ask questions. A maintainer will not provide enough power for that big of a DC system. They are more for maintaining the battery.
Your link doesn't work for me.
A Inverter powering what you have listed will take a large battery bank unless you upgrade the batteries. There are some pretty fine batteries available today, do your research. Many can cost $1500 and up each for the best. If you are going to be using the batteries to power a lot, worth the investment.
Air conditioners normally run on a 20 amp circuit with appropriate wiring. You can plug it in separately (bypassing the trailer electrical) to the campground pedestal to prevent overloading the system.
Most converters today have a built in smart charger, so they auto regulate the battery charge.
Study the inverter and converter manuals and also research what others with this type of system have done.
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Starflyte68
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Posts: 21
Likes: 8
1968 Shasta Starflyte
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Post by Starflyte68 on Aug 23, 2022 6:35:24 GMT -8
Thanks Vikx - link is fixed in original post.
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Post by vikx on Aug 23, 2022 10:56:18 GMT -8
If your shore power inlet is 30 amps, I would upgrade the switch to 30 amps.
Honestly, I have very little experience in this type of system. I would ask for info from folks who already have one. Most modern motorhomes do.
Also research lithium battery systems and new ways of providing DC power. Battery power is amazing these days. One friend is running his entire 12 volt system (including dorm fridge).
Research, research, research. Have fun with it.
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Post by davesshasta16sc on Jul 16, 2023 13:30:52 GMT -8
What was the decision regarding the need for the switch?
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