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Old 10-01-2015, 09:33 AM   #11
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I agree. I don't plan things out too far ahead either.
You gonna leave the interior paneling or is it coming out?

Sweet Bimmer, too.
Thanks. The lower paneling has been removed and will be replaced with something different when I get the that point. I'm thinking about keeping the ceiling panels, but it will all come out at some point to replace all the insulation with spray foam.

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Lookin' good!

The Xantrex Prowatt series invertors are 90% efficient.
Thanks. I will for sure look into those. I will still run as much as I can off 12v in effort to be as efficient as possible overall.
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Old 10-01-2015, 02:06 PM   #12
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Bimmer lovers and skoolie lovers are alright by me. I like your design goals. I tried my best to keep things simple, too. The 11" basement you describe is an interesting idea. That sure will be a LOT of room to fill! do you think it will all be filled with tanks, etc, or will some be storage? I think a composting toilet is much simpler than an incinerating one, though Ive only used a composting unit. I can **** in it for 3-4 weeks easily before i need to empty it, which is really not a terrible process at all. Good luck!
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Old 10-01-2015, 02:37 PM   #13
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Bimmer lovers and skoolie lovers are alright by me. I like your design goals. I tried my best to keep things simple, too. The 11" basement you describe is an interesting idea. That sure will be a LOT of room to fill! do you think it will all be filled with tanks, etc, or will some be storage? I think a composting toilet is much simpler than an incinerating one, though Ive only used a composting unit. I can **** in it for 3-4 weeks easily before i need to empty it, which is really not a terrible process at all. Good luck!
I think I will definitely have all my wiring and plumbing in the basement as well. There should be room for storage though too since I am skipping the waste tank. Also one I am contemplating not having a dedicated bedroom and putting the bed under the floor in the living room.
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Old 10-01-2015, 02:48 PM   #14
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Lookin' good!

The Xantrex Prowatt series invertors are 90% efficient.
To my understanding, this is only true with higher voltage battery banks.

The higher the batter bank voltage, the more efficient the inverter becomes.

That's part of why people run 48 volts and higher. Almost no one living off grid uses 12 volt battery banks.

I intend to run as high a voltage as I can. I think the inverter I want will use 96 volts.

Nat
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Old 10-01-2015, 03:05 PM   #15
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To my understanding, this is only true with higher voltage battery banks.

The higher the batter bank voltage, the more efficient the inverter becomes.

That's part of why people run 48 volts and higher. Almost no one living off grid uses 12 volt battery banks.

I intend to run as high a voltage as I can. I think the inverter I want will use 96 volts.

Nat
Off grid power is one area I need to do a lot more research on. I was thinking that running a lot of stuff like lights and what not off of straight DC rather than converting to AC because of wasted power in the conversion.
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Old 10-01-2015, 03:26 PM   #16
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Nat's right as there is a lot to gain from running higher battery voltages, but then you will need step-down converters to run your 12v stuff which will make things more complicated and they arent 100% efficient, either. Its a balance. I run a 24v bank, and dont give up any electrical comforts with my setup but if your needs were small enough, and didnt plan on putting in or taking out large amounts of energy quickly, you could make it work at 12v and keep the system small and cheap.
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Old 10-12-2015, 09:15 AM   #17
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Well, I've been working away at this thing prepping for the roof raise. I have a map in mind of just how I'm going to accomplish it. So since it's suppose to be nice here for the next couple weeks with no rain I figured it was a good time to get started on pulling out the stuff that makes it weather tight. So all the windows and the rear door have been removed. Preliminarily the cutting will happen tomorrow.
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Old 10-12-2015, 10:11 AM   #18
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Looking forward to the raise.

Nat
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Old 10-12-2015, 10:52 AM   #19
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Originally Posted by nat_ster View Post
To my understanding, this is only true with higher voltage battery banks.

The higher the batter bank voltage, the more efficient the inverter becomes.

That's part of why people run 48 volts and higher. Almost no one living off grid uses 12 volt battery banks.

I intend to run as high a voltage as I can. I think the inverter I want will use 96 volts.

Nat
http://www.xantrex.com/documents/Pow..._1000_2000.pdf
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Old 10-12-2015, 01:48 PM   #20
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Nat's right as there is a lot to gain from running higher battery voltages, but then you will need step-down converters to run your 12v stuff which will make things more complicated and they arent 100% efficient, either. Its a balance.
You could just run leads to just 12v of you system as long as you are running low draw things (LEDs and the circuit board of the fridge) I don't see how it would tax those cells too much. Or as long as yo stayed below 36v on your bank you could just get a 600w DC/DC step up/down and have a 600w 12v system they are about 92-95% efficient.

Think of changing current like changing money the closer they are to each other the easier it is Canadian$ to US$ but when they start to get much different Mongolian Tugrik to US$ it starts to get interesting. It is also easier to step down than step up everyone wants US$ not as many people want CA$ and fewer want Mongolian Tugriks.

If you already have gobs of 12v devices it wouldn't be a dumb idea to runs 12v bank if not higher voltage banks are easier to get 110v out of less hoop jumping to get the all desirable amps out of because that is what we are really after.
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