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Old 08-23-2015, 11:20 PM   #1
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Plumbing & electrics

I've been thinking hard about plumbing and electrics since I'm avoiding the use of propane and gasoline.

This is what I came up with...

Plumbing..
No handbasin, no kitchen sink.
A shower base that empties into a grey tank. All kitchen water and hand washing water gets tipped into it. Also a handy urinal - lol
Water - cold only - comes from under body holding tanks.
There is no electric pump. Instead there is a faucet under the bus (hidden). Also an old fashioned hand pump inside the bus, pointed into the shower base.
Hot water is achieved by heating cold water in a kettle or by dropping a heating element into a bucket.

Electricity.
At the back of the bus is a breaker box. On the side there's a 50A socket with a cover.
Riveted to the body ribs, close to the chassis is a metal conduit that takes 4 electric cables - each on an individual 15A breaker. There are two main breakers that get switched out. A 30A breaker for 30A connections and a 50A breaker for 50A connections.
The four cable s lead to individual 15A sockets.
There might be a 5th cable leading to a 12v battery charger.

Batteries.
There will be two (maybe just one) marine deep cycle batteries.
These will be charged by the alternator via a smart relay.
Also the battery will be charged via mains power.

The battery provides power for extraction fans (computer cooling fans,), USB chargers and power for 120w 12v water heating coils.
Possibly also for laptop charger.

Solar\wind don't figure immediately in my plans. Wind speed in my area is just too low at 3mph. Solar is stupidly expensive at $1.89 a watt.
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Old 08-24-2015, 12:27 AM   #2
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the things I've learned about electrical & plumbing....
1) Electricity will shock the $hit out of you
2) $hit rolls downhill

I've lived almost 50 years with these principles.
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Old 08-24-2015, 12:30 AM   #3
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I like the look of the 12v showers though I might engineer my own. They pump hot water from a bucket through a shower head. Maybe I'll rig up some kind of pull so that I can switch the water on and off while showering.
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Old 08-24-2015, 04:30 AM   #4
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I'm not sure what the intention is behind starting this thread?

I feel this should have been posted in your build thread, so we don't clutter up this site with meaningless threads.

Nat
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Old 08-24-2015, 10:57 AM   #5
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This is a thinking thread, not something I have achieved. The bus build thread is about things that have been achieved.
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Old 08-24-2015, 03:52 PM   #6
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Quote:
Originally Posted by Zephod_beeblebrox2 View Post
power for 120w 12v water heating coils.
Will a 120w heater coil ever heat up more than a cup full of water? Do you have a link? I'm curious...

Quote:
Originally Posted by Zephod_beeblebrox2 View Post
Solar is stupidly expensive at $1.89 a watt.
That's only true for the flexible panels or the expensive 12v stuff they sell at RV places (and you know it ). Solar can be found for near $1.00 per watt.
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Old 08-24-2015, 06:53 PM   #7
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Quote:
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Will a 120w heater coil ever heat up more than a cup full of water? Do you have a link? I'm curious...


I used a cup heater to heat water for my laundry when I was living/backpacking for months at a time in eastern Europe. It took a while! But connected straight to a solar panel during the day...


That's only true for the flexible panels or the expensive 12v stuff they sell at RV places (and you know it ). Solar can be found for near $1.00 per watt.
Flexible is the only way to go IMHO.
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Old 08-24-2015, 08:57 PM   #8
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the things I've learned about electrical & plumbing....
1) Electricity will shock the $hit out of you
2) $hit rolls downhill

I've lived almost 50 years with these principles.
In that order?
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Old 08-24-2015, 11:47 PM   #9
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In that order?
Well, you sure don't want to be at the bottom of a hill when you discover the thing about electricity! Better to learn #1 first!

It's easy enough to figure wattage and temperature rise. Specific heat of water is around 1 Btu per pound per degree F (it varies with temperature), so if we have a mug holding 8 fluid ounces of water at 50 F and we want to raise it to 120 F, that's 0.52 pounds times 70 degree rise so 36 Btu needed (ignoring heat lost to the mug, ambient, etc). That's 0.0106 kw-hr, 10.6 watt-hours, so at 120 watts input it'll take 5.3 minutes (longer in the real world, where the heater doesn't achieve its rated output and heat is lost to the mug etc).
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Old 08-24-2015, 11:56 PM   #10
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Neat calculation. That's about what it took with my Soviet cup heater.

Now, imagine all the power from a 100w solar panel going into 5 gallons of water over 8 hours.

The water will be tepid but warmer than the ambient temperature.
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