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Old 09-18-2014, 10:34 AM   #71
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Re: Searching for the nebuchadnezzar

Quote:
Originally Posted by Locutus
When using your batteries for power, DC appliances and lighting will be more efficient because you won't have conversion losses, assuming your DC wiring is of sufficient gauge to minimize voltage drop.
While on the topic of wire gauge and voltage loss, here is a nice calculator to figure out wire gauge. Try to keep your voltage loss within 1-3% and you'll be doing great!

http://www.solar-wind.co.uk/cable-sizing-DC-cables.html

As if you needed another resource right now
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Old 09-18-2014, 07:15 PM   #72
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Re: Searching for the nebuchadnezzar

Thanks guys, I actually have that book its excellent, it was that 12v thing that had me confused. So I've been scouting for a generator, I'm thinking diesel would be the best way to go, but they are not as plentiful used as gas. Propane genset seems to be a good option too. There is also quite a bit of room under the bus, I suppose I could install a marine gas tank. What do you use, if you use one?
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Old 09-21-2014, 05:04 PM   #73
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Re: Searching for the nebuchadnezzar

The nebuchadnezzar finally came up up on the First Student sale list, will hopefully have him home soon
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Old 09-21-2014, 07:16 PM   #74
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Re: Searching for the nebuchadnezzar

A 2 or 2-way fridge does require 12VDC to power the control board. Without it the fridge will not work normally (it can be "hot wired to test though).
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Old 09-21-2014, 08:03 PM   #75
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Re: Searching for the nebuchadnezzar

Thank you
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Old 09-21-2014, 09:29 PM   #76
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Re: Searching for the nebuchadnezzar

Good luck on your hunt!
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Old 09-22-2014, 09:36 AM   #77
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Re: Searching for the nebuchadnezzar

Thanks Doc.
I've been learning about RV electrical systems for my build and there seems to be disagreement regarding pure sine wave and modified sine wave inverters and what you can run using them. The pure is considerably more expensive though probably worth the cost if modified is going to ruin expensive appliances and such. Some folks say that there are very few things that actually need pure sine wave? Any advise would be appreciated.
Thank you
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Old 09-23-2014, 12:01 AM   #78
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Re: Searching for the nebuchadnezzar

Modified sine wave is murder on AC motors. It is not the easiest on switching power supplies either. In short, use nothing you love on modified sine wave inverters.
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Old 09-23-2014, 05:52 AM   #79
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Re: Searching for the nebuchadnezzar

Quote:
Originally Posted by Timelord
Modified sine wave is murder on AC motors. It is not the easiest on switching power supplies either. In short, use nothing you love on modified sine wave inverters.
other than fans,and water pump, what else would be considered A/C motor?
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Old 09-23-2014, 07:24 AM   #80
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Re: Searching for the nebuchadnezzar

actually any electronic digital timers is effected, like microwaves, clocks and coffee pots...never really effected us in the last few years.

turn coffee pot on when we need coffee (don't use timer feature)

really don't care what time it is (microwave clock never gets set)

and the clock we use (very seldom is normally running on invertor)

I always use my laptop while driving off an invertor never a problem (also has the older "brick" charger this makes a difference the internet told me )

the laptop thing I have been doing for years in multiple vehicles and always used invertors (cheap ones also like the B&D 500 watt is a tank and 5 years old probably)

Also have an old aluminum cased no name ~$15 400wt that we run a small crockpot for dip with, it's an antique

and our fridge runs 10 hr days while traveling off the invertor

I have had good luck with modified sine wave invertors, I just never had the extra cash when an invertor was needed, so I always got mod. sine

True sine wave are a lot cleaner in power (I have read)

Also their is an unwritten rule about using 85% of an electronic devices rated output for max life...seems to work that way

I have 2 cobra 3000 watt (1500 nominal) and biggest load it see's is 930 watts (microwave and fridge while on the road)

don't forget to power invertors you need enough 12v amps and the correct wire size to run them, I only use microwave while bus is running (this lets me also use the alt to help power it)

Keep invertors close to batteries (separate compartments) to minimize the big cables you need to feed them 12V
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