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Old 03-03-2010, 03:25 PM   #15
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You'll probably end up wanting two GC-2 golf cart batteries. They should be in an enclosure and vented to outside. You can google dimensions and weights.

You have the converter link.

You'll want a distribution panel: Distribution Panels

Here are some prices on 12 volt fridges: 115 Volt AC /12 Volt DC Refrigerators

This place will have some of the pieces and parts you'll need: http://www.wiringproducts.com/
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Old 03-03-2010, 04:05 PM   #16
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ok, thanks for all the tips.
im trying to calculate how much energy ill use at once. so the formula is

Quote:
So let's say you want to use your 1800 watt Conair hair dryer, run the microwave, and run the a/c. How many amps do you need?

Add up the power ratings:

(1800 watts for hair dryer) + (1500 watts for microwave) + (2000 watts for a/c) = a total of 5300 watts.

OK, you're plugged into 120 volt service. So Amps = Watts/Volts = > Amps = 5300 watts/120 volts = 44 amps. So, there we can see, that on a 30amp circuit, you can't run all three.
That formula will be a big help to you.
teh fridge specs i have only say 292kwh/yr.

kwh= kilowatt hours, and 1000 watts = 1 kilowatt...

but how to i get a watt rating from kwh (kilowatt HOURS?)
----------
UPDATE
----------
i think i got the hang of this. any math teachers in the house?

fridge: 115amp x 1.5 volts =172.5w
a/c = 900w
shower waste pump = 2.4 amps x 12 v = 28.8w
water pump - 12v x 7 amps max = 84 w
lights 30w x 5 lights = 150w
laptop 18.5 v x 3.5amps = 65w
----------
1400 w

1400watts / 120amp = 11.6V

which is way below the 30V service provided.

am i right?
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Old 03-03-2010, 04:53 PM   #17
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Originally Posted by NJtoNC View Post
i think i got the hang of this. any math teachers in the house?

fridge: 115volt x 1.5 amp =172.5w
a/c = 900w
shower waste pump = 2.4 amps x 12 v = 28.8w
water pump - 12v x 7 amps max = 84 w
lights 30w x 5 lights = 150w
laptop 18.5 v x 3.5amps = 65w
----------
1400 w

1400watts / 120volt = 11.6A

which is way below the 30Aservice provided.

am i right?
Yes. I fixed the amps and volts for you but still. You would also have to add the converter in, which is around 5 amps depending on size. Still well below 30a.

That was easy.

Batteries are harder to size because you have to figure run time.

I take it you'll have no heat in the trailer?
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Old 03-03-2010, 04:57 PM   #18
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Quote:
You'll probably end up wanting two GC-2 golf cart batteries.
oy. more math. y'all are killing me!!!

so based on my research - correct me if I'm wrong.
If we want use approx 12amps for 24 hours. with a max DoD of 50% (seems to be whats recommended)...

ah = most amps we can get over 20 hrs

so if
10 Amps X 20 hours = 200Ah

and we use

12amps for 24 hours, it would be the same as using 14.4 x 20 hours, either way, 288ah.

so it sounds like we need twice that to achieve desired dod of about 50%, or 576ah.

2 6v batteries w/ 225 ah = 450ah
or
3 6v batts @ 225ah =675 ah -> probably better for 2 days battery time off grid w/ a/c

is my math right here? note that my calculations are based on running both pumps and a/c 24/7 which won't happen.
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Old 03-03-2010, 05:01 PM   #19
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Quote:
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Yes. I fixed the amps and volts for you but still. You would also have to add the converter in, which is around 5 amps depending on size. Still well below 30a.

That was easy.
Batteries are harder to size because you have to figure run time.
I take it you'll have no heat in the trailer?
Lol. whoops! amps, volts... still working that out in my head...thanks
a/c has heat pump, same energy usage. we don't plan to camp below 40* and if we do ill bring a plug-in electric room heater.
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Old 03-03-2010, 06:23 PM   #20
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A Honda EU3000i or a pair of EU2000i's will help you out a lot too

Maybe I missed it in an earlier post, but I did read through them...what air conditioner is out there that will run off 12v? I've only ever seen 120v ac models for RV's.

I've personally not tried the golf cart batteries...but I know many on here swear by them. I've been considering it. I'd need to build a larger battery box. I may have them mixed up here, but I believe my battery box was originally sized for group 27 batteries. But, the group 27's were made bigger at some point in history than their 1987 dimensions, and so now I can only fit a pair of group 24's. (I may have 24 and 27 flipped....I had to go to the next smaller size battery to get them to fit in the box) At any rate, I have a pair of 750 amp batteries, but I prefer 1000amp or bigger. You can never have too much. Actually, I thought the golf cart batteries were bigger and heavier than the car batteries? Cool if they're not.

1962 you are definitely going to need a new axle. If it were a 1959 I'd say you'd be OK because it should still be leaf sprung, but in '62 they had already gone to torsion type axles and there will be nothing left of the rubber in one that old.

It wouldn't hurt to inspect the frame either. She wasn't built yesterday.

Sounds like a cool project though. Have fun!
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Old 03-03-2010, 07:45 PM   #21
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jim,

I've seen the prices on those 2000 /3000's and my bank card shuttered
I'm trying to avoid the generators b/c i have a feeling i won't re-coup the $$ we spend on it.

still researching on the batteries. 1000 watt batteries sound hardcore!

new axle is researched and ready to order.

amazingly, when we got the trailer it was in near perfect condition. still has bright blue paint on the emblems, warranty label inside closet, and even the wiring looks brand new. this girl must've been in a garage for 50 yrs. only issues were mousies and water tank batteries removed. frame looks solid, not even a bit of water damage to floor. I know, i still have feelings like i should've traded it for a worse condition trailer to reno so this great example would have been preserved.

but trailers were meant to enjoy, not to sit forever untouched. so we reno'ed.
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Old 03-03-2010, 08:41 PM   #22
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If you use an inverter you need a true sinewave inverter. ac motor do not do well with modified wave inverters
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Old 03-03-2010, 10:32 PM   #23
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You can't run the air conditioning from batteries. It just won't work, too much power. You can't run it in cool mode or in heat pump mode.

For battery sizing you figure in terms of amp hours at 12 volts. The amps required will be about ten times the amps at 120 volts, so take that and multiply by how many hours your going to run stuff.

Two GC-2 batteries should give you around 100 amp hours at a reasonable depth of discharge, at 12 volts. That means for a 24 hour stay your average amp draw has to be below 4 amps. Things like the fridge matter most. Water pump matters little because it doesn't run much. Lights, somewhere in between.

If you use an inverter to power stuff, you have to figure that the best inverters available draw about 11 amps from the 12 volt battery for each amp of 120 volt power they produce. Cheap inverters draw more. It's easy to see why running electric heat or air conditioning won't work this way.
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Old 03-04-2010, 08:24 AM   #24
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im sorry im a bit slow at this...
Quote:
The amps required will be about ten times the amps at 120 volts, so take that and multiply by how many hours your going to run stuff.
is there a formula? 10 x 120V x 24 hours?

sorry for the lack of comprehension...
: /
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Old 03-04-2010, 09:05 AM   #25
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the formula is volt x amps = watts
if you run a microwave which is 1000 watts at 120 volts you would need 8.3 amps on 12 volt you need 83.3 amps to run it not including the power that the inverter uses.
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Old 03-04-2010, 09:12 AM   #26
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I want to read all of these post so I just stuck this note here so I can find it later. Is there another way to do this?
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Old 03-04-2010, 09:13 AM   #27
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Let's take the fridge as an example. 1.5 amps at 120 volts.

If you run it on an inverter, it will use approximately 10 times as many amps, so that's 15 amps.

Fridges typically run about half the time, because the thermostat turns them on and off. So, in one day (24 hours), the fridge will run about 12 hours. 15 amps * 12 hours = 180 amp-hours. That makes for a big battery bank, which is why I'm suggesting that you do something different.

If we looked at the air conditioning, it draws 8 amps at 120 volts. If you ran it through an inverter, it would draw around 80 amps and 12 volts. If you decided to run it for six hours on a hot afternoon, you'd need 80 * 6 = 480 amp-hours of battery capacity just for that, which would completely discharge four brand new deep cycle batteries of the sizes typically used in Airstreams.
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Old 03-04-2010, 09:15 AM   #28
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I want to read all of these post so I just stuck this note here so I can find it later. Is there another way to do this?
"Thread Tools" menu item, scroll down and
"Subscribe To This Thread" (or 'add sub' whatever it says etc)
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