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Old 05-25-2011, 10:24 PM   #1
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How much fresh H2O is enough?

I am in the process of laying out a new frame for a 31' AS and have the opportunity to increase the size of the fresh water tank.

What is a 'Wish list' size tank for H2O?

Thanks..
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Old 05-25-2011, 10:44 PM   #2
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It all depends on how you plan to camp. Do you drink the water? Do you cook with the water? Do you only use it for dishes and toilet and shower? Etc. I will say that we run out of fresh water before we have either holding tank filled. 'Course we have a Bambi with smaller capacities. Even so we can go a week with the black tank.
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Old 05-25-2011, 11:01 PM   #3
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I was thinking of going overkill on the fresh water because worst case I dont fill them all the way up but have the capacity if i did need it
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Old 05-25-2011, 11:15 PM   #4
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Our '83 27' Excella has 50 gal located between the axles. So far it has been adequate. We don't keep it full unless we are headed for a dry camping session.

Our 42' houseboat had 120 gal, but then, weight was no issue.
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Old 05-25-2011, 11:18 PM   #5
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My 2002 ASCL 31’ has 54 fresh, 37 grey and 39 black (grey + black = 76). I have found the 54 fresh is about right when dry camping since even with “equalizing” the grey into the black via their manifold when the grey gets full to allow for more space in the grey I generally run out of fresh about the time the grey is maxed out after “equalizing”. The black never usually gets full before the grey even after equalizing so I’ve got to dump about the time I’ve run out of fresh.
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Old 05-25-2011, 11:19 PM   #6
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It really depends on how you intend to camp. I have 30 gallons fresh and go through it in a long weekend of dry camping, while still having capacity in my 30-gallon gray and small original (13-gallon?) black. More of all of the above would be good, but most of all more fresh, maybe 45-50.
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Old 05-25-2011, 11:50 PM   #7
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Thanks everyone thats a big help!
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Old 05-26-2011, 06:11 AM   #8
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How do you "equalize" grey and black tanks?
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Old 05-26-2011, 06:29 AM   #9
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How do you "equalize" grey and black tanks?
I second the question. Do we have that capability built in to our 1999 Excella? I've tried to read all the literature and have not seen anything about that. Neat idea.
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Old 05-26-2011, 07:31 AM   #10
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How do you "equalize" grey and black tanks?
I think what the OP means is to place the cap on the drain outlet and then open both dump valves. The grey water will flow out of the grey tank and into the black tank. Before dumping both valves must be closed and before you remove the cap a bucket is used to catch the small amount of waste water that will be trapped between the dump valves and the drain outlet cap.
Trailers without grey tanks can do the same by capping the outlet and opening the black tank valve essentially turning the black tank into a grey tank as well.
The problem lies if the tank(s) are allowed to overfill, cross contaminated water can back up in to the shower pan. Yecch.
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Old 05-26-2011, 07:45 AM   #11
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The biggest problem with more fresh water is where to put it when you make is gray, or black. As has been mentioned above.

Always some gotcha, ain't there........
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Old 05-26-2011, 07:52 AM   #12
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I was thinking of going overkill on the fresh water because worst case I dont fill them all the way up but have the capacity if i did need it
You don't want to go too big.

If you always run with the tanks 1/2 full you will increase the probability of slosh induced sway.

Or get a tank with baffles. Or two smaller tanks.
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Old 05-26-2011, 08:14 AM   #13
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We have a 30 gallon fresh water tank, a 13 gallon black water tank and two gray tanks totaling about 22 gallons. We find this adequate for a three day boondocking weekend. We wouldn't want to hold any more wastewater for any longer because both start to stink after a couple of days in warm weather.

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Old 05-26-2011, 08:15 AM   #14
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30 gallons is enough for us.

We have a 12 gallon grey and a 12 gallon black tank. Along with a 30 gallon Fresh water tank. The grey tank is the one found to be a bit too small, especially if you use th shower. We carry seperate drinking water.
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