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Old 09-02-2014, 08:02 AM   #31
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Re: BUBB 1990 Thomas, 72 passenger

thanks for the reply bubb. the holy grail seems to be able to support A/C on solar. 3 hrs may be enough (if started after sundown) to cool the bus so one could sleep.
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Old 09-02-2014, 01:58 PM   #32
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Re: BUBB 1990 Thomas, 72 passenger

Have you looked at these DC split units? They seem really efficient.

http://www.geinnovations.net/HSAC_Productline.html

Quote:
Originally Posted by BUBB
The solar stuff has been working well, it powers my 5000 btu window AC unit in full sun,
My six 158 watt panels regularly put out about 50-55 amps as measured at the bus bar in full sun, around 25-40 amps in cloudy weather, the AC unit on full pulls 40 amps,

I need to move the inverter closer to the batteries, it was already installed on the other side of the bus with the smaller battery bank, it looks like the 6ft long 2/0 cables which attach the bus bar to the inverter are too long and I am loosing too much voltage, the bus bar voltage will show 12.5amps while the inverter is showing 11 to 12 volts depending upon the amps being provided by the charge controller,

I had once incident of the mppt giving me an overheating error message and it started to dump most of the power, in the bright sun it should have been giving over 50 amps but was only providing about 10, I put a small Dc powered fan near the mppt and it cooled it off quickly, I could only touch the heatsink for a second when it was overheating, withing 2 minutes it was much cooler, probably down to 90 degrees or so and its power output went up to max again, the overheating happened when the I had just opened up the bus and it was probably still 120 degrees inside the bus,


I have ordered a small 12v temperature controlled switch so I can attach it to the mppt heatsink and the fan, it can then turn the fan on and off as needed.
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Old 09-02-2014, 03:01 PM   #33
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Re: BUBB 1990 Thomas, 72 passenger

I have a dozen hours of searching for dc units because they are at least 20% more efficient depending upon the particular unit, the problem is their prices start at about $2000,
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Old 11-03-2014, 04:19 PM   #34
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adding a second diesel fuel tank

I am adding a second fuel tank, will have pictures tomorrow,
Comments and suggestions are welcome,
It is a 75 gallon tank, is 13in tall, 20in wide, 66in long,
I will hang it on the drivers side frame, the main tank is on the passenger side, I wanted to spread the weight around.
I will bolt a total of 4 vertical supports to the frame,
The main tank is about the same size, it has 3 L-shaped supports, the 12 bolts holding this other tank onto the frame are good for about 27tons so I am doing the same for the auxiliary tank.
The two end vertical supports will be 3in angle, I will then add a 22in long vertical support of 2in angle for the tank to sit on, I will then add a 45 degree piece of angle so the shelf holds up the weight,
Between the two end vertical supports will be two 2in angle vertical supports but these will be on the inside of the frame opposite of the tank, I will still add a 2in angle horizontal support to the bottom of these supports to support the tank but then I will put a 3in metal strap over the tank to attach/tighten the tank, the 3in strap is 3/16th thick and will have two 3/8th inch grade 8 bolts on each end of the strap.
I then plan on adding another piece of 2in angle to the end of all the horizontal shelf pieces to keep then from swaying,
It will be an auxiliary tank that needs an external pump to put fuel into the main tank, at least for now.
I added a few pieces of 1x5 boards between the tank and frame to keep it away from the bolts, I added a few pieces of 2x4's above the tank to fill the void that will occur when it is mounted.
So far I have almost completed bolting the 4 verticals to the bus frame.
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Old 11-04-2014, 06:34 PM   #35
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Re: BUBB 1990 Thomas, 72 passenger

I attached a picture of the beginnings of the fuel tank mount,
You can see at the far end of the picture the 3in angle piece bolted in place,
You can see the 3 red pieces of wood that will act as bumpers to keep the tank from grinding on all the bolts sticking out of of the frame,
Between the red pieces and on the inside of the frame you can see two brown pieces of 2in angle,
You can see black marks drawn on the angle beams, these are how far down the tank will hang,
All these vertical frame pieces will have a horizontal piece bolted to the bottom to act as a shelf to set the tank in,
At the top of the picture you can also see the two brown 2x4's I bolted to the "floor" of the bus to fill the void that will be above the tank.
Attached Images
File Type: jpg fuel tank mount.JPG (107.1 KB, 128 views)
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Old 12-16-2014, 04:08 PM   #36
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Re: BUBB 1990 Thomas, 72 passenger

added extra fuel tank, ~70 gallons,
Attached Images
File Type: jpg tank below.JPG (279.9 KB, 71 views)
File Type: jpg tank chains.JPG (305.2 KB, 64 views)
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Old 12-20-2014, 11:03 AM   #37
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I don't know what happened for sure but the email and password on this acct got changed, this thread is dead, if anyone posts as "bubb" it is not me, my new thead will be "bubb, the real one".
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Old 12-20-2014, 07:58 PM   #38
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Quote:
Originally Posted by bubb, the real one View Post
I don't know what happened for sure but the email and password on this acct got changed, this thread is dead, if anyone posts as "bubb" it is not me, my new thead will be "bubb, the real one".
I know the feeling, I had to do the same, just made my new acct. with the standard military modification......
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Old 12-22-2014, 09:10 AM   #39
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tank mount from inside of frame

I have already posted pictures of each end of the fuel tank mount, the tank is held on with 4 vertical pieces bolted to the frame, this is one of the two verticals that are bolted to the inside of the frame, 2in square tube at 11ga, it has 2 bolts that are 3/8in and 4 bolts that are 1/4in connecting it to the frame, and two 3/8 bolts connecting the horizontal to the vertical piece, all are grade 8 bolts.
Each of the 4 verticals have over 10 tons of bolt strength, which is similar to my calculations for how much bolt strength is on the original fuel tanks 3 hangers,
You can see 2 chains in this picture, the top chain has a 1/2in bolt holding it to the frame, it is the one that goes over the tank to the other end of the horizontal piece, the lower chain connects the frame to the vertical piece so the vertical piece can not slide down the frame piece.
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File Type: jpg tank from inside of frame.JPG (235.6 KB, 14 views)
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Old 09-26-2017, 10:19 PM   #40
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Quote:
Originally Posted by BUBB View Post
5000 btu AC unit with 7in diameter vent installed,


Where did you get your clear lights that replaced the flashers?


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