| Author |
Message |
Chuck MC8 (207.69.169.132)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, October 15, 2002 - 2:41 pm: | |
My MC8 included two brand new,in the box military surplus, diesel fired heaters. They are similar to a kerosene blower heater. Burn diesel, of course, but also require 20 amps 24V dc to "crank-up", then 8 amps of 24V dc to run. I unboxed one today, finally figured out how to put it together, used jumper cables from a pair of 12v batts to power it. Works great,lotsa heat, but I'd rather use it in my shop than in my bus.
Question is, does anyone know of a transformer that I could just plug into the wall to provide the electricity? |
Bill Butler (172.147.44.145)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, October 15, 2002 - 2:54 pm: | |
Check with your local heating company. Residentual heat pumps use 24 volts. Thats where I got mine. |
OLMoldy (208.18.102.215)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, October 15, 2002 - 5:03 pm: | |
http://search.ebaymotors.com/search/search.dll?GetResult&query=battery+charger&from=R10&siteid=100&s_partnerid=2&currdisp=2&itemtimedisp=1&categorymap=6000&maxRecordsPerPage=30&category0=6000&combine=y&SortProperty=MetaEndSort&st=2&skip=30
JC Whitney, electrical suppy house , Camping World, quite common.
Larry |
Gary Stadler (Boogiethecat) (68.7.217.217)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, October 15, 2002 - 7:47 pm: | |
Um... transformers put out AC not DC. Domestic heating equipment uses AC mostly, so you probably won't find what you want there.
What would work most easily is a switching power supply, usually availiable from electronics surplus places for a song. 24 volts DC at 20 amps is close to 500 watts... a transformer based DC power supply will be fairly big and heavy while an equivalent switching power supply will be small and light. In any case you need something that puts out DC.
Without taking hours of searching internet surplus houses, I found this transformer-based one that "might" be big enough-
http://www.herbach.com/Merchant2/merchant.mv?Screen=PROD&Store_Code=HAR&Product_Code=TM01PWS4508&Category_Code=PWS
It's rated 24 volts out at 13.5 amps so it probably will work fine, and it's only 60 bucks. Although with some digging I think you could probably do better...
Here's some surplus places to look thru:
http://www.eskimo.com/~billb/supliers.html#surp1
(When you get there just scroll down a bit to the surplus houses)
Cheers
Gary |
OlMoldy (208.18.102.215)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, October 15, 2002 - 8:06 pm: | |
Thought he said 24 DC which is a convertor not Xformer, thats why I gave him that link I just bought one last week on that link. Just did not see the need for correction.
http://search.ebaymotors.com/search/search.dll?GetResult&query=battery+charger&from=R10&siteid=100&s_partnerid=2&currdisp=2&itemtimedisp=1&categorymap=6000&maxRecordsPerPage=30&category0=6000&combine=y&SortProperty=MetaEndSort&st=2&skip=30 |
Dale Fleener (66.52.86.62)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, October 15, 2002 - 8:11 pm: | |
Why not just use a converter? Plugs in and puts out DC voltage. Maybe a battery charger would work.
HTH
Dale |
OlMoldy (208.18.102.215)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, October 15, 2002 - 8:16 pm: | |
http://search.ebaymotors.com/search/search.dll?MfcISAPICommand=GetResult&query=battery+charger+converter&cgiurl=http%3A%2F%2Fcgi.ebay.com%2Febaymotors%2Fws%2F&maxRecordsPerPage=30&siteid=100&s_partnerid=2&from=R10&currdisp=2&itemtimedisp=1&st=2&SortProperty=MetaEndSort&s_partnerid=2&categorymap=6000&wty=0&sp=0&BasicSearch=&category0=6000
This is for converter same link, 120VAC to DC. |
OlMoldy (208.18.102.215)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, October 15, 2002 - 8:21 pm: | |
Link did not open.;
eBay Motors Save this search
1 item found for battery charger converter
Sort by items: ending first | newly listed | lowest priced | highest priced
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Item Title
Price
Bids
Time Left
MARINE POWER CONVERTER W/ BATTERY CHARGER
$25.00
-
3d 22h 01m |
Gary Stadler (Boogiethecat) (68.7.217.217)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, October 15, 2002 - 9:21 pm: | |
HERE"S THE ONE YOU WANT and if you bid it right (like at the end of the auction) you can have it for ten bucks!!
(or simply hit the "buy it now" button and get it for $45...)
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=1776977855
This is perfect for your needs...
Cheers
Gary Stadler |
Bill lidik (209.173.123.80)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, October 15, 2002 - 10:27 pm: | |
How about using a transformer and a rectifier. |
OLMoldy (208.18.102.167)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, October 15, 2002 - 10:44 pm: | |
Yea Gary that's it. Couldn't seem to get there from here. Great price, High Amps.
Larry |
Quest (198.29.191.148)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, October 15, 2002 - 10:46 pm: | |
fOR 24 amp or more with rectifiers, I thing the trasnsformer will cost more than the switching power supply would. ie: 24v transf with 12v center tap is about 20 bucks each. If he can pull that switching power supply for even 15 buckeroos, he has a deal. |
OlMoldy (208.18.102.167)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, October 15, 2002 - 11:10 pm: | |
Quest, I might be looking at something wrong, but a AC transformer will give you AC (AC in AC out). You could use a rectifier, converter or a power supply as was mentioned by Gary.
Oh well I'll let you young'ns work it out. |
Quest (198.29.191.147)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, October 16, 2002 - 12:26 am: | |
Yes, a transformer transforms ac of one amount (say 120vac) to a transfored amount (say 12vac). There are many ways to change that to DC, the trick is to clean it up so the equipment thinks its DC, ie: get rid of the ocillation wave of the natural ac current.
I like using a rectifier and capacitor to help clean it up. These are all abtainable from a electronic supply store, the transformer from a electronic surplus. BUT, if he can get the low bid on the power switcher, he is getting a heck of a deal, even cheaper than he can make one, which is still cheaper than buying one new.
Under control, ac is fun to play with (term used loosely) and is pretty easy to learn for our uses. Just have to make certain that our fix for what we need is done safely, we don't need any bus fires at all, do we?
But I don't recall the amperage he said he needed, I thought it was quite a large amount. The bigger the amount, the more expensive the transformer. then again, it will probably outlast whatever it is supplying power to. |
clottjr (207.69.2.37)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, October 16, 2002 - 6:39 am: | |
Thanks everyone for the info. I think the job on e-bay is just the ticket. I'll give that a try.
I thought I knew a "little bit" about electricity...turns out that I was right!
Thanks again! |
Ted Calvert (Chowbus) (192.132.225.130)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, October 17, 2002 - 5:31 pm: | |
Be Careful! A switching power supply, that is non-transformer, may well not provide isolation from the A.C. lines. Therefore, although you have 24 Volts D.C. across the power supply output terminals, they may be 120 volts above ground!
Ted. |
Gary Stadler (Boogiethecat) (68.7.217.217)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, October 17, 2002 - 6:09 pm: | |
NOT....!
Sorry Ted, I respectfully disagree.
The basic nature of a line-operated switching power supply is that primary and secondary ARE isolated from each other, and usually a lot more isolated than a regular 60hz transformer would be because of higher voltages found in the primary switching side. Switchers all have transformers that isolate line from output in them; they are smaller and lighter than 60hz stuff because they operate internally at very high frequency. In my 30+ years of electronic design and engineering I've NEVER seen a modular switcher, especially one made for telecommunications, that had any connection between the output and the power line- with exception of a few high powered dedicated "off-line" laser power supplies that are as unrelated to this one as the man in the moon.
BTW, the one in question sold for twenty bucks... did you win it Chuck?
Cheers
Gary Stadler |
Chuck MC8 (207.69.31.119)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, October 17, 2002 - 9:39 pm: | |
Of all things, With one minute left on the auction,
I was already "logged on" and had my bid ready..when I hit the "place bid" icon, My computer "connection was terminated". This has happened before, but not at such an inopportune
moment!
BTW: my bid was $16.51, so I would'nt have gotten it anyway. I e-mailed the guy to see if he has another. Thanks for the help. |
Scott Whitney (66.82.9.11)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, October 17, 2002 - 11:21 pm: | |
Bummer. Good excuse to get DSL or a cable modem and some good sniping software! (automatically bids at the last second)
Happy bidding,
Scott |
Gary Stadler (Boogiethecat) (68.7.217.217)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, October 17, 2002 - 11:37 pm: | |
Chuck, the ad said "these" instead of "this", and searching the seller's past sales he's sold 5 of them now, implying that he might have more. I'd simply write him and ask... I've found that many times you can make a deal and get one anyway!
Check it out::
http://cgi6.ebay.com/ws/eBayISAPI.dll?MfcISAPICommand=ViewListedItems&userid=used2b&include=0&since=30&sort=3&rows=25
Good luck..
Cheers
Gary |
Chuck MC8 (207.69.2.3)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, October 18, 2002 - 6:22 am: | |
I did contact the seller and purchased one for $40 including shipping. Using "off road" (not highway taxed) diesel fuel for these heaters should make economical heat. Thanks to all that responded. Chuck |