03-26-12, 08:32 PM | #11 | |
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Quote:
Batteries I figure are going to cost $400. to $700. +??? I'll need a 48volt contactor and a 1 or 2 meters. Everything else I have or can make. So I figure this conversion will cost $1000. to $1500. ??? |
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03-27-12, 06:58 AM | #12 |
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Yeah, I found a great deal on my motor on ebay. Just got lucky. It was used, but it was just bench spun. The brushes weren't even worn in yet.
I just run my contactor off one of my 12V batteries. It only pulls 1A and I have individual chargers for each battery so they all get topped off once plugged in. If you're interested, I have a couple extra laying around. I got a small bin of them from the local EV club.
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03-27-12, 07:34 AM | #13 |
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Thanks Daox.
I have some 24volt contactors and was thinking of using 2 of them. They are 4 terminal, 2 small terminals for the coil, and 2 large terminals for the load. I was going to wire the 2 coils in series so I go across 48volts, the whole pack. Wire the load terminals in parallel, so that only 1/2 the motor current goes through each contactor. Think it will work? |
03-27-12, 09:30 AM | #14 |
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That will work, but you need to be careful about how you wire up your power switch(s). You'll need individual circuits to power each of the contactor's coils otherwise you will run into problems.
So, you'll want something like this: Also, you won't be able to switch on both contactors at the exact same time. So, for however long that delay is, that first contactor is going to be transferring all the amps, and these are startup amps so it'll be pulling more than normal operation. It would be much simpler to just use one contactor. If you have individual chargers you don't have to worry about the batteries being unbalanced.
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03-27-12, 11:17 AM | #15 |
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That's the idea but just 1 switch. I don't know how to draw pic on the computer.
Batt+ 48volts to 1 coil A small terminal. other small terminal coil A to 1 small terminal coil B other small terminal coil B to Batt- If both coils the same voltage drop across them should be the same, 24volts. |
03-27-12, 11:26 AM | #16 |
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Yeah, that sounds like it should work fine.
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04-05-12, 09:21 AM | #17 | |
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Quote:
If you already have the second contactor and don't want to make a trip to the resistor store, using the second coil to drop the voltage is also fine, but there is no need to run the power through it's contacts... just wire up the two coils in series and run the motor power through one contactor and you're done (assuming it's rated for the motor current). Dang it... an electric mower wasn't even on my list of things to do until I read this thread! -Pete |
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04-19-12, 01:29 PM | #18 |
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Any updates on this project?
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04-19-12, 08:44 PM | #19 |
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Nothing really to report, I have a piece of 1/4" steel plate for the motor mount, just need to cut to fit and drill some holes in it. Also I have the steel for Battery racks.
The hold up right now is batteries, it's a toss up between a cheapy set from Wallmart or a good set of Trojans, 1275s. Oh and the $$$ for them. Lately I've being working on my gas ones, I have 5, I want to sell this yr. Going to just keep the really good ones that I need for myself. No Electric tractors will be sold, I like that stuff. |
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