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Help, I just completed a conversion but have a problem

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#1 rgbarney OFFLINE  

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Posted June 26, 2016 - 07:46 PM

I just completed a conversion on a Craftsman LT2000. Yesterday I took it our to mow my lot of pretty thick and tall grass and it was cutting great, for the first 150 feet. Then the power declined dramatically and I limped back to the garage. I don't think my batteries were depleted that quickly (12V 35AH Sealed Lead Ac), but I'm planning to upgrade the pack so I can run longer.

 

While I was checking belts on the deck I put it back on the charger and 60 minutes later it did the exact same thing.

 

Any thoughts? Is it as simple as too little battery capacity?

 

Thanks,

Randy

 

 



#2 chieffan ONLINE  

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Posted June 26, 2016 - 08:36 PM

35 AH is not much for a battery.  I run at least 350 CCA (Cold Cranking Amp) in mine and the diesel run a 450 CCA.



#3 boyscout862 ONLINE  

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Posted June 26, 2016 - 08:45 PM

Welcome to GTT. Please explain your conversion. Good Luck, Rick



#4 diesel nut ONLINE  

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Posted June 26, 2016 - 08:47 PM

Did you convert it to full electric or re-power it with a different gas engine?  If it was to electric then you probably don't have enough batteries in it to run very long.  I think most of the electric tractors had 4 to 6 batteries in them.  I know the Wheel Horse Elec-Trac I have takes 6 6 volt batteries and I believe they're wired in series to get higher voltage to run the tractor and whatever attachment was put on it.           Stewart



#5 rgbarney OFFLINE  

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Posted June 26, 2016 - 09:43 PM

I should have specified I do have 4 12V 35AH batteries, giving me 48V.

 

I'll post some pictures and describe the conversion later this week.

 

Randy


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#6 toppop52 ONLINE  

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Posted June 27, 2016 - 10:34 AM

Not near enough capacity for that, you run out of current in a hurry, as you found out. 4 800-1000cca deep cycles would be the ticket. I meant 6, not 4.


Edited by toppop52, June 27, 2016 - 10:34 AM.


#7 Titus OFFLINE  

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Posted June 28, 2016 - 07:08 AM

Looking forward to seeing some photos on this. But I agree with others, your amp hours are far too low. 



#8 Billy M OFFLINE  

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Posted June 28, 2016 - 08:09 AM

"We just canna' dooo it captain...we dooon't have the power!"...says Scotty...and your batteries!  :D


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#9 rgbarney OFFLINE  

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Posted July 24, 2016 - 06:24 PM

I converted a Craftsman LT2000 to 48V. 

 

I used a Motenergy ME1004 PMDC Motor (24-48V, 10.75 hp cont, 21 hp pk) and a MZJ-400 Main Contactor. I have four new 12V batteries I need to install so I'll be able to mow for more than 15-20 minutes.

 

I have tried to post/link to three photos.

 

 

Attached Thumbnails

  • Dash.JPG
  • Motor and Batteries 1.JPG
  • Motor and Batteries 2.JPG

Edited by rgbarney, July 24, 2016 - 06:25 PM.

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#10 DH1 ONLINE  

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Posted August 21, 2016 - 11:25 AM

Just saw this thread now, the motor your using has 200 amp continuous rating and can draw up to 400 amps.

With the batteries you have your looking at minutes for cutting time, most guys that use that motor for a conversion like you did are drawing 100amps + from the batteries when cutting grass.

With a set of big 12volt batteries Trojan 1275s  you will get about 1hr cutting time +/-


Edited by DH1, August 21, 2016 - 11:30 AM.

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#11 crittersf1 OFFLINE  

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Posted August 27, 2016 - 03:13 PM

:welcometogttalk:



#12 Little Eddie OFFLINE  

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Posted March 25, 2017 - 12:27 PM

Hi Randy

            Great to see other people are trying electric,

Yes one of your problems is the batteries and also the voltage would be better if it was 24v or even 48v as your motor will be drawing high amperage, measure the current when cutting? it will probably be over 100-200 amps @12v? you could put several larger batteries in parallel but with only 12v and high current you will waste power in the wiring system, you can reduce this by increasing the battery voltage, this means changing your motor though,but you will still not be very happy with the runtime because of the inefficient belt drive system!

When running with limited battery power it is very important to make the design as efficient as possible, this applies to almost all battery devices,

I would suggest you:-

1, eliminate all the belts,

2, use 3 smaller motors instead of one large motor, 1 for drive and 2 direct drive for cutters

3, use electronic speed control for the drive motor,

4, increase battery voltage,

5, increase battery capacity,

6, use deep cycle flooded lead acid type batteries,

there is a video on how to on my website electrictractor.net if you want more info and tips,

Hope this helps, Little Eddie

 

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