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djkeev
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Joined: September 30, 2007
Posts: 32625
Location: Reading Pennsylvania
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chrisflstf
Samba Member
Joined: February 10, 2004
Posts: 3444
Location: San Diego
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 Posted: Sun Dec 10, 2017 7:26 pm Post subject: Re: 120v A/C to 72v DC |
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| Probably need more input power source info, DC motor specs, Application and what do you consider affordable? |
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busdaddy
Samba Member
Joined: February 12, 2004
Posts: 51146
Location: Surrey B.C. Canada, but thinking of Ukraine
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| Posted: Sun Dec 10, 2017 10:21 pm Post subject: Re: 120v A/C to 72v DC |
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2 forklift batteries (and thier chargers) connected in series.
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Wayne S. Johnson
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Joined: April 12, 2006
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Location: GILROY, CA
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djkeev
Samba Moderator
Joined: September 30, 2007
Posts: 32625
Location: Reading Pennsylvania
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| Posted: Mon Dec 11, 2017 6:59 am Post subject: Re: 120v A/C to 72v DC |
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Ok, what I'm thinking is this, and be kind, I'm not an electrical wizard!
I've an old GEM car, colf cart thing.
The third set of batteries has yet again perished and I'm not going to spend another $1,000 + for new ones.
Yes, I take care of them, check the water if flooded, bring them in during the off season but their life span is a,ways frighteningly short.
I've tried the expensive Gel Cell ones too.
In My antique 36v golf cart the batteries last forever, well...... 8 years.... 6 - 6volt flooded.
This has 6 - 12 volt units and they aren't near as durable as the old 6v units.
I have a pile of working generators. I'm thinking that if the generator could make enough energy to power the unit without batteries it would be great.
I fear that I'm day dreaming and have false hope here?
Dave
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Wayne S. Johnson
Samba Member
Joined: April 12, 2006
Posts: 1265
Location: GILROY, CA
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| Posted: Mon Dec 11, 2017 12:52 pm Post subject: Re: 120v A/C to 72v DC |
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| djkeev wrote: |
Ok, what I'm thinking is this, and be kind, I'm not an electrical wizard!
I've an old GEM car, colf cart thing.
The third set of batteries has yet again perished and I'm not going to spend another $1,000 + for new ones.
Yes, I take care of them, check the water if flooded, bring them in during the off season but their life span is a,ways frighteningly short.
I've tried the expensive Gel Cell ones too.
In My antique 36v golf cart the batteries last forever, well...... 8 years.... 6 - 6volt flooded.
This has 6 - 12 volt units and they aren't near as durable as the old 6v units.
I have a pile of working generators. I'm thinking that if the generator could make enough energy to power the unit without batteries it would be great.
Dave |
I fear that I'm day dreaming and have false hope here?
Nope, just follow my input.
A 12V gen will not get up to 70V.
All you need is an old golf cart battery charger and a $5.00 bridge rectifier.
https://www.jameco.com/z/MB358-Major-Brands-800-Volt-35-Amp-MB35-Bridge-Rectifier-Diode_178431.html
Get a charger with a wind up timer like this one. You could modify the charger is 1/2 hour.
https://www.ebay.com/itm/LESTER-MATIC-36V-25A-Elec...7675.l2557
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marklaken
Samba Member
Joined: March 19, 2004
Posts: 2416
Location: fort collins, CO
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| Posted: Wed Dec 13, 2017 11:33 am Post subject: Re: 120v A/C to 72v DC |
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Not to take the fun out of it and I'm not sure what the parameters are on your DC motor, but it could be cheaper and easier just to find a motor that meets your available 120 volt AC power supply. There are EV car chargers that output 72 Volts DC, but I don;t think they delvier many amps. http://www.cloudelectric.com/product-p/bc-f7210-110vac.htm
So are you trying to come up with an alternative system to power the gem car? If so and in regards to the Gem vrs old cart - are the charge discharge cycles equal on the two vehicles?
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