Battery power

Do-It-Yourself building projects and instructions

Moderators: russau, Leonard

Re: Battery power

Postby CalGoldDredger » Mon May 03, 2010 8:02 pm

Aww, ain't that cute. :lol:
CalGoldDredger
 
Posts: 784
Joined: Tue Jan 26, 2010 1:57 pm
Location: Hell, if I don't change my ways !!!!!

Re: Battery power

Postby au_miner » Mon May 03, 2010 9:43 pm

If you go on ebay and look under dredge there is an electric dredge listed, but it is in austraila :geek:
au_miner
 
Posts: 14
Joined: Wed Feb 24, 2010 8:40 pm
Location: Lakewood Colorado

Re: Battery power

Postby Hoser John » Tue May 04, 2010 5:37 am

:lol: And what are you going to be when ya grow lil'HBr??John-- a fella came into my biz with a tiny tinker toy dredge just about that size and gave it to us and we put it in our wet/dry processing area in the store and folks got a laugh outta it for quite a few years. Fun stuff-John
Hoser John
 
Posts: 3000
Joined: Wed Jan 27, 2010 6:42 am
Location: Redding Kalif

Re: Battery power

Postby JasonG » Tue May 11, 2010 8:31 am

Look at LiPo batteries, they are kinda all or nothing, they give you full juice until they are dead and then nothing so there is no decreasing power curve, I think they are just about the highest energy density battery you can buy right now too (read: lighter+smaller for equivalent energy). But, any lithium battery can be reactive (explosive) to water so probably not the safest thing to use for a dredge, although they are sealed and you could seal them again for more safety.

Electric motors are much higher torque than combustion type engines and similar or higher rpm, so you'd probably be good with a 1hp electric motor mated onto a standard centrifugal pump from keene or proline or wherever to get the required amount of pressure, might even be able to get away with using a 3/4 hp motor. You can buy them + speed controller for about $50-60 at electric bike stores, I got a 3/4hp one that is powerful enough to push me uphill at about 15mph and 25-30mph on the flats, I weigh almost 200lbs and the motor is pretty light and compact compared to a 2.5hp gasoline engine.

Anyways, it seems like a couple people a year talk about building an electric dredge but nothing much ever comes of it, I guess there is some limiting factor involved that makes them uneconomic.
JasonG
 
Posts: 26
Joined: Wed Feb 10, 2010 7:47 pm

Re: Battery power

Postby urbanminer » Thu May 13, 2010 11:22 am

I've been doing a little research and have a few questions. DC motor or AC motor with inverter? I'm also looking at submersible waterfall pumps. One looks real good with 11/2 inch discharge and 50 foot head. I think that would produce enough pressure for a 3", maybe 4"? Battery longevity seems to be the biggest hurdle. Without going bankrupt, about the best running times would be in the 1 to 11/2 hour range and run a solar panel to recharge between runs. I'm throwing this against the wall and we'll see what sticks.

Marc
User avatar
urbanminer
 
Posts: 119
Joined: Fri Jan 29, 2010 9:15 am
Location: Kingman, AZ

Re: Battery power

Postby Hoser John » Thu May 13, 2010 3:03 pm

PSI and GPM are the ruling factors-all else fails miserably in the requirements to run a dredge--John
Hoser John
 
Posts: 3000
Joined: Wed Jan 27, 2010 6:42 am
Location: Redding Kalif

Re: Battery power

Postby El Dorado » Sun May 16, 2010 4:11 pm

non-motorized means no motors and an electric pump is powered by a motor........ you would do much better with a gravity dredge........no motors, no batteries, no pumps. But it is still a fish killer in CA.
User avatar
El Dorado
 
Posts: 88
Joined: Wed Jan 27, 2010 8:51 am
Location: N. Cal Motherelode

Previous

Return to DIY

Who is online

Users browsing this forum: No registered users and 6 guests