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Catch66
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Joined: 13/03/2010
Location: United States
Posts: 27

Posted: 04:31pm 04 Nov 2012

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hello all, I have been experimenting with various dc volt,for my F/P motor.
my system has 4 - 12 volt batteries which my solar panels dump and store.
The output with various volts was interesting.pulled 2 batteries out, hooked directly to turbine after rectifier. 24 volt noticed a good increase in amps. added a 3 rd and my turbine runs a lot smother.I've purchase a 72 volt dc reducer to 12 vdc (used for a generator system) plumbed it in
today added a 4th battery 48Volt yep nice. starts putting amps out @ 9 mph winds the reducer dumps at 12.5 vdc,I would like to step up volts on dump to 13.1 13.5.

Any suggestions.
would be a +.

thanks Chuck

Downwind

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Joined: 09/09/2009
Location: Australia
Posts: 2333

Posted: 05:07am 05 Nov 2012

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Im confused??? you quote 12 volt system then 72 volt alternator, and then 48 volt battery with 12 volts to it.

WHAT THE???

Im lost??

And why dump at 13.5v it seems a little low to me, but as i cant follow anything you are doing then that dont surprise me.

Sometimes it just works

Catch66
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Joined: 13/03/2010
Location: United States
Posts: 27

Posted: 04:57pm 05 Nov 2012

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Guru, Here is a link to the item I purchased.

http://www.ebay.com/itm/72V-12V-10A-120W-DC-DC-Voltage-Step- Down-Converter-Reducer-/150939396486?_trksid=p2047675.m1850& _trkparms=aid%3D222001%26algo%3DSIC.CURRENT%26ao%3D1%26asc%3 D11%26meid%3D3258822685854059625%26pid%3D100011%26prg%3D1005 %26rk%3D2%26sd%3D150916089007%26

The 48 volt battery's are small just being used for the resistance load. But the step down volts of 12.5 current is not flowing into my 12 volt system.
My thought was if a step up from the 12.5 to say 14 or higher would allow my main system to regulate.
Hope the water is a bit clearer after the post.

Thanks
ChuckEdited by Catch66 2012-11-07

Downwind

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Joined: 09/09/2009
Location: Australia
Posts: 2333

Posted: 05:57pm 05 Nov 2012

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I am not even going to try to workout the chinese puzzle of your battery system/solar/wind.

As for the stepdown DC to DC converter you have, its useless for charging a 12v battery (as you have found) and a 12v battery needs 13.8-14.2v to charge it effectivly.

Adding a stepup converter is not the answer, and just induces even more losses to the system.

You need to find a converter more suited to the power range needed (13.8-14.2v)i have seen some on ebay so you will need to look around.

The next problem you will have is the current rating of the converters, and require one with current limiting, or a flat battery will exceed the converter current rating and burn it out, unless you add some form of current limiting to the converter to restrict the current to the battery.

If you search around you should find converters that allow the output voltage to be adjusted and the current limit to be set, from memory the ones i have seen will handle up to 60v input with adjustable current/volts output.

Pete.

Edit....

Here is an example of a more suitable converter.

http://www.ebay.com.au/itm/New-DC-DC-60V-10A-600W-Constant-V oltage-Current-Regulated-Power-Supply-Module-/170892683491?p t=LH_DefaultDomain_0&hash=item27c9ff68e3 Edited by Downwind 2012-11-07

Sometimes it just works

Catch66
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Joined: 13/03/2010
Location: United States
Posts: 27

Posted: 01:24pm 06 Nov 2012

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Thanks Guru,
I appreciate your patients and also your solution.
Will check into your link.

Tx.again
Chuck

Downwind

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Joined: 09/09/2009
Location: Australia
Posts: 2333

Posted: 05:48am 07 Nov 2012

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The title "Guru" to me is not one of great pride or honour, so to address me as "Guru" is a small insult.

When i think of a Guru, i have a vision of a small Indian man with a turban on his head riding a magic carpet, sprouting words of wisdom.

Now my words might be somewhat of wisdom, i certainly dont wear a turban

(i do own a turbine

) and i have no magic carpet.

Pete.

Sometimes it just works

Catch66
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Joined: 13/03/2010
Location: United States
Posts: 27

Posted: 05:05pm 07 Nov 2012

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Pete, lol good one from this post forward you'll be called Pete.

as my Special Grandfather was named.

I've been searching for the step down convertor.
Tx Pete

Catch66
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Joined: 13/03/2010
Location: United States
Posts: 27

Posted: 04:31pm 11 Dec 2012

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Downwind,

I came across this unit tonight. has any one used this type of system
to control turbine over speed,or system voltage step down.
A dump load tied into immersion element in water heater.
The unit has 0 - 60 volt settable high and low to shut off.
Just take a look if you would Pete. the output could actually trigger a higher amp SSR if one needs more than 30.

http://www.solar-electric.com/volconswit.html

Downwind

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Joined: 09/09/2009
Location: Australia
Posts: 2333

Posted: 05:36pm 11 Dec 2012

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I had a look, and yes it would do as a battery monitor, although you would want to get the "Active High" version.

A little high in price for a cheap person like me though.

I would use a SSR with it, as the 30amp rating is a little light for the relay used, and a relay with contacts would arc pretty well at 30 amp.

Not sure what you mean by a speed control or voltage stepdown, but it would work as a dump load controller.

I think it said 10-60 volt not 0-60 volt, but that is still in the ball park.

Pete.

Sometimes it just works

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