Charging LV batteries form a higher Voltage PMA

[Usman]

I tried to google search the board with information on this subject but didn't come up with the required results.

We know that if we were to charge 48V DC batteries from a much higher Volt alternator (220VAC~rectified into DC),we would either use:

1-An AC Step-down transformer:

But the problem would be the conversion losses & start up difficulty because of the additonal iron in the tarnsformer.

2-The second way is to rewind the alternator for a lower voltage:

and that may not be practical for all the time, especially when higher wattge, say 5KW @ 48VDC, since the cable-dia. would get very thick & would be very expensive.

3-The third way is to hook the higher voltage generator to the LV battery-pack directly:

But then the charging would be ineffecient.

Just wanted to know if there is another more effecient way of accomplishing that.

I was wondering if there was a commercially available charge controller like MX60 for wind turbine applications (or Diesel/Gas generator) that would take a higher voltage and step it down to the battery voltage in the most effecient way.

Is there any such charge controller/ MPPT controller available on the market as such?

Thanks, Usman

[TomW]

usman;

I am starting to wonder if you sit around thinking up these questions?

Do you do anything RE at all yourself?

We already established that you do some kind of consulting but your questions are always so vague one can only assume you pull them out of thin air.

Time to fess up what you are really doing.

Time for full disclosure.

I am not the only one who feels you are abusing this forum by dumping these vague disjointed threads.

Tom

[Bruce S]

Usman;

   I like helping people as much as the next. BUT..... I went thorugh all your past posts and like TomW has said, you're asking questions that shjould've already had enough from previous answers to past posts.

In one you said you found the lister you were looking for. no pics yet?

I'm going to go with TomW on this one.

let's see some of the projects please.

Bruce S

Pssst If you had googled deeper and the entire web you would've found your answer:-/

[vawtman]

Hi Tom

 I agree an believe this is XX but he did say he would try to post a pic of the giant alt later this week.Maybe see if that comes onboard.

Mark

[Usman]

Hi Mark,

Will a picture of the giant (not so giant) alternator would get you satisified. If so, let me know and I would post more than a few pictures for your ultimate satisfaction.

Thanks.

[vawtman]

Let err rip(PICS) and the pole numbers and stator design.If you know that would be appreciated also.

Thanks Usaf

[Usman]

Hi Bruce,

"In one you said you found the lister you were looking for. no pics yet?"

You rushed into this criticizm, but never bothered to ask. I am positing a few pictures for you here. The Lister engine in a bullet proof-sound attenuated enclosure, with underground Fiberglass tank.

You said:Pssst If you had googled deeper and the entire web you would've found your answer:-/**Did you say entire-web?** I googled to some reasonable extend, but not certainly the entire web.

A few pictures for you too.

I hope this will satisfy your anxiety and contribute to my future postings.

Thanks.

[Usman]

Hi Tom,

I like criticism (on me) as that whats change someone. But here, I see something else between the lines¡Kthat also, doesn't bother me. You are welcomed to keep on criticizing further, as that¡¦s what you have been regularly up to from the start, to other member's posting as well¡Kbut again, that doesn't annoy me at all.

But what concerns me that precious time is being wasted here by converting a posting into a chatting session. You could simply neglect if you think my postings are scam! And in fact, that would be helpful to me & the board as well.

Your further questions:

"Do you do anything RE at all yourself"? That¡¦s for you to analyze by yourself, but GREEN ENERGY is main business.  

"We already established that you do some kind of consulting but your questions are always so vague one can only assume you pull them out of thin air". You are right, but you should ask, that¡¦s how you learn of other's opinion.

"Time to fess up what you are really doing". Here, you sound as if you are a criminal-investigatorfº

"Time for full disclosure". Is itf¼

"I am not the only one who feels you are abusing this forum by dumping these vague disjointed threads". I post comments, and try to contribute to those threads that I feel are within my capacity, other than that I did made it clear to all the board members & the administrator of the board that this is a commercial-oriented research project. I do not see that an 'abusing issue" here.

Thanks. Usman.

[Usman]

Sorry, but you will only get the pictures!

I am not intersted in discussing about that part of the project. However, if you need more input on that particular subject, post a questions, and you may get an input from me, if I feel I am capable to benefit the posting.

Thanks.

[vawtman]

Oh Goodness i did post ?s but the ?s don't benefit you.Why?

Sorry bout that.

[TomW]

Ok, so we can only comment the way it suits you?

Still no honesty, just crying we should help you make money and be happy you let us?

You need to think where you are, who is who and why this board exists.

It exists for people who do. Guys like vawtman, Bruce, Myself and others who post to this board. We give as well as take but we share what we do not just talk about it.

I have no beef with commercial entities seeking advice.

I do, however, have a beef with those who post un thought out, disjointed questions, say they will share results then just never do.

My point still stand.

The abuse is that you ask easy questions to answer but toss some twist into the mix. Like you are trolling the board for reactions.

This is my business, too, keeping the board rolling on track. The support in this particular thread for my point is proof you are annoying more than just me. I just happen to be more vocal about it.

Anyone can look at your post history.

29 story posts [about 2 a month] over here:

http://www.fieldlines.com/user/Usman/stories

68 comments [at this writing] over here:

http://www.fieldlines.com/user/Usman/comments

Thats the beauty of online forums. Who said what and when is all there for everyone to read if they care to know the facts of a situation.

OK, you win, Thats my last on this thread.

Tom

[TomW]

Just to be fair, my posting history is over here:

3041 comments.

http://www.fieldlines.com/user/TomW/comments

38 stories

http://www.fieldlines.com/user/TomW/stories

And I joined this board [came over from the original board] on:

2003-03-19 09:04:10

Just to be fair you can read my stuff if you have a couple weeks.

T

[electronbaby]

OOoohh i wanna see the pics too. :-)

(some of your recent questions or posts, could have been answered by reading some of my posts, if you took the time to google the board).

[elvin1949]

  Roy

 My opinion [and you know that ain't worth much ]

He sounds like he started a consulting business without knowing what he is doing.

 Letting us do his work for him. I've been wrong before,if so SORRY.Just the way i see it.

 later

Elvin

[Usman]

Thanks Tom,

"OK, you win, Thats my last on this thread. " I would be grateful if that offer may be extended to future threads.

"3041 comments" , at least 10 of those (a few on other as well) that I would label as "criticism", during my limited time & study with this board.

Remember "all that glitters, is not Gold".

& also " Quality is important, not the quantity".

Keep it up, and keep on contributing, in any way possible, as thats how you know that people are deeply concerned about you positings.

Will still post pictures,

Thanks, Usman.

[Usman]

Thanks Elvin,

"Letting us do his work for him", none of the guys posted on this thread have contributed ANYTHING in my previous posts, apart from unsucessful attempts to fail them up.

I havn't got a so call "Consulting business" but its just a part of what I am doing.

Keep on watching (not only) for pictures, and you would be soory that you bacame a part of this baseless scrutiny.

Thanks anyway,

Usman.

[Usman]

Hello Roy,

Great work, sorry for not spotting your posts earlier. I feel you have been 'blinking in the dark:('.

Keep on watching for pictures...soon, you will regret that you should have contirbuted rather than wast you time, as others here, in criticizing something that they don't know of.

Thanks, Usman.

[elvin1949]

Usman

 I said if i was wrong then "sorry"

Just the way it looked to me.

later

Elvin

[electronbaby]

uhh... cool down. I never criticized you. Just tried to help you out.

I have been "doing" for a long time, and like Tom and many others, I too have come over here from the old board back in 2003.

I dont care what kind of business you have. If you dont post pics, I just wont respond. This board is about sharing ideas. If your going to take them to make a profit and not give back to the community, then you will not get my respect.

[Bruce S]

Rush into this? are you nuts?

I actually took the time to read all your posts moslty filled with questions, hoping to help, then I googled your question the 1st 3 hits came up.

This I do to help people who answer with true answers, people who go right out and do their best to get the information, so we can be of help.

Anxiety? nope,

now I could careless what you do.

You shot back at everyone who posted on this and even fired back at one who was trying to help.

I'm done waisting time with you.

put up or buzz off.

BTW: Where's those pics?

 

[DamonHD]

I'm assuming that they must be absolutely amazing for him to tell TomW to ** off.

Very very few people that I've met (eg in business) who bluster that much have anything to show for it at the end of the day, however worthy their intentions for example.

As TomW might say "Just my observation and point of view."

Rgds

Damon