Link Vdc from Batteries to a VFD

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Hey freaks..

 

I need to create a link Vdc from 12V batteries to a VFD.

 

VFD output power = 10 kW
VFD input = 3xPhase 110Vca
Link Vdc = 312 Vdc
 

 

I think to use some low cost step up in series and parallel to get the Link Vdc. Some problem? Use a diode in each step up in series in the end of each series?

 

Or a step up converter direct to 312 Vdc? Some tip?

Or use a inverter 12Vca to 220Vca? This had check this, isn't cheap sad

Regards,

Bruno Muswieck

Last Edited: Fri. May 1, 2020 - 11:36 PM
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In concept it might be simple, the reality is you want 10kW of power - that is not so simple. For that you need 32A @ 312V = 10kW. To step up 12V to 312V, thats 26 times, so you need 832A at 12V. It might be easier to put 26 12V batteries in series then worry about how to charge them.

 

What ever method you use, it is not going to be cheap.

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I think to use some low cost step up in series

This is not some "toy" electronics or something to play around with...serious power and very serious hazards are involved.  Unless you are very familiar with all of this, you should consult with someone who is. 

300VDC, 10KW??? It is probably not worth turning yourself into burnt toast to save a few pennies.

When in the dark remember-the future looks brighter than ever.   I look forward to being able to predict the future!

Last Edited: Sat. May 2, 2020 - 03:36 AM
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brunomusw wrote:
VFD output power = 10 kW

Shall we read that as Variable Frequency Drive or Vacuum Fluorescent Display ?

 

brunomusw wrote:
low cost

I'd give up right there.

 

In any case; 10kW inverter might be achieved hacking a solar panel inverter but only by a supremo of a power electronics engineer. This isn't an Arduino level of project.

 

Or alternatively just buy a diesel generator.

 

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It might be easier to put 26 12V batteries in series then worry about how to charge them.

Yes, maybe the easier way is to make battery pack but not acid lead.

 

What ever method you use, it is not going to be cheap.  

Guys, stupid on my side.. sad

 

Shall we read that as Variable Frequency Drive or Vacuum Fluorescent Display ?

Variable Frequency Drive

 

This is not some "toy" electronics or something to play around with...serious power and very serious hazards are involved.  Unless you are very familiar with all of this, you should consult with someone who is. 

Don't worry, this isn't a toy. 

 

 

 

 

Regards,

Bruno Muswieck

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brunomusw wrote:
not acid lead

Why not ?

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The thought of taking that many batteries to produce 300VDC, scares the hell out of me, and I'm an electrician. Accidentally touching that = death, please wear appropriate PPE, if this is something you plan at undertaking!

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He was warned in #3 , but already seems unresponsive.  This is not some low power fly zapper! 10KW is to be respected, even at low voltage (ever short out a truck battery?).

 

When in the dark remember-the future looks brighter than ever.   I look forward to being able to predict the future!

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Why not ?

I'll check 7Ah or less to check size and weight.

 

The thought of taking that many batteries to produce 300VDC, scares the hell out of me, and I'm an electrician. Accidentally touching that = death, please wear appropriate PPE, if this is something you plan at undertaking!

Guys it's normal I handle with system from 10 to 250 kW in AC grid.

And for the record, I already did this using 27 lead-acid and 1 explode. frown

It's really danger... I'm not advice to anyone play with this kind of system.

 

 

Regards,

Bruno Muswieck

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And for the record, I already did this using 27 lead-acid and 1 explode. 

It's really danger... I'm not advice to anyone play with this kind of system.

Be sure to include a big fuse and fusible link!

When in the dark remember-the future looks brighter than ever.   I look forward to being able to predict the future!

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What fusible link would you suggest? A screwdriver or an adjustable wrench? Would that be fast blow vs slow blow??

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Top Tips:

  1. How to properly post source code - see: https://www.avrfreaks.net/comment... - also how to properly include images/pictures
  2. "Garbage" characters on a serial terminal are (almost?) invariably due to wrong baud rate - see: https://learn.sparkfun.com/tutorials/serial-communication
  3. Wrong baud rate is usually due to not running at the speed you thought; check by blinking a LED to see if you get the speed you expected
  4. Difference between a crystal, and a crystal oscillatorhttps://www.avrfreaks.net/comment...
  5. When your question is resolved, mark the solution: https://www.avrfreaks.net/comment...
  6. Beginner's "Getting Started" tips: https://www.avrfreaks.net/comment...
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Good guide...

I prefer 350 A, audiovisual alert. wink

Regards,

Bruno Muswieck

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Sadly, just an urban legend... https://darwinawards.com/legends...

 

Neil