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Thread: 480V, 3PH, UPS with 4 hours backup battery

  1. #11
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    Quote Originally Posted by Besoeker View Post
    And weighing close to 7 tonnes. And costing maybe about $25k
    One of our customers is a wind farm that has a grid-tied battery backup, 16 sea cans full of batteries on top of a mountain, 8,000kWh of storage. http://www.energystorageexchange.org/projects/164

    And yes, there are certainly cheaper options out there than batteries!

  2. #12
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    Based on my past projects, I could see this being a $300k custom system not including installation, shipping, engineering, drawing package etc.

    Total seems like $400k to $450k for a quick swag number.





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  3. #13
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    Quote Originally Posted by publicgood View Post
    $25k would be cheap. Thinking way more.
    I was basing it on what we paid for Yuasa VRLA units.
    Si hoc legere scis nimium eruditionis habes.

  4. #14
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    I wonder how Tesla Power Wall batteries would stack up to this application? I’ve not yet been involved in pricing them, but the concept is the same. I have a customer right now who has a solar farm backed up by them, he wants to run a 250HP drive and pump motor from it, I’m only involved in the drive part of it. It might be rude to ask him what the Tesla batteries cost him, but he also may not actually know because it was a packaged installed system with the solar panels, trackers, inverters and grid tie system. Rude of not, I’m going to ask him when I get a chance.
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  5. #15
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    Quote Originally Posted by Besoeker View Post
    I was basing it on what we paid for Yuasa VRLA units.
    Understood.

    Note: Due to the volume of electrolyte, by code, each battery cabinet would require thermal runaway management. That cost alone is about $10k, per cabinet.

  6. #16
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    Quote Originally Posted by publicgood View Post
    Understood.

    Note: Due to the volume of electrolyte, by code, each battery cabinet would require thermal runaway management. That cost alone is about $10k, per cabinet.
    Our systems were on open frame battery racks in an air conditioned switch room. Yes, that is also a cost factor.
    Si hoc legere scis nimium eruditionis habes.

  7. #17
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    Quote Originally Posted by Jraef View Post
    I wonder how Tesla Power Wall batteries would stack up to this application?
    Powerwall is $5,900 for 5 kW AC power and 13.5 kWh AC capacity. Currently in short supply.

    Tesla Powerpack might fit the bill. Specs are 50 kW AC power and 210 kWh AC capacity per unit. I'm unclear on cost, per wikipedia it was $400/kWh 1.5 years ago.

    Cheers, Wayne

  8. #18
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    each motor draws ~23 A
    you spec 2 items: inverter and batteries
    you need ~100 A x 4 hr ~ 400 A hr, use 500
    you need 1.35 x 480 or 650 vdc
    using a 24 v cell ~ 28 in series at 100 ahr each
    so 5 sets in parallel, 140 each 24 v 100 ahr batteries

    80 kw/100 kva inverter
    this is a common industrial ups
    inrush should be minimal during transition
    you can start the motors is sequence

    https://eaton-upssystems.com/?gclid=...SAAEgJlvfD_BwE
    The difference between genius and stupidity is that genius has its limits.

  9. #19
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    some pricing http://www.inverterpower.co.ke/index...va-unit-prices
    80 kw $60k 1/2 hr
    you need more batteries figure $70k plus install

    a 24 v 100 ahr battery $70 x 140 x 3.5/4 = $8600
    you get 0.5 hr with the ups
    Last edited by Ingenieur; 06-15-18 at 04:30 PM.
    The difference between genius and stupidity is that genius has its limits.

  10. #20
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    chicago, il, USA
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    Why not recommend to the customer a combination of both a genset and a UPS. The UPS would only be there for the transition from utility to generator power so it would not have to be sized for more than a couple of minutes of runtime but you would probably want to specify something in the 15-minute range. You could certainly use a UPS with less than a minute of capacity but I would think you would want it sized to handle a complete system shutdown in the event that the generator failed for some reason.

    With this design the UPS handles the transition while the genset spools up and then once the genset is online the ATS would transition from the UPS to the genset. Make sure you include in your calculations whatever controls equipment is required to operate these motors. This could involve one or more computer systems, a control cabinet, Etc.
    The world is round, you will get there no matter what path you take.

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