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agni mohanty
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Join Date: Dec 2009
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Battery Charger Design

12/14/2009 4:11 AM

Can you plz help me in designing of a battery charger having 5500W load .How we can select the capacity of battery set for 5 hr. back up for the above load.
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PWSlack
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#1

Re: Battery charger

12/14/2009 4:42 AM

Is this a bettery charger, or is it really an uninterruptible power supply?

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agni mohanty
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#2
In reply to #1

Re: Battery charger

12/14/2009 5:13 AM

how is the procedure for calculation of battery charger & battery set for a load of 5000W with 1 hr back up.
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PWSlack
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#3
In reply to #2

Re: Battery charger

12/14/2009 5:15 AM

Start by stating the battery voltage. Divide the Watt-hour requirement by the battery voltage to get the required battery capacity in Amp-hours, then add a bit on to that figure to cover for battery ageing and deterioration.

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rasam.syamsudin
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#7
In reply to #3

Re: Battery charger

12/14/2009 10:36 AM

Dear All,

1). For designing battery charger please refer to other comments.

2). Sizing battery charger as described below:

Rectifier output current = battery charging current + Design load current.

Maximum loads =P = 5000W

Design margin + Spare capacity = 5000 W x 1.2 = 6000 W

Losses = 5% (assumption value)

Total watt = 1.05 x 6000 = 6300 W.

Vdc = unknown, assumed 220 VDC (rectifier output)

Minimum output voltage 220V – 10% = 198 VDC

Maximum output voltage 220V + 10% = 242 VDC

Minimum numbers of cell = (minimum output voltage/end voltage per cell).

= 198/1.8 = 110 cells.

Based on load profile, discharge current required for 1 hour =6300/(198 x 0.9) = = 35.35A, in which 0.9 is efficiency.

Based on Voltage rating and load current we have to select the AH battery. Let say 60 AH.

A. Charging current (I charge) should not exceed than 18% of AH battery, so the charging current is :

I charge = 18% x 60 = 10.8 A

Charging rating = I load + I charge = 35.35 A + 10.8 = 46.15A

Estimated battery charger rating is 220 x 46.15 = 10,153 W = 12.69kVA.

B. Other method using floating charger for 8 hours, so the charging current is : 60 AH/8H = 7.5 A

Charging rating = I load + I charge = 35.35 A + 7.5 = 42.85A

Estimated battery charger rating is 220 x 42.85 = 9,427 W = 11.78kVA.

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PWSlack
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#4
In reply to #2

Re: Battery charger

12/14/2009 5:22 AM

http://uk.ask.com/web?q=5500W+uninterruptible+power+supply&search=&qsrc=0&o=312&l=dir&siteid=

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V.I.Abraham
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#5

Re: Battery charger

12/14/2009 8:31 AM

The article in the link below gives a very good idea about designing of Battery chargers. All the technical basics are available. Start designing with locally available components. Once you sget stuck up on the way ask your doubts here again.

http://www.maxim-ic.com/appnotes.cfm/an_pk/680
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V.I.Abraham
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#6

Re: Battery charger

12/14/2009 8:48 AM

You may read the following link also. It will help to design.

http://cdn.vicorpower.com/documents/application_notes/an1_battery-charger.pdf
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Users who posted comments:

agni mohanty (1); PWSlack (3); rasam.syamsudin (1); V.I.Abraham (2)

Previous in Forum: Load Flow and Relay Coordination Studies   Next in Forum: NEC / IEC Voltage Ranges
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