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Question 
Generally in AC we consider voltage, frequency and phase 
sequence for parallel operation ... Can we parallel two DC 
battery chargers? If yes, then what precaution to be taken 
when we parallel two DC power?
 Question Submitted By :: Arun Naheru
I also faced this Question!!     Rank Answer Posted By  
 
  Re: Generally in AC we consider voltage, frequency and phase sequence for parallel operation ... Can we parallel two DC battery chargers? If yes, then what precaution to be taken when we parallel two DC power?
Answer
# 1		 
Before parallel operation of two DC Battery charger 
precaution to be taken is
1. Both Battery charger must to be same make.
2. Output of Battery charger output must to same volt.
3. Primary of both charger must to be connected in parallel 
with same phase sequence.
4. Output of Charger connected in parallel with same 
polarity.
5. Voltage regulation must be very perfect of charger.
 
Is This Answer Correct ?    4 Yes 5 No
Ramprasad
 
  Re: Generally in AC we consider voltage, frequency and phase sequence for parallel operation ... Can we parallel two DC battery chargers? If yes, then what precaution to be taken when we parallel two DC power?
Answer
# 2		 
1) Yes, theoretically, we can parallel two DC battery 
chargers, but generally they are not designed for parallel 
operation.

2) Following factors are to be considered.
   1) The voltage of both the chargers should be the same.
   2) Both chargers should be connected in the same 
polarity.
   3) The output impedance of both the chargers should be 
the same, so that both deliver equal current. (It is not 
necessary that both the chargers should be of the same 
make. It would rather prefer same model than same make.)
  4) The characteristics of both the chargers should be the 
same. Both should be set at the same current setting for 
changeover from boost to float.
   5) The current capacity of both the chargers should be 
the same.
 
Is This Answer Correct ?    6 Yes 0 No
Vijaykumar Shetye
 
 
 
  Re: Generally in AC we consider voltage, frequency and phase sequence for parallel operation ... Can we parallel two DC battery chargers? If yes, then what precaution to be taken when we parallel two DC power?
Answer
# 3		 
) The voltage of both the chargers should be the same.
   2) Both chargers should be connected in the same 
polarity.
   3) The output impedance of both the chargers should be 
the same, so that both deliver equal current. (It is not 
necessary that both the chargers should be of the same 
make. It would rather prefer same model than same make.)
  4) The characteristics of both the chargers should be the 
same. Both should be set at the same current setting for 
changeover from boost to float.
   5) The current capacity of both the chargers should be 
the same.
 
Is This Answer Correct ?    0 Yes 0 No
Omkar
 

 
 
 
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