Industrial Battery charger Sizing

[adityalagudu3291]

We have 125VDC, 400 Amp-Hours Battery bank for our existing Battery charger. We are trying to upgrade our existing Battery charger.

Other than looking into our desired Input/output voltage and current, what are the standards for designing a Battery charger based on Battery bank capacity? Is there any Industry guidelines provided by IEEE etc? Please suggest.

 

[tom baker]

We don’t see references to IEEE standardsoften, I don’t recall any, so may not be able to assist with that. Who makes the charger you have now, have you looked to see what they may offer?

 

[petersonra]

We have 125VDC, 400 Amp-Hours Battery bank for our existing Battery charger. We are trying to upgrade our existing Battery charger.

Other than looking into our desired Input/output voltage and current, what are the standards for designing a Battery charger based on Battery bank capacity? Is there any Industry guidelines provided by IEEE etc? Please suggest.

I doubt there are any such standards. Is likely all a design decision

 

[topgone]

We have 125VDC, 400 Amp-Hours Battery bank for our existing Battery charger. We are trying to upgrade our existing Battery charger.

Other than looking into our desired Input/output voltage and current, what are the standards for designing a Battery charger based on Battery bank capacity? Is there any Industry guidelines provided by IEEE etc? Please suggest.

Look at IEEE Std 946-2004. IIRC, the sizing of the charger is based on the amount of amp-hours you are expecting the charger to deliver for a specified time period X 1.15 (the recharge inefficiency =1/efficiency of charger) plus the constant DC loads the battery/charger system is supplying power.
Hope that helps.

 

[adityalagudu3291]

We don’t see references to IEEE standardsoften, I don’t recall any, so may not be able to assist with that. Who makes the charger you have now, have you looked to see what they may offer?

The vendor recommends as attached for Charger sizing. I think it depends on the existing battery bank size.

 

[adityalagudu3291]

Look at IEEE Std 946-2004. IIRC, the sizing of the charger is based on the amount of amp-hours you are expecting the charger to deliver for a specified time period X 1.15 (the recharge inefficiency =1/efficiency of charger) plus the constant DC loads the battery/charger system is supplying power.
Hope that helps.

Thanks for referencing the IEEE standard, this is helpful. I think the general rule of thumbs suggests, the maximum charger output Amperage is 20% of Battery bank size.

 

[topgone]

Thanks for referencing the IEEE standard, this is helpful. I think the general rule of thumbs suggests, the maximum charger output Amperage is 20% of Battery bank size.

Please look at what you have posted prior to the above. The recharge current that the battery depends on the type of battery and capacity, the type of charger being used as well as the charging period determined for a full charge. Newer chargers have this built-in logic of limiting the charging current. The current that the battery sucks up from the charger is a function of the difference in the terminal voltages (charger versus battery) unless there is a limit provision. it's better to look at available charger current limits and base your capacity choice. Bluntly, you choose a smaller charger if you have the luxury of charging time but you have to bite the bigger chargers if you are constrained to achieving quicker recharge of your batteries plus battery manufacturers do not allow fast charging to extend battery life .