Battery power calculation from its capacity
Battery power calculation from its capacity
(OP)
Hi There,
In an article called 'An Energy Management System of a Fuel Cell/Battery Hybrid Boat', the author assumed values of charging, discharging, and optimum power of the battery as follows:
charging, discharging, and optimum power values for battery (Poptchar, Poptdis, and PBATopt ),
where charging power equals to discharging power with 30% capacity of battery and optimum power value is 20% capacity of the battery; the battery has 360 Ah and 560 V.
My question is, How the battery capacity will be converted to power ?
I know that Battery total energy = 360*560 Wh. So, i can calculate energy of 30% and 20% of it. But i need time to convert it to power.
If nominal current is 72 A. Then time for 30% of the capacity = 0.3*360/72 = 1.5 h and for 20% capacity is 1 hour. If I divide the energy of 30% capacity and 20% of the capacity over time of 1.5 hr and 1 hr, I have the same amount of power of 40320 W. What am i missing ? or it is a mistake of the article author ?
Many Thanks in advance
In an article called 'An Energy Management System of a Fuel Cell/Battery Hybrid Boat', the author assumed values of charging, discharging, and optimum power of the battery as follows:
charging, discharging, and optimum power values for battery (Poptchar, Poptdis, and PBATopt ),
where charging power equals to discharging power with 30% capacity of battery and optimum power value is 20% capacity of the battery; the battery has 360 Ah and 560 V.
My question is, How the battery capacity will be converted to power ?
I know that Battery total energy = 360*560 Wh. So, i can calculate energy of 30% and 20% of it. But i need time to convert it to power.
If nominal current is 72 A. Then time for 30% of the capacity = 0.3*360/72 = 1.5 h and for 20% capacity is 1 hour. If I divide the energy of 30% capacity and 20% of the capacity over time of 1.5 hr and 1 hr, I have the same amount of power of 40320 W. What am i missing ? or it is a mistake of the article author ?
Many Thanks in advance





RE: Battery power calculation from its capacity
RE: Battery power calculation from its capacity
Thank you for your kind reply.
How can I convert the capacity to power ??
If nominal current is 72 A. Then time for 30% of the capacity = 0.3*360/72 = 1.5 h and for 20% capacity is 1 hour. If I divide the energy of 30% capacity and 20% of the capacity over time of 1.5 hr and 1 hr, I have the same amount of power of 40320 W.
RE: Battery power calculation from its capacity
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RE: Battery power calculation from its capacity
Thank you for your kind reply.
I read this article so many times trying to understand but it is written exactly as follows:
'' charging power equals to discharging power with 30% capacity of battery and optimum power value is 20% capacity of the battery ''
You can find it in
http://www.mdpi.com/1996-1073/7/5/2799/htm
RE: Battery power calculation from its capacity
TTFN
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Need help writing a question or understanding a reply? forum1529: Translation Assistance for Engineers
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RE: Battery power calculation from its capacity
Thank you for your kind reply. I am agree with you that there is no sense in relating capacity to power and i am trying to contact with the author of this article.
Regarding Table 3, it is written that continuous current at 0.5C and life cycle is measured at 0.3C. What i should use ?
In Simulink, nominal current of such a battery should be 72 A.
What i am sure of is that 30% of the capacity equals to 108 Ah and 20% of the capacity is equals to 72 Ah. How can i calculate the power ?
RE: Battery power calculation from its capacity
Again, I think that 30% refers to 108A current and 20$ refers to 72A current. The power question was answered by the other poster already.
TTFN
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