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#### joamanya89

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Could someone explain me how do I calculate how fast is a charger going to charge my battery pack? I mean, I'll use some like a 375V pack with 100a/h (37500kw/h), and when I read the charger,(any kind), especifications I can't understand how to calculate o relate those especifications with my energy pack

Did I explain well my doubt?

And does anyone know a good online lithium batteryes seller, could you put here the web?, cos I'll have to import it, and it is not easy to find a good price just by the web.

#### rwaudio

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Could someone explain me how do I calculate how fast is a charger going to charge my battery pack? I mean, I'll use some like a 375V pack with 100a/h (37500kw/h), and when I read the charger,(any kind), especifications I can't understand how to calculate o relate those especifications with my energy pack

Did I explain well my doubt?

And does anyone know a good online lithium batteryes seller, could you put here the web?, cos I'll have to import it, and it is not easy to find a good price just by the web.
You can get a rough idea of the time by dividing the AH (in your case 100) by the chargers amp output. IE if it was a 20A charger it would take a little over 5 hours for a lithium pack. But also consider that 20A at a charging voltage for your pack is an 8kw charger.

#### joamanya89

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Okñ but I´m not caching how have you done to know that that is a 8Kw charger? I mean how do you calculate it... and hoy fast can I charge my batteries with out burn it? and can I conect a lot of chargers to make it faster?

#### TEV

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V* A=w

Your pack 375 V charging at 20 A : 375 V * 20 A = 7500 w = 7.5 Kw considering the charger efficiency you need a 8 Kw charger.

Now you have to consider the charger it's powered from grid hopely a 240 V in this case : 8000 w / 240 V = 34 A that means you need a charger able to take at least 34 A at 240 V from grid in order to charge your battery pack with 20 A. Also your charger have to be able to output more then 375 V.

If you use lithium battery , using multiple charges is not a practically ( or recommend ) option.

#### joamanya89

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Why is it not recomended? I have never heard about that...

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