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Howcome battery charger runs at 992W?

Flyback

Well-Known Member
Hi, This is the TB65 battery for DJI Matrice 350 RTK drone.

DJI Matrice 350RTK drone

TB65 battery:
It is 45V, 6Ah
(this seems an awful small battery for a 6.5kG drone?)

The charger (BS65) for it is this...

BS65 charger:
..This charger claims to be able to charge 2 x TB65 batteries and 1 x WB37 batteries simultaneously
(WB37 is just 8V X 5Ah)

WB37 battery:

The BS65 charge station says it runs at 992 from 230VAC.

But hang on....batteries should be charged at 1C and no more..therefore, the power draw from charging the 2xTB65 and 1XWB37 batteries should be no more than 580W, so howcome it is delivering 992W?
 
I think you are conflating different units and drawing erroneous conclusions. Show your work and maybe we can spot the problem. In particular power is not equal to voltage times ampere-hours.
 
I think you are conflating different units and drawing erroneous conclusions. Show your work and maybe we can spot the problem. In particular power is not equal to voltage times ampere-hours.
He seems to have multiplied nominal battery voltage by capacity (1C charging). Doing this would give you 580W max for instantaneous power: 6A * 45v * 2 (two TB65s) + 5A * 8v. It does seem correct to me. To get the max possible instantaneous power draw from the charger though you would also have to add 65W for the typc c port which would yield a max power draw of 645W.

The 992W rating is probably the theoretical max continuous output power of the charger and not the power it requires from mains at all times, but even then I don't see why it would need to be so high? Also when supplied with 100-120VAC instead of 220-240VAC the max stated output power drops to 750W which sounds more reasonable.
 

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