AC Watt Hours VS DC Watt hrs

[MUHAMMAD FAIZAN]

I have Battery charger of 10 amp and i am charging 200Ah with DOD of 50%
means i have to charge 100AH,as per calculation Watt hrs=10*10*220=22KWh

and at the load side or battery side watt hrs=12*10*10=1.2 kWh

I am paying for more kwh to use less kwh,

Kindly guide me what is wrong here, what i am missing in my statements.

[sensij]

Watt hours = (Amps x Volts x Time) = (Power * Time) = (Amphours * Volts)

It doesn't really matter whether it is AC or DC, unless you are talking inductive or capacitive loads.

On the battery side, you have a 200 Ah battery discharged 50%, so 100 Ah * 12 V = 1200 Watt hours to replenish.

On the AC side, 1200 Watt hours / (10 A * 220 V) = 0.55 hours. So, it would take just over half an hour to recharge the battery (in the perfect world where battery charging was a lossless linear process).

Does this help?

[Naptown]

You have 2 problems
You are charging your battery at a C/20 rate. Should be at C/10
Also it takes depending on the battery about 120 amp hours to recharge that 100 you used.
Add in the losses of the charger and the watt hours goes even higher

[inetdog]

I have Battery charger of 10 amp and i am charging 200Ah with DOD of 50%
means i have to charge 100AH,as per calculation Watt hrs=10*10*220=22KWh

and at the load side or battery side watt hrs=12*10*10=1.2 kWh

I am paying for more kwh to use less kwh,

Kindly guide me what is wrong here, what i am missing in my statements.

In addition to the problems mentioned by others, your fundamental mistake is thinking that 100AH of AC yields only 100AH on the DC output side of the charger.
If the charger has 120V in and 12V out, then 10A in will produce 100A out. Therefore 10AH in will produce 100AH out (the hours of use on the input side are identical to the hours on the output side.)

Having to put 200AH of current into the battery to make up for using 100AH, on the other hand, indicates a much poorer than normal battery.

[MUHAMMAD FAIZAN]

Thanks

Thanks Inetdog, Sensij, Napetown for replies.

[MUHAMMAD FAIZAN]

Hi,
Hope to find you all in good health,

Dear all it would be kind if you can guide me that can we insert outback 3.5Kva inverter on two phases and 7.0KVa inverter on one phase to make three phase,
can we do this type of configuration,

[MUHAMMAD FAIZAN]

Sensij Please reply

[sensij]

Sensij Please reply

If you are relying on me, you might be in trouble.

With Outback equipment, you should be able to support a 3 phase system as you've described. There is no requirement that the inverters have the same power rating, but the load on each leg must be less than what that inverter can supply. You'll need a HUB and a MATE/MATE3 to make this work.

[MUHAMMAD FAIZAN]

AC Watt Hours VS DC Watt hrs

No dear,

I was just asking you as i am also in trouble,

Thanks for the guide,