Calculation for recharging time!

[paulwater]

Hello guys~

If I wana charging one 6V,10Ah Pb battery with 4.3w panel
Does recharging time calculation like below?

Battery capacity:6Vx10Ah=60watts
4.3w/60w=13.9 hr

Will use almost 14hrs to finish charging?

[albert436]

http://www.csgnetwork.com/batterychgcalc.html

Just googled the title of your thread, something about "efficiency loss" might need to be figured in. (?)

[Wy_White_Wolf]

Hello guys~

If I wana charging one 6V,10Ah Pb battery with 4.3w panel
Does recharging time calculation like below?

Battery capacity:6Vx10Ah=60watts
4.3w/60w=13.9 hr

Will use almost 14hrs to finish charging?

Correct format and units:

60Wh/4.3W = 13.9h

Actually you only want to run on the top 20 to 50% of the battery and also have to add in for losses.

50%:
60Wh / 4.3W * .5 * 1.5 = 10.5h

20%:
60Wh / 4.3W * .2 * 1.5 = 4.2h

So you recharge times should be between 4.2 and 10.5 hours or typically 1 to 2.5 days at 4 hours average insolation.

WWW

[Ibra]

Lorentz 3.0 software for pump sizing

Hi

Can any one send me the link or file for Lorentz software compass for sizing solar submersible pumps.


Regards
Ibra

[Sunking]

Well for one that 4.3 watt panel will not deliver 4.3 watts. YOu have two efficiency issues:

1. Is the losses of the wiring and charge controller you have to account for.
2. Battery charge efficiency. I assume this is a Flooded LEad Acid Battery? if so 80%

A good rule of thumb is:

H = AH / A / C

Where H = Hours
A = Amps
C = Efficiency correction fact less 1

So assuming this is a PWM controller using a 4.3 watt 6 volt panel A = .5 amps, and C = .8 for FLA then:

H = [10 AH / .5 A / .8 = 25 Hours

Assuming a 4 Sun Hour Day it will take a full week or 7 days to recharge from 0% SOC

[albert436]

Is 7 days quick enough for you PW?

[paulwater]

http://www.csgnetwork.com/batterychgcalc.html

Just googled the title of your thread, something about "efficiency loss" might need to be figured in. (?)

Thank you for the Link!
I'll try it!

[paulwater]

Correct format and units:

60Wh/4.3W = 13.9h

Actually you only want to run on the top 20 to 50% of the battery and also have to add in for losses.

50%:
60Wh / 4.3W * .5 * 1.5 = 10.5h

20%:
60Wh / 4.3W * .2 * 1.5 = 4.2h

So you recharge times should be between 4.2 and 10.5 hours or typically 1 to 2.5 days at 4 hours average insolation.

WWW

Hello Wolf
Thank you for the answer,and would you mind explain me a little more?haha
I don't understand "run on the top 20 to 50% of the battery" ,is mean use 20% and 50% panel efficiency to recharge battery?
And what is 1.5?

Thank you!

[paulwater]

Well for one that 4.3 watt panel will not deliver 4.3 watts. YOu have two efficiency issues:

1. Is the losses of the wiring and charge controller you have to account for.
2. Battery charge efficiency. I assume this is a Flooded LEad Acid Battery? if so 80%

A good rule of thumb is:

H = AH / A / C

Where H = Hours
A = Amps
C = Efficiency correction fact less 1

So assuming this is a PWM controller using a 4.3 watt 6 volt panel A = .5 amps, and C = .8 for FLA then:

H = [10 AH / .5 A / .8 = 25 Hours

Assuming a 4 Sun Hour Day it will take a full week or 7 days to recharge from 0% SOC

Hello Sunking
I will calculate with two issues,thank you!And you were right,that battery is lead acid battery!Take it from solar traffic light!
I'll show the pic later!

About your answer I almost got it,there few words I can't understand!
Efficiency correction fact less 1? Is means 1=100%?
What is FLA,SOC?

Thank you!

[paulwater]

Is 7 days quick enough for you PW?

It's ok!haha
Thanks!

[Wy_White_Wolf]

Hello Wolf
Thank you for the answer,and would you mind explain me a little more?haha
I don't understand "run on the top 20 to 50% of the battery" ,is mean use 20% and 50% panel efficiency to recharge battery?
And what is 1.5?

Thank you!

20 to 50% of your battery would be 12 to 30Wh. You don't want to use any more than that or you will damage the battery.

1.5 is to compensate for system losses. That is about what a PWM charge controller system would lose. Your system is too small for an MPPT controller.

WWW

[Sunking]

About your answer I almost got it,there few words I can't understand!
Efficiency correction fact less 1? Is means 1=100%?
What is FLA,SOC?

Thank you!

Efficiency Factor is 1 or less so yes 100% = 1
FLA = Flooded Lead Acid
SOC = State of Charge

[paulwater]

20 to 50% of your battery would be 12 to 30Wh. You don't want to use any more than that or you will damage the battery.

1.5 is to compensate for system losses. That is about what a PWM charge controller system would lose. Your system is too small for an MPPT controller.

WWW

Ok!
Thank you so much!haha
I will show the device later!

[paulwater]

Efficiency Factor is 1 or less so yes 100% = 1
FLA = Flooded Lead Acid
SOC = State of Charge

Thank you for explain me!

[paulwater]

Check the device!

This is solar traffic light from china!
company say can work for seven days in cloudy condition!

the solar panel specification
Pmax 4.3W
Voc 9.6V
Vmp 8.0V
Isc 0.59A
Imp 0.54A

Battery
6V,10Ah