Calculation for recharging time!

[albert436]

Is 7 days quick enough for you PW?

[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

[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

[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

[albert436]

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

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

[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?