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shams-_-m said:hi every one , thanx alot for ur help ,
but i need a little inforamtion here ...
i have an acid battery charger , and i have 225 A / 12 V acid battery
i need to know , ( how can i know that the battery is full of charge ).
shams .........
thanx........
shams-_-m said:but i don' t have one
i have an multimeter , is there any way to use it .
jtexas said:"hybrid" probably refers to dual-use (cranking and deepcycle).
If you charge at 13.8v, the battery will probably not achieve 13.8v. (you might measure 13.8v or more immediately after charging, but lead-acid batteries have what is called "surface charge", which drops off quickly and isn't really available to your load.) I don't know if 2.5 amps is enough to reach a full charge, but 10 would suffice, or 8 or even 6....it just takes longer.
Once fully charged, a 13.8v float charge at a current equal to about 1% of the AH rating should be enough to keep it charged and ready to go. This is the best way to maintain your battery to get the longest life from it.
One thing to keep in mind during charging, it can be damaged if the electrolyte temp exceeds 125º F (51.5º C) for any length of time. If you hear it boiling, turn it off. Some gassing is normal.
note above I said a charging current of 10% of the AH rating....should have been 10% of the RC (reserve capacity) of a deepcycle battery, or up to 25% the AH rating of a cranking battery. sorry bout that.
ericgibbs said:hi ziyad,
Excom in SA loading shedding should only put you without power one day each fortnight, from 8am thru 5/6pm.
Unless you are in Cape Town or Jo'burg.?
The battery could be charged at a float charge of 13.8v, say 2 to 3Amps max, dont force a 15A fast charge, the battery life will be shortened.
Excom say, that the shedding should only last a couple of years, as you may already know SA has a 15% short fall in its power generation.
i am in Jo'burg, and we have power cuts every Monday, Wednesday, and Friday for 4 hours at a time.
They say a couple a years, but i think what they really mean is at least 7!
Please bring your candles and gas stoves along if you comming for the 2010 world cup.
ericgibbs said:hi ziyad,
With the 12v 25AHr battery, recharging at 2.5A is not going to be the problem.
eg: assume a fully discharged battery [down to 10.8V] 25Ahr/2.5A = 10hrs at 100% efficiency, it actually about 60%, so its recharge time would be around 18hours.
If your invertor is driving a 150W invertor at full load, assuming 100% eff, then its drawing 12.5A from the battery, actual eff% is more like 80% for an invertor so you are talking about 16Amps.!
So, 25AH/16 = 1.5 hours of operation from fully charged to discharged.
For at least 4 hours operation you need 16A * 4 hr = 64AHr.
Recharging at 2.5A, 64/2.5 = 25hrs at 100%, at 60%, gives abour 40 hours recharge time.
These are rough figures, but they should give you an insight into the problem..
Can you confirm the 'actual' current drawn by the water filter system and also more info on the invertor.?