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Hero999 said:I notice he's been unbanned.
Why the change of heart Nigel?
jtexas said:you probably know this, but I'll throw it in just in case - your wet-cell lead acid battery is only twelve volts, but it can throw a whole heck of a lot of current at you if short circuited.
I don't suppose it makes any difference. He will probably never return.
LOL!!!!ericgibbs said:Hi ziyad,
Your comment about candles for 2010 cup, reminded me about a joke I heard in SA.
1st Guy: what did they use for lighting in SA before they used candles..?
2nd Guy: electricity....
I'll do some sums, now that I know your requirement, get back to you.
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.?
Yip, i have considered that thanks, see above.jtexas said:If you can get your hands on another battery, identical to the first, in parallel will give you 2x the run time (more than 2x actually due to slower discharge rate), but at a cost of 2x the charging time. Unless you can scrounge up another charger. Or use 'em sequentially instead of simultaneously.
You might know the answer to a question I've been wondering about lately...if you used a water level sensor (the kind with bare leads) in a 20 gallon tank, would fish in the tank suffer any ill effects? I'm talking fish in excess of a pound or so, in fresh water.
Thanks!