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Daniele Fua wrote in news:J8VIg.85744$zy5.1465697
@twister1.libero.it: a "smart" regulator would fit. I understand that there should be a way to cheat the regulator and force a higher charge for at least some reasonable time. Anybody knows how? Don't! You cannot get a good charge on any lead-acid battery by heaving great gobs of current to it for 10 minutes. You get what's known as a "surface charge", a quick, but useless conversion on the surface of the plates that goes away, as you have obviously discovered, very quickly. Batteries must be charged SLOOOOOWWWLLLYYY to get a good charge, the slower the better. That 20A you're getting is the battery's chemistry resisting having its guts heaved out by the 14V applied...and is NORMAL AND DESIRABLE as it reduces charging time to something, while not ideal, at least a little more reasonable. A good charge happens at 10% of capacity...20A on a 200AH battery. The chemical reaction of our archaic lead-acid batteries just happens slowly recharging. Don't go screwing around trying to overhead and warp the plates on them in 10 minutes. Next time someone has a battery explode on their boat, wait 4 days then go look at what that looks like and you'll very quickly PUT THIS NOTION OUT OF YOUR MIND!...(C; However, just over the horizon of battery technology is just what all boaters are looking for....INSTANT CHARGING BATTERIES are HERE! Look at: http://www.physorg.com/news3539.html http://www.technewsworld.com/story/hardware/41889.html http://www.worldchanging.com/archives/002435.html "The excellent recharging characteristics of new battery are not its only performance advantages. The battery has a long life cycle, losing only 1% of capacity after 1,000 cycles of discharging and recharging, and can operate at very low temperatures. At minus 40 degrees centigrade, the battery can discharge 80% of its capacity, against 100% in an ambient temperature of 25 degree centigrade)." Even Yankees freeze solid at -40C! These Li-Ion batteries will be in hybrid and electric cars very soon. In a boat the DENSITY of the technology is going to be MOST welcome! The capacity of your huge battery bank will be reduced to the size of a loaf of bread with HUGE conductors attached to it so we can charge it at 400A or 4000A or more! THEN, your charger is going to be the issue....too small....little diesel. The entire output power of your Perkins 4-108 COULD, with this new battery, be converted to charging current...AND THE BATTERY WILL ABSORB IT AND CHARGE IN MINUTES, NOT HOURS. In vehicles, dynamic braking, which is currently too much power in too short a time to be of much use, will store most all the energy of braking right back into the battery bank to be used to boost you away from the traffic light, to the amazement of that little ******* with the noisy Honda who always goes shooting off ahead of you, now. Back to the calculator..... Let's say we're going to get 400AH of "house battery" in the new technology. 3 minutes, to fully charge it to 100%, is .05 hours. So, if we're going to charge a 400AH/12V nanoLithium in 3 minutes, we're gonna need: 400AH divided by .05 = 8000 AMPS for 3 minutes! Boy, that's gonna put a sweat on those v-belts...(c; 8000 AMPS! Hmm...746 watts = 1 hp, give or take a little. 8000A at 14V = 112,000 watts divided by 746 = 150 HP (plus any inefficiency of the charging system, of course.) We're gonna need a bigger ENGINE...not to mention alternator! When this technology emerges, I hope the boat business will have enough brains to switch to diesel-electric, traction motor drives. You'll have that 100KW electric power plant....well, maybe 50hp, 1/3 of that....and will be able to charge the new battery bank in 10 minutes at FULL POWER or switch the electrics to the traction motors for propulsion (and bow thruster??)....(c; -- There's amazing intelligence in the Universe. You can tell because none of them ever called Earth. |
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