Home |
Search |
Today's Posts |
#21
posted to rec.boats.cruising
|
|||
|
|||
Boat battery question???
On Tue, 23 Jun 2009 12:12:42 -0400, Wayne.B
wrote: On Tue, 23 Jun 2009 15:58:11 +0000, Larry wrote: Mac? Don't you have 4 500A alternators in parallel so you can charge the house batteries in 5 minutes, like some boats I know?....(c;] We have a pair of 250 amp alternators. They won't charge the batteries in 5 minutes, but at half power they will drive a 2500 watt inverter at full output. http://www.alternatorparts.com/Extreme%20Duty%20Dual%20Rectifier%20CS-144%20type.htm Without a battery that would be in the region of 200 amps, not considering system loss. Cheers, Bruce (bruceinbangkokatgmaildotcom) |
#22
posted to rec.boats.cruising
|
|||
|
|||
Boat battery question???
On Wed, 24 Jun 2009 16:10:49 +0700, Bruce In Bangkok
wrote: Mac? Don't you have 4 500A alternators in parallel so you can charge the house batteries in 5 minutes, like some boats I know?....(c;] (It's not funny...I actually saw one like this!....with kids aboard going offshore!) How much voltage do you need to pump 2,000 amps into a battery? More to the point, how much battery do you need? I'd estimate about 40 pairs of golf cart batts at about 120 lbs per pair. Maybe the question is "how much boat do you need" ? |
#23
posted to rec.boats.cruising
|
|||
|
|||
Boat battery question???
On Wed, 24 Jun 2009 16:15:09 +0700, Bruce In Bangkok
wrote: We have a pair of 250 amp alternators. They won't charge the batteries in 5 minutes, but at half power they will drive a 2500 watt inverter at full output. http://www.alternatorparts.com/Extreme%20Duty%20Dual%20Rectifier%20CS-144%20type.htm Without a battery that would be in the region of 200 amps, not considering system loss. Yes, and there are losses, even with big cables and heavy duty lugs. |
#24
posted to rec.boats.cruising
|
|||
|
|||
Boat battery question???
"Bruce In Bangkok" wrote: How much voltage do you need to pump 2,000 amps into a battery? How muich time do you have? Lew |
#25
posted to rec.boats.cruising
|
|||
|
|||
Boat battery question???
Bruce In Bangkok wrote in
news How much voltage do you need to pump 2,000 amps into a battery? How dead is it? -- ----- Larry If a man goes way out into the woods all alone and says something, is it still wrong, even though no woman hears him? |
#26
posted to rec.boats.cruising
|
|||
|
|||
Boat battery question???
On Wed, 24 Jun 2009 18:43:20 GMT, "Lew Hodgett"
wrote: "Bruce In Bangkok" wrote: How much voltage do you need to pump 2,000 amps into a battery? How muich time do you have? Lew What? Amps have nothing to do with time. Cheers, Bruce (bruceinbangkokatgmaildotcom) |
#27
posted to rec.boats.cruising
|
|||
|
|||
Boat battery question???
On Wed, 24 Jun 2009 20:57:31 +0000, Larry wrote:
Bruce In Bangkok wrote in news How much voltage do you need to pump 2,000 amps into a battery? How dead is it? Dead enough to have to charge it :-) Cheers, Bruce (bruceinbangkokatgmaildotcom) |
#28
posted to rec.boats.cruising
|
|||
|
|||
Boat battery question???
Bruce In Bangkok wrote in
: Dead enough to have to charge it :-) 25% of AH rating tapering to zero after 12 hours.... Chemistry is slow.... -- ----- Larry If a man goes way out into the woods all alone and says something, is it still wrong, even though no woman hears him? |
#29
posted to rec.boats.cruising
|
|||
|
|||
Boat battery question???
Bruce In Bangkok wrote in
: What? Amps have nothing to do with time. Amps X Hours X charging efficiency as a decimal = AH Amps have a lot to do with time.... -- ----- Larry If a man goes way out into the woods all alone and says something, is it still wrong, even though no woman hears him? |
#30
posted to rec.boats.cruising
|
|||
|
|||
Boat battery question???
Bruce In Bangkok" wrote:
What? Amps have nothing to do with time. Ah but in the case of a battery, they do. How big is the batttery? Recharge rate won't exceed 15% average of the battery AH capacity. For every 100 AH taken out of a battery, you must replace 125AH. Wet cell batteries are not efficient, just convenient. As you can see the number of replacement AH put back in a battery is very much time dependant. Lew |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Battery Question | Electronics | |||
Battery question | General | |||
Boat Battery Question | General | |||
Boat Battery Question | Electronics |