letsgetem wrote: Good stuff, thanks. According to the motor specs (2018 90hp 4 stroke) - the alternator output is 50amps. THat appears a lot higher than the 2 stroke amps mentioned. One thing Im bothered by. THere doesnt appear to be a way of measuring the % charged of the battery. If there was, I would know whether the battery needs charging - and put the charger on it. Has anyone figured a way of measuring this?
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Kandrew wrote:
https://www.marine-deals.co.nz/smart-battery-chargers/ctek-comfort-indicator-eyelet-m8-8-4mm?gclid=EAIaIQobChMIpNvcrces8wIVgiQrCh2RBQDFEAQYASABEgJXePD_BwE |
letsgetem wrote: Oh damn I made another error - the 90hp motor charges at 35amps (not 50). The winch draws 83 amps. Anchor retrieval max rate is 41m/min. Anchor drop rate is 45m/min. (not free fall) I havent measured the exact time the winch operates - next time Im out I will keep a record of this. I have calculated roughly how much power should be used to drop and retrieve anchor - for my maximum anchoring, say 3 times at 25m depth (with twice the depth out). Its about 7.8AH. Charging at 35Amps, 7.8AH would take 17.8mins to recharge. I would always run for longer than 17.8 mins (at high speed) coming back in - so, theoretically, the battery should have always been fully charged when returned to the ramp. Whether the old battery failed because it was left not fully charged, or there was something wrong with it, I will never know. Interestingly, manufacturers warranty appears to be max 2 years ONLY! THats pathetic. But, maybe things dont always work according to plan. So, I will buy a Battery Comfort Indicator to ascertain when the battery needs charging; and a Ctek MXS 5.0 charger to charge it up fully. Can anyone comment on how this performs, or if any other battery charger would be better. THanks for all the points raised. |
letsgetem wrote: Oh damn I made another error - the 90hp motor charges at 35amps (not 50). The winch draws 83 amps. Anchor retrieval max rate is 41m/min. Anchor drop rate is 45m/min. (not free fall) I havent measured the exact time the winch operates - next time Im out I will keep a record of this. I have calculated roughly how much power should be used to drop and retrieve anchor - for my maximum anchoring, say 3 times at 25m depth (with twice the depth out). Its about 7.8AH. Charging at 35Amps, 7.8AH would take 17.8mins to recharge. I would always run for longer than 17.8 mins (at high speed) coming back in - so, theoretically, the battery should have always been fully charged when returned to the ramp. Whether the old battery failed because it was left not fully charged, or there was something wrong with it, I will never know. Interestingly, manufacturers warranty appears to be max 2 years ONLY! THats pathetic. But, maybe things dont always work according to plan. So, I will buy a Battery Comfort Indicator to ascertain when the battery needs charging; and a Ctek MXS 5.0 charger to charge it up fully. Can anyone comment on how this performs, or if any other battery charger would be better. THanks for all the points raised. |
Steps wrote: . I have a multistage
charger and always recharge the battery before a trip out. I also fitted
one of these battery level indicators to my battery as extra awareness
on battery charge. However I'm now having to
change my battery as although the indicator is still showing green, the
battery voltage has dropped to 11.6V and the battery won't hold a charge
as I think a cell has gone.
Chances are you may have , or have a voltage leak, maybe anything from salt/ dirt on the battery top between the terminals or in the isolation switch etc. A case of battery not being full charge when stored , and huge effect on battery life. Quick test if battery going down/ cell dropping, and dont have a load tester... Charge it up...leave 5 mins, note voltage. Then get an old incandescent car head lamp or something that pulls a lot current .. 12v pump, capstan/winch etc..run for 3 or 4 mins turn off wait couple minutes then check voltage... if good voltage will be same or very close to what was before loaded. |
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