On our atlantic crossing
our the voltage regulator
on our alternator
failed on day 10, so a I followed instruction on Nigel Calder book on creating a emergency regulator
.This involved removing volage regulator and applying a set current
to the field wire. So the alternator
would create some output, after much tweaking it would output 30 amps for 10mins then drop to 20 amps for 10 mins then 10 amps for 10mins then drop to less than 5 amps after that regardless of battery
charge state. The voltage would climb to above 15Volts if you didnt watch it so there was the odd time the batteries
would have been getting around 15V for short periods.
This seems to have done strange things to our 3 sealed lead acid batteries
for the domestics(not suprising). We arrived in port replaced the alternator. Even after replacing alternator the battery
would not accept many amps (battery monitor
states around 25amps over charging
period before charge rate drops to 1 amp). Hmmm not good.
Next we charged with shore power
for 12 hours yet not all batteries read simular voltage. The readings were taken when the battery was disconnected.
bat 1 : 12.75v
bat 2 : 13.34v
bat 3 : 12.72v
Now all batteries are disconnected completely from each other to allow charge to 'soak in'. The boat maintenance
book told me this also
bat 1 : 12.61
bat 2 : 13.14 ???? IS THIS NORMAL ????
bat 3 : 12.59
Is seems strange one the batteries in 13.14 seven hours after been taken off charge.
Does any one know the damage bypassing alternators voltage regualtor would do to SLA batteries. The charge voltage was often at 14.6 to 14.8 volts.
Just to rest your mind at ease this 'bush mechanic' is not my usaul style yet the prospect of no autohelm
, fridge for remaining 12 days was not that exciting.
thanks in advance for your help!