Adding extra battery to bow thruster battery bank or replace single battery?

[KellysEye]

>Who says it's a caravan battery ?

That's odd when I looked it up it said it was a caravan battery, so I just looked it up again and it says it is a modern Calcium car battery.

 

[pvb]

Is the advice to use a starter battery (ies) for bow thruster rather than "service" or deep cycle battery?

Yes, the battery need to be able to supply a mighty current. AGM starter batteries are perhaps best suited.

 

[srah1953]

Yes, the battery need to be able to supply a mighty current. AGM starter batteries are perhaps best suited.

Thank you for this. Is there an issue mixing AGMS, say for thruster, with engine starter and house batteries being flooded all on the same charging circuit (electric charger and alternator)?
Thanks

 

[pvb]

Thank you for this. Is there an issue mixing AGMS, say for thruster, with engine starter and house batteries being flooded all on the same charging circuit (electric charger and alternator)?

Not really, most charger manufacturers specify a charge voltage about 0.1v lower for AGMs than for flooded batteries. If you charge AGMs at flooded battery voltages, I can't see there's going to be a major problem. If you can adjust the charger voltage, set it to AGM setting. If you have an alternator booster, do the same.

 

[Graham376]

Not really, most charger manufacturers specify a charge voltage about 0.1v lower for AGMs than for flooded batteries. If you charge AGMs at flooded battery voltages, I can't see there's going to be a major problem. If you can adjust the charger voltage, set it to AGM setting. If you have an alternator booster, do the same.

Quite likely there will be a 0.1v drop (or more) anyway with cable length to the bow, assuming that is where the battery is..