Hi all
I would value some guidance from those forumites that are familiar with battery technology
I have just had fitted to my 106 year old Dutch barge an electric bowthruster, 24 volt, 20 hp. Yes, we are all getting older!
After some help and guidance from Mr Tony Brooks of this parish the wiring and fusing is all in place, and the unit is up and running. It is a Duco unit for anyone interested, Dutch, good quality, but little by way of technical input for the installation.....luckily the boatyard new how to weld it in!
Anyway, in my design for the batteries, I took the view that semi tractions would be the way to go in order to give capacity for long bursts of thrust (this i is running the risk of turning into a Carry On script....) so I bought 4 Yuasa batteries of 6 volts and 225 amp hours, wired in series. They are the same ubnits as our old friends the Trojan T105 but are a bit cheaper.
Up and running and the thrust is good, but a bit weaker than I expected. Also noticeable is a distinct warming of the battery terminals after a 3 or 4 second burst. The current is between 500 and 600 amps based on the fusing suggested by both Duco and Tony B. Cables are not really warm, but batt terminal are.
I am now thinking that I made a bit of a boo-boo and should have used truck starter batteries with a CCA of c.1000 and capacity of c.180 A/hrs or so, wired in series to give 24 volts.
Would I be right in thinking that the semi tractions are not up to providing c.600 amps for such a purpose?
I can easily change, and use the Yuasa batts for another purpose in the domestic battery bankl, but before I spend again I would value thoughts.
Thanks for reading this far...................
Tim