Hi,
I've been reading through the group messages for a couple of weeks now since deciding to convert my wooden cruiser to Electric and was after some advice as there seems to be a wealth of information contained within the group.
The boat itself is 25' x 6'10", she has a V hull and sits about 2' in the water, currently she is powered by a 10hp BUKH diesel engine, but originally had an 8 hp Stuart Turner engine (petrol/gasoline)
From what I have read it would appear that the recommendation is an electric motor that has 50% the rating of the original, so I have been looking at a Mars ME0709 motor which appears to provide the required power output, looking at powering it the only real option appears to be to use 48v.
On that basis I'm trying to work out how much power I need in my battery bank and how I can recharge it in a reasonable time. I would ideally like to be able to cruise for two days on a full charge, assuming 5 hours of actual motoring time.
Looking at the performance data for the motor, if assume direct drive, as opposed to gearing down it would appear that the current draw across an hour would be:
RPM | RPM |
Bukh Output | Bukh Geared Down | Elec Current Draw @ 48v
============
2000 | 800 | 32
2400 | 960 | 38
3000 | 1200 | 48
I've used the Bukh output stats (RPM) so that the electric would be a direct replacement, is this a correct assumption? On that basis I'm assuming I would need around 380Ah of power, assuming that I'm not going to be running at full power on the UK canals, normal cruising speed is around 3-4 knots.
Would I be better going for a larger battery bank and using a reduction gear and if so what would be the advantages?
I'm planning on using a 2KVa silent generator on board to top the batteries up while I am out cruising, if I can put 50% back into the bank while out cruising then it would mean I would be able to have three full days of cruising without having to worry about being connected to shore power for a full recharge.
I've done a lot of car audio electrics using very high power amps etc so the actual wiring etc isn't concerning me, its just working out if the motor is the right one and what power I need in the battery bank.
I would also like to use a motor controller with a reversing function on it as I plan to remote control the boat when its in locks if I'm cruising alone, has anyone got any recommendations as to the best controller?
Thanks in advance.
- Paul
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