http://www.electricmotorsport.com/store/ems_ev_parts_motors_pmac.php
This is a brushless DC motor, capable of 6hp continuous, 15hp peak. I’d like to run it at 48v to minimise the current requirements (and therefore cable gauge, controller cost). This means carrying a multiple of 4 x 12v batteries.
I guess we’ll need to fabricate something along the lines of this:
http://www.bellmann.nu/?nr=27
This incidentally, uses the far cheaper Lemco brushed motors.
the bellman UK agent seems to have a lot of good gear – I’ll be paying a visit to them at Southampton for sure.
http://www.mastervolt.com/marine/products/
The throttle component looks very fetching:
http://www.mastervolt.com/marine/products/accessoires/controlmaster-sport-td/
http://www.elecsolbatteries.com/products/Carbon-Agm-Deep-Cycle-Series/EL105F.html
These seem pretty good, with a 7 year guarantee, and if I carried 8 (£1200) with 4 under each bench in the saloon, that would be a shade under 200kg, and give 2 independent systems with a capacity of 840Ah (which at 30% discharge would run the motors at maximum continuous rating for 1.25hrs or 2.5hrs at 50% ).
If I went up to the 135Ah batteries:
http://www.elecsolbatteries.com/products/Carbon-Agm-Deep-Cycle-Series/EL135F.html
I would get 1080Ah with a total weight of 264kg for a cost of £1440. this would drive me at max engine rating for a little over 1.5hrs.
Elecsol claim that their batteries will still last a long time (>1000 cycles) even with 100% discharge, so the above is conservative estimates – not sure if the extra weight is worth the bother as electric is going to be used for getting in and out or we run the genset.
I could go cheaper with semi-traction leisure flooded cell batteries, however the life of the batteries would be limited, the discharge rate would be much lower than tha AGM batteries above, and the savings would not probably pay over time.