I recently completed a home brewed system using various parts from different manufacturers. I found the following to be some of the most challenging:
1) With a small battery bank you need to be aware of the discharge rates, some Lithium batteries are sometimes protected on discharge rates by the BMS. You may inadvertently limit the power available.
2) You can pickup a 48v power supply that runs on 120v online for relatively cheap, combined with a similarly sized generator gives you a nice backup for longer cruises. If you go with a large capacity charger this may not be necessary however as others have mentioned.
3) Consider your propeller and gearing mix, Thunderstruck sells an out of the box 2:1 which I'm sure works great but you need to make sure that the RPM range of the motor (based on voltage) is matched to your gear box and ultimately prop pitch. There is a great calculator in the files section of the group that helped me immensely here. Generally electric motors utilize much higher pitch propellers at slower speeds with great results. I changed from a 12x7 to a 13x13 on my Tartan-27 which isn't all that much different from your Alberg-30.
4) You can save some money by making your own motor mount and gear system, the gears and shafts can be had from mcmaster carr or something similar, mounts can be made from aluminum or custom at a local welding shop. Although this is not a simple design/build it isn't impossible if you are handy. Be sure to think about all of the forces involved, many folks forget about the thrust generated and how to transfer that to the boat instead of your transmission.
best of luck!
~Luke
Tartan 27 #478 On The Brink
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