I tried to post a response but hit the wrong key.
Anyhow, you might want to contact the mfr. and see if they know of anyone in your area that they can reccomend for installation. After all you are "mixing" fuel
and electricity. You need a guy "who knows his stuff".
If your vessel is a planing hull
. you may see a substantial savings at cruising speed.
From what you mentioned I am assuming the other hull
is a displacement