Motors and Electricity
1. I will use twin Solomon Technologies ST74s (www.solomontechnologies.com
) as my motors see
Appendix 4. When sailing without using the motors the spinning props generate electricity to charge the
batteries. If you or Solomon Technologies recommends the new larger motors, equivalent to 80hp
diesels, for the boat I will go with them. Following are the various components I expect will be
purchased from Solomon Technologies:
a. ST74 2 Solomon ST74 motors, 2 Controllers, and Delrin shaft coupling.
b. MDB-TW 1 Main Distribution Box
c. SPMD 2 Safety Power Management & Distribution Panel
d. BBD-TW 1 Battery Breaker & Disconnects
e. MTS-RBR 2 Motor Mounts (set of 4)
f. E-Meter 1 Digital Readout
g. CA-01 Battery Cable Assembly
h. MN-CTRL-NS 2 Throttle controls - Mini Electronic with rubber boots.
i. LL4DL 12 Batteries (motor) - AGM Group 4D
j. LL31T 2 Batteries (House & genset) – AGM Group 31
k. DDH300V15 1 DC/DC Cross charger/Converter 144V to 12V 30 amp
l. AMMD 2 Digital Ammeter
m. Gen 15 1 HFL 15KW 144V DC Generator with breaker and muffler. If I ultimately go
with the new larger motors I will increase this to the 20KW unit and “house” power will
probably be 24V instead of 12V since that motor uses 240V instead of 144V. Either way I
believe a 200 gals diesel tank should be sufficient.
n. INV6 1 Inverter (true sine) 144V DC to 115V AC 6KW with breaker.
Glacier Bay has started a new division specializing in marine electrical equipment (see Appendix 2) and
is consulting with Solomon Technologies to make sure their equipment will be compatible. A 28KW
DC genset and an inverter are two of their first products on the market. I will want to determine if their
products should be used instead of HFL’s.
2. The following additional items not available from Solomon Technologies are needed to complete the
motor installation.
a. 2 Propellers. Alwoplast will need to consult with Solomon Technologies to select appropriate
props. Solomon usually recommends a minimum of 18” 3 blade props be used. Do you
recommend grass cutters be installed?
b. 2 Prop shafts
c. 2 Stuffing boxes
d. 2 #410 (or flex) prop shaft couplings
e. Ventilation system for battery storage area
f. Ventilation system for motor compartment
g. Main 12 volt power switch for house batteries
3. I expect clogged filters for raw seawater and diesel fuel will be one of the high maintenance concerns
on the boat. Therefore, I want easy access and systems designed for easy maintenance. See Appendix 5.
4. I want a very good lightning arrestor system. I expect this to be very important considering all the
electrical power and equipment that will be on board.
5. Shore power system not needed.
