These units are capable of converting input voltages of 18 to 35 VDC down to an output voltage of 10 to 15 VDC can convert an input voltage of 8 to 17 VDC up to an output  voltage of 20 to 30 VDC or can be used to regulate the output voltage

50 Watts x 4 + 200 Watts x 1 Continuous @ 4-Ohms

Spare Impeller

Hubbell HBL305CRC 30A Female ConnectorModel: HBL305CRC30 amp

Cobra Wire & Cable - Flat Boat Cable , 3-Wire Flat Marine Cable , 100’REELS , Part No. B7W63T-30-100, Gauge/Cond 6/3 Bussman These units are capable ofTinned copper conductors extra flexible Type 3 marine stranding, 105C PVC insulation, 50VDC, 600V AC. Flame retardant white PVC Jacket. UL listed standard 1426 Boat Cable 3 conductor: Color coded Black (hot), White (neutral), Green (ground) for AC Wiring applications