Most Boats Have Their Inverters Installed WRONG! PYS Tech Talk
11 June 2026 · 6 min · 8K views
Closeup of inverter wiring and safety switch on boat.
What this video covers
Marine inverter installation errors covered by Jeff Cote of Pacific Yacht Systems include undersizing the inverter for concurrent AC loads, mismatching the inverter to the battery bank, and omitting a service disconnect — a safety device that isolates the inverter from the batteries during AC servicing.▶ 3:15 Most boats carry inverter-chargers, not pure inverters, and Cote notes that roughly 90% of installations fall into that category.▶ 1:20 Common wattage ranges run 2,000–3,000 W for most boats, with some reaching 5,000 W or higher; a 5,000 W inverter cannot run reliably on two golf cart batteries because voltage will drop below operating threshold.▶ 2:13 Wire gauge must match the inverter's amperage draw, and the fuse protects both the wire and the unit.▶ 3:58 A chassis ground — often skipped entirely — is essential for fault protection.▶ 4:16 The battery temperature sensor must be connected so the charger does not overcharge the bank.▶ 4:21 On the AC panel design side, Cote explains why inverter-fed circuits and shore-power charger circuits must be separated into a non-inverter bus and an inverter bus, with independent neutral buses for each.▶ 4:46 Running a battery charger off the inverter-fed panel creates a circular load that cannot sustain itself.▶ 4:46 Each neutral bus must be identified and kept separate when the panel is split.▶ 5:47
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