On a meter, 120 + 120 = 240. In a marine electrical panel, it doesn't work that way. Two single-pole breakers can't safely protect a single 240-volt circuit. Only a common-trip double-pole breaker switches and trips both hot legs at the same time. Learn what ABYC E-11 requires, why breaker selection is a compliance issue for boatbuilders and OEMs, and how to spec a panel that passes inspection.

What is a marine electrical panel? It's the central hub of your vessel's power distribution. Every source on board, from battery banks to generators to shore power, feeds through it, and every load depends on it. Each circuit gets its own overcurrent protection. This guide breaks down how an ABYC E-11 compliant panel isolates AC and DC systems, sizes conductors and bus bars, and keeps a boat safe and serviceable for years. It's written for boat builders, engineers, and owners who won't leave power distribution to chance. Is your panel engineered right, or is it the most expensive mistake in the build?

Part 3 of the Paneltronics make-or-buy series shows what outsourcing looks like: a hybrid model where you define the requirements and a vertically integrated electrical panel manufacturer engineers and builds a finished, tested marine electrical panel your team installs plug-and-play. Learn how to evaluate an OEM panel builder (vertical integration, build to print and from concept, ABYC E-11 and industry fit, track record, custom labeling) and what to ask before you make or buy power distribution panels. For boat and specialty vehicle OEMs sourcing custom electrical panels, made in the USA.

Cost to build an electrical panel in-house, or buy it? Part 2 of the Paneltronics make-or-buy guide compares the cost to make vs. the cost to buy for electrical control panels and power distribution panels, then exposes the four costs the BOM never shows: the purchase order burden (APQC puts one PO at $50-$150), inventory carrying cost, non-recurring engineering and skilled labor, and warranty and liability exposure. Essential reading for boat builders and specialty vehicle OEMs deciding whether to keep building marine electrical panels in-house or buy from an electrical panel manufacturer.

Part 1 of the Paneltronics make-or-buy series opens the conversation every OEM manufacturer should have: keep building electrical control panels in-house, or buy them? A single backordered breaker can stop a boat or specialty vehicle line, and that risk traces back to one rarely questioned decision. We look at what has changed in the industry and why the math behind building marine electrical panels and power distribution panels in-house may no longer hold up, helping boat builders and specialty vehicle OEMs decide whether to build or partner with an electrical panel manufacturer.

Marine electrical systems don't fail all at once. They degrade over time. ABYC E-11 is the standard that governs how AC and DC electrical systems should be designed, protected, and grounded on marine vessels. This article breaks down the engineering principles behind conductor sizing, circuit protection, AC/DC segregation, and grounding, and explains why all of those decisions converge at the electrical power distribution panel. If you build boats, this is worth the read.