ABYC E-11 is the standard that governs AC and DC electrical systems on boats, including shore-power isolation transformers. The current edition is ABYC E-11-2025, AC and DC Electrical Systems on Boats. It revises E-11-2023. The August 2025 transformer updates take effect in August 2026. MarinePuck
A CL320 adaptor is the meter-head interface for a heavy-duty lever-bypass socket. The name is the jaw family, not the service amp rating. That is why utilities spec it on a 200 A PowerBack as well as on a 320 A can. Lever bypass is
The call came on a Friday. The yard needed a 50A marine isolation transformer. They already knew the rating. One 50A, 120/240V shore inlet. 12 kVA. Isolation, not a galvanic isolator. They did not know where to put it, and they did not want to
The boat came in on a 100A cord with a dead Charles Iso-Boost 100. That cabinet had done the job for years: 24 kVA, isolation, automatic boost when the marina sat on 208V. Charles Marine no longer builds it. The yard needed 24 kVA back,
Charles Marine’s Iso-Boost 50 is out of production. Yards still have them on 50A boats. When the unit fails, or when a new build would have spec’d one, the question is which isolation transformer replaces it. The MarinePuck that matches an Iso-Boost 50 is one
A Trident 20 kVA service saver is a modular temporary power restoration autotransformer. Each 10 kVA module weighs about 45 lb, sits in a hermetically sealed flame-rated ABS casing, and has its own 50A breaker. Two modules make 20 kVA for a 200A-class residential ticket.
A Trident temporary power restoration unit came back with 12,360 hours on the meter, passed routine service, and is going right back out. That is 515 days of connected time restoring 120/240V at the house while underground repairs waited.
A Charles 50A isolation transformer is the 12 kVA unit yards have installed for years. The common SKUs are the Charles IsoTransformer 93-IXFMR12I-A / 93-IXFMR12T-A and the Charles Iso-Boost 50. Both are 12 kVA, 50A, 120/240V class machines. Some boats show up with two Charles
A Restore-Lite 40kVA is the published 40kVA temporary restoration cart. SNC lists it as P80100: 40kVA, 120/240V, 200A breaker, 220 lb, floating-tap transformer, meter-head or pedestal cord set. The PowerBack 50kVA is the unit built for the same multi-home job at a higher current class:
Portable auto-transformers that instantly restore lost 120V or neutral power at the meter.
3-phase toroidal power towers for industrial, BESS, and datacenter voltage management.
ABYC-compliant, UL Listed Marine shore-power isolation in a corrosion-resistant puck design.
Medical-grade isolation with ultra-low leakage current — IEC 60601-1 / UL 60601-1 compliant.
Custom-designed, 30 VA – 70 kVA. UL, CSA, CE, IEC 60601-1 certified.
Custom inductors, filter chokes, and power inductors — amorphous core, air-core foil, de-buzzing.
GOSS toroidal, O-, C-, and E-cores — wound, heat treated, and epoxy coated.
Cuffed foil laminates for superior electrostatic and grounding shields in transformers.
Precision flat magnet and specialty wire built for thermal and mechanical reliability.
