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Canal Marine Electrical Engineers
Canal Marine Electrical Engineers
2 min read · Updated 2026-03-20
Canal Marine Electrical Engineers
What this covers
Specialists in 12V and 24V DC, 230V AC and inverter/charger systems on inland-waterway boats. Work covers battery banks (lead-acid, AGM, gel and increasingly lithium iron phosphate), alternators and split-charge relays, solar arrays and MPPT controllers, inverters, shore-power inlets and galvanic isolators, consumer units, lighting, instrumentation and bonding/earthing.
What to look for
- Work to recognised marine electrical standards: BS EN ISO 13297 (AC systems on small craft) and BS EN ISO 10133 (extra-low-voltage DC systems on small craft). The BMEEA (British Marine Electrical and Electronic Association) sets a useful competence benchmark.
- For shore-power and 230V work: a recognised electrical qualification such as 18th Edition (BS 7671) plus marine experience, and willingness to issue an installation certificate.
- For lithium installations: explicit experience with the chemistry, a documented BMS strategy, alternator-protection arrangement, low-temperature charging cut-off, and a written installation specification.
- Galvanic isolator or isolating transformer specified for any boat with a permanent shore-power connection — without one, hull and engine corrosion accelerates dramatically.
- Tinned cable, marine-grade crimps and properly fused circuits at the source — terminal-block-and-mains-cable installs are a long-running source of fires.
- Red flags: domestic-spec consumer unit fitted, no RCD on shore-power, lithium cells installed without a BMS, no system schematic left with the boat.
Common questions
Lead-acid or lithium? Lithium gives about three times the usable capacity per kg, charges faster and lasts much longer, but costs several times more upfront and demands a properly designed installation. Lead-acid is fine for owners who are happy with the weight and the routine maintenance.
How big should the solar array be? A liveaboard typically wants 400–800W of solar to cover summer usage; less for weekenders. Roof space and panel angle are the limiting factors.
Do I need a galvanic isolator? If you connect to shore power for more than the occasional night, yes — it's the cheapest hull-protection investment on the boat.
Inverter — pure sine or modified sine? Pure sine for anything sensitive (laptops, washing machines, microwaves with electronic control). Modified sine works for kettles and lights but causes audible buzz on some appliances.
Can I do my own 12V wiring? Legally yes on your own boat. The BSS examines the installation regardless of who fitted it, so use marine-grade materials and proper fusing.
When you need this
Battery bank replacement (typically every 4–7 years for lead-acid, 10+ for lithium), inverter or solar upgrade, shore-power installation, fault diagnosis (flat batteries, charging problems, mystery drains), or as part of a new build / re-fit.