Most of what a superyacht does happens with the engines off. The Sanlorenzo 58Steel is the rare boat in this class engineered around that fact — the first diesel-electric yacht in Sanlorenzo's steel line, built so that a night at anchor can pass without a generator running.
The propulsion argument
The system is built around twin E-Pods rated at 850 kW each, and Sanlorenzo attaches three specific figures to it: emissions reduced by around ten per cent, up to two hours of quiet cruising, and up to eight hours of zero-emission hotel mode at anchor.
The hotel-mode figure is the one that changes life aboard. Eight hours covers an evening and a night's sleep with the lights and the air conditioning running and the machinery silent. Anyone who has slept a deck above a running generator knows what that is worth — and Sanlorenzo has been specific enough about the claim that you can hold the yard to it.
Who it's for
Ten guests and thirteen crew, on 191 feet 1 inch and 1,165 gross tons. The crew outnumber the guests, which is what a properly staffed yacht of this class looks like, and a truthful signal of the operation you are taking on.
The buyer this suits has decided that how the boat feels at anchor matters more than how fast it crosses. The published maximum is 15 knots; the engineering spend went into silence and emissions rather than pace, and the whole appeal of the boat follows from that choice.
Not the 57Steel
The 58Steel will be quoted against the 57Steel constantly, and they are different boats. The 58Steel is nearly six feet longer, about a foot wider, and runs the diesel-electric E-Pods where the 57Steel ran twin CAT 3512C diesels. The two share a fuel capacity of 80,000 litres and very little else. Establish which model a document describes before you take a single figure off it.
Performance: what Sanlorenzo publishes
Twin E-Pods, 850 kW each, diesel-electric. Maximum speed 15 knots. Fuel 80,000 litres, or 21,134 US gallons. Gross tonnage 1,165. Length overall 58.25 metres: 191 feet 1 inch. Ten guests, thirteen crew.
On beam, Sanlorenzo's own page carries two figures — 11.25 metres in the specification block and 10.8 metres in the descriptive copy — so take the beam, along with draft and weights, from the build documents for the specific hull.
Ownership: the questions worth asking
Ask who commissions and services the diesel-electric system where you intend to keep the boat, and what the yard says about the battery and power-electronics lifecycle. A first-in-line propulsion system on a well-run boat is usually fine; those answers are what make it so.
Ask for the sea trial report with fuel burn at each rpm step — in electric and quiet modes as well as underway — and build your range arithmetic from the 80,000-litre tank with a proper reserve.
Ask how the eight-hour hotel-mode figure was established for your hull and load case. Air conditioning in a high-summer anchorage draws differently from a shoulder-season one, and you want the assumption behind the number.
Ask for the build specification: beam, draft, weights, tank arrangement and the electrical architecture that carries hotel mode.
Where to start
The 58Steel is the most technically interesting yacht Sanlorenzo currently builds, and the interest is practical rather than theoretical: it changes what a night on board sounds like. Judge it on the propulsion system, the commissioning support behind it, and the yard's own three figures.
Talk it through with Tony Smith — TS@MintedYachts.com or +1 (404) 805-9819 — or send the form on this page and we will come back with the yard's own documents.