I didn’t expect it to come from a conversation about bilge pumps.
A friend of mine has been sailing since his early twenties, mostly coastal routes, a few longer crossings. We were talking about water management one afternoon and I mentioned something about the 5-gallon jugs most van lifers use. He looked at me with genuine curiosity. “You’re treating water like it’s free,” he said. “Sailors stopped doing that about a hundred years ago.”
That conversation has stayed with me. The more I’ve thought about it, and the more time I’ve spent around both communities, the more I’ve realised that sailors solved most of van life’s practical problems before van life existed as a thing. The systems, the psychology, the discipline around resources. It was already worked out, on boats, in some cases decades before anyone spray-painted a Transit white and called it home.
This isn’t a metaphor. These are direct, functional lessons that translate across almost directly.
1. Water Is Not Unlimited, and Sailors Figured That Out First
A mid-size cruising sailboat preparing for a transatlantic passage typically carries between 40 and 100 gallons of fresh water. The crew calculates exactly how many litres per person per day they need for drinking, cooking, and basic hygiene. Then they add 15 to 20 percent for emergencies. Everything is metered. A foot-pump at the galley sink, rather than a pressure tap, forces whoever is washing up to think consciously about each pump. It sounds tedious. It becomes instinctive.
Van lifers, on the other hand, start with a 5-gallon jug and wonder why they’re refilling it every two days in the desert.
The approach many new van dwellers take is to buy a water container, fill it up before they leave, and figure out refills as they go. No calculation, no daily target, no thought about what happens if the next town is further than expected. Sailors would find this alarming. A sailor crossing from Portugal to the Azores doesn’t “figure it out as they go.” They know exactly how many days of water they’re carrying, and they manage to it.
The practical lesson here is simple, actually. Calculate your actual daily water use before you commit to any build. Cooking and drinking for two people runs about 3 to 4 litres a day. Add washing up, brushing teeth, and a basic wipe-down wash, and you’re at 8 to 10 litres. Over three days, that’s 24 to 30 litres, which is roughly 6 to 8 US gallons. Most standard 5-gallon containers hold just under 19 litres. So for a couple going three days between fills, a single container isn’t enough, it’s never been enough, and the maths has always been there to show that.
Sailors also taught us that the source of water matters. Rainwater collection, watermaker filters, marina fill-ups. Van lifers have the equivalent: free water at campgrounds, RV dump stations, visitor centres, many gyms. But you have to plan for it, not hope for it. Two very different things.
2. Twelve Volts Has Been Keeping Sailors Alive for Decades
The 12V DC electrical system in a van build is almost identical, structurally, to the house bank on a cruising sailboat. Battery bank, solar or alternator charging, an inverter for AC loads, a fuse board for distribution. Sailors have been running these systems in demanding marine environments since the 1970s. They’ve learned things through actual experience at sea, not through YouTube, and a lot of that knowledge has trickled through sailing forums and liveaboard communities in ways that haven’t fully crossed into van life yet.
A few things sailors worked out early that van lifers are still relearning:
Lead-acid and AGM batteries shouldn’t be discharged below 50% state of charge. Do it regularly and you’ll cut the battery’s lifespan by more than half. Lithium iron phosphate batteries changed this calculation significantly, they can be discharged to 20% without meaningful damage. But they cost more upfront, which is why Budget Van Journeys has looked at this tradeoff carefully in the DIY van solar setup for under $300 guide.
Solar panel placement on a sailboat also carries a lesson. Sailors position panels to avoid shade from rigging, especially in the morning and late afternoon when the sun angle is low. Van lifers who put a single 100W panel flat on the roof and then park under trees and wonder why their batteries aren’t charging aren’t thinking like sailors. Angle and shade management isn’t optional. A panel in 30% shade loses output disproportionately, not linearly, because of how solar cells are wired in series. Partial shading can cut output by 50 to 70 percent depending on the panel’s bypass diode configuration.
And then there’s the question of what you actually run. Sailors are meticulous about this. They know the radar uses 4A, the chart plotter uses 1.5A, the fridge draws 3A, the cabin light uses 0.8A. They know because at sea they had to know. Van lifers who add an electric blanket, a laptop, a phone charger, a 12V coffee maker, and a fan and then can’t understand why their batteries are flat by 6am simply haven’t done the same arithmetic. It’s not complicated maths. It’s just maths that sailors made a habit of doing.
3. Anchoring, Parking, and the Skill of Reading a Spot
A sailor choosing an anchorage doesn’t just look for somewhere to drop the hook. They read the wind direction, check the forecast for the next 24 hours, assess the holding ground (mud holds better than sand, which holds better than rock), look at how many other boats are already there, and check whether they’d swing into shallow water if the wind shifted at 2am. It’s a whole process, done in a few minutes, but done deliberately every single time.
Van lifers choosing an overnight spot are doing the same thing, whether they realise it or not.
Wind direction matters because a poorly parked van rocks in strong crosswinds and makes sleep miserable. The “holding ground” equivalent is the surface: packed gravel stays put, wet mud doesn’t. Other vehicles parked nearby signal whether a spot is tolerated. Proximity to roads, lighting, and sightlines all factor in. The difference is that sailors have an explicit framework for making this decision. Van lifers tend to pull into a spot and decide within ten seconds based on gut feeling. That’s often fine, but when it goes wrong, it goes wrong badly.
Waking at 3am in a spot that’s turned out to be uncomfortably visible, or in a layby rattling from lorry traffic all night, is fixable once. Making it a habit is not.
There’s a concept from sailing called “swinging room.” You don’t just check where you are when you drop anchor; you check where you’ll be when the wind shifts and you swing around on your chain. Van lifers should be doing the same thing with overnight parking: not just “is this okay right now” but “will this still be okay at 2am when the temperature drops and the road gets busier.” Budget Van Journeys has tested the apps that actually reflect real-world intelligence from other travellers: the 4 free camping apps comparison covers which ones are actually worth using.
Sailors also developed something called the “coconut telegraph,” which is the informal information-sharing network between cruisers in an anchorage. Someone’s been here three nights, they know which spots get swell in the morning, they know the marina charges $12 for water but the beach shower is free. Van lifers have this too, in apps and forums. But sailors developed it as an actual culture of mutual aid before the internet existed, and the quality of the information tends to be better for it.
4. Provisioning Like You Won’t See a Shop for a While
Ocean passage planning involves a provisioning list that would impress a military quartermaster. Calories per day, protein versus carbohydrate balance, what stores well without refrigeration, what can be eaten straight from the tin when the sea is too rough to cook. Sailors crossing an ocean can’t simply stop at the next shop. So they think hard about what they’re bringing and how long it’ll last.
Van lifers aren’t crossing oceans, but the same discipline pays off. The mistake most new van dwellers make is shopping the way they shopped when they had a fixed address: frequently, variably, without much planning. That works when you’re 400 metres from a supermarket. It doesn’t work as well when you’re in rural Wyoming and the next grocery store is 90 miles away. The approach to eating on $15 a day with a real grocery strategy draws on exactly this kind of forward planning, the same logic a sailor uses before a long passage.
Here’s where the two approaches sit side by side:
| Sailor Approach | Van Life Equivalent |
|---|---|
| Calculate water per day, plan refill points | Know daily water use, map refill sources on your route |
| Size battery bank to actual daily Ah draw | Calculate real power consumption before buying batteries |
| Provision for passage length plus 20% buffer | Buy groceries for planned route plus extra for delays |
| Check anchorage for swing room and wind shift | Assess overnight spot for night conditions, not just current ones |
| Maintain two of everything critical | Carry backup charging cables, spare fuses, secondary light source |
| Anchor out instead of marina when possible | Free camp instead of paid sites where regulations allow |
| Check the forecast, plan around weather windows | Check weather before committing to a mountain pass in winter |
The redundancy row in that table is worth sitting with. Sailors have a saying: one is none, two is one. If your only bilge pump fails in a squall, you have a serious problem. If you have two, you have a backup. Van lifers who have one phone, one charging cable, one navigation app, and no paper map are doing the sailing equivalent of having one bilge pump and no manual backup. It sounds fine until the moment it isn’t.
5. Where Most Van Lifers Miss the Lesson
The real gap isn’t technical. It’s about whether van life is something you improvise or something you prepare for.
Sailors don’t improvise their way across an ocean. They prepare obsessively, then adapt when things don’t go to plan. The preparation is what gives them the capacity to adapt when reality diverges from the plan. Van lifers who skip preparation because van life is supposed to feel free and spontaneous often find that their freedom evaporates the moment something breaks. A busted alternator 200 miles from a town is only an adventure story in retrospect, if you had an emergency fund and a basic understanding of your electrical system. Otherwise it’s expensive and stressful in a way that makes people quit entirely.
Sailors changed how I think about repairs. They don’t wait until something is broken to deal with it. A creak that appeared two days ago gets investigated today. A fitting that’s been slightly sticky for a week gets looked at this afternoon. Van lifers who notice a rattle, or a slightly soft tyre, or a belt that sounds different, and decide to deal with it later are adopting exactly the approach that strands people. Budget Van Journeys covers this in the 5 van life budget mistakes that end up costing more, and deferred maintenance is consistently one of the most expensive decisions van dwellers make. Not dramatically expensive, just quietly, persistently expensive in a way that compounds.
The other thing sailors taught us, though it’s harder to quantify, is how to be genuinely comfortable with uncertainty. Not the Instagram version, where uncertainty is romantic and always resolves happily. The actual kind, where you genuinely don’t know what the weather will do tonight, and you’ve prepared as well as you can, and now you sleep. That acceptance is something sailors develop over years. Van lifers who’ve done a winter or two tend to arrive at something similar. The people who stay in van life tend to have it. The ones who leave often didn’t.
FAQs
Do I actually need to know anything about sailing to use any of this?
Not at all. The point is the underlying thinking, not the sailing itself. Treating water as a finite resource, sizing your electrical system to your real daily draw, preparing for repairs before they become emergencies. None of that requires time on the water. It just requires the same careful, unglamorous discipline that sailors apply, transferred to life on roads.
What’s the single most useful thing van lifers can take from sailing culture?
Probably the electrical discipline. Sailors have been running 12V systems in demanding conditions for decades and developed real expertise around depth of discharge, charging rates, and panel placement. A lot of beginner van build mistakes with electrical systems were already solved by the sailing community 20 years ago, and the information lives in cruising forums if you know to look for it.
How do sailors manage condensation, and does the same approach work in vans?
Sailors manage condensation primarily through ventilation, not insulation. A boat with no airflow breeds condensation regardless of insulation quality. In vans, the same principle applies: a roof vent running continuously does more for condensation control than an extra layer of spray foam on the walls. See also what nobody tells you about van insulation for the specific points where van insulation tends to fail in cold weather.
What does “one is none, two is one” mean in practice for a van?
It means carrying duplicates of anything whose failure would strand you or cause real problems. Two phone chargers. A backup power bank. A paper map alongside your phone navigation. A secondary light source when your main van lighting fails. A manual hand pump for water if your 12V pump stops. It doesn’t mean doubling every piece of kit, just the things that have no workaround if they break on a Sunday night 80 miles from anywhere.
My van has a 100W panel and a 100Ah AGM battery. Is that actually enough?
It depends entirely on what you run. A rough reference:
| Device | Approx Draw | Hours Used Daily | Daily Ah |
|---|---|---|---|
| Phone charging | 1-2A | 3 hours | 4-6 Ah |
| Laptop (working) | 3-5A | 4 hours | 12-20 Ah |
| 12V fan (low setting) | 1A | 8 hours | 8 Ah |
| LED van lighting | 0.5-1A | 4 hours | 2-4 Ah |
| 12V compressor fridge | 3-4A | running ~8 hours | 24-32 Ah |
Running all of the above puts you at roughly 50 to 60 Ah per day. With an AGM battery that should only discharge to 50%, your usable capacity is 50 Ah. A 100W panel in good conditions might produce 30 to 50 Ah on a sunny day, considerably less in winter or with shade. So: manageable in summer with discipline, not enough if you’re working from the van daily, and probably tight in winter. Sailors would have calculated this before leaving the harbour.
Somewhere in the cruising sailing world there’s an idea that the best sailors are the ones who’ve made the most mistakes and survived them. Van life works similarly. The people who’ve figured it out carry a certain careful, almost-stubborn preparation underneath an easy exterior. They look relaxed because they planned for the things that could go wrong. They didn’t get lucky. They just thought like sailors.๎๎ป๎๎ป๎น๎
