v1 · Shipping
Core sizing tools.
Solar and battery sizing with PVGIS irradiance. Watermaker capacity vs. electrical budget. Anchor and chain sizing. Wiring diagrams from the electrical package.
Platform · Systems Planning
Plan the systems before you buy the parts.
Solar array sizing from real irradiance data. Battery bank sizing from your actual daily loads. What-if scenarios for power, water, and fuel. Schematic-grade wiring diagrams. Real brands and models with a generic fallback when you have not decided yet.
What's covered
Every major system, planned from first principles.
Almost nothing treats pre-purchase systems planning as a first-class category. Vendor calculators size their own gear. I wanted one place that brings the whole system together — because solar, batteries, watermaker, and engine loads are not independent decisions.
Electrical
Solar and battery sizing.
Solar array sizing uses PVGIS (Photovoltaic Geographical Information System) irradiance data for your boat's typical location and orientation. Battery bank sizing runs from daily load measurements — either entered manually or pulled live from a connected Victron monitor.
- Panel count and wattage recommendation
- MPPT (Maximum Power Point Tracking) controller sizing
- Bank capacity recommendation with autonomy targets
- Charge source balance: solar vs. alternator vs. shore
Water
Watermaker capacity sizing.
Watermaker output recommendation based on crew size, passage duration, and daily consumption. Cross-referenced against the electrical budget — a watermaker that runs 4 hours per day at 8 amps adds up.
- Crew count and daily litres-per-person
- Passage duration and port-stop frequency
- Power draw vs. battery bank cross-check
- Fresh water tank capacity recommendation
Ground tackle
Anchor and chain sizing.
Anchor weight, chain gauge, and windlass sizing from displacement, windage profile, and the worst-case holding conditions you plan to sail into. Based on ABYC (American Boat and Yacht Council) and ISO standards, not gut feel.
- Displacement and windage calculation from boat dimensions
- Recommended anchor weight by type (plough, delta, spade)
- Chain gauge and rode length for intended anchorage depths
- Windlass sizing from chain weight and expected pull
Fuel and range
Motoring range and fuel capacity.
Range at various RPM settings from engine fuel-consumption curves and tank size. Passage planning integration — if the route has a 120-mile motoring leg, does the tank cover it with a 20% reserve?
- Engine consumption curve from manufacturer specs or measured data
- Range map at 1,400, 1,800, and 2,200 RPM
- Reserve calculation by route leg
- Fuel tank sizing recommendation for passage profile
What-if scenarios
Ask the question before you leave the anchorage.
The planning tools are not static calculators. You can model a specific day — your loads, your solar input, the battery state you are starting from — and ask whether a planned activity is safe given the energy budget.
Can I run the watermaker for 4 hours and still have enough power
to start the engine tonight?
Current SOC 68% (170 Ah). Watermaker 8 A for 4 h = 32 Ah draw.
Solar forecast 2.4 kWh today = approx 34 Ah net. Projected SOC
at 18:00: 74%. Engine start requires 5 Ah peak. Yes, with margin.
Is there enough fuel to motor the 90 nm to the next fuel stop
against a 15-knot headwind?
At 2,000 RPM into a 15-knot headwind, estimated fuel burn
3.4 L/h. 90 nm at 5.2 kts = 17.3 h = 58.8 L. Tank at 65 L.
Margin: 10%. Tight. Consider departing early for a better
wind angle or topping up at the anchorage fuel barge.
Can I add a 150 W fridge to the existing electrical system
without increasing solar or batteries?
Daily fridge draw at 30% duty cycle: 108 Ah. Current daily
load: 92 Ah. New total: 200 Ah. Existing bank: 200 Ah usable.
Solar yield at current location: 160 Ah/day average. Daily
deficit: 40 Ah. Bank drains to 40% SOC in 3 days with no
shore power. Add 100 Ah battery capacity or 60 W solar.
Wiring diagrams
Schematic-grade, not decorative.
The wiring diagram component renders real electrical schematics — correct topology, correct symbols, correct wire sizing annotations. Not a simplified illustration; an actual schematic you can hand to a marine electrician.
Generated from the planning data.
Enter your components — solar panels, MPPT controller, battery bank, DC distribution, shore power charger, inverter — and the diagram draws the correct topology. Wire gauge recommendations come from IEC and ABYC standards for the amperage and run length.
Real brands and models are shown where you have made a selection; generic placeholders appear where you have not decided yet. The bill of materials exports alongside the diagram.
The electrician's view and the owner's view.
The same diagram renders in two modes: a detailed schematic with wire sizing annotations for the installer, and a simplified block diagram for the owner who wants to understand the system without reading a schematic.
Diagrams are stored in your boat profile. When something changes — you add a second solar panel, you upgrade the battery bank — you update the component list and the diagram redraws. The current schematic is always in the boat management app.
The wiring diagram component lives in
packages/electrical. It is a first-class package in the
32°N monorepo — not a simplified sketch built for this page. The
full WiringDiagram component renders proper schematics
with industry-standard symbols. Systems planning uses it as its
output layer.
Roadmap
Where this is going.
v1.5 · Next
Reverse generator.
Tell 32°N your power budget and crew plan; get a recommended equipment list in return. "I want fridge, watermaker, and occasional air conditioning — what size solar, battery bank, and generator?" Results include real brands and model numbers.
v2 · Later
AI consultative planning.
Conversational back-and-forth with the AI agent for complex trade-offs. "Can I add a fridge without changing the solar?" gives you the number; "Help me decide whether to upgrade the solar or add a wind generator" gives you a discussion.
Read about the full platform.
The demo lets you explore 32°N without any hardware. The platform page has the five-layer architecture — systems planning sits in the apps layer alongside systems monitoring, the chartplotter, and the rest.