All guides · Power and installation
I would distinguish between what you can see, what the seller can demonstrate, and what a professional needs to measure or assess. A screen that is turned on or a new battery sticker only tells a small part of the installation's condition.
Ask for documentation in advance
Get an equipment list with model numbers, age, and receipts for major changes. Ask for electrical diagrams, manuals, and service information. Note whether the work was done all at once or over time by different owners.
Make your own list of the use the boat must be able to handle: for example, a weekend without shore power, heating in two rooms, or the integration of a new plotter. This allows you to compare the boat's installation with your needs.
| Area | Look for and ask about |
|---|---|
| Batteries | Model, age, mounting, terminal protection, and documented condition. |
| Cables and distribution | Labeling, visible damage, discoloration, fuses, and organized connections. |
| Charging | Which banks are charged by engine, solar, and shore power, and with what settings? |
| 230 V | Inlet, cable, protection, and documentation for changes. |
| Heating and water | Model, service history, accessibility, signs of leakage, and winterization procedure. |
| Navigation | Model numbers, map coverage, network, and the features that actually work together. |
| Bilge pump and alarm | Power supply, maintenance, and safe demonstration of function. |
Ask for a demonstration under realistic conditions
An engine start after a long period of inactivity tells a different story than an already warm engine. Charging should be examined with relevant measurements, and battery capacity requires more than just a voltage reading. Get a professional to plan the necessary tests.
Do not open live panels or loosen battery cables to see what happens. Burnt smells, melted insulation, and visible damage should be investigated before the affected equipment is used any further.
Create three budget lines
Before use: defects and shortcomings that must be clarified or repaired. Before the first long trip: what your planned use requires. Later wishes: comfort and upgrades. Ask for concrete estimates for the big items before you make up your mind.
A review provides a better basis for decision-making
Old components are not automatically useless, and new equipment does not prove correct installation. I would prioritize documented condition and the cohesion of the system.
Use the list as preparation for an inspection. It does not replace an expert boat and installation survey and does not cover the boat's overall structural or mechanical condition. After purchase, an updated component list and a simple diagram can become the starting point for your first improvements.
Sources and manufacturer documentation
Manufacturer documentation checked September 2026. Always follow the manual for the specific model and installation. The calculation examples are simplified examples for planning purposes.
Moving forward with your solution
- Seasonal startup and the boat's power
- Starter battery and service battery
- Replacing an old diesel heater
- Bilge pump and alarm
Send the equipment list and your plans for the boat, and I will help clarify which upgrades are relevant.