SejlStrøm · Personal help from Jan
Estimate your power needs before casting off
Estimate onboard consumption. Use the result to start choosing batteries and solar, and send it to me for help with the next step.
Personal help before and after purchase · Delivery details on each product
Boat Power Calculator
Calculate cable size, fuse size, battery bank, solar system and power consumption directly on your phone. Includes realistic daily consumption, peak load, solar sizing and battery sizing.
Advanced system settings
Loads
| Item | W | Qty | Hours/day | Simultaneous? | Wh/day |
|---|
Tip
Add standard items, edit them if needed, and create your own custom rows freely.
Results overview
Real-world note
This calculator uses margin and loss factors so the result is closer to real-life Danish conditions.
Cable size calculator
Good to know
A larger fuse than the load current means the cable should usually be sized after the fuse value.
Fuse size calculator
Important
The fuse must protect the cable, not only the appliance.
Battery bank calculator
Assumption
Lithium is calculated with 90% usable capacity and AGM / lead-acid with 50%.
Solar calculator
Note
Real output depends on season, angle, shading and controller quality.
Summary
Request a quote
Fill in your details and send your calculation directly to SejlStrøm.