Whether adding electronics or upgrading batteries, understanding your electrical system is essential. Done wrong, upgrades can cause fires or leave you stranded.
Key Components
- Batteries: Store and supply power (battery guide)
- Alternator/Charger: Replenishes batteries
- Distribution panel: Routes power
- Wiring and breakers: Connect and protect
⚠️ Safety Warning
Marine electrical mistakes can cause fires or electrocution. If not confident, hire a qualified marine electrician.
Common Upgrades
Adding Electronics
GPS, fishfinder, radar require adequate circuit capacity, proper wire gauge, marine-grade connections, and fuse protection.
LED Lighting
80-90% less power draw, longer life. Easy upgrade for most boats.
Battery Bank Expansion
More capacity for house loads. Consider AGM or lithium for deep cycling.
Solar/Wind Charging
Maintain batteries at anchor. Requires charge controller and proper sizing.
Wire Sizing
Undersized wire causes voltage drop and fire risk. Use marine wire sizing charts based on amperage and run length.
When to Hire a Professional
- AC (shore power) work
- Major panel upgrades
- Battery bank design
- Any time you're unsure
Find marine electricians through Boatwork.
