Electrical Systems

Whistler has a comprehensive 12V/230V electrical system centred around Mastervolt components.

System Overview

Shore Power (230V AC)
       │
Mastervolt Combimaster (inverter/charger)
       │
  ┌────┴────┐
 12V DC   230V AC
  bank      loads
  │
AGM battery bank (main)
  │
Mastervolt MasterShunt 500 (monitor)
  │
Simarine SCP220H (display)

Shore Power

Inlet: 230V connector on the transom
Connect before switching on at the main panel
When connected, the Mastervolt Combimaster charges the batteries automatically
Shore power also heats the hot water boiler

Tip

Always plug in shore power when in the marina — it keeps batteries at 100% and heats water for free.

Battery Bank

Item	Details
Type	AGM (sealed lead-acid)
Capacity	90 Ah starter + 160 Ah house (standard fitment)
Monitor	Mastervolt MasterShunt 500 + Simarine SCP220H display
Target minimum	Keep above 50% (100 Ah remaining)
Low alarm	Set at 20%

The Simarine SCP220H panel (nav station) shows battery state of charge, current draw, and estimated time remaining. Check it regularly when on anchor.

Mastervolt Combimaster

Combined inverter and charger:

Charger mode: Charges batteries from 230V shore power or generator
Inverter mode: Converts 12V DC battery power to 230V AC for appliances at anchor

The Smart Remote panel (nav station or saloon) shows current mode and battery status.

Switching modes: The Combimaster switches automatically between shore charging and inverter output. No manual intervention needed.

Mastervolt EasyView 5

Digital monitoring display that shows Fischer Panda generator integration (if a generator is fitted in future) and full Mastervolt system status. Mounted at the nav station.

DC Panel & Circuits

The main switch panel is at the nav station. Each circuit is labelled. Key circuits:

Circuit	Notes
Navigation lights	Always on at night underway
Instruments / B&G	Powers the NMEA 2000 network and plotters
VHF	Leave on at sea
Anchor light	All-round white — on when anchored
Fresh water pump	Turn off when leaving the boat
Bilge pump	Auto mode — leave on always
Cabins / sockets	Individual circuit per cabin
Fridge	Leave on unless on passage with no shore power for >24 hrs

SLS2 Light Control

The SLS2 ML1901 controls LED lighting throughout the boat. Individual zones can be controlled from the panel or from a smartphone app. Zones typically include:

Saloon overhead
Galley
Cabins (individual)
Cockpit
Underwater lights (if fitted)

Sentinel Boat Monitor

The Sentinel system allows remote monitoring of the boat's status — bilge, battery, temperature, and some switching — via GSM/SMS or a mobile app. Useful for checking on the boat when it is left unattended in the marina.

Galvanic Isolation

The ProMariner ProSafe FS30 galvanic isolator is fitted to prevent galvanic corrosion through the shore power earth when in a marina. It is passive and requires no operation.

230V Sockets

230V sockets are located in: - Saloon (×2) - Galley - Forward cabin - Aft cabins (×1 each) - Heads

These work from shore power or from the Mastervolt Combimaster in inverter mode. Heavy loads (e.g., hair dryers, kettles) drain the batteries quickly in inverter mode — use in marina when possible.