Electrical
LiFePO₄ across 10 × 12V WattCycle 100Ah bluetooth (internal BMS) batteries. 9 are in the main house bank, one is dedicated to the Electroscan macerator ("electropooster").
Three different capacity numbers are all valid for different things:
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House bank nominal: ~10.8 kWh (9 × 100Ah × 12V)
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Total system nominal: ~12 kWh (includes the 10th battery dedicated to the Electroscan)
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Actual realized: ~11.5 kWh per BMSes when fully charged — not all batteries reach a true 100Ah. This is the right figure for power-budget math (see Jimmy-Shower).
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Main house bank is in starboard salon (relocated from lazarette — see Interior for rationale & layout)
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Main house battery box is King StarBoard
A single AGM starter battery in a battery box under the engine bed (Interstate 27M-XHD, 100Ah).
Installed 2026-05-13 — Removed same day
- Balmar 120A with MC-618 regulator (upgrade from MC-614)
- Serpentine belt conversion on the Yanmar 4JH2E
- Issue: MC-618 regulator was DOA (dead on arrival). Balmar tech support instructed RMA.
- Action: Removed alternator, shunt, and regulator. Returning to stock alternator.
Reinstall planned 2026-05-14 — Photo taken 2026-05-15
Engine electrical bay, May 15 2026 — stock alternator reinstall underway.
- Return to OEM alternator (Yanmar 4JH2E stock unit)
- Required mods:
- Sleeve fabrication — alternator mount needs to sit in a sleeve to align properly
- Wire harness connector replacement — original connector damaged/unsuitable
- SG200 SmartShunt installation deferred pending alternator decision
- May 15: Stock alternator reinstall underway
Order placed 2026-05-13 — Installation pending
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SG200 Battery Monitor Kit (Balmar)
- SmartShunt: 350A continuous, 12V-48V compatible
- Color Display (2.0625" cutout, IP65 front-rated)
- Bluetooth Gateway (SG2-0300) for mobile app access
- SmartLink network supports up to 32 devices
- Status: Parts ordered, installation deferred until charging system finalized
- Add a Victron DC-DC charger to feed the house bank.