A solar-backed Victron system can cover house loads on many liveaboards without daily generator hours — if you size it from a real load audit, not a forum guess.
Step 1: Load audit (most skipped step)
List 24-hour DC and inverter loads: fridge, freezer, lights, instruments, pumps, entertainment. Convert to amp-hours at your system voltage. That number drives battery bank and inverter size.
Step 2: Pick inverter/charger
MultiPlus-II 3000 is the sweet spot for many monohulls; step up for electric cooking or multiple AC units.
Step 3: Size solar and MPPT
Roof space limits watts. Use SmartSolar MPPT 150/70 when panel arrays exceed smaller controllers. Aim to replace 80–100% of daily Ah on sunny days if you are generator-averse.
Step 4: Monitor everything
BMV-712 or Cerbo GX for fleet monitoring. You cannot manage what you do not measure.
Common question: Lithium or AGM?
Lithium wins on cycle life and usable capacity per pound when budget allows. Program MultiPlus charge profiles to manufacturer limits and keep a BMS that talks to your monitor.
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