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    World's Most Comprehensive

    Master Off-Grid Calculator

    The only calculator that interlinks solar, battery, inverter, water, waste, food and full system autonomy in one unified tool. Size your complete off-grid setup in minutes — not hours.

    12 interlinked modules Real-time calculations 100% free, no signup

    Off-Grid Master Plan

    Last saved: just now
    Complexity Level
    Victoria, Australia (4.2h sun, 650mm rain)
    0% Complete
    Next recommended: Appliances — Add at least one appliance to calculate your daily energy needs.

    Select Appliances

    Add appliances to calculate your daily energy load. Adjust frequency for intermittent loads.

    Most Popular for Off-Grid

    Tap to quick-add essentials. Browse categories below for the full list.

    Add Custom Appliance

    Daily Consumption

    0.00 kWh
    Max theoretical: 0W (all on at once)

    Fuse & Breaker Sizing

    Watts don't pick fuses — amps do. Choose your system voltage:

    PLEASE NOTE: these amps are grid-based (set from your IP location) — please change to match your system voltage below. A 12V setup draws roughly 20× the amps for the same watts.

    Peak load (simultaneous)
    0.0A
    Main fuse / breaker
    5A

    Main fuse = peak amps × 1.25 safety margin, rounded up to a standard size. It protects the cable — size the cable for the fuse, never the other way round.

    What does my fuse allow?
    My fuse isA= 3,450W max

    at 230V. Any single load above that blows it — and keep continuous loads under 80% (2,760W) for fuse longevity.

    Usage Breakdown

    No appliances added yet.

    Solar Configuration

    Search a place

    Brisbane, Australia · default — search your address· -27.47000, 153.03000

    Search your address — peak sun hours set themselves from NASA satellite data

    Don't know your kWh? Calculate your load first
    4.2h

    Auto-set from location (4.2h) — adjust to override

    Panels bolted at a set angle. Cheapest, no moving parts.

    Required Array Size

    100 Watts
    System Sufficient
    Daily Prod: 0.3 kWh
    Est. cost (mid): $120 – $180

    System Specs & Cost

    Panel Count (400W)
    1
    Area Needed
    0.5 m²
    Panel Layout (1 × 1)
    See how this array would look on your roof — open the Site Planner
    Peak Sun Hours
    4.2h
    Estimated Cost (mid)$120 – $180

    Budget range affects panel quality & cost per watt only — array size is determined by your load and sun hours. The mid-point of this range feeds into the system total.

    Excess Energy: 0.3 kWh/day

    Your array produces more than you use. Put it to work:

    Store in Battery Bank
    Add 0.3 kWh to your battery bank for evening/night use. The simplest, most efficient option — 90-96% round-trip with LiFePO4.
    Hot Water Diversion
    Heat ~8L of water by 40°C daily. Most common, saves gas/wood.
    Crypto Mining
    ~0.02 USD/day at current difficulty. Free money from waste energy.
    Local LLM / API Hosting
    Run inference on ~1hrs of GPU time. Sell API access.
    Gravity / Pumped Hydro
    Pump water uphill, release through turbine at night. Store ~0.2 kWh.
    Grid Feed-In
    If hybrid system, sell back at ~$0.05-0.15/kWh = $0.03/day.

    Battery Config

    Industry standard for residential off-grid 5kW+ — thinnest DIY-safe cables

    The gold standard for off-grid. 80% usable capacity, near-zero waste heat, lightest option per kWh. Most expensive upfront but cheapest per cycle over lifetime. Won't catch fire.

    : 80%: 96%: 2%/moWeight: 11 kg/kWhCycle life: 3000–5000 cycles @ 80% DODMaintenance: None — BMS handles balancing, no thermal runaway risk

    Required Capacity

    0 Ah@ 48V System
    0.0 kWh Total
    0.0 kWh Usable
    Weight
    0 kg
    Cost/Cycle
    $0.00
    Efficiency Loss
    0.00 kWh
    Self-discharge
    0.00 kWh/2d

    Runtime Estimates

    Based on 0.0 kWh usable capacity

    Critical Loads (Fridge, Lights)0.0 hrs
    Normal Use (TV, Laptop)0.0 hrs
    Heavy Use (AC, Heating)0.0 hrs
    Est. Cost (LiFePO4 (Recommended))$0 - $0

    Compare All ChemistriesShow

    For your 0 kWh/day load with 2 days autonomy

    V2H-Ready EVs (Australia)

    Vehicle-to-Home capable EVs you can source in AU — use your car as a battery bank

    Load Characteristics

    Check any motor-driven appliances you plan to use — this sizes the inverter's surge rating, not the continuous load.

    Large systems 5kW+. Thinnest DIY-safe cables, lowest losses. Industry standard for residential off-grid.

    Recommended Inverter

    0 kW
    Rated for 0 VA continuous
    0W Peak Surge

    Installation Specs

    DC Current (Max)0 A
    Fuse / Breaker0 A
    Wire Size (5m run)1.6mm (14 AWG)

    Model Recommendations

    Click to select — feeds into system cost estimate

    Cable Sizing & Voltage Drop
    Standalone
    ImperialMetric

    Override
    48V DC
    m
    1m5m (recommended inverter)1000m
    1.6mm (14 AWG) — 2.0 mm² — rated 15A
    ThinnestThickest
    1.6mm14 AWG
    Carrying 0A @ 48V over 5m
    0.00Vdrop (0.0%)
    100.0%efficiency
    Voltage at load: 48.0V of 48V

    System Summary

    Based on your current inputs • Victoria, Australia

    Daily Load
    0.0 kWh
    Solar Array
    100 W
    1 × 400W • 0.3 kWh/d
    Battery (48V LFP)
    0 Ah
    Peak Load
    0 W
    Est. Total System Cost
    $150

    Solar $150 + Battery $0 + Inverter $0

    Switch to Intermediate or Expert for more modules

    Australia — Average market
    Estimated Total (equipment only)
    $105 – $203
    Mid estimate: $150

    Equipment costs only — you install yourself

    Component Breakdown
    Solar Array
    $105 – $203
    Low $105Mid $150High $203

    Use the Full System Report or Download PDF buttons above to share this design with local installers and request quotes.

    Show monthly production vs consumption with winter/summer breakdown

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