Navalt · Diesel v/s Solar Electric — Boat Powertrain Economics

Inputs

Pick a vessel; values auto-fill by section. Edit anything to override — every tab updates live.

Vessel / platform

Operational

Cruise speed kn

Max speed kn

Hotel load

Non-aircon Aircon

Speed–power curve — 5 points

Speed (kn)Power (kW)

Daily range km/day

Operating days / yr

Advanced

Berthing time h/day

Auxiliary (hotel) load kW

Solar

Plant size kWp

Insolation kWh/m2/d

Advanced

System efficiency %

PV cost INR/kWp

Degradation %/yr

Share to propulsion %

Contribution to consider %

Power train & capital

Power train system (electric) standard catalog

No. of sets

Advanced

Motor margin %

Charging infra INR

Boat shell (ex-system) INR

Battery sizing

Cell / module

Recharge range km

Advanced

DoD %

Degradation buffer %

Battery cooling kW / 120 kWh

System voltage V

Module voltage V

Module capacity Ah

Efficiencies

Advanced

Motor %

Battery %

Elec system %

Alternator %

Fuel & energy

Advanced

SFC engine g/kWh

SFC aux engine g/kWh

Density kg/l

LO / overhaul

Engine/motor loading % avg

Diesel type (powering v/s electric)

Traditional Efficient

Traditional penalty %

Efficient penalty %

Battery life

Advanced

Cycle life cycles

Shelf life yrs

Battery & cell costs

Advanced

Prop cost INR/kWh

Prop replace INR/kWh

Aux cost INR/kWh

Aux replace INR/kWh

Prices

Advanced

Grid tariff INR/kWh

Diesel / petrol INR/litre

Finance

Advanced

Analysis period yrs

OPEX inflation %

Discount rate (NPV) %

Emissions

Advanced

Diesel CO2 kg/L

Grid CO2 kg/kWh

Lowest 20-year cost

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20-year total cost (no discounting)

Up-front capital plus every year's running and battery-replacement cost, summed in nominal rupees — not discounted to present value.

Where the money goes — CAPEX v/s lifetime OPEX

Same 20-year total, split into up-front capital and everything spent running the boat (fuel or grid energy, plus battery replacement).

CAPEX (up-front)Lifetime OPEX (running + replacement)

Cumulative total cost — year 0 to 20

Running total of money spent (capital, then each year's cost), undiscounted. Where an electric line crosses below diesel is the break-even point.

DieselLFPLTO

CAPEX breakdown

Boat shell is fixed per model; power train & ESS scale with motor and battery sizing.

Boat (ex-system)Power trainESSSolar plant

Cumulative cost (NPV basis)

Discounted cumulative cost. Where an electric line drops below diesel is the NPV breakeven.

DieselLFPLTO

Lifetime CO2 emissions

Diesel burns fuel; electric draws grid power for energy solar doesn't cover. Grid factor & solar size drive the result.

Annual CO2 emissions

Per-year CO2 — diesel from fuel burnt, the battery option from grid charging (net of solar).

Energy contribution

Diesel runs on 100% fuel. The battery option's annual energy splits between on-board solar and grid charging.

SolarGridDiesel fuel

Diesel fuel use

Volume of diesel the conventional option burns — the battery option uses none.

What the switch adds up to

Over the analysis period, choosing the battery option instead of diesel saves:

Calculation flowHow the model gets from a vessel choice to the three-way comparison.

Vessel librarySpeed–power curves and per-vessel defaults. Selecting one on the left loads its values.

Diesel v/s Solar electric

Inputs

20-year total cost (no discounting)

Where the money goes — CAPEX v/s lifetime OPEX

Cumulative total cost — year 0 to 20

CAPEX breakdown

Cumulative cost (NPV basis)

Lifetime CO2 emissions

Annual CO2 emissions

Energy contribution

Diesel fuel use

What the switch adds up to

Speed–power curves — slow vessels (≤ 8 kn)

Speed–power curves — medium-speed vessels (6–16 kn)