OceanPlanet Energy Calculator

Declare your energy independence

Close defaults

AC Loads
Primary AC voltage
Inverter inefficiency


Suggested efficiencies to enter:

  • wet-cell lead acid - 0.40
  • gel-cell - 0.25
  • AGM - 0.15
  • Lithium-ion - 0.05

Primary DC Loads
Primary DC voltage
Primary bank dischargeand loss

Auxiliary DC Loads
Auxiliary DC voltage
Auxiliary bankdischarge and loss


Renewable Sources
Renewable source voltage

Nonrenewable Sources
Nonrenewable sourcevoltage

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In just a few steps you can calculate your energy deficit or surplus by entering your loads and charge sources. The results will show in the "Running Totals" box as you add values.

Step 1 (Optional). Adjust default voltages and efficiencies by clicking "Defaults" above. The defaults are set for a 12V system with average efficiencies.

Step 2. Begin entering your existing loads and charge sources by clicking "Next" above or skip to any load or source by clicking the corresponding button in the "Running Totals" box.

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Do you know your total daily loads?

If so, enter the value here in Wh or Ah.

If not, click "Next" above to enter loads individually.

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Input your daily AC loads that run off your inverter such as AirCon, water heater, watermaker, laptop/iPad, etc.

Do not include AC loads that you only run off your generator or shore power.

  • Enter the name of the load under "Description".
  • Enter either its amp OR watts rating.
  • Enter the estimated hours of use each day (if less than an hour, enter this as a fraction - e.g. 15 minutes = 0.25 hours).

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DefaultsBackNext

Input daily DC loads on primary battery bank such as lights, autopilot, DC fridge, DC watermaker, pumps, etc.

  • Enter the name of the load under "Description".
  • Enter either its amp OR watts rating.
  • Enter the estimated hours of use each day (if less than an hour, enter this as a fraction - e.g. 15 minutes = 0.25 hours).

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DefaultsBackNext

Input daily DC loads on auxiliary battery bank.

  • Enter the name of the load under "Description".
  • Enter either its amp OR watts rating.
  • Enter the estimated hours of use each day (if less than an hour, enter this as a fraction - e.g. 15 minutes = 0.25 hours).

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DefaultsBackNext

Input your renewable charge sources such as wind or solar.

Enter their output in watts or amps and estimate how long the source is running during a 24 hour period.

For solar, either enter the total rated output in watts or the total output of the controllers in amps (if you have had the ability to measure that in good sun conditions while in use). In both cases, enter "3" in the hours column.

If you have a water generator, assume no output below 5 knots of sailing speed; between 5 & 10 knots, assume an output equal to the boat speed. For any speed above 10 knots, assume 10A. If yours is a 24V boat, cut the amps number in half.

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Input your non-renewable charge sources such as alternator, AC/DC charger (from genset), DC genset, etc.

Enter their output in watts or amps and estimate how long the source is running during a 24 hour period.

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DefaultsBackContact OceanPlanet Energy

-- Results (WATT H/D) --

Known loads:
AC loads:
Pri. DC loads:
Aux. DC loads:
Ren. Sources:
Nonren. Sources:
Deficit:


-- Defaults --

AC LOADS
  Primary AC voltage:
  Inverter inefficiency:
PRIMARY DC LOADS
  Primary DC voltage:
  Primary bank discharge and loss:
AUXILIARY DC LOADS
  Auxiliary DC voltage:
  Auxiliary bank discharge and loss:
RENEWABLE SOURCES
  Renewable source voltage:
NONRENEWABLE SOURCES
  Nonrenewable source voltage:

OceanPlanet Energy Calculator

Your entered data and calculated results are below.

Print / Copy results to clipboard

You can print your results by clicking "print" above. Or, if you would like to contact us for more information, click "copy results to clipboard" above then paste it into the "comments" box on the Contact Us page.

OceanPlanet Energy
72 Front Street #15
Bath, Maine 04530
P. 207-370-9112
E. info@oceanplanetenergy.com

Results

DESCRIPTIONWATT H/D
Known loads
AC loads
Pri. DC loads
Aux. DC loads
Ren. Sources
Nonren. Sources
Deficit

Defaults

AC LOADS
  Primary AC voltage:
  Inverter inefficiency:

PRIMARY DC LOADS
  Primary DC voltage:
  Primary bank discharge and loss:

AUXILIARY DC LOADS
  Auxiliary DC voltage:
  Auxiliary bank discharge and loss:

RENEWABLE SOURCES
  Renewable source voltage:

NONRENEWABLE SOURCES
  Nonrenewable source voltage: