Camping battery planner

Check your power from departure to return. Then see what changes without the sun.

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See the example result

Your setup

Saved on this device

01 Time away

Departure

Return

02 Your battery

Rated capacity Wh

Charge when you leave 100%

usable energy

03 Daily equipment

12V cooler / fridgeMeasured energy over 24 hours

Wh/day

Camp lightsPower while switched on

Lights onLights off

PhonesCharging each day

phones

Set a device to 0 to leave it behind.

04 Solar charging

Expected charging input W

Power reaching the battery, not the panel’s rated watts. Use 0 for no charging.

Charging fromUntil

Losses & extra equipment

These assumptions affect every result. Adjust them to your equipment or measurements.

Usable capacity %

Planning reserve %

Start charge and reserve refer to the usable capacity. Reserve is a planning margin, not the battery’s protective cutoff.

DC / USB efficiency %

AC efficiency %

Always-on battery-side draw W

Phone energy per day, each Wh

Charge phones fromUntil

Extra device

Extra device power W

Output

Runs fromUntil

Daily windows may cross midnight. Use different start and end times.

Results update as you edit. Plans stay in this browser.

Trip result

WITH YOUR PLANNED SOLAR

Lowest charge

Charge at return

Planning reserve

Battery over time

% of usable capacity

Entered solar25% of entered solarNo solar

Dashed line = your planning reserve

Compare solar input

Choose a scenario

Sensitivity checks, not weather forecasts. Each keeps your trip and devices the same.

Energy budget

Total battery energy needed

Choosing a power station? Use your result as a checklist →

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Availability and product versions vary by country. Check the exact model against your plan.

How this estimate works

We follow the battery through the trip in time order. Daytime charging cannot pay for a night that has already run out of power. A later recharge never cancels an earlier interruption.

Fridge Wh/day is averaged over 24 hours. Lights, phones and the extra device use their daily time windows. Device energy is divided by the selected output efficiency once. Charging input is already battery-side power; no second charging loss is applied.

Usable capacity accounts for unavailable energy before starting charge is applied. Reserve is a separate planning margin. Example device values are editable assumptions, not promises for your equipment.

Use your campsite’s wall-clock times. Every planning day is 24 hours; daylight-saving changes are not modeled. This estimate does not check ports, surge loads, BMS behavior, charging compatibility, temperature or safe food storage. Check your equipment separately.

Why inputs matter: capacity and conversion losses ↗ · solar conditions ↗. Those sources do not calibrate this calculator.

Camping battery planner.

Your setup

Extra device

Trip result

Battery over time

Compare solar input

Energy budget

Camping battery planner