Start with power, caravan, and battery calculators. Advanced planning tools stay optional.
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Basics first, advanced optional
Start with Power or Caravan/Boat tools for quick answers. Turn on advanced mode only if you need business and digital planning tools.
Battery, charging, wiring, solar, inverter, and power planning calculators.
Work out how much battery capacity you need for caravan, 4WD, or boat setups.
Minimum required bank: 292 Ah
Suggested lithium bank: 260 Ah
Suggested AGM bank: 360 Ah
Rounded recommendation: 300 Ah
What this means: this is the battery size to target if you want your setup to last your selected number of days. Lithium usually needs less total Ah than AGM for the same usable energy.
Estimate charging time for DC-DC chargers, shore chargers, or alternator-based systems.
SOC increase target: 60%
Charge needed: 120.0 Ah
Estimated charge time: 3.3 hours
What this means: this is a best-estimate from your current charge level to target level. Real-world time can be longer near 90–100% as charging current tapers.
Ideal for 4WD, caravan, and boat house battery planning.
Usable capacity: 160 Ah
Net daily draw: 35.0 Ah/day
Estimated runtime: 4.6 days
What this means: if your daily usage is higher than solar input, this is how many days you can run before recharging. If solar matches/exceeds use, runtime may be ongoing.
Size cable correctly for fridges, chargers, inverters, and DC accessories.
Required minimum: 19.4 mm²
Recommended cable: 4 B&S (~21 mm²)
Estimated drop with recommendation: 2.78%
What this means: smaller voltage drop helps fridges, chargers, and sensitive gear run correctly. If drop is high, go to thicker cable or shorten cable runs.
Estimate how long your fridge can run on battery for camping and touring.
Average current draw: 1.57 A
Estimated runtime: 101.6 hours
Approx days: 4.2 days
What this means: duty cycle is how often the compressor runs. Hot weather, poor airflow, and frequent door opening will increase duty cycle and reduce runtime.
Estimate required panel array for caravan, boat, and off-grid camping loads.
Daily energy target: 960 Wh/day
Minimum panel array: 284 W
Suggested practical size: 300 W
What this means: this is a practical panel size that usually covers your daily energy. Add extra headroom for winter, shade, or cloudy conditions.
For camping, caravan, and boat 240V appliances on battery systems.
Recommended continuous inverter: 875 W
Recommended surge capability: 1400 W
Approx DC draw at full load: 81.0 A
What this means: high DC current needs proper cable size and fusing. If current is very high at 12V, consider a 24V system to reduce cable stress.
Calculate CPAP runtime in a caravan/boat battery bank and compare direct 12V use vs running through an inverter.
Note: a 90W power supply is the maximum adapter rating, not always the actual overnight draw. Use your measured wattage for best accuracy.
Usable battery energy: 1920 Wh
Nightly energy (12V direct): 240 Wh
Estimated nights on direct 12V: 8.0 nights
Nightly energy (via inverter): 364 Wh
Estimated nights on inverter: 5.3 nights
Best option: Direct 12V
Direct 12V advantage: 51.5% more runtime vs inverter (with current inputs).
What this means: running CPAP directly from 12V is usually more efficient than converting battery power to 240V through an inverter. Use your real measured watt draw for best accuracy.
Plan how long your water lasts for trips and off-grid stays.
Total daily usage: 36.0 L/day
Estimated days before refill: 3.3 days
What this means: if your usage stays steady, this is how long your water lasts. Showers, dishwashing, and warm weather can increase daily consumption quickly.
Payload, water, and setup safety checks for touring and marine use.
Estimate branch fuse size while respecting cable current limits.
Design current: 23.4 A
Electrical fuse target: 30 A
Cable-safe recommendation: 30 A
What this means: pick the lower value that still protects cable and allows normal startup surges.
Estimate charger amps needed to hit your target SOC within driving time.
Charge needed: 100.0 Ah
Minimum charger current: 25.0 A
Suggested charger size: 30 A
What this means: choose the next common charger size up so real-world losses and tapering still meet your target.
Forecast solar yield by Australian state and season.
Sun hours used: 5.6 h/day
Estimated output: 1680 Wh/day
Approx at 12V: 140.0 Ah/day
What this means: this gives a realistic seasonal estimate, not a perfect clear-sky maximum.
Compare required capacity, estimated cost, and system weight.
AGM requirement: 400 Ah (~$1400, 120 kg)
Lithium requirement: 250 Ah (~$2250, 30 kg)
What this means: lithium usually wins on usable capacity and weight, AGM can be lower upfront for simple setups.
Quick check of remaining payload against your loaded setup.
Payload allowance: 600 kg
Loaded amount: 640 kg
Remaining payload: -40 kg
What this means: negative value indicates you may be overloaded and should reassess load distribution.
Useful web tools for business owners, creators, and teams. Some are in active rollout.
PDF unlocker note: this is intended for files you own or are authorized to edit.
This site lets you check if your email or password appears in known data breaches.
Powered by Have I Been Pwned, Firefox Monitor can notify you if your details are found.
Another email breach checker with notifications. They also run a non-commercial service.
A simple password safety check using leaked password databases.
Searches for leaked usernames, emails, IPs, and more. Useful for general leak searches.
Note: These sites keep their own databases; entering your info helps them check but avoid sharing sensitive personal data publicly.
Use only on systems you own or are authorized to test.
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Phishing
A scam where attackers trick you into sharing passwords or money through fake emails, texts, or websites.
MFA
Multi-factor authentication adds a second login step, like a code from your phone, to protect accounts.
Malware
Malicious software that can steal information, lock files, or damage devices.
Ransomware
A type of malware that encrypts files and demands payment to unlock them.
VPN
Virtual private network that encrypts internet traffic, especially useful on public Wi-Fi.
Zero-day
A security flaw that attackers can use before a software fix is available.
How to check if a password is safe
How to inspect a suspicious website
This MVP stores contact reminders in your browser only. It does not send messages automatically yet.
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These calculators are planning tools only. For final wiring, fusing, charging profiles, and safety checks, use standards-compliant installation advice.
If you're fitting out or refreshing a boat, we recommend Neptune Boat Flooringfor marine flooring solutions. It's a strong option to pair with electrical upgrades, battery systems, and onboard comfort improvements.
