CampPowerCalc
Size My Solar
energycalculator.blog
CalculateOnline.org
WattSized
HowMuchWatts
Project Sunroof
MyElectricCalc
Hypervector
Camp Power Calc helps you figure out how big a battery, solar panel, and inverter you actually need for off-grid camping and van life. It goes through your real appliance list โ fridge, lights, phone, heater โ and shows the watt-hours, not just a single number. No login, runs entirely in the browser.
CampPowerCalc HypervectorCampPowerCalc's answer
Because it's built by someone who actually camps off-grid. The appliance library comes from real gear lists (not marketing specs), the output shows watt-hours per device (not just a total), and you can tweak individual items to see how adding a 12V fridge or swapping LED bulbs changes your battery needs. No signup, no app download, no email capture โ open the page, run the numbers, done.
CampPowerCalc's answer
Most camping power calculators give you a single "you need X Ah" number and stop there. CampPowerCalc breaks it down by appliance โ fridge, lights, phone charger, heater โ so you can see exactly what's drawing power, adjust the list, and understand the tradeoffs. It supports 6 languages, runs entirely in your browser with no server upload, and is built from real van life and RV camper feedback rather than generic assumptions.
CampPowerCalc's answer
Van lifers, RV owners, overlanders, and car campers who are planning or upgrading their off-grid electrical setup. Also useful for pre-purchase research โ figuring out whether a 100Ah battery or 200W solar panel actually covers their real load before buying gear.
CampPowerCalc's answer
I built it after spending weeks reading Reddit threads (r/vandwellers, r/overlanding) and forum posts where people kept asking the same question: "How big a battery do I really need?" Every answer was either a spreadsheet link or a vague "it depends." CampPowerCalc turns that spreadsheet into an interactive tool that walks through your actual appliance list and shows the math.
CampPowerCalc's answer
Vanilla JavaScript with a static frontend hosted on Cloudflare Pages. No backend, no database, no user accounts โ all calculation happens locally in the browser. The site uses next-intl for 6-language support (English, German, French, Spanish, Japanese, Chinese) with hand-written native translations.
CampPowerCalc's answer
Van conversion DIYers Overland vehicle builders RV campers planning boondocking trips Outdoor gear reviewers sizing power setups Pre-purchase researchers comparing battery/solar configurations
Size My Solar - Free off-grid & DIY solar sizing calculator. Size your battery bank, solar array, charge controller, and inverter from your loads, then compare curated, ranked solar products with real reviews. Works offline.
energycalculator.blog - Easily calculate energy usage, wattage, solar load, and power consumption with our free energy and solar calculators. Convert volts, amps, and watts accurately to optimize efficiency and manage your electricity better. ๐โก
CalculateOnline.org - Free online Solar Calculator
WattSized - Free calculator for sizing a portable power station
HowMuchWatts - Free, accurate calculators for home energy savings โ solar payback, heat pumps, EV charging, appliance running costs and more. No signup.
Project Sunroof - Search for your home. Discover your solar savings potential.
