OffroadWatt

OffroadWatt — Electrical autonomy calculator for campervans, motorhomes & vans

Free tool to size your off-grid electrical system in real time. Add your appliances, pick a battery bank (AGM, GEL or Lithium, 12V or 24V), configure your solar panels and alternator charging, and instantly see your daily consumption in Ah, your solar and alternator production, the residual deficit and your autonomy in days.

• Battery bank sizing across 34 real market models (AGM / GEL / Lithium, 12V & 24V)
• Solar production estimated across 41 geographic sun zones with MPPT efficiency
• Alternator / DC-DC charging while driving
• Setup comparison with ROI, appliance catalogue and PDF export
• Available in English, Français and Español

Read the campervan electrical guides →