When people feel their batteries are “draining too fast,” inverter losses are often part of the reason.
Appliance wattage is AC output. Your battery sees a higher demand because conversion is never 100% efficient.
A practical rule of thumb
- Battery draw is roughly AC watts divided by inverter efficiency.
- Add inverter idle consumption for every hour it stays on.
- Tiny AC loads running all day can be expensive in battery terms.
How to reduce the pain
- Use DC versions of always-on loads where practical.
- Use eco/search modes if your appliances behave well with them.
- Avoid leaving a large inverter on overnight for tiny loads.
A few small changes here can noticeably improve runtime without buying more battery capacity.
Use the Off-Grid Planner to run this with your own setup.