Estimate Power After AC ↔ DC Conversion
Inverters turn battery DC into household AC; chargers and rectifiers do the reverse. Each step wastes some energy as heat. This independent MEPCODBill tool approximates output watts from the efficiency and power factor you select — it is not a certified measurement.
Use it with the UPS backup calculator and watts-to-amps tools when planning solar or load-shedding setups. Confirm wiring and inverter installation with a licensed electrician.
How the Tool Works (Step-by-Step)
- Enter input power in watts (or use the slider).
- Choose direction: DC→AC (inverter) or AC→DC (charger/rectifier).
- Pick an efficiency band that matches your hardware quality.
- Set AC power factor for motor-like loads (often 0.8–1.0).
- Review estimated output and heat loss — planning figures only.
Inputs Explained
- Input power — watts entering the converter.
- Direction — which way energy is converted.
- Efficiency — fraction of power that is not lost as heat.
- Power factor — AC real vs apparent power ratio for inductive loads.
Formulas in Plain English
AC→DC output ≈ input × PF × efficiency
DC→AC apparent ≈ (input × efficiency) ÷ PF
When Results Differ from Reality
Nameplate efficiency is often peak efficiency at a sweet-spot load. Partial loads, heat, cable drops and poor PF all change the outcome. Always leave headroom when sizing inverters.
How this estimate works
Core logic
AC→DC output ≈ input × PF × efficiency; DC→AC apparent ≈ (input × efficiency) ÷ PF
Assumptions
- Efficiency band matches the hardware quality you select (nameplate peak is often optimistic)
- Power factor adjusts AC real vs apparent power for inductive loads
- Direction (DC→AC inverter vs AC→DC charger) selects which path is applied
Limitations
- Partial-load efficiency, temperature and cable drops change real output
- Not a wattmeter reading or certified lab measurement
- Always leave headroom when sizing inverters for surge loads
This calculator runs entirely in your browser. Inputs are not uploaded to our servers.
Sources & verification
Official sources sit above third-party summaries. Open these pages to confirm the current figure or process.
- PITC Bill PortalOfficial bill when comparing conversion losses to household consumption
Frequently Asked Questions
Why does my inverter feel hot?▼
Conversion losses become heat. Lower efficiency or heavy loads increase waste heat — that is the “lost watts” this estimator highlights.
What power factor should I use?▼
Resistive heaters ≈ 1.0. Motors and compressors often sit near 0.8–0.9. Check the appliance label when available; otherwise use a conservative PF for planning.
Is this the same as a wattmeter reading?▼
No. A clamp meter or wattmeter measures live conditions. This page applies simple efficiency/PF math for budgeting and education only.