Thought this was interesting. The dam things go out and decent 12v power inverters can get pricey. This Instructables article shows how to build your own about $30.
https://www.instructables.com/DIY-Pure-Sine-Wave-Inverter/
"Build a low cost 12V to 220V (DC-AC) Pure Sine Wave Inverter from scratch! The project is based on the low cost EGS002 SPWM driver board module. The DIY inverter board can handle up to 1kW (depending the transformer size). Around $30 was spent to build this project from locally sourced parts...
...Due to unavailability, I was only able to acquire a surplus 500W 12V-220V UPS Transformer. As far as it goes I was only able to reach 400W with minimal sine wave distortion...
PARTS REQUIRED:
- EGS002 SPWM Inverter Driver Module
- IRF3205 or IRLB4132 MOSFETS (16x)
- 12V to 220V (500W/1000W) Transformer
- TO-220 Isolation Set (16x)
- TIP31C NPN Transistor
- 7805 Regulator
- 1N4007 Diode (8x)
- 10k Ohm NTC Thermistor
- 10k Ohm Multi-turn Trimmer
- 10 Ohm Resistor (4x)
- 2.2k Ohm Resistor
- 10k Ohm Resistor (4x)
- 100k Ohm Resistor (2x)
- 470nF 25v Capacitor
- 2.2uF +350v Capacitor
- 2.2uF 25v Capacitor
- 10uF 25v Capacitor
- 100uF 25v Capacitor
FOR HOMEBREW PCB:
- Photopositive Presensitized PCB
- Developing Solution (Sodium Hydroxide)
- Etchant (Ferric Chloride)
- Hacksaw
Its not for N. America voltage.