Total Harmonic Distortion: <5%, Power: 3000W, Maximum power efficiency: >86%, Output voltage range: AC 110/220±5%, Overload and short circuit protection: Yes, Input voltage: DC 12v / DC24v, , Low voltage cut-off level: 9.6+/-0.5v, Is there a display screen: No, Output frequency range: 50/60+/-3Hz, , USB output: DC 5V (2.1A), Built-in cooling fan: Yes, No load current consumption: >0.3A, Input DC voltage range: DC12v~DC24v, High voltage cut-off level: 16.8+/-0.5v, Low voltage alarm level: 10.5+/-0.5v, Output waveform: Modified sine wave, Maximum external temperature: <75°C. Check coupons or create price alert down below. What is best price?
Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
Click here to search by yourself. Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China. Too bad there’s no coupon right now in Banggood.
Link: Banggood product page
Price: $-3
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/i1u
Old coupons (from the oldest to the newest): BG589b2e, BGET10, BG8FORMULAMX, BG424324, BGe245a9
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Price history (for all/most countries) for 3000W Power Inverter DC 12V/24V To AC 110V/220V is here. The lowest price was: $29.99.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).