Output voltage waveform: Pure sine wave, Output voltage: 110V, Conversion rate: 93% or more, Input voltage: 12V/24V, High-pressure protection: 16v/30v, Peak Power: 3000W/4000W/5000W/6000W, Low-voltage protection: 9.5v/ 20v, Size: (3000W) / 35*15*7CM(4000W) / 38*32*8.5CM(5000W)/42*22*10cm(6000W), Type: Solar inverter, Output frequency: 60Hz.
You can create price alert here, copy coupons and view price history. Let’s see what best price is ATM.
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. Well, there is one coupon available right now.
Link: Banggood product page
1. ($302.05): 2022ACTIESNL
apply code in your basket (cart) after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): 00c906
(these coupons are old, so probably won’t work)
Price history and price alert
Price history (for all/most countries) for 60Hz 110V 5000W Pure Sine Wave Inverter DC 12V/24V is here. The lowest price was: $139.99.
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)).