Anker SOLIX C2000 Gen 2 Portable Power sells on Amazon. I think the price is very good. Please read some of the reviews and see people thought of the product.**If you’re not sure whether to buy, add to cart, and you can come back to it later!**

Ultra-Efficient Power for Longer Runtime: Only 9W idle power consumption reduces conversion loss whether running or on standby, powering a dual-door fridge for up to 32 hours. Up to 4kWh Expandable Capacity: Start with 2,048Wh (2kWh) capacity and expand it up to 4kWh with a single expansion battery. This extra power can keep a dual-door fridge running for up to 64 hours.