with how pricing works here battery is basicaly a necessity. They will pay 3-8c /kwh during the day for extra production, and charge 50-65c/kwh when you don't have enough production. Well, maybe necessity is a bit strong. That's only a $5-$8/day swing on a 13kwh battery. But it adds up.

5kwh battery module for 1.2k in the EU. 13.5kw should be under 5k. Any system north of 15k is price gouging, unless the system is huge.

Where do you get batteries that cheap? I’ve been following the market here in the Netherlands and it is about €1000/kWh, going down a bit for batteries approaching 10kWh. Although, I haven’t checked for the last 6 months.

This is a local supplier of Dyness batteries, 15kwh for under 4.5k

https://midlandbatteries.com/products/dyness-15kwh-dl5-0c-ba...