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Isn't the Tesla Powerwall a fully integrated system with multiple MPPTs, inverter, and charger? (Maybe I'm confusing the new one with the older versions) I imagine that's where the cost comes in.

Where I live in Europe I can buy a lifepo4 cell for 97€ from a trusted supplier, 300Ah x 3.2V = almost a kWh. For a full battery you need to add the cost of a BMS and a balancer.

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Electronics in these systems are a low % of the BoM cost though, so wouldn’t expect it to make such a big difference.

If you buy a 16 cells to make a 48V battery than yeah the vast majority of the cost would be the lithium cells, a 16s 250A BMS should be around 150€, an active 16s balancer 50€.

You also need an inverter, a high-quality 8-10 kW unit could approach a thousand euros easily.

I was talking about making a battery, if you want a full solar installation then you also need an inverter, charger, MPPT.

Not sure why you got downvoted.

Its high value-add, but I would have thought competition would push prices down too.

Yes, it's fully integrated and UL listed.

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