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And the Powerwall is also a ripoff vs many other options. 5kw battery module can be for for 1.2k, so 3 modules give 15kwh for under 5k

depends on the market. The 5kw options i was quoted were Enphase 5p batteries, average price from multiple installers was $5k per battery installed.

Needs an inverter though, but if you have solar you already should be ok