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Currently have 20 panels (Sunpower 335) and 2 Powerwalls with 2 Level 2 chargers on a 200 amp box.

Am getting quotes to add 15 more panels and 1 more Powerwall.

One installer is telling me I will need to upgrade to a 400 amp box to do this. Is this true? Would add > $3000 to the project to do so.

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