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PW3 Built-In Inverters

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Question - We are getting two PW3s installed both are the full PW3 (each with their own Inverters), will they use the Inverters in the second PW? Seems to me the second PW3 will be acting as an EXPANSION PACK (not currently available, I asked). So if I lose an Inverter in the main PW3 couldn’t they just swap them and get me back on line?

Having a spare set of Inverters on-site is is worth the $1000 extra your paying for two complete PW3s. I can’t wait for the Expansion pack so I agreed to accept two full PW3s.
 
Are you feeding the PWs with Solar? I'm not sure st the moment what the capacity of the PW3 inverter is, but my system (PW2s) needs 2 inverters, each with a 7.6 kw capacity, to take the production.
Edit- a Google search showed me a Tesla web page stating maximum solar input 20 kw.
 
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