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Additional gateway/ supporting hardware for Powerwall 2

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New to this forum...

We got a two battery Powerwall system installed at out house (because a single battery option was not available). The PV system on the roof isn't really big enough for two batteries so they barely ever charge fully.

My brother has a house up the road with panels but no Powerwall... Is there a way I can disconnect one of the batteries and set it up at his house? I suppose I would need another gateway and whatever else...

Can someone help? Would love to buy the hardware aftermarket/ direct from manufacturer (if not Tesla) and do this move ourselves.

Thanks in advance.