It's an interesting qiestio
Very interesting move as we should see Sunrun and Tesla bump heads over the next year battling for solar supremacy in the US market. My ideal situation was for Tesla to buy Sunrun around the end of this year to bridge the logistics and SERVICE gaps at Tesla Energy's residential wing.
Buy Sunrun for $1.3B and fire all the salespeople, you got an instantly profitable enterprise. They currently lose ~$50M a quarter, but that's all sales cost. Tesla's customer acquisition strategy ain't got much sales cost. Worth keeping an eye on for sure.
Shrewd move to sell hem a high margin product they can install at a loss.