Regarding professional installation, those costs are not factored into the base price. It's an additional cost to both parent's DIY method and the Powerwall. A

Regarding professional installation, those costs are not factored into the base price. It's an additional cost to both parent's DIY method and the Powerwall. As for reputable warranties against breakdowns, please check out the fine print of the Powerwall warranty terms and conditions. It's a '10 year warranty' with some very special legalese baked inside that may make you reconsider the cost premium commanded by guarantees provided by a company very adept at lawyering up and navigating regulation. The warranty (at least in North America) has provisions for voiding warranty claims in off-grid scenarios: during the entire period from installation to claim you must have constant access to the Internet for remote updates. If Tesla detects you go offline, they reserve the right to deny your claim. In addition, if you use the Powerwall for additional applications besides self-consumption of solar power, you're capped at 18 MWh aggregate throughput before the claim is denied. Consider a 6 KWh solar installation for 5 hours daily charging, with the purpose of selling back energy to the grid (not classified as self-consumption). Now also realize that since this is aggregate throughput, all the charging, smoothing, and then discharging to the grid takes 2x the throughput. How many days warranty do you end up getting from this '10 year warranty'? 18 MWh / (6 KWh * 5 * 2) = _300 days_. Finally, the warranty specifically says how they may choose your compensation. Could be an outdated refurbished model, but could also be cash market value of a similar system at the date of claim. Given the exponential rate of dwindling costs for energy storage, that's a gamble that in a few years your warranty may just pay out a tiny fraction of what you originally invested in you were sold a lemon. Tying the luxury price premium to guarantees feels very reminiscent of smartphone insurance... which is almost never a good buy. I'm with parent, let's just be honest here: you're paying for luxury markup -- sexy compact design and a good story.