Harrison's have a very slick TV advertising campaign and a responsive sales team who book your installation quickly, and send invoices very effectively. However, my actual install, while ultimately effective, was amateur hour. I didn't get a chance to consult with the installer, my questions went unanswered, and I consider the installation to be rough beyond belief and amateur in the extreme. The electrical aspects work perfectly, and they passed the independent testing, but the damage done to my house during the installation is as yet unaddressed. I expect there to be a certain amount of refinishing after a retrofit, but I was dismayed at the shoddy job done in three specific areas. To install the battery, the installer simply smashed off a length of the kicker at the bottom of the weatherboard wall of my 99 year old kauri villa - an action that in my mind, was completely unnecessary, had I been consulted, I would have suggested an alternative. Now, water is free to run down the wall until it hits the raw kauri (where it will soak, swell, rot and crack the timber), and instead of getting kicked off the wall at the bottom, it will soak under the bottom plate. Getting behind the battery to flash and paint the affected area will be a mission. The new switch board was installed sympathetically, however, the massive overcuts were unnecessary, as was the gouge in the wall adjacent. These will require refinishing, which is a shame - I'm no professional, but I have made several similar installations in the house without making such a mess. The installation of the gateway in the loft is effective, but really annoying to me. Without any consultation, the installer simply screwed it to a piece of plywood I had in the loft, and without trimming it to size, roughly (as in split the timber, and left screws poking through) screwed it to the hand rail. After, that is, screwing the floor down in a slightly different place to where it should be, which will of course, require remedying. The interior refinishing, while it's annoying, isn't a big issue. Leaving my house exposed to the elements is unacceptable. When I emailed confirmation of payment in full for the job, I raised my concerns with both the installer and the Harrisons, the installers email came back as undeliverable (wrong address) and Harrison's response to my concerns was words to the effect of "Let us know if there's anything else you need". Ummm. Weatherproof my house and apologise for the shoddy job would be good. I am delighted with my tesla battery system, but I feel the quality of this $20,000 installation is disappointing. A far cry from the swish TV advertising which makes the process look effortless.