A second battery, and the first one fixed
Sunstak added the second battery to a system another company had installed a year earlier.
What the customer wrote
Sunstak have just added a second Tesla Powerwall battery to my system, which had been installed a year ago by another provider. … The quality and professionalism of the installation was particularly impressive. Several deficiencies in the installation of the existing battery by my previous supplier were rectified without cost or question, even though some were not apparent at the time of quoting.
System specifications
- Battery
- Tesla Powerwall 3
- Battery capacity
- 27 kWh, two units
- Existing battery
- Fitted a year earlier by another provider
- Rectification
- Previous supplier's defects, no charge
About this job
Taking on someone else's install
An installer who connects to existing work owns the result. We check isolation, labelling, cable sizing, mounting and protection on the equipment already there before adding to it. Most of that can be assessed at quoting. Some cannot, because it sits behind a cover or inside a switchboard that stays live until the day.
Defects found after the quote
Faults that appear on install day are a commercial problem as much as a technical one. Either the customer pays through a variation, or the installer absorbs it. Here we corrected the deficiencies in the earlier battery install without a charge or an argument. That included the ones nobody could have seen at quoting.
Two batteries, one system
A second battery is not a spare. Both units share the same backup circuits and the same gateway, so we commission them as one and their charge and discharge stay coordinated. Commissioned separately, a household ends up with twice the hardware and no more useful backup. Done properly, the app shows one system, which is all the owner has to think about.
