Well poop,
City of Palo Alto is now threatening to retroactively enforce the 36" separation rules for ESS units that are
already permitted and installed, anything before the final inspection.
Discussion is ongoing, but an inspector already wrote on our inspection card during the rough inspection, for a job where we had a permit to install a set of stacked Powerwalls. "ESS must be separated by 36 inches"
The reasoning is obscure. UL 9540 is now in the 2nd edition (released 2/27/20) and the Powerwall is listed to the 1st edition. According to UL an ESS listed to 9540 edition 1 needs to be relisted to 9540 edition 2, by July 1 2022. Meanwhile the CBC specifies that the version of 9540 which was code is before the 1st edition, called the outline of investigation, released in 2014 I believe.
CPA is saying any ESS manufactured after 2/27/20 must be spaced 36" apart. We will be fighting this tooth and nail all the way to the highest levels of the city. Its absolutely unfair to retroactively apply new requirements to an existing permit, unless some serious life safety issue is identified. These jobs have waterproofing, HVAC, landscaping all completed. Spacing the Powerwalls 36" apart at this time will cost us tens of thousands of dollars for all the affected jobs.