While Tesla’s solar roof / Powerwall event isn’t until tomorrow, the product that preceded both, its commercial… cousin, Powerpack, has been upgraded and is already shipping to companies. The company says Powerpack 2 has double the energy density than the original model, paired with a new inverter (made at its Gigafactory), that’s apparently the lowest-priced, highest efficiency utility-scale inverter available. Arguably just as important, the new inverter also simplifies the installation process, with several once-separate components now baked into it.Tesla’s blog calls the new system a “a cost-competitive alternative to other traditional utility infrastructure solutions”. It adds that nearly 300 MWh of Tesla batteries have been deployed so far –including complexes in California. Now, where’s the solar part?