Sonnen battery is competitor to Tesla battery, and is already shipping. Local manufacturing is in San Jose, as opposed to somewhere out in the desert. A lot less vaporware and a lot more getting it done. Let's hope they both do well. Sonnen ships its 10,000 solar battery: pv-magazine Sonnenbatterie beats Tesla to the punch with US roll-out: pv-magazine Sonnen announces partnerships for a more full energy storage offering: pv-magazine Energy storage is now: New video interviews with Sonnen USA: pv-magazine In the videos, they say they offer all the real world uses, as opposed to a lot of other battery companies that give out incomplete ideas, and whose product designs don't even seem to be designed and marketed fully for all the real world uses. This speaks volumes to me.