4) Put the hat in the oven immediately. Don't worry, this won't melt it. The hat is 100% polyester, and as long as you keep it below 446 degrees Fahrenheit, it won't melt. That's why I recommend about 300 degrees Fahrenheit, a sufficient temperature to shrink the fabric and yet not do any damage.
The downside is that the system remains pricey. For an average home, the battery storage system can run $10,000 to $25,000. But with long-term financing options and declining solar photovoltaic prices, the cost can end up penciling out at a price that's competitive with electricity from HECO, said Saturnia.or an average home, the battery storage system can run $10,000 to $25,000. But with long-term financing options and declining solar photovoltaic prices, the cost can end up penciling out at a price that's competitive with electricity from HECO, said Saturnia.
The home stationary battery will be called the Powerwall, and it will cost $3,500 for a 10kWh unit. That unit is optimized to deal with serving a house if the traditional power grid goes down. A cheaper, $3,000 version will have a 7kWh capacity, and it will be able to help a house with solar panels deal with the daily fluctuations in energy supply.