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.
Requirements for Solar Batteries. Typical requirements for the battery to be used in long term storage are: 1  low specific kWh-cost, i.e. the stored kWh during the whole life of the battery. 2  long lifetime. 3  high overall efficiency. 4  very low self-discharge.5  low maintenance cost. 6  easy installation and operation. 7  high power.he coulombic efficiency is usually measured at a constant discharge rate referring to the amount of charge able to be recalled from the battery (QD) relative to the amount put in during charging (QC). Self-discharge will affect columbic efficiency.