It is estimated that batteries have now been with man for a lot more than 500 years. Right here is a great photo that shows the internal components of the Lithium Iron battery and Battery Management System. The NCA battery has nowhere close to the energy rating of an A123 battery or a Winston battery that can simply do more than 5C. So its a characteristic of the cell chemistry that determines the ratio among power and energy. In the end I believe the raw cost per Kwh of the Tesla battery alone at 7kwh for 3000 at minimum of 5000 cycles” is significantly less than 9cents per kwh. It doesn’t matter what the battery kw power rating is if the program is grid tied.
But in order for the PowerWall to function (use AC electrical energy from the grid to charge its battery and discharge battery energy to the house and/or grid), IT WILL Need to have A HYBRID (NOT SMART”) INVERTER & CHARGE CONTROLLER. This unfortunately remains accurate when adding a battery technique in parallel to the PV array: MPPT now adjusts to the combination of PV + battery (charging or discharging), so the far more current gets added/subtracted by the battery, the further off the PV array itself will operate from its maximum energy point. All I would add for now is that it may well be less complicated to merely examine battery costs devoid of other components.
There are factors that go far beyond the per-kWh cost of a battery pack — lifecycle, size, the battery management system, other hardware and software program costs, and so forth. Before the grand announcement, solar panels and all that other stuff have been currently readily available. This is all based on a current Deutsche Bank report leaked to RenewEconomy , by the way.
Although pricing specifics on their utility-scale goods were not released, if they are equivalent to the pricing of their residential item ($three,500 for 10kWh, or $350 per kWh), their base pricing is rather competitive with each other lithium-ion vendors, as well as other battery chemistries. But that might be much more speculation than you happen to be comfortable with, and it does not seriously influence competitors with other battery suppliers currently. I’m not trying to set up it myself – I’ll have the solar installers do it for me, since they’ll know what they are performing.
I am quite certain that you will want to set up a second off grid inverter and AC couple that inverter to your existing inverter or DC couple a second off grid inverter to your solar array. Batteries, attractive packaging, battery management technique, inverter, integration, loads and loads of firmware controlling the batteries in harmony with the electrical loads in a home, seamless integration with a new or pre-current solar technique.