COMBINATION ENERGY STORAGE SYSTEM FOR SOLAR, WIND AND OTHER "NON-DISPATCHABLE" ENERGY SOURCES SERVING VARIABLE LOADS IN VARIOUS CONDITIONS
First Claim
1. ) A compound energy storage sub-system having two types of energy storage devices (e.g. batteries) used in conjunction with a solar, wind, or other non-dispatchable energy source or combination thereof along with a control circuit to manage charging of the energy storage devices and serve a variable electric load. Wherein one energy storage device is capable of deep discharges from 60% to 100% for two to five thousand cycles within 70% of rated energy capacity and a second energy storage device, such as a deep cycle lead acid battery can only deliver on the order of five hundred to one thousand cycles within 70% of rated capacity at the same discharge levels, or similar cycle-life as the first storage device, but with discharges of only 10% to 30%. The control circuit shall employ pulse-width modulation (PWM) techniques in controlling the charge to the energy storage devices.
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Abstract
A compound energy storage system made up of two energy storage devices of different characteristics. The first device is a deep cycle lithium ion battery (or similar characteristics) and the second device is deep cycle lead-acid battery (or similar). Both devices are connected in parallel with control circuitry that manages the charging/discharging of each device in such a way that maximizes lifetime of the combined energy storage system when powering a load. First device acts as primary power source and is cycled daily under normal conditions. Second device provides additional power for periods of extended power draw and low temperatures, when the first device is unable to deliver sufficient energy or unable to take a charge. Excess power from external energy source or reserved in one of the devices shall be used to power components that will control device temperature and optimize overall performance of the storage system.
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Citations
15 Claims
- 1. ) A compound energy storage sub-system having two types of energy storage devices (e.g. batteries) used in conjunction with a solar, wind, or other non-dispatchable energy source or combination thereof along with a control circuit to manage charging of the energy storage devices and serve a variable electric load. Wherein one energy storage device is capable of deep discharges from 60% to 100% for two to five thousand cycles within 70% of rated energy capacity and a second energy storage device, such as a deep cycle lead acid battery can only deliver on the order of five hundred to one thousand cycles within 70% of rated capacity at the same discharge levels, or similar cycle-life as the first storage device, but with discharges of only 10% to 30%. The control circuit shall employ pulse-width modulation (PWM) techniques in controlling the charge to the energy storage devices.
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2. ) The control circuit can employ pulse-width modulation (PWM) as a technique to control the charge to the energy storage devices.
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14. ) For solar lighting applications, the aggregate rated capacity of the combination LIB-LAB energy storage system at 25°
- C. shall be between of 60% and 80% of a conventional LAB rated capacity sized for over 2,500 cycles at 25°
C.
- C. shall be between of 60% and 80% of a conventional LAB rated capacity sized for over 2,500 cycles at 25°
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15. ) For solar lighting applications, the relative rated capacity of the 1st Energy Storage Device (LIB) shall be between 20% and 40% of the aggregate rated capacity of the combination LIB-LAB energy storage system at 25°
- C. The balance of the rated capacity is provided by the 2nd Energy Storage Device (LAB).
Specification