Solar powered, 3.3 or 5.0 volt, regulated power supply with lithium iron phosphate (LiFePO4) batteries.Designed by Aetherial Enterprises in United States of America
What it is: This solar powered, 3.3 or 5.0 volt, regulated power supply uses off board photo-voltaic cells to supply charging current to one or two lithium iron phosphate (LiFePO4) 0.6 amp hour batt…Read More…
This solar powered, 3.3 or 5.0 volt, regulated power supply uses off board photo-voltaic cells to supply charging current to one or two lithium iron phosphate (LiFePO4) 0.6 amp hour battery cells mounted in standard AA size holders on the board. Output regulation is accomplished using a buck/boost topology switching regulator which may be disabled during charging. Headers are included for monitoring solar, battery and output voltages using a micro-controller unit (MCU). When the system is disabled (shutdown) the leakage current is less than 10 micro amps, not generally even measurable with most hand held multi-meters.
I developed this item to supply power for various Parallax Propeller and 4D Systems MCU based projects I have designed and have been working on.
This power supply can be used to power virtually any 3.3 or 5.0 volt device which requires less than one amp of continuous direct current.
It includes monitoring pins for the solar cell voltage, battery voltage and output voltage. It also includes a power saving feature for low current operations and the ability to shut the power supply output off while charging, both capabilities can be set with jumpers, a double pole toggle or rocker switch, or can be driven with external circuitry (eg: a micro-controller).
The LiFePO4 batteries used are a safe version of the lithium family which do not exhibit the thermal runaway problems characteristic of other lithium types. In addition they can be run through up to 2,000 discharge cycles while retaining 80% capacity. The power supply's design is such that the battery life will be optimized by limiting the depth of discharge to not more than 80%. The low voltage battery cutoff is about 2.1 volts. Further, while charging the system limits the maximum voltage in a manner which assures the battery does not get over charged. This is accomplished by shunting surplus current when the battery voltage exceeds about 3.35 volts. Battery fusing is provided at 2A to prevent catastrophic failures in event of reversed polarity during battery insertion, however once fused they must be replaced by soldering processes.
THIS DEVICE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE MANUFACTURER, ITS AGENTS, ITS PRINCIPALS, ITS EMPLOYEES OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THIS DEVICE OR THE USE OR OTHER DEALINGS IN THE DEVICE.
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