Integrate Solar Charging Solution
Budget: $10 – $30 USD
My 4.5 V circuit needs a small solar panel and the proper charge-management hardware so daylight tops the battery up automatically.
I’m not sure what panel voltage or wattage is best, nor which controller IC will keep the Li-ion safe—so I need your electronics expertise.
Scope of work
– I'll share my schematic of the existing 4.5v circuit
– Select or design a charge-controller stage that handles lithium-ion chemistry, prevents over-charge/over-discharge, and outputs a stable 4.5 V rail to the load.
– Provide a clear schematic, concise BOM with part numbers that are easy to source, and wiring instructions I can follow on perfboard or a small PCB.
– Advise on any protection components (diodes, fuses, reverse-polarity safeguards) so the device remains reliable outdoors.
Acceptance criteria
1. Written explanation showing how the chosen panel and controller maintain safe Li-ion charging within spec.
2. Schematic in PDF or image form plus editable file (KiCad, Eagle, or similar).
3. BOM with distributor links.
4. Quick-start guide (one page is fine) summarising assembly steps and expected performance.
If you can also simulate the design in LTspice or a similar tool, that’s a bonus but not mandatory. Looking forward to seeing how you’ll squeeze the most daylight out of this little 4.5 V setup!
I’m not sure what panel voltage or wattage is best, nor which controller IC will keep the Li-ion safe—so I need your electronics expertise.
Scope of work
– I'll share my schematic of the existing 4.5v circuit
– Select or design a charge-controller stage that handles lithium-ion chemistry, prevents over-charge/over-discharge, and outputs a stable 4.5 V rail to the load.
– Provide a clear schematic, concise BOM with part numbers that are easy to source, and wiring instructions I can follow on perfboard or a small PCB.
– Advise on any protection components (diodes, fuses, reverse-polarity safeguards) so the device remains reliable outdoors.
Acceptance criteria
1. Written explanation showing how the chosen panel and controller maintain safe Li-ion charging within spec.
2. Schematic in PDF or image form plus editable file (KiCad, Eagle, or similar).
3. BOM with distributor links.
4. Quick-start guide (one page is fine) summarising assembly steps and expected performance.
If you can also simulate the design in LTspice or a similar tool, that’s a bonus but not mandatory. Looking forward to seeing how you’ll squeeze the most daylight out of this little 4.5 V setup!