From f4db30f9d6a510bd223f96cd761ec4d6eca9c714 Mon Sep 17 00:00:00 2001 From: Sebastian Kuzminsky Date: Fri, 29 Aug 2025 23:14:49 -0600 Subject: [PATCH] add another solar battery charger option --- hardware/power.md | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/hardware/power.md b/hardware/power.md index 51c5c34..c76b59e 100644 --- a/hardware/power.md +++ b/hardware/power.md @@ -14,7 +14,13 @@ Strawman design proposal: 1S LiPo, 18650 for easy ubiquitous availability * have on hand (i think) 3. [Adjustable](https://www.amazon.com/Lithium-Battery-Charger-Charging-Converter/dp/B089NG9TFW) * combine with [heatsink](https://www.amazon.com/Printer-Heatsink-Thermal-Conductive-Adhesive/dp/B07RKHRHJV) - +4. [Adafruit 6091](https://www.adafruit.com/product/6091) + * $7 + * 5-18V input, USB-C or PV/DC + * CC at 1.0 A, 0.5 A, or 0.25 A + * handles LiPo/LiIon or LiFePo cells + * optional thermistor to reduce charge current when battery overheats + * [schematic](https://learn.adafruit.com/adafruit-bq25185-usb-dc-solar-lithium-ion-polymer-charger/downloads#schematic-and-fab-print-3188140) strawman: charging up to 4v with the INR18650 (see `CELLS:INR18650-35E` for the discharge capacity graph, and `CHARGERS:3` for 4V cutoff w/ a 5V panel) gives us ~3000mAh, or 88% of the 3398mAh tested battery life.