48 lines
2 KiB
Markdown
48 lines
2 KiB
Markdown
# BATTERY
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* 1S LiIon/LiPo (3.7 V nominal)
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* 18650 for easy ubiquitous availability (~3,000 mAh each)
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* connect cells in parallel until we get the capacity we want
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* lipo can charge at 1C
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## CELLS
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[INR18650-35E](https://lygte-info.dk/review/batteries2012/Samsung%20INR18650-35E%203500mAh%20%28Pink%29%20UK.html)
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# POWER BOARD
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[Adafruit 6091](https://www.adafruit.com/product/6091)
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* $7
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* 5-18V input, USB-C or PV/DC
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* CC at 1.0 A, 0.5 A, or 0.25 A
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* handles LiPo/LiIon or LiFePo cells
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* optional thermistor to reduce charge current when battery overheats
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* battery under voltage protection disconnects the battery from the load at 3 V
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* [schematic](https://learn.adafruit.com/adafruit-bq25185-usb-dc-solar-lithium-ion-polymer-charger/downloads#schematic-and-fab-print-3188140)
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Max charge rate is 1 A at 3.7 V nominal battery voltage, which is 3.7 W.
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# PHOTOVOLTAIC PANEL
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Anything 5-18 V should be fine, the charger can't use more than 3.7 W.
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Trying this one: <https://www.amazon.com/Soshine-6w-Performance-Monocrystalline-Cellphone/dp/B09ZL3F7CT?th=1>
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# ALTERNATIVE POWER BOARDS
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## CHARGERS
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1. [5V 2A USB-C](https://www.amazon.com/DWEII-Converter-Step-Up-Charging-Protection/dp/B09YD5C9QC/)
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2. [5V 2A](https://www.amazon.com/Ruiwaer-Discharge-Integrated-Adjustable-Charging/dp/B08QHVW5J8)
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* have on hand (i think)
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3. [Adjustable](https://www.amazon.com/Lithium-Battery-Charger-Charging-Converter/dp/B089NG9TFW)
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* combine with [heatsink](https://www.amazon.com/Printer-Heatsink-Thermal-Conductive-Adhesive/dp/B07RKHRHJV)
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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.
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## BMS
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2. [3S 60A](https://www.amazon.com/dp/B0B9MMZWXC)
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# SOLAR
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* mppt charge controllers:
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1. <https://www.amazon.com/Waveshare-Solar-Power-Manager-Regulated/dp/B0CT2ZBML9>
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2. <https://www.amazon.com/4-4-6-5V-Lithium-Battery-Charger-Controller/dp/B08DY28BXW>
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