2-cell TSP solar power board, 2U NWR form factor
OSS, OSHW OSS (OpenWrt), OSHW
The board is a MPPT photovoltaic-input charger for a dual-cell Li-Ion/Li-Po battery pack. It has a single 10-24V PV input, a connection to the battery pack and a capability to provide 5V/4A power to a backplane bus. A STM32F3 MCU monitors the charger, battery and PV parameters and provides a dual CAN/SMBus interface on the NVR PCI-e x1 connector for a backplane connection.
Current status
2020-03-25 HASL prototype PCBs are manufactured. They are waiting to be populated and tested.
Downloads (sources, exports, pictures, firmware images)
| release 0.1.0-20191209 | |
|---|---|
| Kicad 3D renders |  |
| Pictures of prototype PCBs |   |
| Kicad project files | tsp-2c-nwr2u-kicad-proj-0.1.0.zip |
| PCB Gerber files | tsp-2c-nwr2u-gerbers-0.1.0.zip |
| Schematics PDF export | tsp-2c-nwr2u-sch-0.1.0.pdf |
| PCB layout exports | tsp-2c-nwr2u-layout-0.1.0.pdf tsp-2c-nwr2u-values-front-0.1.0.pdf |
Project log
0.1.0 Errata/bugs, feature requests, notes
0.1.0 Roadmap
- [x] PV input on a Molex MicroFit 2x2 pin connector with PV_P, PV_M, PV_DATA, RSVD - [x] Molex MicroFit 2x3 pin battery connector with BAT_P2, BAT_P1, BAT_M, BAT_SGND, BAT_HEAT_P, BAT_NTC_P - [ ] AC input barrel jack connector with 10-24V range - [x] PV input overvoltage protection to 40V - [x] PV input reverse polarity protection to -40V - [x] PV input transient protection - [x] PV input overcurrent protection - [x] Battery input overvoltage and transient protection - [x] Battery input overcurrent protection - [x] Battery input protections should fail in a known manner - [ ] AC input overvoltage, transient and reverse polarity protection - [ ] AC input overcurrent protection - [ ] AC input should fail in a known manner (in OV, OC, reverse polarity) - [x] SMBus/I2C interface on the NWR PCI-e 1x connector - [x] CAN interface on the NWR PCI-e 1x connector - [ ] Multi color/RGB status led on front panel - [x] 5V/4A backplane power output - [ ] AC input disconnects PV input - [x] 3V3 power supply - [x] Battery heater power supply - [x] Battery temperature sensor - [x] PV input DATA port (LIN)