Solar Charge Controller
Jump to navigation
Jump to search
| DIY Solar Charge Controller Release status: experimental [box doku] | |
|---|---|
| Description | Trying to build and optimize a DIY solar charge controller |
| Author(s) | Severin |
There are plenty of cheap solar charge controllers out there, but most of them are crap, or just don't really fit our use-cases. And the good ones are expensive. So let's try to DIY one.
Brainstorming
- PWM is ok, MPPT would be much better
- Up to 32V battery voltage would be nice (24V Lead-Acid, 7S Lithium battery packs)
- Free selection of cutoff voltages to accomodate different battery configuraitons (e.g. 3S/4S Lithium packs)
- Data logging/telemetry
"Fancy" PWM controller
Starting point for the first shot at this is Open Green Energy's ARDUINO PWM SOLAR CHARGE CONTROLLER ( V 2.02) instructable. I started ordering some parts from AliExpress, and now "just" need to get the PCB manufactured and we should be good to go.
Group Buy
There were a few people who had shown interest in this project, so I ordered a bigger set of parts.
- Nico
- Uli
- Sebastian (only if MPPT)
Parts
Taken from the instructable, needs some better specification for sure.
| Part | Amount | Got it? | Notes |
|---|---|---|---|
| PCB V2.02 | 1 | ❌ | |
| Arduino Nano | 1 | ✅ | |
| IRF4905 | 2 | ❌ | |
| MBR2045 | 1 | ❌ | |
| MP2307 | 1 | ✅ | |
| DS18B20 | 1 | ❌ | |
| ACS712 | 2 | ✅ | |
| P6KE36CA | 1 | ❌ | |
| 2N3904 | 2 | ❌ | |
| Resistors ( 100k x 2, 20k x 2,10k x 2,1k x 2, 330ohm x 7) | ❌ | ||
| Ceramic Capacitors (0.1uF x 2) | ❌ | ||
| 20x4 LCD | 1 | ✅ | |
| LCD I2C Backplane | 1 | ✅ | |
| RGB LED | 1 | ✅ | |
| Bi-Color LED | 1 | ❌ | |
| Jumper Wires | ❌ | ||
| Header Pins | ❌ | ||
| Heat Sinks | 3 | ✅ | |
| Fuse Holder | 1 | ✅ | |
| Fuses | 1 | ❌ | |
| Push Button | 1 | ❌ | |
| Screw terminals 1x6 pin | 1 | ✅ | |
| PCB Standoffs | ? | ❌ | |
| USB Socket | 1 | ❌ |
Open Points
- License is CC BY-NC-SA. If we want to build on top of this, we would need to clarify the NC part.
- USB port has no fuse, and also no resistors on the data pins. That might be a potential improvement.
