Solar Charge Controller
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| 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? | Stock | Source | Notes |
|---|---|---|---|---|---|
| PCB V2.02 | 1 | ❌ | - | JLCPCB | |
| Arduino Nano | 1 | ✅ | 10 | AliExpress | |
| IRF4905 | 2 | ❌ | - | Reichelt | |
| MBR2045 | 1 | ❌ | - | Reichelt | |
| MP2307 | 1 | ❌ | - | ? | |
| DS18B20 | 1 | ❌ | - | ? | |
| ACS712 | 2 | ✅ | 12 | AliExpress | |
| P6KE36CA | 1 | ❌ | - | Reichelt | |
| 2N3904 | 2 | ❌ | - | Reichelt | |
| Resistor 100k | 2 | ❌ | - | Reichelt | |
| Resistors 20k | 2 | ❌ | - | Reichelt | |
| Resistors 10k | 2 | ❌ | - | Reichelt | |
| Resistors 1k | 2 | ❌ | - | Reichelt | |
| Resistors 330ohm | 7 | ❌ | - | Reichelt | |
| Ceramic Capacitors (0.1uF x 2) | ❌ | - | Reichelt | ||
| 20x4 LCD | 1 | ✅ | 6 | AliExpress | |
| LCD I2C Backplane | 1 | ✅ | 6 | AliExpress | |
| RGB LED | 1 | ✅ | 50 | AliExpress | |
| Bi-Color LED | 1 | ❌ | - | Reichelt | |
| Jumper Wires | ❌ | - | ? | ||
| Header Pins | ❌ | - | Reichelt | ||
| Heat Sinks | 3 | ✅ | 20 | AliExpress | |
| Fuse Holder | 1 | ✅ | 10 | AliExpress | incl. cover |
| Fuses | 1 | ❌ | - | Reichelt | No details as to what kind of fuse. Going with 4A fast blow for now |
| Push Button | 1 | ❌ | - | Reichelt | |
| Screw terminals 1x6 pin | 1 | ✅ | 10 | AliExpress | |
| PCB Standoffs | ? | ❌ | - | Reichelt? | |
| USB Socket | 1 | ❌ | - | Reichelt |
