Solar Charge Controller: Difference between revisions
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| MBR2045 || 1 || ❌ || - || [https://www.reichelt.de/schottkydiode-45-v-20-a-to-220ab-mbr-2045ct-p41956.html?search=MBR2045 Reichelt] || | | MBR2045 || 1 || ❌ || - || [https://www.reichelt.de/schottkydiode-45-v-20-a-to-220ab-mbr-2045ct-p41956.html?search=MBR2045 Reichelt] || | ||
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| MP2307 || 1 || ❌ || - ||? || | | MP2307 || 1 || ❌ || - ||? || step-down should be fixed to 5V for arduino supply? or better [https://www.ebay.de/itm/20pcs-MP1584EN-DC-DC-4-5V-28V-to-0-8V-20V-3A-Adjustable-Step-down-Buck-Module/174539394551 adjustable ones?] | ||
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| DS18B20 || 1 || ❌ || - ||? || | | DS18B20 || 1 || ❌ || - || [https://www.reichelt.de/digital-thermometer-1-wire--0-5-c-to-92-ds-18b20-p58169.html Reichelt]? || temp sensor for battery? maybe he meant [https://www.ebay.de/i/182917673837 this] | ||
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| ACS712 || 2 || ✅ || 12 || AliExpress || | | ACS712 || 2 || ✅ || 12 || AliExpress || | ||
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| Bi-Color LED || 1 || ❌ || - || [https://www.reichelt.de/led-5-mm-bedrahtet-3-pin-rot-gruen-40-mcd-50--evl-339-1sdrsygw-p231036.html?&trstct=pol_2&nbc=1 Reichelt] || | | Bi-Color LED || 1 || ❌ || - || [https://www.reichelt.de/led-5-mm-bedrahtet-3-pin-rot-gruen-40-mcd-50--evl-339-1sdrsygw-p231036.html?&trstct=pol_2&nbc=1 Reichelt] || | ||
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| Jumper Wires || || ❌ || - ||? || | | Jumper Wires || || ❌ || - || [https://de.aliexpress.com/item/4000203371860.html AliExpress]? || which length? what for? | ||
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| Header Pins || || ❌ || - || [https://www.reichelt.de/36pol-stiftleiste-gerade-rm-2-54-sl-1x36g-2-54-p19504.html?&trstct=pol_12&nbc=1 Reichelt] || | | Header Pins || || ❌ || - || [https://www.reichelt.de/36pol-stiftleiste-gerade-rm-2-54-sl-1x36g-2-54-p19504.html?&trstct=pol_12&nbc=1 Reichelt] || | ||
Latest revision as of 23:42, 11 January 2021
| 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 | ❌ | - | ? | step-down should be fixed to 5V for arduino supply? or better adjustable ones? |
| DS18B20 | 1 | ❌ | - | Reichelt? | temp sensor for battery? maybe he meant this |
| 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 | ❌ | - | AliExpress? | which length? what for? | |
| 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 | 4 | ❌ | - | Reichelt | |
| USB Socket | 1 | ❌ | - | Reichelt |
