Can I use this with a solar controller, how to hook up Aug 17, 2019 23:15:32 GMT -8
Post by gb0101010101 on Aug 17, 2019 23:15:32 GMT -8
I have a cheapo 10A solar controller that I am using with low power solar panel.
This has 3 pairs of connections with +ve & -ve to: solar panel, 12v Lead acid battery, and output.
Output is to relay controlled with:
- 2' LED lights using 0.6A
- 80mm fan 0.15A
- Car antenna motor used to open/close a door 0.7A.
- Relays use 0.06A each with max 4 used so 0.24A total.
- NodeMCU board 0.2A (using wifi)
- RTC DS3221 0.02A
So total output is: 12V 1.91A
Solar panel spec:
- Pmax 10w
- Voc 20.4v
- Isc 0.646a
- Imp 0.588a
- Vmp 17.0v
- FF 76%
- n 15.5%
Can I use the INA3221 to monitor the voltage & current on the 3 channels without modifying it?
I am noob on voltage/current monitoring and am having a problem understanding the hook up diagram on page six of
Can you explain how I would hook this up. AFAIK I would connect all -ve connections to common ground which includes:
- NodeMCU v1 (ESP8266-12E) baord
- INA3221 board
- 12v Battery negative
- Solar panel negative
- Ouput channel on solar controller negative
Then it looks like I have to add a "shunt resistor" to each monitored channel (battery, solar panel, output). Not familiar with this. Am I correct in assuming e.g. Channel 1 Battery:
- Battery -ve goes to solar controller battery -ve and common ground (mentioned above)
- Battery positive goes through "shunt resistor" to solar controller battery +ve connection
- JP2 INA1 +ve is connected to the "shunt resistor" on the battery side of resistor
- JP2 INA1 -ve is connected to the "shunt resistor" on the solar controller side of resistor
What is the resistance value of the "shunt resistor"? Is it 0.1 Ohm for all or doe it change?
Thanks for all input.