I have the following set up;
MPPT charge controller: https://www.sparkfun.com/products/12885
Load: Raspberry Pi Zero
The battery datasheet states:
Over discharge detection voltage: 2.5V
Over discharge release voltage: 2.85V
Release condition: cut load, release after charging up
What happens is that the load at night drains the battery to 2.5V thus triggering the protection circuitry, upon daylight the battery does not charge nor does the load power up from the MPPT charge controller.
The only way to overcome this is to physically disconnect the battery from the MPPT controller and all works fine again. I assume then that the battery is getting stuck via it’s charge protection circuitry.
I want to avoid the above battery low voltage triggering & manual intervention.
Can someone suggest a circuit/solution that will provide power to the battery & load when there is voltage from the MPPT and disconnect the load when the battery voltage drops to say 2.8v and reconnect the load when the battery voltages charges to say 4V?
How can I implement the following switch in circuitry?