FilterGuy
Solar Engineering Consultant - EG4 and Consumers
Note: If anyone is interested, I added a theory of operation to the relay circuit above. It is also copied here:
![1588463442668.png 1588463442668.png](https://diysolarforum.com/data/attachments/12/12420-ea4a52d7eec3f7bd25ced2b5209785c6.jpg)
Turn On sequence
Turn off sequence
![1588463442668.png 1588463442668.png](https://diysolarforum.com/data/attachments/12/12420-ea4a52d7eec3f7bd25ced2b5209785c6.jpg)
Turn On sequence
- The circuit as shown is the starting point with everything off.
Note that in this state, both sides of relay 2 coil are hooked to the positive, so nothing will happen. - The Chargery energizes the signal, causing relay 1 to turn on, connecting pin 1 of the coil of relay 2 to negative.
- Since pin 2 of the coil of Relay 2 is already connected to positive, the coil is energized in a 'positive' direction, energizing the load and flipping the auxiliary contact to B(negative).
- When auxilary contact on relay 2 flipped to negative, both sides of the coil of relay 2 is connected to negative and the coil is de-energized. However, since relay 2 is a bi-stable relay, it does not change state.
Turn off sequence
- The initial condition is that relay 1 is on and the bi-stable relay is on but the coil is not energized because both sides of the relay 2 coil are connected to negative.
- The Chargery turns off the relay signal so relay 1 switches state, connecting the pin 1 of the coil of relay 2 to positive.
- Relay two now has an 'Negative' energized coil with Positive on Pin 1 and Negative on Pin 2. This causes the relay to de-energize the load and flipping the auxiliary contact to “A” (Positive).
- Both sides of the relay 2 coil are now connected to Positive so the coil is de-energized but since it is a bi-stable relay, it does not change state.