Relays: Difference between revisions
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=Types= | =Types= | ||
*SPDT - switches between 2 devices, one pole. [https://www.electroschematics.com/spdt-relay-switch/] | *SPDT - switches between 2 devices, one pole. [https://www.electroschematics.com/spdt-relay-switch/] | ||
*DPDT - switches between 2 devices, 2 pole [https://www.electroschematics.com/dpdt-switch-relay/] | *DPDT - switches between 2 devices, 2 pole [https://www.electroschematics.com/dpdt-switch-relay/]. Electromechanical example [https://www.megawatthydro.com/en/current-specials/transfer-relay-dpdt-40-a-240-v--62073] | ||
* | * | ||
=More= | =More= | ||
Revision as of 22:09, 15 April 2023
Types
- SPDT - switches between 2 devices, one pole. [1]
- DPDT - switches between 2 devices, 2 pole [2]. Electromechanical example [3]
More
- common relay and pinout - [4]
Power Draw
A solid state relay will draw .1W on the driving side, but the load side loses significant power (1V drop). 20W loss when running a 20A load - significant through the day. If solar, that is good, but if we are night-time converting, power loses are not so good at this level.
May want a mechanical relay. Sainsmart relay is 15-20mA at 5v to energize. And no voltage drop on the power side, as it's not going through a transistor like in a solid state relay.
5v-15A 120v relay boxes - [5]
Life
- Life of a relay is decent. [6]
- Can be a good long term solution where cycling happens only once or few times per day in off-grid power control automation