Relays: Difference between revisions
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=Types= | |||
*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/]. Electromechanical example [https://www.megawatthydro.com/en/current-specials/transfer-relay-dpdt-40-a-240-v--62073] | |||
* | |||
*SPST - 50A UL listed $35 [https://www.automationdirect.com/adc/shopping/catalog/relays_-z-_timers/solid_state_relays/ad-ssr650-dc-280a] | |||
=Mechanical vs Solid State= | |||
*Mechanical, 15A, draws 1W [https://cdn.automationdirect.com/static/specs/78relays.pdf] | |||
=More= | |||
*common relay and pinout - [http://tutorial.cytron.com.my/2012/08/01/identify-terminal-pins-of-a-relay-without-reference-to-datasheet-2/] | *common relay and pinout - [http://tutorial.cytron.com.my/2012/08/01/identify-terminal-pins-of-a-relay-without-reference-to-datasheet-2/] | ||
=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 - [https://www.amazon.com/Anfukone-JQC-3FF-S-Z-Electromagnetic-Power-Relay/dp/B081H4BP1M/ref=sr_1_9?dchild=1&keywords=5v+15a+relay&qid=1616137806&s=industrial&sr=1-9] | |||
=Life= | |||
*Life of a relay is decent. [https://electronics.stackexchange.com/questions/167692/are-relays-reliable-for-long-time-use] | |||
*Can be a good long term solution where cycling happens only once or few times per day in off-grid power control automation | |||
=Links= | |||
*[[Solid State Relay]] | |||
*[[Tansfer Switch]]. | |||
Latest revision as of 22:24, 15 April 2023
Types
- SPDT - switches between 2 devices, one pole. [1]
- DPDT - switches between 2 devices, 2 pole [2]. Electromechanical example [3]
- SPST - 50A UL listed $35 [4]
Mechanical vs Solid State
- Mechanical, 15A, draws 1W [5]
More
- common relay and pinout - [6]
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 - [7]
Life
- Life of a relay is decent. [8]
- Can be a good long term solution where cycling happens only once or few times per day in off-grid power control automation