I need help switching between DC power sources.
I want to setup a light inside the house run on a solar panel with an automatic switch to mains power when the solar is insufficient (cloudy day / night).
The light is a 36VDC LED light, with an operational range of 36V to approximately 20V.
I want to have two power sources to the light (24 to 36VDC from the solar panel and 36VDC through an AC-DC inverter from the mains power). The solar is to be the primary power source with the mains being the secondary. I want the switching voltage from the solar to be below 24VDC.
I was thinking of using an electromagnetic relay with the NO contacts to solar, the NC contact to mains and the solar on the coil ie. the solar power supplies power while above 24VDC, once below, the relay drops out providing mains power to the light.
Sounds good in theory but Im not sure if it will work;
- Will there be issues with arcing (reducing the life of the relay) if the hold in voltage drops slowly?
- Im not sure if a relay will give a consistent drop out voltage (24VDC) with variations in temperature?
- I would like the drop out voltage to be adjustable in case 24VDC is insufficient for the light (brightness).
Are there any suggestions out there on how to do this?
I want to setup a light inside the house run on a solar panel with an automatic switch to mains power when the solar is insufficient (cloudy day / night).
The light is a 36VDC LED light, with an operational range of 36V to approximately 20V.
I want to have two power sources to the light (24 to 36VDC from the solar panel and 36VDC through an AC-DC inverter from the mains power). The solar is to be the primary power source with the mains being the secondary. I want the switching voltage from the solar to be below 24VDC.
I was thinking of using an electromagnetic relay with the NO contacts to solar, the NC contact to mains and the solar on the coil ie. the solar power supplies power while above 24VDC, once below, the relay drops out providing mains power to the light.
Sounds good in theory but Im not sure if it will work;
- Will there be issues with arcing (reducing the life of the relay) if the hold in voltage drops slowly?
- Im not sure if a relay will give a consistent drop out voltage (24VDC) with variations in temperature?
- I would like the drop out voltage to be adjustable in case 24VDC is insufficient for the light (brightness).
Are there any suggestions out there on how to do this?