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solartech12 asked

Streetlight function on Smartsolar MPPT 250/100

I have a Smart solar 250/100 Charge controller for a 48V battery system . my loads are flood lights which are above 4kW .
since this controller does not have a dedicated load output terminals so I am using external relays . I want to use the relay port on the charger to drive the load external relay. recently I came to know about street light function inside victron app but I am not sure about its real used-case scenario.

Can anyone guide me whether I can use this function to drive the relay port on the charger which can then trigger the external relay that will turn the load circuit on . My aim is drive my 4KW load at night time only and also take care of battery capacity too .

MPPT ControllersMultiPlus Quattro Inverter ChargerStreetlight
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wkirby answered ·

Yes, you can use the relay contacts of the MPPT relay to switch the coil current of a following relay.
The specifications for the relay contacts inside the MPPT are in the datasheet:
https://www.victronenergy.com/upload/documents/Datasheet-SmartSolar-charge-controller-MPPT-250-70-up-to-250-100-VE.Can-EN.pdf

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solartech12 avatar image solartech12 commented ·
thank you for the confirmation . Can you also tell whether streetlight function can be used to this programmable relay inorder to turn my loads to be on at specific sunset / sunrise times?

I do have quatro connected in my system along with these charge controllers . so in theory does that mean solar chargers with the help of streetlight fn and relay setting will allow the battery voltage be available at the Quatrro end inorder to run my loads?

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wkirby avatar image wkirby ♦♦ solartech12 commented ·
You cannot define specific times for sunset / sunrise because there is no clock in the MPPT. Sunset / sunrise is estimated by the output from the solar panels.


Are you suggesting to switch the Quattro on and off by its DC cables? If so, do not do that. Much better to use an Aux input "Safety Switch" Assistant to switch the Quattro On or Off with a small signal relay.

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