Questions about solar powered ESP/Relay project

I’ve moved this discussion to its own topic, as it has nothing to do with the original weather station discussion.

Pete.

I think the question is more about the circuit of the 12VDC that is being fed from the Solar Controller to the 12V coils and pumps. That is, do you need to add the mt3608 to stabilize the voltage as it could fluctuate from 10.7VDC (Discharge Stop Value) to 14.5VDC (Buck Charge Value). This will be dependent on the pump/coil itself. A stable 12VDC voltage would be good as it is what is recommended by those manufactures. Will the other voltages damage the parts, probably not.

The mt3608 may not be the solution though for a stable 12VDC with the parameters given, as it is a boost convertor. This means it is designed for boosting the voltage up. So while it would work for periods of time where the voltage is <12VDC, it would not work for the periods of time when the voltage was >12VDC. In your case you would want to look for a buck/boost convertor (e.g. THIS) that could handle both the over and under voltage conditions.

Personally I would probably skip it and just run direct off of the Solar Controller, but this decision is up to you, so proceed at your own discretion.

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I certainly wouldn’t use a voltage regulator for these 12v pumps and solenoids.
If you did then you’d probably need more than one, as the current spikes you see when solenoids and motors kick-in will almost certainly exceed what a single regulator can provide.

Pete.

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It might be worth putting fuses separately to protect the relays, but I wouldn’t put a dc converter in front of the solenoids and pumps.

Agreed. I use 12v resettable circuit breakers on my solar setup.

Pete.

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For the question about wifi hotspot and esp8266, just a cable like this is perfect for the job. 51-AyFmm4vL.AC_SX425

This is the pumps and the valves that i have.

the usb power does not need a usb hub, i think this cable might be good.

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That 10A pump is pushing the limits of your relays. I wouldn’t be surprised if your relay contacts start to suffer after a relatively small number of operations.

Pete.

make sure that the load on the relay is higher than the pump’s current draw.

instead of a relay module, fets could be used.

What is you advice for the relays?

Can you send me one image


either way…

Thanks all for your answers i gonna see what is the best option.

You should also see if the output of the charge controller knows this load, because I think you should connect it directly to the battery, not to the output of the charge controller, with fuses.