I'm using an arduino nano ESP32, S8050 NPN transistors, a 5V external supply, 3 230V 8W solenoid valves and a WPM400 4-channel relay module. I've connected the solenoid valves to the relays and switching the relays with transistors (I have 5V relays and a 3.3V board), which will switch the 230V supply for the solenoid valves. The only problem is I'm not sure if I'm going to need an RC snubber for each solenoid valve due to the solenoids being inductive loads. The relay module can switch 250V 10A AC non-inductive loads, but as my inductive load isn't high (8W per solenoid valve), I don't think it should be too bad- just unsure whether I need the snubber. The relay module also has opto-isolated inputs, so the snubber would only be for protecting the relay contacts (I think). Can someone help? If you need any more information, just ask. Thanks!
Sounds exotic..
You need to post a schematic. It's a very confusing description. What are the transistors for?
For switching the relays, as they are 5V and my board is 3.3V
Rc snubber could help to protect relay contacts and smooth interferences from spikes.
This says the transistors are between the valves and the relays.
Yeah I worded it weird, I just mean the ESP32's I/O is connected to the transistors, with an external 5V supply for switching the relays, which then switches the solenoids. I've fixed it now
It's probably best to add this just in case. I only heard about an RC snubber today so I didn't even know you could just buy them as a single component.
QED
It rarely hurts. Like you see Shelly recommends to use it with any inductive load on their relays. At least remember them if you ever have weird behavior while turning inductive load off with relays.
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