Use Z-Uno as a switch?

Discussion about Z-Uno product. Visit http://z-uno.z-wave.me for more details.
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cmpts_cmp
Posts: 21
Joined: 26 Aug 2019 14:14

Use Z-Uno as a switch?

Post by cmpts_cmp » 02 Sep 2019 18:54

Hi,

Please see attached (quickly done) drawing.

I have two 12v leisure batteries. I'd like to use an automated process to switch between charging. So, if battery #1 falls below 11v for example, I could use a z-uno to switch over the charging to that battery. The charger will charge until the battery is full and then it uses a "float" charge to keep it topped up. So, that battery is ready to be used when the other battery now falls below 11v, and repeat.

Can the Z-Uno handle this sort of switching with a 12v 110Ah battery or is the current too high for it and some additional board is required that the Z-Uno controls? If the latter, what would this look like?

Chris
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PoltoS
Posts: 4921
Joined: 26 Jan 2011 19:36

Re: Use Z-Uno as a switch?

Post by PoltoS » 02 Sep 2019 20:23

Z-Uno do not have relays - only 3V digital outputs. You will need to connect relays to digital pins. Those relays should survive the charging current of your battery.

You can check examples on https://z-uno.z-wave.me/examples or See picture in this tweet https://twitter.com/zuno_zwave/status/1 ... 72352?s=19

cmpts_cmp
Posts: 21
Joined: 26 Aug 2019 14:14

Re: Use Z-Uno as a switch?

Post by cmpts_cmp » 03 Sep 2019 13:53

Awesome. Cheers!

cmpts_cmp
Posts: 21
Joined: 26 Aug 2019 14:14

Re: Use Z-Uno as a switch?

Post by cmpts_cmp » 03 Sep 2019 14:03

Can you recommend any 12v 10A relays? Any good manufacturers?

p0lyg0n1
Posts: 172
Joined: 04 Aug 2016 07:14

Re: Use Z-Uno as a switch?

Post by p0lyg0n1 » 06 Sep 2019 09:54

Hi,
We use relays from FINDER, OMRON and TE Connectivity(AXICOM). If you want to do your own PCB for this project you can look to this brands and select one that meets your requirements (size, maximum current, coil voltage etc). To control relay from Z-Uno pin you need a transistor(for ex. FET IRF7455) and special fast switching diode(for ex. FR157) to prevent transistor from induction voltage of relay. If you don’t want to dig deeper in schematics you could use Z-Uno Shield(it already has 4 transistor to control 12v load) or you can use some shields/modules from sparkfun/adafruit/aliexpress:
https://learn.adafruit.com/adafruit-pow ... eatherwing
https://www.sparkfun.com/products/15093
https://m.ru.aliexpress.com/item/329973 ... 7752747515

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