Tuya / Smart Life / WIFI battery voltage monitor

I've got a lot of stuff using the Tuya / Smart life systems. I'd like to turn it on and off using battery voltage on my 48 v battery system as the control source.

I can remote monitor the battery with my sol ark app or my bluetooth from the jk-bms

but no smart life access

I understand there is a home assistant solution posted about here:

My googling didn't turn up anything but AC products for Tuya.

Anyone know of anything?

You need a battery monitor with dry contacts support. Then hook your dry contacts to Tuya mini smart switch. It has 6 contacts. Lin, Lout, Nin, Nout and S1, S2.

Every time when S1 and S2 are connected your smart switch changes its state, connects AC loads on Lout, Nout, runs scenes if any. It can work without AC loads, just to run scenes.

Seems like I have the same kind of problem I am looking relatively dumb and cheap standalone battery monitor, but with dry contacts support.

byteharmony said:

I've got a lot of stuff using the Tuya / Smart life systems. I'd like to turn it on and off using battery voltage on my 48 v battery system as the control source.

I can remote monitor the battery with my sol ark app or my bluetooth from the jk-bms

but no smart life access

I understand there is a home assistant solution posted about here:

Looking for reliable battery monitor suggestions

I have a 16s 48V pack made with EVE 105ah cells and I am having a hard time finding a monitor that is fairly accurate. I have tried a few but not making much progress. In the latest example, the pack is fully charged and at rest. The voltage reading is fairly good given that it’s only I...

diysolarforum.com

My googling didn't turn up anything but AC products for Tuya.

Anyone know of anything?

Click to expand...

Going down the home assistant route would give you more control but it's likely alot of work to move all your tuya stuff over to ha then integrated your jk bms via esphome, best think I could think of is some form of tuya power monitoring device but all I can find is AC versions, anything with solar or DC in the title is just AC on closer inspection.

I have everything on Home Assistant. As discovered, Tuya like devices are generally for domestic AC. For monitoring the batteries and solar I use esp32's connected to HA. These can connect to the battery via bluetooth but I found wired connection more reliable.

With this setup easy enough to control Tuya/smart device from battery voltage. I have a small GTI plugged into a smart plug and when the voltage reaches a set level it turns off. Turns on again at another voltage level

Shelly switches run off AC but their switching contacts can operate on DC. You can control Shelly's in node-red a lot easier than Tuya's which are too buggy in my experience. I use the Plus 1 Shelly's