@Soloam
2 relay for interlocking system and add more security.
I never mesure my current but it's low ... not 10A !
Internal clock is not very precise and can vary with external parameters like temperature. And for this project it's better to have good precision.
It's always better to use relay driver and not directly arduino pin.
@nca78 you are right. I'm using ML01SP2 and range is not good (with PCB or IPEX antenna). I'm adding volatge regulator without success. If I put the PCB on a proto board result are far better. So it's probably interference between ESP8266 and NRF24.
I'm waiting for ML01DP5 but do you know if someone already made a pcb for this one and ESP8266 board (Weemos or other) ?
Very bad result with this PCB and Ebyte NRF24 PA+LNA module.
If the shield is distant from the Wemos D1 (not upside) it works fine. There is interference between ESP and NRF I think.
You can try TME. Lot of componments, very good service and delivery in 2 days.
@tbowmo After 2 month on the dev version, no more problem with the gateway. Perhaps it's time to made a new stable release ?
@scalz : any news about this problem ? I would like to move to the new driver but after reading this, I think it will be better to wait 
@tbowmo : Just flash my SBGW today with arduino 1.8.5, last boards.txt and dev branch of mysensors.
We will see if it's more stable. All my Node still in 2.1.1