I dont have the tablet connected to the internet so it cant autoupdate. If it works today then it will work tomorrow.
Did this ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Inverters connect to a LAN (next door at the Solar Power Plant) via Solar Assistant,
put the cheap tablet on the wall in the laundry room in the house on a wall wart plug,
tablet only connects to the LAN,
The Official Solar Power Tester can see the SOC and incoming solar on the tablet,
50% SOC and some sun = green light for big loads like electric Dryer.
Internet is not required.
Bonus feature:
out of town last week,
text message comes in 'would like to plan laundry tomorrow but looks like rain all day, SOC 58% now'
I go to my smart plug settings - click schedule, for the smart-plug that controls the "on" relay control for the EG4 Chargverter, set it to close relay during off peak ToU overnight for a few hours,
text message back - "tomorrow will be no problem for laundry"
all good.