[heebyjeeby]

My battery has arrived now. I got a  22aH battery and 50W panel, hope it is enough for dark Irish winters.

I have everything out on the edge of the garden with solar panel and battery all hooked up. About 30 or 40 metres from my receiver in the kitchen.

After a little bit of tweaking with aerials and placement, everything is working great. I eventually want to put it out in a field as far away as possible as my house and garden are surrounded by big trees. Luckily I am a farmer, have lots of space.

Anyway, I have some more questions/ observations:

I have run a wire from battery + to the bat terminal on TX board, so that battery voltage can be monitored. I measured the battery voltage with my multimeter as 12.8V, but the RX screen and web interface all report 12.3V, 0.5V of a difference. Is this normal / to be expected?
Do I just mentally add .5V on to whatever the RX says?

I am using SHT31 temp sensors and a BME280 pressure/temp sensor. Do people find they have to use calibration offsets for these or are they fairly accurate as they are? I have my height accurately set in the config. We have a potential heatwave here in Ireland next week and I would love to get accurate measurements of temp. 

Thanks,
Tom