Android app
Boondock Gauge
Boondock Gauge puts your lithium battery, starter battery, propane tank and solar controller on one screen, read straight over Bluetooth. No account, no cloud, works far from any cell tower. Free for one device; Pro is a one-time purchase.
Battery
Hours left
LiTime, Redodo, Power Queen, JBD, JK and Daly BMS: charge, cells, temperature and hours left.
Propane
Days left
Mopeka Pro Check sensors, read without pairing, in percent and pounds.
Starter & solar
The whole rig
BM2 and BM6 starter monitors and Renogy BT-1/BT-2 solar controllers.
Boondock Gauge is an independent app and is not affiliated with any battery, sensor or controller maker named here.