shows the battery voltage & solar charge but the used by inverter and remaining hours is blank - how do i get this to read?

This charge controller device does not monitor your separate inverter. Only the battery and the solar charge. There are 12 volt load terminals on the charge controller but those should not be connected to an inverter per the manufacturer's requirement. However turning off the inverter and monitoring the battery state of charge will let you know how much charge is left to get to the lowest recommended level of 20%. Full charge depends on the battery type: 12.7 for lead acid, 13.0 for AGM, and 13.6 for LiFePo4. If it shows higher that it is showing the higher solar charge voltage. You can calculate the load on the battery by multiplying the amps of the 120 volt appliances by 10. Then divide the amp hour of the battery (times the current state of charge that this device shows less 20% ) by the 12 volt amp load to get number or hours remaining. Make sure you turn off your inverter when not using your 120 volt appliances.

Are there better instructions than the booklet that offers zero explanation of how the device and or the app works to properly monitor my system?

Try Ytube it has some decent videos

Battery charging volts is set at 14.4v, but app shows max battery voltage at over 20v. is this normal? lifepo4 battery set to lithium on controller.

Check to see if the over 20v is the voltage of the solar panel. It is normal for solar panel voltage to be near 20 v. The controller steps it down to 12 to 14.4 voltage.

Can it be mounted outside?

I don't see why it wouldn't be okay outdoors. The unit is well sealed. UV exposure is my only unknown.

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Renogy Bluetooth Module RJ12 Communication Port Compatible Rover/Wanderer/Adventurer Charge Controllers, BT-1 RS232,Black

Renogy Bluetooth Module RJ12 Communication Port Compatible Rover/Wanderer/Adventurer Charge Controllers, BT-1 RS232,Black

Product ID: 283347314

Details

Brand
Renogy
Colour
Black
Item weight
130 Grams
Material
Plastic
Product dimensions
6.7L x 3.5W x

📱Bluetooth 4.2 + BLE tech

📶82ft wireless range

🔋Solar powered, no extra battery

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Description

🔋 Stay powered, stay connected—solar control at your fingertips!

PLUG PLAY POWER - Powered directly through RJ12 port—no extra cables or batteries needed.
EXTENDED SIGNAL REACH - Stay connected up to 82 feet away—freedom to manage from anywhere nearby.
SEAMLESS WIRELESS CONTROL - Monitor and adjust your solar system effortlessly via Renogy DC Home app.
ENERGY EFFICIENT BLUETOOTH - Embedded chip ensures fast, stable communication with minimal power draw.
DURABLE WEATHER RESISTANT - IP54 protection grade means reliable performance in diverse environments.

The Renogy BT-1 Bluetooth Module enables wireless monitoring and control of compatible Renogy solar charge controllers via Bluetooth 4.2 and BLE technology. Powered directly through the RJ12 communication port and featuring an 82-foot signal range, it connects seamlessly to the Renogy DC Home app for real-time system management. With IP54-rated durability and energy-efficient embedded chip, it offers a reliable, cable-free upgrade to your solar setup.

Specifications

ASIN	B0894SDTSL
Best Sellers Rank	223,216 in Business, Industry & Science ( See Top 100 in Business, Industry & Science ) 248 in Solar & Wind Energy PWM Controllers
Brand	Renogy
Colour	Black
Customer Reviews	4.4 4.4 out of 5 stars (2,032)
Display Type	LED
Global Trade Identification Number	00810009714415
Included Components	BT, Manual
Item Dimensions L x W x H	6.7L x 3.5W x 1.4H centimetres
Item Type Name	Compatible with Renogy Rover/Wanderer/Adventurer Charge Controllers
Item Weight	130 Grams
Manufacturer	Renogy
Manufacturer Part Number	BT-1 Bluetooth Module
Material	Plastic
Model Number	Bluetooth Module
UPC	810009714415

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