Is there a purpose to having both this and the Bluetooth module?

I have the bluetooth from the solar controller. I also have this renogy battery monitor. because the battery monitor is so much more accurate the bluetooth module ( really only serves as a good approximate 'indicator') it does show the voltage and amp input from the solar panels and you get to view this on yr phone which is i guess 'interesting'. But really unless the information is completely accurate it is difficult to actually say it is worth worrying about really.

Can this monitor a 1200ah system?

Yes you can enter your amp hr. Upto 9999

Rv has 2x12v bats in parll. bat1+ feeds 12v bus; bat2- feeds gnd. invrtr + slr chrgr attch to these posts. hw to wire gge for both bus & invrtr cts?

This Renogy Battery monitor is coming with its shunt that most be connected to the negative cable of your two batteries in parallel. No matter how many different loads you are connecting to the positive your Batteries monitor shunt should connect to the negative cable. So, you disconnect the negative cable from the battery and inserts in series the shunt, then the portion negative cable to ground will be be connected from the second post point of the shunt( - load). Try to follow the wiring diagram provided.

Why is this 80? Seems like there are other ones for half the price. Any advantage of having this one?

It seems you haven't took in all the facts. It includes an excellent shunt, well designed, fully thought out. While 80 might seen high to you, some cost much more. I paid 94 and am very happy. A word of advice. What you read on this device will not match any display on your controller. This will seem confusing. It is tracking your batteries, where your controller is tracking a mix of solar in, loads out, battery in, and battery out. Take the time to understand the nuances, and trust this tool. It is excellent.

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Renogy 500A Battery Monitor with Shunt, High and Low Voltage Programmable Alarm, Range 10V-120V up to 500A, 20ft Shielded Cable, Compatible 12V Lithium Sealed, Gel, Flooded Batteries,Black

Renogy 500A Battery Monitor with Shunt, High and Low Voltage Programmable Alarm, Range 10V-120V up to 500A, 20ft Shielded Cable, Compatible 12V Lithium Sealed, Gel, Flooded Batteries,Black

Product ID: 551555081

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Details

Brand
Renogy
Power Source
Battery
Style
Compatible
Colour
Black
Item Weight
75 Grams

⚡500A max current

📏1% measurement accuracy

🔋10V-120V voltage range

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Description

🔌 Power up your battery IQ — never get caught off guard again!

CRYSTAL CLEAR DISPLAY - High-definition backlit screen delivers multiple key metrics—voltage, current, power consumed, capacity, and degradation rate—at a glance.
BATTERY GUARDIAN ALERTS - Stay ahead of battery failure with programmable high/low voltage alarms that flash and backlight for instant warnings.
PRECISION POWER TRACKING - Experience ultra-accurate real-time voltage and current readings with 1% shunt-type precision.
EFFORTLESS REMOTE MONITORING - Install with ease using the transparent shunt holder and 20ft shielded cable for convenient distance battery status checks.
UNIVERSAL BATTERY COMPATIBILITY - Seamlessly monitor Lead Acid, Lithium, and Nickel-metal hybrid batteries across 12V, 24V, and 48V systems.

The Renogy 500A Battery Monitor is a high-precision, versatile device designed to track battery health and performance across a wide voltage range (10V-120V) and up to 500A current. Featuring 1% accuracy, programmable alarms, and compatibility with multiple battery chemistries, it ensures optimal battery longevity and real-time insights via a bright, easy-to-read display. Its 20ft shielded cable and user-friendly installation make it perfect for professional-grade battery management.

Specifications

Brand	Renogy
Power Source	Battery Powered
Style	Compatible
Colour	Black
Item Weight	75 Grams
Item dimensions L x W x H	9.9 x 6.1 x 1.8 Centimeters
Lower Temperature Rating	14 Degrees Fahrenheit
Min. Operating Voltage	10 Volts
Specification Met	RoHS
Upper Temperature Rating	140 Degrees Fahrenheit
Measurement Type	Battery Tester
Maximum Operating Voltage	120 Volts
UPC	810009712206
Manufacturer	Renogy
Global Trade Identification Number	00810009712206
Country of Origin	USA
Item model number	RBM500-G1
Product Dimensions	9.91 x 6.1 x 1.78 cm; 75 g
ASIN	B07RP5B5P7

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