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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🔋 Power up your control — never miss a volt or amp!

CRYSTAL CLEAR DISPLAY - Get instant insights with a high-definition backlit screen showing voltage, current, power consumption, and battery health.
PRECISION POWER TRACKING - Experience ultra-accurate real-time voltage and current monitoring with 1% shunt measurement precision.
SMART BATTERY PROTECTION - Stay worry-free with programmable high/low voltage alarms that prevent costly battery over-discharge.
UNIVERSAL BATTERY COMPATIBILITY - Seamlessly monitor Lead Acid, Lithium, and Nickel-metal hybrid batteries across 12V, 24V, and 48V systems.
EFFORTLESS INSTALLATION REMOTE MONITORING - Install quickly with a transparent shunt holder and monitor your battery status from up to 20 feet away.

The Renogy 500A Battery Monitor with Shunt delivers precise 1% accuracy voltage and current measurements up to 500 amps. Compatible with multiple battery chemistries and voltages (10V-120V), it features programmable high/low voltage alarms to protect battery health. Its 20ft shielded cable and clear backlit display enable easy installation and remote monitoring, making it an essential tool for professional-grade battery management.

Specifications

Brand	Renogy
Power Source	Battery Powered
Style	Voltage Tester
Color	Black
Item Weight	75 Grams
Item dimensions L x W x H	3.9 x 2.4 x 0.7 inches
Lower Temperature Rating	14 Degrees Fahrenheit
Min. Operating Voltage	10 Volts
Specification Met	RoHS
Upper Temperature Rating	140 Degrees Fahrenheit
Measurement Type	Ammeter, Voltmeter
Maximum Operating Voltage	120 Volts
UPC	810009712206
Manufacturer	Renogy
Global Trade Identification Number	00810009712206
Model	500A Battery Monitor
Item Weight	2.65 ounces
Product Dimensions	3.9 x 2.4 x 0.7 inches
Item model number	RBM500-G1
Batteries	1 Lithium Ion batteries required.
Manufacturer Part Number	RBM500-G1
Voltage	12 Volts

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Renogy500A 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

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