I have used this system for 5 years and it is reliable and pretty accurate

Binding: Wireless Phone Accessory
Brand: Xantrex
Studio: Xantrex
Label: Xantrex
Publisher: Xantrex
Manufacturer: Xantrex
List Price: $204.37
Price: $204.47
View more offers Buy New From: $204.37
Features:
  • Link lite Battery monitor
  • Read your Battery Bank like a fuel Gauge
  • Provides critical information about the status of your Battery Bank
  • Displays voltage, current, consumed AMP hours and remaining Battery capacity
  • Secondary Battery Bank voltage monitoring

View more sizes/colors/varieties

Product Description: Link lite battery monitor, Mfg# 84-2030-00, measures currents up to 1,000 Amps, selectively displays voltage, Charge and Discharge current, consumed amp hours and remaining battery capacity. Has an internal Programmable alarm relay.





 

Binding: Wireless Phone Accessory
Brand: Xantrex
Studio: Xantrex
Label: Xantrex
Publisher: Xantrex
Manufacturer: Xantrex
List Price: $103.68
Price: $113.22
View more offers Buy New From: $95.00
Features:
  • Xantrex part number 854-2021-01
  • Xbm Battery monitor connection kit
  • For Use with 84-2031-00 Battery monitor

View more sizes/colors/varieties

Product Description: Xbm battery monitor connection kit, 15 meter, Mfg# 854-2021-01, for use with 84-2031-00 battery monitor.





 

Binding: Sports
Brand: Blue Sea Systems
Studio: Acr Electronics
Label: Acr Electronics
Publisher: Acr Electronics
Manufacturer: Acr Electronics
List Price: $55.84
Sale Price: $55.84 $55.46 You save: $0.38
View more offers Buy New From: $55.03 Used From: $39.98
Features:
  • Shunt type: resistive, manganin metal element
  • Full scale resistance: 50 millivolts
Product Description: DC ShuntFor use with DC Ammeters For continuous operation it is remended that shunts not to be run at more than two-thirds (66%) the rated current under normal conditions Product : BLUE SEA 8255 SHUNT 500 AMP/50 MV Manufacturer : BLUE SEA SYSTEM Manufacturer Part No : 8255 UPC : 632085082550





 

Binding: Misc.
Brand: DROK
Studio: DROK
Label: DROK
Publisher: DROK
Manufacturer: DROK
List Price: $6.18

View more offers Buy New From: $7.90
Features:
  • High accuracy: its Decimal point will automatically move, and it also has a tiny potentiometer to do finer adjustments
  • Easy to connect wires: it only has two wires, the red connects to positive and the black connects to negative
  • Safe to use: with reversed connection protection, it will NOT be burnt even when connected reversely, but the screen display nothing
  • Large screen and bright LED display, and it is well Made, the strong plastic case prevents it from easily damaged by outer force
  • It is perfect to monitor the condition of the battery, especially for solar projects, you can use it on your car, trailer, motor, etc

View more sizes/colors/varieties

Product Description: Technical Parameters:
Dimension: 48×29×22mm
Cutting size: 46×27mm
Measuring voltage range: DC 3-30V
Maximum input: DC 30V (if the input voltage is higher than DC30V, the voltmeter will be burnt)
Minimum input: DC 3V (if the input voltage is lower than DC 3V, the value will be inaccurate or not displayed)
Measurement accuracy: Less than 10V, accurate to 0.01V; More than 10V, accurate to 0.1V (allowable tolerance: 1% +/- 1 word)
Display: 3 digit 0.56'' LED digital tube
Font Color: Green
Refresh rate: about 200mS
No need power supply
Consuming current: less than 20mA (generally 5-15mA)
Operating temperature: -10°c-65°c
Wire length: 20cm
Reverse connection protection: YES
Method of wiring:
Red wire: Positive
Black wire: Negative
Note:
Please don't use this meter in 24V battery because when the battery is full-charged, its voltage will be about 30V
(the max input volt for this meter), and we don't suggest you use it in max volt of 30V.
Package Includes:
1× 0.56'' Voltmeter