Here is a selection of currently available low cost Battery Monitors. Prices range from $27 to $77, include freight, and are in NZ dollars. For comparison purposes, all costings are of 100 amp models.
(1) $30. 78 x 42 x 26mm. Shunt based.
Displays all 5 desired parameters simultaneously. Volts. Amps. Battery %, Battery AmpHours and Battery Charge Bar-graph.
But on a fairly small display screen. https://www.aliexpress.com/item/DC-120v ... 0000000000
(2) $54. 60mm diameter. Shunt based.
Shows Battery % bar-graph and any ONE of Volts, Amps, AmpHours and Battery %.
Would be better without the 0.1% battery detail. https://www.ebay.com/itm/350A-DC-8-80V- ... SwrxFdUC2R
(3) $47. 79 x 43 x 25mm. Shunt based.
Shows Volts and Amps OR AmpHours OR Battery %
Cannot show my two priority parameters together – Battery % and Amps https://www.ebay.com/itm/DC-120V-200A-V ... itleDesc=0
(4) $47. 87 x 49 x 14mm. Hall sensor. Wireless.
Shows all parameters all the time.
Plus a LOT of other stuff, so display is very cluttered. https://www.ebay.com/itm/Battery-Monito ... 100623.m-1
(5) $52. 92 x 58 x 32mm. Hall current sensor.
Bluetooth connectivity. This opens up a lot of possibilities.
“Industrial” display with 3 layout options – but none of them contain all 5 of my preferred parameters. https://www.ebay.com/itm/DC-Wireless-Bl ... SwcLxYGu6W
(6) $49. 98 x 54 x 21mm Shunt based. Wireless or cable connectivity.
Displays Volts, Amps, Battery% and % bar-graph.
No AmpHour display. https://www.aliexpress.com/item/DC-120v ... ceBeautify
(7) $37. 76 x 40mm Hall sensor.
Nice clear display
Missing my all-important Battery % readout, though – and has a couple of useless kW additions. https://www.ebay.com/itm/Digital-LCD-Ha ... Desc=0%7C0
(8) $66. 52 x 36 x 16mm. Shunt based.
Has all 5 important parameters.
Has a couple of unwanted extras, so more cluttered than it need be. https://www.aliexpress.com/item/80V-50A ... autifyAB=0
(9) $27. 48 x 30 x 23mm. Hall sensor.
Top line shows Volts. Bottom line shows Amps OR AmpHours OR Battery %
My preferred Battery % and Amps combination not possible. https://www.ebay.com/itm/Battery-Monito ... m570.l1313
(10) $33. 65mm diameter. Shunt based.
Shows all 5 important parameters. Volts, Amps, Battery %, AmpHours and Battery bar-graph.
Has NO unwanted extra parameters.
Display seems to lack contrast, but could be just the photo. https://www.aliexpress.com/store/produc ... 2d75tONNfy
(11) $77. 94mm x 55mm. Shunt based.
Shows all 5 important parameters Battery % (emphasized), AmpHours, Volts, Amps and Battery bar-graph.
Extra large display screen.
Plus a couple of unwanted extras. https://www.aliexpress.com/item/100V-10 ... autifyAB=0
(1) $30. 78 x 42 x 26mm. Shunt based.
Displays all 5 desired parameters simultaneously. Volts. Amps. Battery %, Battery AmpHours and Battery Charge Bar-graph.
But on a fairly small display screen. https://www.aliexpress.com/item/DC-120v ... 0000000000
(2) $54. 60mm diameter. Shunt based.
Shows Battery % bar-graph and any ONE of Volts, Amps, AmpHours and Battery %.
Would be better without the 0.1% battery detail. https://www.ebay.com/itm/350A-DC-8-80V- ... SwrxFdUC2R
(3) $47. 79 x 43 x 25mm. Shunt based.
Shows Volts and Amps OR AmpHours OR Battery %
Cannot show my two priority parameters together – Battery % and Amps https://www.ebay.com/itm/DC-120V-200A-V ... itleDesc=0
(4) $47. 87 x 49 x 14mm. Hall sensor. Wireless.
Shows all parameters all the time.
Plus a LOT of other stuff, so display is very cluttered. https://www.ebay.com/itm/Battery-Monito ... 100623.m-1
(5) $52. 92 x 58 x 32mm. Hall current sensor.
Bluetooth connectivity. This opens up a lot of possibilities.
“Industrial” display with 3 layout options – but none of them contain all 5 of my preferred parameters. https://www.ebay.com/itm/DC-Wireless-Bl ... SwcLxYGu6W
(6) $49. 98 x 54 x 21mm Shunt based. Wireless or cable connectivity.
Displays Volts, Amps, Battery% and % bar-graph.
No AmpHour display. https://www.aliexpress.com/item/DC-120v ... ceBeautify
(7) $37. 76 x 40mm Hall sensor.
Nice clear display
Missing my all-important Battery % readout, though – and has a couple of useless kW additions. https://www.ebay.com/itm/Digital-LCD-Ha ... Desc=0%7C0
(8) $66. 52 x 36 x 16mm. Shunt based.
Has all 5 important parameters.
Has a couple of unwanted extras, so more cluttered than it need be. https://www.aliexpress.com/item/80V-50A ... autifyAB=0
(9) $27. 48 x 30 x 23mm. Hall sensor.
Top line shows Volts. Bottom line shows Amps OR AmpHours OR Battery %
My preferred Battery % and Amps combination not possible. https://www.ebay.com/itm/Battery-Monito ... m570.l1313
(10) $33. 65mm diameter. Shunt based.
Shows all 5 important parameters. Volts, Amps, Battery %, AmpHours and Battery bar-graph.
Has NO unwanted extra parameters.
Display seems to lack contrast, but could be just the photo. https://www.aliexpress.com/store/produc ... 2d75tONNfy
(11) $77. 94mm x 55mm. Shunt based.
Shows all 5 important parameters Battery % (emphasized), AmpHours, Volts, Amps and Battery bar-graph.
Extra large display screen.
Plus a couple of unwanted extras. https://www.aliexpress.com/item/100V-10 ... autifyAB=0