I use a small monitor that plugs into the round 12V plug. They are available in most auto parts stores, as they are often used for checking a car battery and the charging system. You can also buy them on Amazon.
I was going to hold off mentioning this until I had tested it more thoroughly but since the topic of battery monitors has come up again... I recently bought this monitor and it seems to be working as advertised. It doesn’t provide as much info as a Victron but it will supposedly send a low battery alert to my phone. Quicklynks Battery Monitor BM2 Wireless Car Battery Tester 12V Battery Load Tester Bluetooth 4.0 Digital Battery Analyzer Battery Voltage Charging and Cranking System Monitor For Android & IOS https://www.amazon.com/dp/B071JR1JPM?ref=yo_pop_ma_swf
San Francisco Bay Area 2013 CS-S us@gi 2015 Toyota Tacoma PreRunner Double Cab
I bought one of these a few weeks ago...instead of having to open up the battery box lid, turn on the power, unlock the doors from under the Pahaque cover just to see the “cigarette lighter” battery monitor...I can step out on the deck and how the battery is from my iPhone (i.e. does it need topping off). Two thumbs up...
J.D. & Sue
Durango, CO 2014/15 S M@xx : "Dory's HabiT@B" Keep on swimming...
Comments
Here is one one randomly selected example.
https://www.amazon.ca/gp/aw/d/B0185234SO/ref=mp_s_a_1_2?ie=UTF8&qid=1527210975&sr=8-2-spons&pi=AC_SX236_SY340_QL65&keywords=12v+meter+digital&psc=1
I recently bought this monitor and it seems to be working as advertised. It doesn’t provide as much info as a Victron but it will supposedly send a low battery alert to my phone.
Quicklynks Battery Monitor BM2 Wireless Car Battery Tester 12V Battery Load Tester Bluetooth 4.0 Digital Battery Analyzer Battery Voltage Charging and Cranking System Monitor For Android & IOS https://www.amazon.com/dp/B071JR1JPM?ref=yo_pop_ma_swf
2013 CS-S us@gi
2015 Toyota Tacoma PreRunner Double Cab
J.D. & Sue
Durango, CO 2014/15 S M@xx : "Dory's HabiT@B" Keep on swimming...