I have a USB adapter plugged into a power port on the dash - it also has a digital voltmeter in it. About $12 from Amazon iirc.
Midnight solar makes a monitor with a series of LEDs that show percentage as a function of battery voltage. About $60 iirc.
BMK 700 series battery monitors. About $150-200 depending on features. Includes a shunt.
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Vince and Susan
2011 Tiffin Phaeton 40QTH (Cummins ISC/Freightliner)
Flat towing a modified 2005 Jeep (Rubicon Wrangler)
Previously a 2002 Fleetwood Pace Arrow 37A and a 1995 Safari Trek 2830.
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