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Old 09-26-2014, 03:27 PM   #1
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Batteries, monitoring house voltage

Hi folks— 9/26/14

I need to know a way to wire a 12v dc digital meter to the front of my motor home’s overhead cabinet so I can tell how the house batteries are doing. Maybe install it in the wall next to the fridge?
It seems that the voltage to all my overhead lights run at 12 volts regardless of house battery voltage is running at (buck/ booster somewhere?). New to dry camping and I’d like to keep the battery drawdown @ 25%.
Xantrex remote has a voltage monitor but it isn’t a digital readout and tapping into that circuit reads 36+ volts.
Thanks.
Scotty
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Old 09-26-2014, 03:50 PM   #2
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Quote:
Originally Posted by scotcee View Post
Hi folks— 9/26/14

I need to know a way to wire a 12v dc digital meter to the front of my motor home’s overhead cabinet so I can tell how the house batteries are doing. Maybe install it in the wall next to the fridge?
It seems that the voltage to all my overhead lights run at 12 volts regardless of house battery voltage is running at (buck/ booster somewhere?). New to dry camping and I’d like to keep the battery drawdown @ 25%.
Xantrex remote has a voltage monitor but it isn’t a digital readout and tapping into that circuit reads 36+ volts.
Thanks.
Scotty
Here is a cheap route, plugs in to cigarette lighter NEEWER® Mini LED Display Digital Car Volt Meter 12V/24V Vehicle Voltage Gauge - Voltage Testers - Amazon.com
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Old 09-26-2014, 06:15 PM   #3
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depending on your tank situation. I have Seelevel II tank monitoring gauges. One of the functions they have available is battery voltage.
It gives a digital readout of the battery voltage for the coach.
It also has tank level gauges that actually work.
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Old 09-26-2014, 06:25 PM   #4
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Been there done that. Don't know how I lived without it. I would suggest putting in a volt and amp meter. I find the amp meter to be more useful.
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Old 09-26-2014, 06:35 PM   #5
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How about a 12v outlet with an inexpensive pluggable 12v gauge, e.g. this one:
http://www.amazon.com/Display-Digita.../dp/B00962CQNC

Are if you prefer a mounted gauge, how about a Scorpion or Stinger 12v gauge:

Black 12 Volt Voltage Meter Red LED DVM3R SVMR New | eBay
★ New Xscorpion Red LED Car Stereo Digital Voltage Meter Amp 12 Volt Power ★ | eBay

Or maybe a low voltage alarm gadget like this Voltminder:
http://www.voltminder.com/
http://www.batterystuff.com/battery-...oltminder.html
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Old 09-26-2014, 06:41 PM   #6
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Depending on a voltage reading is only 1 part of the equation when dry camping and gives an skewed value of actual charge because the batteries are in use. You also need to know the amperage ins/outs also for dry camping. Therefore, a battery monitor is beneficial. I recommend the Trimetric 2025RV. For solar or not, see:

Trimetric settings – lessons learned
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Old 09-26-2014, 06:52 PM   #7
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I have one of these. Easily shows battery state, and if not fully charged for some periods of time. Easy to install.

Midnite Solar Battery Monitor
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