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Old 12-31-2015, 01:19 PM   #1
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Inexpensive Battery Monitor -entry Level

You do not need SOLAR for this product.

A lot of the members are interested in monitoring their battery performance (or lack of), but do not want to invest a lot of money and time into an expensive system. So enter a product that I just found on AMAZON (of course) and it will meet your basic battery monitoring needs for only $17.98.

The order comes with an EASY TO READ DISPLAY (yes you can turn it on/off) and a 100Amp shunt resistor. All you add is the wire (telephone quad wire, or Cat5) between the display/battery/shunt. You will also need to install the shunt resistor between the battery and the frame connections.

I did a temporary install just to test it out and believe it or not it is very accurate. My unit was 0.01 volts off from my volt/ohm meter and the MPPT SOLAR charge controller output. I was impressed. I may mount it on my SOLAR Charge Controller board, for a quick glance at the system. Maybe not, it is easier to pull out my smart phone and check the system.. I will figure out a use for it. Attached a picture of it wired into the TT.

Yes it can be reset. The display is a solid blue color, but the reflection of light distorted the camera shot.

Don
Attached Thumbnails
BATTERY - AMP-Voltge Digital Display - Inexpensive.jpg   BATTERY - AMP-Voltge Digital Display - AMAZON Picture.jpg  
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Old 12-31-2015, 02:13 PM   #2
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Sweet!

I just added it to my Amazon Cart.

Thanks
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Old 12-31-2015, 02:37 PM   #3
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Awesome! Thank you.
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Old 12-31-2015, 03:03 PM   #4
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That`s in my price range!
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Old 12-31-2015, 03:16 PM   #5
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Don:
I have no solar... yet or generator... yet, but I'd like to monitor the batteries and the current when charging...(connected to shore power) and discharging (boondocking). I've been monitoring the system/battery voltage using a voltmeter plugged into the TT 12v outlet.

(Edit: Never Mind. It DOES MATTER... Does it look to you that the shunt will measure current while charging and discharging without changing the wiring? If the shunt is determining current by actually measuring voltage drop, it seems to me it would be OK whether current is flowing into or out of the batteries.Please disregard.)

Yes, I'm in the a 'little knowledge is dangerous' group and have learned that
'for every problem, there is an answer that is quick, simple, and wrong.'
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Old 12-31-2015, 06:50 PM   #6
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Quote:
Originally Posted by oldmanAZ View Post

(Edit: Never Mind. It DOES MATTER... Does it look to you that the shunt will measure current while charging and discharging without changing the wiring? If the shunt is determining current by actually measuring voltage drop, it seems to me it would be OK whether current is flowing into or out of the batteries.Please disregard.)
Yes it does matter. I was looking at it from the "LOAD" side of the circuit, to measure how much the battery(s) have been discharged. You can monitor the voltage level on the display for charging voltages by reversing the shunt leads from the Digital Display.

If you are interested in looking at the battery status in both charging or discharging modes, there is an easy fix. Wire the load/battery display connections that connect to the shunt to a DPDT (Double Throw-Double Pole) switch and manually switch it when you are charging or discharging. This will change the display from one mode to the other. You could mount the DPDT switch right next to where you mount the Digital Display.

I can give you a circuit that will automatically switch between charge/load by using a relay, but it involves activating the relay with 110VAC shore power. If there is 110VAC from shore-power the display will show charging, no 110VAC will show discharging. I would not recommend this option unless you have a background working with 110VAC.

Attached is the DPDT wiring diagram... that is the easy one.

Don
Attached Thumbnails
BATTERY - AMP-Voltge Digital Display - Diagram.jpg  
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2013 Jayco Eagle 284BHS
250Watt Grape Solar Panel, MorningStar MPPT 60 Charge Controller
1500 Watt Ramsond PSI, 2 Trojan T145 Batteries (260Ah)
2 - AirSight Wireless IP Cameras (used as rear view cameras)
EnGenius WI-FI extender, D-Link wireless (n) modem
MagicJack Internet Phone
2012 Ford F150XLT, EcoBoost w/3.73
157" Wheel base, HD Towing Package

Our Solar Album http://www.jaycoowners.com/album.php?albumid=329
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Old 12-31-2015, 08:37 PM   #7
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Thanks Mustang65. I just ordered it from Amazon.
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Old 12-31-2015, 09:05 PM   #8
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Thanks, Don.

When I get my trailer home (it's at the dealer now for warranty & other stuff) and the weather warms up a tad, I'll be in touch regarding this mod. This meter seems to be a good place to start.
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Old 12-31-2015, 09:18 PM   #9
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Wow, what a great price! Been eyeballing these things for years but they've been way too expensive. Just ordered one. Thanks Mustang!!
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Old 01-02-2016, 08:57 AM   #10
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Don did you ask Amazon for a commission yet? <grin>
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