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Re: More low cost Battery Monitors.

PostPosted:Thu Aug 08, 2019 12:07 pm
by Nut17
During testing of our new van installation I used a 2000 watt fan heater to drag the battery bank down - Votronic showing -164 Amps. Ran it for a full hour without anything getting hot or failing and battery cells all staying nice and even under load. ;) :)

Re: More low cost Battery Monitors.

PostPosted:Sun Sep 08, 2019 2:16 pm
by Derb
Hi Fellas. I have spent a day or so rolling around under the bed in the Southern Star having a bit of a tidy-up of the Batteries, Inverter and associated wiring. Is great when you finally borrow a good lug-crimper and a plan comes together. I munted a little finger in the process so typing is a bit frustrating :D . Waaaaay back Neil brought in some Battery Monitors from overseas and I bought one off him. Neddy,s #3 it was. Soooo - I finally fitted up the Shunt (200 amp) whilst completing this project. A good while back I also ran out the wiring through the fridge-cavity to the panel on which I am mounting the Monitor (along with a spare 7-conductor cable for future use). Now I havent got a set of installation/operating instructions for the Monitor :roll: .
Terminals as follows;

+ (Vext) -.......... + (RLY) -.......... Vin.......... SNS.......... AGND.......... GND

That is 8 Terminal connections.

I know all of you technical types are very keen for me to complete the installation of my flash new expensive "Worry-Meter" so I can stop relying on my trusty "Voltmeter" :lol:
Any help much appreciated whilst I have a bit of momentum with this project.
Cheers.

Re: More low cost Battery Monitors.

PostPosted:Sun Sep 08, 2019 3:22 pm
by NeilV
This should help?

Re: More low cost Battery Monitors.

PostPosted:Sun Sep 08, 2019 3:52 pm
by 96coaster
The link below should help. One problem I had was calibration of HIGH current as my multi-meter only reads to 10 amps.


https://www.hisse-et-oh.com/system/asse ... 1411106362

Re: More low cost Battery Monitors.

PostPosted:Sun Sep 08, 2019 4:09 pm
by Karmann57
Neilv's diagram is the one I used, the key is to loop from the Vin to +Vext at the green circuit board, then run your +v feed to the Vin terminal . The rest of the connections are then obvious.

I installed one of these about a year ago and very happy with it. Another trick is to zero the AMPS reading when you know there is no charge or load in/out of the battery by holding the AMPS display button down for a few seconds. This ensures that the A% value does not slowly sink down when it is sitting at float on the mains charger.

P.S. I ran a 4 metre length of 4 core shielded audio cable from the Shunt ( at the battery ) up to the switch panel on the overhead locker , where the "Elite Panel" is located plugged into the back of the Monitor.

P P S and I have not bothered to "calibrate the HIGH current" , don't think it is essential.

Re: More low cost Battery Monitors.

PostPosted:Sun Sep 08, 2019 6:40 pm
by Derb
Cheers Fellas - Just what the Doctor ordered :TU

Re: More low cost Battery Monitors.

PostPosted:Tue Sep 10, 2019 8:24 am
by Derb
Hi Fellas. One thing puzzles me. The 2 GND's to all intents and purposes go to the same position but different terminals on the shunt. What is the purpose of this? Is it not possible to bridge the 2 at the BM itself? Cheers.

Re: More low cost Battery Monitors.

PostPosted:Tue Sep 10, 2019 8:58 am
by Neddy
The thin (blue) wires are the shunt "Sense" leads. You are measuring minute voltages across the shunt and the wires carrying this cannot be shared with anything else at all - not even the meter's own power supply.

Neville.