I have a bmv-712 but it does not show any positive readings when charging the battery. It displays negative readings but I can’t figure out why it does not display positive readings when charging.
Any tips???
asked
BMV-712 Input Detection??
It turns out I had the solar charger connected to the “battery” side of the shunt rather than the “load” side.
This fixed the problem.
I appreciate everyone’s quick response.
Thank you!
Glad you were able to get it working again! The great things about these devices is how simple they are; there are only so many things that can possibly go wrong with them :-D
@Darcy Martin, 99.8% of the time that a BMV isn't showing charge it's because your charger isn't hooked to it. Keep in mind, as stated in the instructions, that one wire should be connected to your battery negative, and that wire goes to the "battery" side of the shunt. ALL other system negatives must be connected to the "load" side of the shunt. That includes chargers, component negatives, chassis grounds, etc. The BMV uses the negative shunt to measure all current in/out of the system, so if your charger is hooked directly to the battery, the BMV can't see it.
Make sure that nothing other than the "battery" side of your shunt is connected to your battery negative post; if you're still having issues after that, post some pictures of your setup and we'll figure it out from there.
No, I'm not trying to be a jerk...
Okay, I've never seen a BMV-712 firsthand, but this sounds like some basic DC voltage troubleshooting. First off, I'll assume that you aren't expecting to see a + symbol to the left of the numeric readout. What is happening when you see the negative (-) readings? Are all the necessary wires connected to the shunt properly? If in doubt, double and triple-check. Check the continuity of your cabling. You can trust, but you must verify. Are you seeing any voltage increases during the charge phases?
Has the unit been synchronized? This is going to be difficult to troubleshoot without more information. What kind of arrangement is this? Solar/generator/alternator involved? We need a wiring diagram. You need to be the eyes for the forum. The more accurate details you can provide, the better. If in doubt, go look, and take some pictures for us.
packrat
Something else came to mind. Did you need to, or have you calibrated the zero current setting? Refer to the manual for a better explanation than I can provide at the moment.
packrat
i Will look into this as well as I have not done a zero calibration.
