Renogy 500A monitor not registering alternator charge

Hi All,

Firstly this is my first post, but I decided to skip the newbie corner and jump straight into the ddep end:

So I have a Renogy system; 2x100aH batteries, 50A DC-DC charger, 2000w Inverter charger & 300W solar in my van.

The issue with my 500A Battery Monitor is that it registers current & therefore charge percentage for loads, solar charging and AC hookup charging, but not charge from the starter battery.

I am sure current is going in as a) the app tells me it is b) after a 2hr drive the voltage had jumped from 13.2v to 14.1v when i stopped.
I’m at a loss because I believe it is wired correclty:
Any thoughts would be greatly appreciated!

@Monarch_of_the_Glen I had this problem after wiring my battery monitor into my system…it turned out that I had not connected the negative wire from the DC-DC charger to the “Load” connection on my shunt.

I hope this helps.

Hi Wey,
Thanks for the response.
What do you mean by the load connection? Is this not the P- connection that is running from my busbar and then in turn onto the DC charger?

I had what I thought was a breakthrough yesterday, in realising the battery was grounded on the other side of the shunt, which could’ve been stopping the reading, but I just dug out where the ground connection was made… and the geniuses have screwed the ground wires into a painted hole… one step forward, two steps back.!

I’m not sure if they’re all marked in the same way, but my shunt resistor is marked with “Battery -” which connects with one heavy duty wire, to the battery, and “Load -” to which all of the negative services and/or busbar (including the negative charging wire from the DC-DC charger) is connected to.

I made the mistake of connecting the DC-DC negative wire to the battery side of the shunt instead of the load side, which meant the shunt couldn’t measure the amount of charge current into the battery!