question

I know you mentioned there being no other loads connected. To be clear for anyone else that might find this issue, it's also possible that other chargers could be connected and they too would need to be disconnected for the BMV and controller to match.

Depending on the android device and quality of bluetooth connectivity there can be a delay or stutter in what is displayed. It might be helpful to use the "Trends" tab. Does it reliably show a graph that updates every second?

Do the controller voltages match that of the BMV? If not, how far off are they?

@Robin, how are you connecting both a VE.Direct to USB Adapter and a VE.Direct Bluetooth dongle to the same MPPT simultaneously?

My thought is that if you're using some kind of "y" adapter, then the fault may well be in the adapter rather than the attached components. If, on the other hand, the USB adapter is connected to one of the components and the Bluetooth dongle is attached to the other, then that's not a valid comparison of actual accessory components.

My other question is whether or not you have fully updated the F/W in all devices... The BT dongle has F/W that needs updating, as does the MPPT and the BMV. The BMV appears accurate (as it should be), and Johannes is absolutely correct in that the MPPT's internal measurements are not as accurate as the BMV's, but this degree of discrepancy -if it is indeed as it appears- is most likely a F/W issue rather than a hardware issue.

Thanks for input.

I am not using smart dongle and usb together. I have to replace one with the other.

Firmware is all updated by victron connect and i supplied victron with all serial numbers and firmware versions.

The dongle did go throw a firmware update

As to the lag i had considered this but what is happening, the bluetooth smart dongle is displaying consistently higher amperage readings getting further apart the higher the currant. Not actually lagging behind.

As for the mppt not being accurate to be 4.5 amps out at a 19.5 amps is excessive. However the reading is bang on when viewed via the usb connection so the mppt is correct. It seems to be some issue withe the smart dongle or compatibility between the dongle and mppt

@Robin, based on the assumption that the screenshots posted are accurate reflections of what you're observing in situ, I would contact the distributor from whom you purchased the BT dongle and start a warranty exchange. I'm the tech support manager for a distributor and although I've never seen this behavior before, I can definitely say that it is atypical... a slight discrepancy between the MPPT and the BMV is to be expected, but not a discrepancy between the readings given through VE.Direct to USB vs. VE.Direct to BT... both devices are using the exact same interface, they're just doing different things with it, so both should be giving you the same readings. Again, I've never seen it before, but my best guess is that either one of the little VE.Direct pin inputs on the BT dongle is fouled/defective or that there's a defect in the dongle's PCB or the wiring to it from the VE.Direct plug.

In any case, this is not typical behavior of the dongle, and as such should give you no issues in getting a warranty replacement from the distributor. Each distributor has their own protocol to follow in dealing with warranty returns, so I can't say what your particular process will be, but it definitely qualifies for it.