question

Grant Willson avatar image

My Phoenix inverter 12V 250VA 230V sometimes shows negative output current in VRM

"inverter output voltage and current" readings on the Advanced page of VRM go negative output current (-0.2 for example), sometimes, while it is actively powering a load (tv, phone, computer).

Remote Console shows 0VA but theres 17watts being used as shown by my Smart Plug.

Surely it's impossible for the inverter to do that (negative current).

Phoenix InverterVE.Direct
2 |3000 characters needed characters left characters exceeded

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

2 Answers
Guy Stewart (Victron Community Manager) avatar image
Guy Stewart (Victron Community Manager) answered ·

Electricity is a funny thing, and nothing is impossible. But in this case it is much more likely that the current reading component on those inverters is not precise, just an indication.

For a more precise and accurate reading, it is strongly recommended to use the SmartShunt or BMV-712.

2 |3000 characters needed characters left characters exceeded

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

Grant Willson avatar image
Grant Willson answered ·

Oh, sure, I've got the BMV-712 too.

Obviously the Phoenix Inverter current calculation components are not accurate. Disappointing.

But I would expect that at least the software would impose a floor value of Zero Amps because the design of the hardware makes negative current production impossible, presumably.

2 |3000 characters needed characters left characters exceeded

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.