Hi,
I recently installed an OEM-branded Voltronic Axpert MAX 7200 inverter, together with 2x Pylontech US3000C battery packs.
To start off, I'm not quite sure what category this inverter fits into: I believe it's technically an off-grid inverter which can also draw power from the net, so perhaps hybrid is the right term for it. Compared to other machines, it can also work without an accumulator so that makes it even more special I believe.
At any rate, I've been trying to understand the basic working modes and the functioning logic governing them, but I'm still a bit puzzled so I hope someone can shed some light as to why I'm seeing the non-obvious behaviors listed below. So here it goes:
1) On the first couple of days I did not install the batteries just yet. As I came to discover, the inverter was working fine in bypass mode, drawing energy from the solar panels and the network alike. The only weird thing I noticed was that at times my external CT clamp was reporting some power (a few hundred watts) being injected into the input grid.
My assumption was that in bypass mode and lacking an accumulator, the inverter needed some buffer to absorb fluctuations in consumption and the public network was the only way to achieve that. So is my assumption correct? Is that expected in such a setup? Most of all, could that be illegal in some countries?
2) On the following days I connected the battery packs, too. I was still struggling to understand the various settings so I'm not entirely sure what setup I was working with. However, I was still seeing some power being occasionally pushed to the grid. I fail to understand why that could be the case.
3) After a few more days I settled with what I now think is the final setup. As I was not getting any usable information out of WatchPower, I decided to got for solar assistant. What I now find very awkward is that if I switch to Solar-Utility-Battery priority with the batteries fully charged (100%), the inverter stops drawing power from PV and it only takes it (all) from grid, no matter how much power is potentially available from PV. With batteries charged at 95% everything works as expected: all available power is drawn from PV and the rest (if needed) comes from the grid. Same thing apparently happens if I power off the battery packs.
So it's as if a fully charged battery means: "don't you dare ever thinking about pushing any power this way, for crying out loud!"
So, having said all the above... what basic concept am I missing here?
Thank you in advance!
I recently installed an OEM-branded Voltronic Axpert MAX 7200 inverter, together with 2x Pylontech US3000C battery packs.
To start off, I'm not quite sure what category this inverter fits into: I believe it's technically an off-grid inverter which can also draw power from the net, so perhaps hybrid is the right term for it. Compared to other machines, it can also work without an accumulator so that makes it even more special I believe.
At any rate, I've been trying to understand the basic working modes and the functioning logic governing them, but I'm still a bit puzzled so I hope someone can shed some light as to why I'm seeing the non-obvious behaviors listed below. So here it goes:
1) On the first couple of days I did not install the batteries just yet. As I came to discover, the inverter was working fine in bypass mode, drawing energy from the solar panels and the network alike. The only weird thing I noticed was that at times my external CT clamp was reporting some power (a few hundred watts) being injected into the input grid.
My assumption was that in bypass mode and lacking an accumulator, the inverter needed some buffer to absorb fluctuations in consumption and the public network was the only way to achieve that. So is my assumption correct? Is that expected in such a setup? Most of all, could that be illegal in some countries?
2) On the following days I connected the battery packs, too. I was still struggling to understand the various settings so I'm not entirely sure what setup I was working with. However, I was still seeing some power being occasionally pushed to the grid. I fail to understand why that could be the case.
3) After a few more days I settled with what I now think is the final setup. As I was not getting any usable information out of WatchPower, I decided to got for solar assistant. What I now find very awkward is that if I switch to Solar-Utility-Battery priority with the batteries fully charged (100%), the inverter stops drawing power from PV and it only takes it (all) from grid, no matter how much power is potentially available from PV. With batteries charged at 95% everything works as expected: all available power is drawn from PV and the rest (if needed) comes from the grid. Same thing apparently happens if I power off the battery packs.
So it's as if a fully charged battery means: "don't you dare ever thinking about pushing any power this way, for crying out loud!"
So, having said all the above... what basic concept am I missing here?
Thank you in advance!
