Parallel Inverter Data
Hi all,
I have had a 3.6kw ECCO installed for a year and have now added the 8.8kw big brother next to it.
I've wired them in parallel as per the manual and set one as master and one as slave.
My question is about calculating total grid/load/battery input and output.
Am I right in thinking that the value shown on each inverter should be added together to calculate the value?
i.e. if each inverter shows the non-essential load is drawing 200w, then the actual power bring drawn by the load is 400W.
Other than the slave seeing the CT clamp value and the BMS data via the parallel connection, what other data is actually communicated between the inverters? I did expect the 'master' inverter to be able to show me the total power drawn by the loads no only what that inverter is producing.
Similar question about the system settings and grid charge schedule. If I set the master inverter to charge the battery from the grid between certain hours, does the slave automatically follow the same schedule or does it need programming independently?
thanks for thall the help!
Best Wishes
Richard
Thanks again for all the discussion.
Sunsynk support replied confirming that paralleling non-identical inverters is not possible as they use different firmware/software. Personally I am struggling to see how different their firmwares can be considering that the operate in identical manners, and this seems more of a feature limitation that technical incompatibility.
Support did say that I ccan run both inverters on the same grid but not in parallel:
"you can run both inverters side by side independently but only the larger inverter would use the CT coil because they would conflict with each other and the smaller inverter can not have any batteries attached to it as the CT coil will see that as a load , therefore this is something that can be done but is not advised as it not a good way to use the system"
I claified with them that this is a safe and warrenty-approved way to use the hardware, just not as efficient. It must also mean that the smaller inverter will not trip (in response to sean.moss comment)?
I will explore options for using the 3.6kw as a gen input to the 8.8, or using independently as described above - all whilst saving pennies for another 8.8kw it seems!
On that note - where is the best place to buy sunsynk equipment in the UK? Can you order direct from Sunsynk (as suggested in my 'profile') or should I just pick one up from the cheapest website I can find?
Best Wishes
Richard