If I remember correctly you have whole house backup, if so you need the second inverter to be controlled by the first inverter. Say the grid goes down, both inverters carry on generating power, the batteries fill up, the inverter throttles back, but the other inverting carries on generating power, what happens?
In my system the Victron will alter the frequency, its called frequency shifting and my SE inverter will stop producing power, and the Victron throttles back just enough to cover loads.
So you need to make sure whatever you have will do this.
Also the first inverter needs to be able to take excess power from the other inverter and charge the batteries.
Probably the easiest way is to use the same make of inverter, so long as they play nice together, including the above, and also with data collection.
You'd also need to do a G99 with the DNO for the increase in generation power.
Will the town house shade the panels in the winter months?
Thanks Ron, yes that was all pretty much my understanding.
I have seen loads of Solax installs with multiple inverters. But no way to know if that includes house backup. They look simpler in the pictures.
I was planning to look at what the "extra boxes" do. They do a number of additional boxes that allow expansion of various parts of the system so assumed there is probably one that will cover this.
I am not playing fully yet however since my batteries again look to be an issue. I am convinced its an issue, maybe something messed up in firmware or just poor QC and quality in general.
I am convinced the "others don't have you issues" is really "others just assume they work as advertised"
Going to dump the batteries, probably tonight, and do a full charge from grid from 10% SOC.
I had another thought. We have only been focussing on the battery charging aspect, ie the charge taken in from 10% to 100% SOC. Thats impossible to perfectly demonstrate since I have some house baseload, and the SOLAX monitoring is 5 minute intervals and seems to be spot values as opposed to average values.
So I am going to do a full charge. But realised if I isolate the solar, I can do a full discharge as well. IE I can allow the batteries only to power the house. With no PV then the total yield will display what the batteries delivered to the house.
Need to find a day with good late afternoon solar prediction. So I can run the batteries down from 100% during the day, but have a chance of topping some decent amounts back up from PV after that has been completed.
I realised I missed a trick. I get on pretty well with the spark who keeps coming round. I should have asked him if he will do some solar himself, I suspect he would from conversation.
Darn it.
You can query that via rest as well but the decoding is a bit of a pain!
