SteveP

This is correct. How much passthrough depends on the inverter and not all of them can do it. Assuming you are talking about the sunsynk and deye derivatives, then yes.
This is quite a nice reason to go for the 2x5kw but do remember that the 8kw sunsynk does have higher current ratings on the MPPTs so you can use larger panels without clipping.
In the end I went for the 8kw as it works out cheaper upfront and is a single install rather than having to pay for two installs at different times. 8kw is more than enough for most households and the batteries tend to be more of an issue at the end of the day anyway. For me, the only benefit of the 2x5kw setup is redundancy and that might be a major driving factor for some - even if more expensive overall.
One thing to note is that the 8kw sunsynk/deye has quite loud fans which come on every so often. This is not an issue if you install inside a garage but if installed in earshot, it is irritating. AFAIK the 5kw (and therefore 2x5kw) synsunk/deye inverters do not have this "issue".
Edit: I must add, if you have a few aircons and a pool pump - we have an old school aircon that draws 3kw when running - then the 5kw one is likely not enough. With that said, I have a friend who put his whole house on a 5kw system and has had no issues.

Every inverter type and model has his own way of handling floating charge situation. Some appear weird. Basically higher battery capacity provides more stability thanks to reduced battery voltage drop due to sudden load. I experienced this. After adding a 4th pack floating operation became much more stable and satisfactory.

HA02 with or without Bluetooth. Various sellers. Some are for 2 batteries and others for 4 batteries. 

@Gavin286 possible. Although we are not talking very high loads given that the mppts are rated for 10.4kW.. I guess more testing is needed. With that said, I have not had my system run through a winter cycle so it could very well have something to do with temperatures given how hot it is and the fact that it has only happened to me when running my 30k BTU non-inverter aircon - because it is so hot XD
Edit: I initially suspected the issue was due to the very high inrush current caused by the old aircon toggling on and off during its cooling cycle but again, more testing required.
Speaking to my installer, he said that he has seen a similar thing in a factory that has a large non-inverter aircon on a 12kW sunsynk so theres that..

This is correct. How much passthrough depends on the inverter and not all of them can do it. Assuming you are talking about the sunsynk and deye derivatives, then yes.
This is quite a nice reason to go for the 2x5kw but do remember that the 8kw sunsynk does have higher current ratings on the MPPTs so you can use larger panels without clipping.
In the end I went for the 8kw as it works out cheaper upfront and is a single install rather than having to pay for two installs at different times. 8kw is more than enough for most households and the batteries tend to be more of an issue at the end of the day anyway. For me, the only benefit of the 2x5kw setup is redundancy and that might be a major driving factor for some - even if more expensive overall.
One thing to note is that the 8kw sunsynk/deye has quite loud fans which come on every so often. This is not an issue if you install inside a garage but if installed in earshot, it is irritating. AFAIK the 5kw (and therefore 2x5kw) synsunk/deye inverters do not have this "issue".
Edit: I must add, if you have a few aircons and a pool pump - we have an old school aircon that draws 3kw when running - then the 5kw one is likely not enough. With that said, I have a friend who put his whole house on a 5kw system and has had no issues.

This is correct. How much passthrough depends on the inverter and not all of them can do it. Assuming you are talking about the sunsynk and deye derivatives, then yes.
This is quite a nice reason to go for the 2x5kw but do remember that the 8kw sunsynk does have higher current ratings on the MPPTs so you can use larger panels without clipping.
In the end I went for the 8kw as it works out cheaper upfront and is a single install rather than having to pay for two installs at different times. 8kw is more than enough for most households and the batteries tend to be more of an issue at the end of the day anyway. For me, the only benefit of the 2x5kw setup is redundancy and that might be a major driving factor for some - even if more expensive overall.
One thing to note is that the 8kw sunsynk/deye has quite loud fans which come on every so often. This is not an issue if you install inside a garage but if installed in earshot, it is irritating. AFAIK the 5kw (and therefore 2x5kw) synsunk/deye inverters do not have this "issue".
Edit: I must add, if you have a few aircons and a pool pump - we have an old school aircon that draws 3kw when running - then the 5kw one is likely not enough. With that said, I have a friend who put his whole house on a 5kw system and has had no issues.