Some pictures of the equipment:
5kW, 10kW peak Reliable Electric inverter. No frills, but can apparently handle 4.5kW straight for hours based on my initial test. The fans are temperature driven, not load driven, so it's also a very quiet unit at low loads. Can't wait to push this thing to see what it can handle - I've tested with some basic inductive loads and it handles those just fine.
The sine wave looks good, even at high load. Ignore the peak-to-peak value below, it is higher but that scope is a bit off. It's closer to 320V as it should be, being this is an inverter configured to 230V RMS.
The BMS is compact and feels very robust, encased in metal all the way. Proper copper leads, two external temperature sensors. It supports low and high temp cut-off. Of course, 'manual' is lacking, so just for reference: it won't turn on until you put a charger on it (voltage applied needs to be higher than the battery voltage), the Bluetooth pairing code is '1234' and the pin code to make changes to the BMS values is '123456'.
Screenshot of the app. I just put a quick 16 cell pack together, so ignore things like wire resistances and remaining capacity etc. The voltages are looking good, and the integrated balancing seems to work very well. This is the 100A discharge current with 0.6A balancing current version I got to test and play with. If this thing works properly, I'll get the one with 300A discharge current with 2A balancing current version.
Finally, the charge controllers. They feel very robust, and they are pretty small. This one should be able to push 100A, so I got two - one for each 5kW part of the solar array. Its downside is that it only handles up to 145V on the input, so I'm only putting two panels in series. I've not tested this one yet except powering it on. Solar panels should arrive next week and then I'll make a proper installation.
First impressions on everything: this could actually work