An interesting video and I'm enjoying the conversation related to battery vs panel capacity.
I'm at the planning phase for a grid tied system. One of the questions I've got is the advantages or otherwise of LV battery pack vs a HV pack.
Say I wanted 20 kWh of battery capacity (connected to a 10kW rated hybrid inverter) I can see the following characteristics:
LV: nominal voltage 51.2v, current at 10kW is ~200A. That's a lot to switch.
HV: (4 packs in series) nominal 205v, current at 10kW ~50A which is an easier load for switching and wiring, very common.
I'd be thinking the required cable cross section would be a function of the current so a much thinner cable is possible with the HV option.
10kW is circa 200A vs 100A on my 5kW unit. LV system still very doable at this current.
In this case of my unit you'd connect cables in the opposite corner of the bus bars to level out the current between packs, and use 50mm cable insted of 35mm.
HV gives me the heebie-jeebies.
The AERL 6 unit bus bar is 600A rated. The 10 unit rack bus bar is 1250A rated for example.
I'd only got for HV if I had a long cable run between inverter and pack.
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