| > I have to admit that I really dislike using ~12V batteries for high power applications like this. I say this having built a ~400A ~14V system. It’s miserable. The schematic looks to be pretty adaptable to higher driving voltage, just need separate 12V for control board. There is even one in datasheet for 24-36V operation >2: batteries with microinverters and a civilized way to share current. A manufacturer could make a single package with a 1kWh battery, a BMS, a low voltage, low current DC auxiliary output, and a ground-fault and overcurrent-protected 110-250V AC input/output. And an RS485 or 10BASE-T1S or CAN connection so that they can coordinate their I-V characteristics to appropriate distribute charge or discharge current. > Now you can connect as many microinverter-batteries as you like in parallel, using #14 wire, to one ordinary circuit breaker per battery plus (depending on the overall arrangement) one big breaker to protect the common bus. You can build it right now. AC coupled batteries exist; here is some random one that scales up: https://www.fortresspower.com/ac-coupled/ The problem is that you generally want batteries when you want renewables and in that case just having one big box handling batteries and solar panels is more economical than microinverters everywhere 48V battery pack + BMS is significantly cheaper than same thing with microinverter, and when you scale up one big inverter is cheaper than a bunch of smaller ones. So yeah, it is "best" but also most expensive way. And frankly, the hardest to develop, which is probably why there is little to no open designs for that. |