https://onestepoffthegrid.com.au/australian-start-up-launches-new-home-battery/
Australian start-up launches its first dedicated small-scale residential battery, a 48V 5.12kWh battery that can be easily stacked to increase capacity.
The working temperature says -20C to 55C. That just seems to be what they've quoted the lifespan under.
The battery is 48V DC. It uses an inverter to produce 240V AC, similar to solar installations.
Yeah, but does that mean a 48V 5.12kWh would be (roughly) equivalent to a 240V 1 kWh battery?
Sorry, I'm only kinda familiar with power tools and bikes etc where the motor/output is rated the same as the battery itself....
meh, I guess the volts don't matter. All the other batteries are rated at Ah, not kWh....
5.12kW is 5.12kW no matter what the voltage is. I think you might be confusing current (amps) with power (watts).
P = IV
P = power
I = current
V = potential difference (voltage)
so 5.12*10^3 W / 240V = 2133.33A ---> 2.13 kAh
vs
5.12*10^3 W / 48V = 10666.67A ---> 10.67 kAh
so yes, it will last longer at 48V but calling it 5.12kWh is not misleading
Yeah, thanks. I kinda figured it out that I was confusing the other batteries being rated at Ah, not kWh.
But I appreciate you spending the time to set it out clearly.
Have a good one.
48V DC is the standard voltage in a bunch of industrial applications. At work I’ve installed sites with over 300kWh of storage, all at 48VDC. Back in the day it was strings of 24x 2V lead-acid batteries. Recently the industry is moving towards cells with 14x - 16x lithium cells, depending on the exact lithium chemistry.
You need an inverter to go from DC to AC anyway, changing the voltage at the same time doesn’t add much to the complexity. Some systems use 400V, but the actually batteries those systems use are usually 8x 48V batteries connected in series.
Australia already has these guys making zinc-bromine flow batteries. It’s awesome to see more.