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Re: EQ4800-L9 capacity mismatch: 41.9 kWh capacity but measured ~37 kWh
Posted: Wed Apr 08, 2026 10:54 am
by TheRoseManCanberra
I'm in Canberra and this worries me, i wish i'd known about this before i bought a L9 in January, i would have gone elsewhere.
Re: EQ4800-L9 capacity mismatch: 41.9 kWh capacity but measured ~37 kWh
Posted: Mon Apr 27, 2026 12:31 pm
by QLDuser
Do you guys realise that it is battery preservation issue? Best practice recommends that lithium batteries are cycled within certain limits to preserve better lifespan. Cycling from 10-100% gives it a certain lifespan which I think is what FoxESS estimates, ie 6000 cycles before dropping to 70% efficiency. Of course many other factors impact upon its lifespan such as temperature and how fast the battery is charged or discharged etc. Dropping to 0% battery will bring on faster deterioration. Ideal recommendation is actually to cycle between 20-80%.
For good explanation on FoxESS see
https://www.solarwind.net.au/extending- ... -warranty/
Re: EQ4800-L9 capacity mismatch: 41.9 kWh capacity but measured ~37 kWh
Posted: Mon Apr 27, 2026 9:26 pm
by Beno62
QLDuser wrote: ↑Mon Apr 27, 2026 12:31 pm
Do you guys realise that it is battery preservation issue? Best practice recommends that lithium batteries are cycled within certain limits to preserve better lifespan. Cycling from 10-100% gives it a certain lifespan which I think is what FoxESS estimates, ie 6000 cycles before dropping to 70% efficiency. Of course many other factors impact upon its lifespan such as temperature and how fast the battery is charged or discharged etc. Dropping to 0% battery will bring on faster deterioration. Ideal recommendation is actually to cycle between 20-80%.
For good explanation on FoxESS see
https://www.solarwind.net.au/extending- ... -warranty/
Not very relevant to the thread.
Re: EQ4800-L9 capacity mismatch: 41.9 kWh capacity but measured ~37 kWh
Posted: Tue Apr 28, 2026 6:03 am
by QLDuser
I was suggesting that you can only access 90% of capacity because the last 10% is to protect health of battery.