LiFePO4 vs Lead Acid Efficiency

garo

This thread is inspired as a spin off from comments in the Shadey Solar Quotes thread


Worth a thread of it's Own I expect;

garo wrote: »

Your man got 77% efficiency off lead-acid not including inverter losses:
https://www.navitron.org.uk/forum/index.php?topic=1847.0


LiFePO4 losses are less than half that. So your 1>2% number is way off.

Yer man is not me Garo. Question the methd, test accuracy, hardware and lead health to begin with.


I've LifePO4 efficiency results of 98% and SLA of ~95% The system efficiency losses are mostly the transformer and mosFETs involved.


I'll start posting my results as I get them.
I know right the internet accuses lead as being 80% efficient...I don't know how they're generating results so bad..to sell li-ion maybe?. Most of it is unfounded echo chamber.

@24V)

This is a Yuasa SLA






Total Effective Capacity (@24V)
I removed 52.2Ah @ C10








Returned (including active cooling consumption)

Typical Flooded Lead Acid overcharge expressed as a percentage on the only SOC meter in production that displays >100% Charge (what an invaluable feature)

1.2kVA 1kWh LiFePO4 system round trip




Charge returned

of 100Ah removed No photo but this is the battery meter it was read from

That's the state of the Art >€6k 4kVA 3kWh mostly solid state system I was refering to earlier (in other thread)
System data info not battery. I can rerun the test.

I have a sister lead version for this that cost me ~€1k; 3.5kVA 10kWh that I'll be running cycle tests on soon so I will post the results when they are in.

garo

garo wrote: »

LiFePO4 losses are less than half that. So your 1>2% number is way off.

As with most rebuttals I could simply ask; Have you any evidence to support that?

Here's a 1.3kvA 1.1Kwh Lead acid set. Sister to the little LiFePO4 I have.

You'll notice a higher round trip efficiency I expect.



Energy Out




Energy In (test ended at 95% SOC)