1kVA - 3kVA Lithium Compatible UPS units

Main problem with lithium is you have to overprovision capacity (or overpay) to have sufficient current draw capability.

So 15 mins @ 1000 W is only 250 Wh or about 20 Ah for a "12 V" battery.

But a standard LiFePO4 is 1C, so you would need 4 in parallel to supply the 1000 W. And now you have 1000 Wh which is overkill.

This plus the shallow/rare cycles makes lead acid still not a bad choice for the application.
 
Tomtomtom said:
Main problem with lithium is you have to overprovision capacity (or overpay) to have sufficient current draw capability.

So 15 mins @ 1000 W is only 250 Wh or about 20 Ah for a "12 V" battery.

But a standard LiFePO4 is 1C, so you would need 4 in parallel to supply the 1000 W. And now you have 1000 Wh which is overkill.

This plus the shallow/rare cycles makes lead acid still not a bad choice for the application.
Click to expand...
many cells can do up to 3c discharge
the bms they are paired with tends to be the limiting factor

and some can even do way higher c ratings
ie these headway high drain cells are fine with pulse up to 30c for 30s and continuous 15c

www.evlithium.com

Headway 38120HP 8Ah LiFePO4 Battery Cell

Headway 15C High Discharge Rate 38120HP 8Ah Lithium Iron Phosphate LiFePO4 cylindrical Battery Cell
www.evlithium.com

so at 15c that is 120a so you can do a peak load of 1536w
with 4 tiny 8ah cells


many normal cells can drain 10c pulse and 3c constant

www.evlithium.com

Headway 38120S 10Ah LiFePO4 Battery Cell

Headway battery -- Headway LiFePO4 38120S cells is 10Ah high power cell--Headway Battery sales partner and technical support specialized center.
www.evlithium.com


budget is where the problems come in people want a Ferrari at a ford price
small batteries are built for budget use with budget fitting bms, many think these battery ratings are what the cell ratings are, when in fact this is just what the bms limits it too
 
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