Use EUC battery for computer backup power spply.

[EUCMania]

Typical computer UPS has a small battery to keep computer up for about 5 minutes. I am thinking if it is possible to use my EUCs' battery as a backup power for computer. Ideas anyone?

[esaj]

15 hours ago, EUCMania said:

Typical computer UPS has a small battery to keep computer up for about 5 minutes. I am thinking if it is possible to use my EUCs' battery as a backup power for computer. Ideas anyone?

You'd likely need a boost-circuit and a sinewave inverter to get 230V/50Hz (or 110V/60Hz in US). Something like this (but I don't know if it's any good, pretty much the first hit from Google)

https://www.aliexpress.com/item/300W-60V-72VDC-100-110-120VAC-or-220-230-240VAC-Pure-Sine-Wave-PV-Inverter-Off/779436715.html

Do check that the input voltages are suitable for the battery voltage range  (about 48-67.2V for 16S, 60-84V for 20S).

Also "something" in-between to detect that the mains AC has gone down and then start using the power from the battery / inverter fast enough so that things don't have time to shut down...

[EUCMania]

2 minutes ago, esaj said:

You'd likely need a boost-circuit and a sinewave inverter to get 230V/50Hz (or 110V/60Hz in US). Something like this (but I don't know if it's any good):

https://www.aliexpress.com/item/300W-60V-72VDC-100-110-120VAC-or-220-230-240VAC-Pure-Sine-Wave-PV-Inverter-Off/779436715.html

 

OK, this is one option. The question is how to connect to the current UPS so that it is turned on automatically when the grid power is off.

Another option is to get a DC to DC step down board to connect to the current lead battery in the UPS. This requires a 67v DC down to 12v DC board with 300w+ power rating. I cannot find it though.