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UPS and LiFePo4s
#1
Did anyone test if generally a series of 4 LiFePo4s can be compatible with standard UPS units that use lead acid batteries ?

It could be really useful...

If anyone tried this please share some feedback.
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#2
It works on some UPS systems yes. BUT you need to read the specifications of the ups so it doesnt overcharge your LiFePo4.

LiFePo4 is basically 100% compatible with most LA systems since they are very forgiving. With that said some LA have higher voltage and therefore may trip the BMS.
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#3
I have 4 x APC style UPSs with custom Lithium-ion packs in operation.  2 are the 1500 model and 2 are the 3000 model.  
- 1500(s) range from 27-28v as their top charge - e.g. these are 24v lead acid originally.
- 3000(s) range from 54.3v - 55.4v as their top charge - e.g. these are 48v lead acid originally.

If these voltages work for you - then you might try one.  Used/refurbished are super affordable on ebay and everyone I've bought on ebay has worked.  I've purchased 10 of them over the years Smile
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#4
@OffGridInTheCity are these rackmount (high quality) like these: www.forit.ro/ups-uri/apc/196687-smart-ups-1500va-lcd-rm-2u-230v-smartconnect/ or just standard cheap versions ?
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#5
(07-08-2020, 05:12 AM)Overmind Wrote: @OffGridInTheCity are these rackmount (high quality) like these: www.forit.ro/ups-uri/apc/196687-smart-ups-1500va-lcd-rm-2u-230v-smartconnect/ or just standard cheap versions 
I don't have racks so I went free-standing like the picture below (with APC 3000 + Chargery 16 BMS) - which are more 'consumer' than 'professional' grade.   However, battery wise, I'm guessing they are all 24v or 48v nominal.    @Korishan has pointed out that some models of the professional grade will even let you set things like charge voltage max - but I don't know of a specific model to share.


Here's an example of an APC UPS 1500 (120v@1000w'ish continuous) of which I have 9 Smile.  $85 is pretty cheap!   https://www.ebay.com/itm/APC-Smart-UPS-1...Swbqle-OOE            You can even add an internet card (https://www.ebay.com/itm/APC-AP9631-NMC-...Sw84xezAmE) for these 'Smart APCs' and get power logs every 10min and see status.   I use this to monitor and get power readings but since mine are regular (as apposed to commercial) I can't set very much - just email, and alarm settings, and log rotations - things like that.
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#6
Those are lower quality that the rackmount/server models.
Not sure about the sine-wave quality.
For general use, they should be fine.
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