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Modifying UPS Systems

V

VRT

Limp Gawd
Joined
Jul 15, 2016
Messages
460
Has anyone modified UPS systems to use Lithium-Ion batteries? It isn't a certainty but it is looking like I may end up with a truck load of them shortly, I was thinking about modifying a medium sized UPS that I have in storage and using solar to power the system at my off grid cabin. I currently have a very small solar system, but having a larger one where I could run AC etc would make it so I would be there more.

Thanks
 
The main issue isn't feeding the UPS but making sure the LI batteries don't get overcharged. The typical lead acid gel cell UPS battery is very tolerant of overcharging and overheating while managing to not blow up. Not so much for LI type batteries. Most UPS won't include the proper circuitry to safely handle LI batteries.

Suggest you search for articles on folks using used Prius batteries for solar setups. The solutions they have for handling safe charging should apply fairly well to your possible setup.
 
generally speaking I haven't found the inverters in UPS's to be reliable for long term operation. If you want an inverter that will last in that scenario there are some decent priced units out of China, just have to do a little homework. The only real mod I've made to UPS's that have stood the test of time are just extending the battery banks with same type bats.
 
There's a reason that most large scale operations use lead acid batteries and its not because of cost. Li-Ion batteries are very intolerant of operating out of spec and fail spectacularly. They also cant handle being discharged past 50% too many times, unlike lead acid who can be setup for deep cycling over and over with minimal wear. Li-Ion is great for high density energy storage at minimal weight and high (dis)charge rates but they require expensive electronics to ensure its done safely.
 
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