Has anyone tried replacing the sealed lead acid batteries in a UPS, APC or Cyberpower using a Lithium Ion battery? I keep seeig adds for this battery today. https://www.expertpower.us/products/ep1210-10ah I know that LiFePO4 batteries can handle a higher charging voltage but I don't see how a lower charge voltage woud hurt anything in a standby application.
LiFePO4 Batteries in UPS?
- Thread starter Astro_Guy
- Start date
That label reads charging voltage 14.4 standby 13.8. As long as your UPS regularly delivers within that range (and hopefully slightly under the peak) it should work fine, if not better than the lead acid it came with. If it goes over, it gets ugly, as the BMS will repeatedly disconnect and reconnect its internal breaker.
I have LifePO4+ at my off grid cabin and they're the cat's meow. They don't get much voltage sag even with a substantial draw and when being nearly discharged.
I got 100 Ah batteries for just under $100, for what it's worth, so $60 for 1/10 the capacity is a bit much, unless you like the form factor and want the cover to fit back on.
IMO the best solution would be to get a UPS designed for and containing a LifePO4+ battery from the get-go, that way its charging profile will match.
I have LifePO4+ at my off grid cabin and they're the cat's meow. They don't get much voltage sag even with a substantial draw and when being nearly discharged.
I got 100 Ah batteries for just under $100, for what it's worth, so $60 for 1/10 the capacity is a bit much, unless you like the form factor and want the cover to fit back on.
IMO the best solution would be to get a UPS designed for and containing a LifePO4+ battery from the get-go, that way its charging profile will match.
I was shopping for SLA batteries in the form factor common to small UPS systems and now this company's adds are following me everywhere I go. They sell the sealed lead acid 9 Ah battery for $24 which I think is par for the course. In any event there may be a cheaper option in LiFePO4. Presently I have two Cyberpower 1350 VA units in need of batteries and they each take two.I got 100 Ah batteries for just under $100, for what it's worth, so $60 for 1/10 the capacity is a bit much, unless you like the form factor and want the cover to fit back on.
Is your off grid system 12 volts or 48?
48, total 8 batteries. Just a hair over 10KWh.
How many watts of panels are feeding that power tank? Microinverters or string inverter?
Here is an option at half the price but the offer seems suspicious. https://www.temu.com/12v-10ah-lithi...finder-built-in-10a-bms-g-601103914035014.htm
910 was the most I ever saw, on a nice bright winter day. Typical is 400-450. Since the place is a weekend getaway, it has a full week to recharge. Does so in 2.5 days per the logs. Panels are old and mismatched. Place is a livable project.
The system is from circa 2000, with "Outback" brand charge controller and inverter. It was set up for lead acid but I changed the peak and float voltage settings to match LifePO4+. "They" say you shouldn't do it this way but I get the full capacity of the batteries. I use my Prius Prime as a calibrated discharge.
And I got all my batteries from Temu. They're about 20% more expensive on eBay and Amazon. I'd have no qualms about buying a premade LifePO4+ battery with BMS from Temu. Only that chemistry, and only with BMS. Most other lithium chemistries are sketchy and dangerous.
If the charging circuit of the UPS never hits the voltage necessary to fully charge LFP cells, the cells in the battery will never top balance. The problem with that is the cells' individual voltage starts to drift apart, so you end up with some cells doing more work than others, which means a shorter overall battery life.
Unlike lead-based chemistry, LFP isn't ideal for applications where the battery is held at a near-full state of charge most of the time, such as in the case of a UPS.
Unlike lead-based chemistry, LFP isn't ideal for applications where the battery is held at a near-full state of charge most of the time, such as in the case of a UPS.
There is crossover function happening now. The sine-wave “inverter/chargers” on Amazon have priority modes which allow one to configure them as an ups, with configurable battery types. A couple of LiFEPo4 batteries and one of these can build a stout UPS, or perhaps even one of the jackery or bluetti type battery units would do the job.
I recently built a 100AH 24v pack with 1200 watt inverter and the LiFEPo4 technology is superb. All my future use is likely to go here and walk away from lead/acid. I used wattcycle branded batteries and am quite pleased.
I recently built a 100AH 24v pack with 1200 watt inverter and the LiFEPo4 technology is superb. All my future use is likely to go here and walk away from lead/acid. I used wattcycle branded batteries and am quite pleased.
Pretty much every LiFePO4 battery will have it's own internal BMS to handle charging and cell balancing. So don't think that's really an issue. What I have found though is lithium doesn't have near the safe discharge rate as compared to SLA. Total energy density may be about equivalent but peak output + safe discharge current is ~1/3 of SLA. Most sellers for LiFePO4 UPS type batteries (assuming typical 12V/8Ah) state not to exceed 5A to prevent cell damage. Equating to roughly 65W load output. While sufficient for a modern home office PC, would be exceeding it's rating if supporting a gaming rig.
I’ve posted this before on a different thread.
DJI Power 1000 v2. $364 for 1024Wh.
A power station has a battery, a charger, an inverter, a quick changeover from line to inverter, is efficient when running on battery, and reasonably quiet.
I’ve gone with this when I needed to replace a SLA UPS. Lots more energy.
There are environments (like extremely frequent voltage sags) where an UPS is the way to go. But for my environment I need standby power for 1 to 12 hours.
DJI Power 1000 v2. $364 for 1024Wh.
A power station has a battery, a charger, an inverter, a quick changeover from line to inverter, is efficient when running on battery, and reasonably quiet.
I’ve gone with this when I needed to replace a SLA UPS. Lots more energy.
There are environments (like extremely frequent voltage sags) where an UPS is the way to go. But for my environment I need standby power for 1 to 12 hours.
OVERKILL
$100 Site Donor 2021
Some of the reviews make it sound like a fire hazard...
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