ECO-WORTHY US via Ebay [ebay.com] has
ECO-WORTHY 3584Wh 12V/280Ah Smart LiFePO4 Battery w/ Bluetooth Monitoring on sale for $376.45 - 15% w/ code
FIFTEENFORYOU =
$319.99.
Shipping is free.
About this product:
- Bluetooth and remote app monitoring to read the battery voltage, current, battery capacity and other important information
- 200A BMS with multiple protections, including low-temperature protection (charging cut-off 19.4 F)
- Supports up to 4 batteries in parallel, providing 1120Ah at 12V ideal for RVs, or 4 in series ideal for 48V solar power systems
- High-strength metal frame, Grade A cells
- 6000-15000 long life cycles & 10-Year life
- 17.8 x 9.37 x 8.7" (63.93 lbs)
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Our community has rated this post as helpful. If you agree, why not thank natataka
Wonder if this stock was imported before the tariffs, or if the price on cells is just coming down quickly enough to make up for the extra overhead.
It's working very well so far, the only downside is that the automatic transfer feature is relatively slow (I think it's ~30ms to cut over?) which is too long for certain pieces of equipment I have it protecting. If you don't care if something like your network router/wifi/etc. blips, it's probably not even of concern. I do, so my solution was to take the old lead acid UPS this replaced (which would only last 10-15min or so, but cuts over fast enough so everything stays on - this new setup should last around 6 hours at 500w-ish with just one battery) and keep it in-line between the equipment and this setup.
At this $320 price point, I'm considering picking up another battery to expand the capacity, since as you mentioned it's totally a crapshoot where prices might go from here.
It's working very well so far, the only downside is that the automatic transfer feature is relatively slow (I think it's ~30ms to cut over?) which is too long for certain pieces of equipment I have it protecting. If you don't care if something like your network router/wifi/etc. blips, it's probably not even of concern. I do, so my solution was to take the old lead acid UPS this replaced (which would only last 10-15min or so, but cuts over fast enough so everything stays on - this new setup should last around 6 hours at 500w-ish with just one battery) and keep it in-line between the equipment and this setup.
At this $320 price point, I'm considering picking up another battery to expand the capacity, since as you mentioned it's totally a crapshoot where prices might go from here.
I've heard the same about using a UPS/charger designed for lead acid with LiFePO4 batteries, hence the above configuration; there's some batteries out there that say they're tweaked to accommodate that charging behavior (ie they're regular small UPS dimensions & can handle the float voltage/can charge like lead acid) but I didn't feel like taking that kind of chance having seen lithium battery fire videos on YouTube 😅
Also, speaking of battery dimensions - I had it in my brain that this battery would be about the same physical size of a car battery. It's actually more like 2x the size, but comes with convenient carrying straps (it's ~60lb)
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I've heard the same about using a UPS/charger designed for lead acid with LiFePO4 batteries, hence the above configuration; there's some batteries out there that say they're tweaked to accommodate that charging behavior (ie they're regular small UPS dimensions & can handle the float voltage/can charge like lead acid) but I didn't feel like taking that kind of chance having seen lithium battery fire videos on YouTube 😅
Also, speaking of battery dimensions - I had it in my brain that this battery would be about the same physical size of a car battery. It's actually more like 2x the size, but comes with convenient carrying straps (it's ~60lb)
Few points.
LifePO4 chemistry is not prone to thermal runaway. It's simply not a concern.
They are fine to use in place of lead acid batteries, they will only be able to charge to about 90-95% of capacity with a lead acid charging profile. That same profile will also not take advantage of how quickly lithium can charge. The biggest downside will be the BMS- on smaller capacity lithium batteries the BMS is usually pretty weak and limited to 10a-20a discharge rates, which is not much when converted to AC. Lead acid are much better at higher discharge rates, but have a much lower capacity.
As far as this battery, yes it is larger (x2) and heavier (x1.5) than a standard lead acid deep cycle, but it has about 5 times the usable capacity, will last 3-4 times as long and recharges much faster. It's a much better use of limited space... But again for high drain applications, lead acid is usually better.
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