*BLOATED/UNBALANCED* BYD 24v 8s Lifepo4 3kWh BLOWOUT!
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*These are the same exact BYD modules that we previously had in stock, but the cells have more bloating/swelling than usual and they are a little out of balance. One or two sides of the case may be a little cracked or expanded. These cracks also could have been cause from handling. Either way the green straps are still in tact for compression. They are still showing good voltage, have no dead cells, and are not leaking. At $150 per module you can't go wrong. We recommend adding a balancer and then keeping the cells between 3.00v and 3.4v. They will be easier to stay balanced this way.
THESE ARE SOLD AS IS. NO RETURNS.
We are guaranteeing NO DEAD CELLS and pricing these at absolute rock bottom prices. 24v lifepo4 in 8s configuration has a lot of life left for energy storage applications. If you get a module that tests 4 kWh that's a bonus. But we are pricing these as if every module was 50% of original capacity.
Check the discharge graph from our testing in the 2nd photo. Most of our tests were around the 3kWh mark as you can see in the test results but some were higher. Large lifepo4 modules are hard to keep in balance blow 3v per cell and above 3.4v per cell. Set your charge to 27v, discharge cutoff to 24v, and you will be very happy with the performance. Ride that discharge curve line and get very extended cycle life out of these. We check to make sure every cell has voltage, some cells may be low voltage but they still hold charge. These are not self discharging because these modules have been in storage for 2 years. If they were self discharging the cells would be 0v. These just were discharged to BMS cutoff and left to sit so some cells that were out of balance before are likely lower voltage than the rest. Often times when you recharge the cells balance again near 3.3v. We are not guaranteeing capacity but we tested a lot of these and realistic expectations are between 2.75-3.75 kWh out of the original 5.2kWh. We've priced these around $50/kWh so worse case scenario its still an amazing deal.
These came out of a solar field installation and the batteries were kept in a temperature monitored container. Do not cut the green straps or try to reassemble these. You can convert them into 12v modules by cutting the busbar between the 4th and 5th cell with a dremel and cutting wheel but don't remove the cells from the enclosure. The green straps are structurally applying compression to the cells and cells are showing some bloating which is normal when lifepo4 batteries age. These cells are designed to need compression and cutting those straps will cause the cells to expand even more.
We recommend the ISDT Q8 balance charger, its cheap and works amazing for this pack. Also you can easily add a Daly 8s lifepo4 BMS to this. The battery does not come with a BMS but the wiring is there and the sides pop out for easy access. The main positive and negative posts are easily accessible. You can always cut the posts, drill a hole in the main busbar leads, and simply add a nut and bolt. These are super easy to work on. No soldering needed to add a BMS. They are rack mountable. They can supply a crazy amount of amps so no worries about lack of power. Yes they are a little degraded but they have a ton of life left and at this price you can't go wrong. Maybe even add an active balancer but definitely use the batteries in the range of the discharge curve as shown. Large lifepo4 cells when fully charged typically drop in voltage. When we tested these they have been sitting for a while and still had good voltage so self discharging is not a concern although you will see self discharging when fully charged. They'll drop to 3.4-3.5v which is where they should be anyway as you can see with the discharge chart. You will lose some capacity but ultimately you want a setup that lasts many more cycles and stays balanced. Get them while they last!
Fully Charged voltage: 29.2v
Recommended fully charged operating voltage: 27v
Fully Discharge voltage: 20v
Recommended fully discharged operating voltage: 24v
Recommended max continuous discharge: 300a
Recommended max continuous charge: 150a
Weight: 125 lbs.
Dimensions: 20" deep x 17.5" wide x 6" tall
The 9th photo shows the pinout for the balance leads for your bms. Thank you Rich Gopstein for taking the time to provide that photo for us. The thermistors are 10k for those looking to add temperature sensing.