The battery that I received measured nearly 0 V across the battery terminals, even after fully charging with an Eco-Worthy 20 A LiFePO4 charger. I contacted Exo-Worthy customer service and they responded the next day with some instructions for evaluating the battery, and upon completing the evaluation they determined that the battery was defective and immediately shipped a replacement free of charge. The replacement battery worked perfectly and has met all of my expectations.
Eco-Worthy asked if I’d be willing to conduct a tear down of the original defective battery, to help determine the cause of the problem so that they could use the information to improve their product. I agreed, and upon opening the battery case and removing the cell pack I discovered that the BMS cable had been routed in a manner that resulted in it being pinched between a steel bracket and the side of the battery box, which ultimately cut one of the 5 wires. I reported the findings to Eco-Worthy and they immediately shipped me a new BMS cable, again free of charge, so that I had the opportunity to repair it if I would like to do so. I did and the battery now works flawlessly. The customer support team at Eco-Worthy was outstanding, and despite initial disappointment with the defective unit I would not hesitate to buy another Eco-Worthy product considering the phenomenal customer support that they demonstrated.
Repairing the first battery also provided me the opportunity to evaluate the design and construction of the internal components, and I was very impressed with what I saw! The four battery cells were all secured together in a custom designed, powder coated steel cage, neatly secured together and protected with a dense foam product on all sides. The BMS was a JBD (Jiabaida) brand; a high quality, respected and well known BMS manufacturer. The BMS was securely mounted to the cage structure, complete with an aluminum heat sink and plenty of air space surrounding it. The BMS cable was a customer harness, wrapped in cable cloth and each wire was cut to match the distance to the corresponding cell terminal. Ring terminals were crimped to each wire end and heat shrink protected the connection. The 5 pin end of the harness at the BMS included a dab of sealant to ensure it remained connected. The cell connections were all secure, with the final positive and negative terminals in the series secured with a nut that included some sort of thread lock material. Lastly, the positive and negative wires were 6 gage silicone cable, and were routed in such a way to ensure that the positive and negative could never come into contact or abrade against each other to short the battery. All in all, the quality of the internal construction and the quality of the components used were very impressive. I’m very pleased that I purchased this Eco-Worthy battery.
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Would be nice if we all have similar cells, similar equipment, to agree on the best settings that we can all use and see how the banks perform over time, adjusting as needed.
My settings:
BMS:
Total Capacity: 280ah
Cycle Capacity: 224ah (80%)
Cell full voltage: 3.450v
Cell Minimum voltage: 2.900v
80%: 3.325v
60%: 3.275v
40%: 3.250v
20%: 3.200v
Balancer:
Start Voltage: 3.200v
Delta to Balance: 0.010v
Balance Only when Charging: Yes
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BMV: … if one has one …
Charge Efficiency: 99%
Peukerts Exponent: 1.05
Charged Voltage: 0.3% below Absorption
Tail Current: 4% (~2 to 4%)
Discharge Floor: 20%
Charged Detection Time: 3 (~2 to 5 min.)
5kva MPII:
State of Charge when Bulk is finished: 95%
Charge Efficiency: 0.99
DC input low shut-down: 2.9v - 46.4v
DC input low restart: 3v - 48v
DC input low-pre alarm: 3.1v - 49.6v
Absorption: 3.55v per sel - 56.8v
Float: 3.4v - 54.4v
Charge: with 280ah, max inverter can do, 70amps
Repeat absorption: 1.00
Repeat absorption interval: 7
Absorption time: 1
With the 280ah EVE, I want to get it right … so with 17/18 cells, the above will have to be adjusted, as Victron can handle 38–66V, so methinks for 18 cel bank to go for 3.4v x 18 = 61.2v
I’m open for ideas, feedback, suggestions?
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