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I don't understand the statement or even recommendations that buying a server rack battery is about the same price as building your own DIY battery.
With the long cycle life of Lifepo4, I think it ultimately comes down to the supporting components that make the difference. As long as you keep the batteries withing the proper voltage they'll last past any of the other parts.
In a DIY system, the BMS breaks, or a something comes loose you swap it out or tighten it. In a server rack battery, you pray the company you bought your server rack battery from is still in business, you fight with them for a replacement, or you ship it back to them and get it back months later. You cannot open it up, because it breaks your warranty. If they are no longer in business, you're harvesting the cells, then building a DIY battery anyways.
Also, due to the exceptionally long life of Lifepo4 there's deals to be found on used cells, just like buying a used car will save you money.
I currently have purchased:
1. 4 x Used BYD 24v battery packs from Batteryhookup April- for about $ - I'm still getting about 100ah out of each, but these were purchased knowing they are heavily degraded. I picked them up from their warehouse. They're an awesome company. 200ah@48v
2. 32 x 200ah cells purchased from Alibaba in Jan- for $ 400ah@48v
3. 32 x 100ah cells purchased from Aliexpress March- for $ 200ah@48v
4. 30 x 280ah cells June- for $ from Craigslist, then 2 x 280ah cells from ebay for $300. Found someone selling these cells locally he was going to use for RV project, but then it got to be too much for him. Two of the cells had shipping damage, so I didn't buy those and bought replacements on ebay. They're not matched, but they have been working great for the 6 months I've had them. 560ah@48v
I paid a significant less amount for the used batteries, but in both scenario's "new" from china and used DIY pricing is much better than the server rack battery. Even after purchasing a BMS & Wiring.
The SOK 48v 100ah battery is currently $ * 13 = $20,800
Used average of what I paid per 100ah: $ / ah * 100 = $540 per 100ah
The racking from Home depot, bus bars, BMS's, Fuses, and Wiring didn't cost me $13,474, and I have a very modular, serviceable system.
I'm genuinely curious as to why someone chose Server rack batteries, other that they look better or they were easier to setup.
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