Your Choice: Two 12V 314Ah batteries in parallel or one 12V 628Ah battery?

Poll: Which battery setup do you prefer and why?

  • Let's dive into a practical battery configuration dilemma. We're comparing two different ways to achieve a high-capacity 12V system:

    • Option A: Two 314Ah Batteries in Parallel(2P)

      • This involves connecting two lower-capacity lithium cells in parallel to create a 12V system, resulting in a total capacity of 12V 628Ah.

    • Option B: One Single 628Ah Battery

      • This is a single, large-format battery that natively provides 12V 628Ah as a complete, integrated unit.

    Both options offer the same total energy (approx. 3.8 kWh), but they come with different trade-offs in terms of performance, reliability, cost, and flexibility.

    Please vote in the poll and share your reasoning in the comments! Consider:

    • Cost & Value: Which offers a better price per kWh long-term?

    • Reliability & Redundancy: Is redundancy (if one cell in Option A fails) important, or is a simpler system (Option B) better?

    • Performance: Considerations for balance, internal resistance, and peak discharge currents.

    • Maintenance & Monitoring: Ease of use, wiring complexity, and BMS requirements.

    • Future-Proofing: Which setup is easier to repair, expand, or replace?

    Let's discuss! What's your verdict based on your experience?



  • Prefer Option B. I'm a beginner, so I want to build power bank quickly and easily.


  • To be honest, I'm someone who avoids trouble. I prefer a single battery. Their capacity might be the same, but assembling it yourself is more cost-effective in terms of price. However, I'm willing to make a small sacrifice to avoid the trouble I dislike.


  • Redundancy and upgrading. If something happens to the 600ah battery, you have no power. If one 314 battey fails you have a backup. 

    You can put two 314 batteries in series to get a 24v system if you want to upgrade.  


  • Option A two in parallel connected with Anderson plugs.Primarily because of the weight and ability to grab one for other uses. 


  • I have 2 of the 314ah 12v batteries in series because I need 24v.  But the bms on one of them failed.  So while I appreciated the simplify ofhaving one 314ah battery instead of 3 smaller ones, now I wish I had the smaller ones.


  • I would find it very diffcult to move a 120+ lb battery, so a 12V 314Ah battery is my practical limit.  So 2 batteries in parallel.


  • 2 separate ones

    Redundancy, esp for the BMS (I think this is more likely to fail than the cells

    flexibility for voltage (serial or parallel)

    flexibility of form factor - the big one might just not fit, with 2 smaller ones there are more options

    handling - weight of the big one

    a big one may be fine in an even larger setup with multiple big batteries...


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