I'm noticing a big price difference between 48V and 12V batteries. For instance, I found a 100AH 48V battery for $700 from an unknown brand, but I can get a 300AH 12V battery for just $300-$400. Given that most of a battery's cost comes from the cells and the BMS, it seems like combining four 12V batteries into one setup with a single BMS shouldn't make things significantly more expensive. Sure, 12V batteries are heavier, but shipping costs wouldn't really change. So why isn't it possible to find a 100AH 48V battery in the $400-$500 range?
3 Answers
That's a good point! However, remember that 48V batteries often come with better build quality and features, like a steel case instead of plastic and a more reliable BMS. Using four 12V batteries in series typically requires a battery balancer, which adds to the overall cost. So those factors could explain some of the price difference.
Is a balancer even necessary? I built an off-grid 48V setup without one, and it worked fine for over 10 years!
Quality is key, and 12V batteries are just more commonly bought, which means lower manufacturing costs. But 48V requires specific components rated for higher voltages, which can complicate things. It’s definitely worth considering the long-term reliability and safety of cheaper 12V options before making a decision.
For those willing to DIY, I suggest buying individual cells and a good BMS. It's not rocket science, and there are plenty of guides out there!
Totally! I've been using Redodo 24V batteries for my setup, and they've been working great without any issues.
You're onto something! A lot of those 300AH 12V options are often mislabeled or not as reliable as they seem. Also, with four separate BMSs, you could run into issues with balancing, which might harm your battery life in the long run. Plus, don’t forget about the additional costs for cables and connectors when using multiple batteries.
I've actually set up two banks of 12V batteries to create 48V, and while I don’t use a balancer, I'm looking into getting one soon. It's a hassle, but I'm curious about the long-term effects.
That’s true for all batteries. Just wondering if the cheaper brands will still be reliable years down the line.
But even with those extra components, it doesn't add up to enough to justify the $900 difference. I mean, a plastic case 48V battery is around $740, which seems way too high compared to the 12V prices.