Thoughts on using Sodium Ion instead of Lithium for off grid storage?

I started playing around with a small sodium setup last fall for the garage workshop, and it has been interesting compared to my old lithium pack. The energy density isn't going to impress you, obviously. If you're trying to store maximum power in a tiny space, you are better off sticking with lithium right now. But if your priority is safety and longevity over raw capacity, it's actually very compelling. I'm running it on a simple 24V DC bus. My concern was the low cycle count everyone worried about, but after a few months of daily shallow discharge cycles, I haven't seen any degradation yet, and the thermal management seems much simpler than the heat sinks I used with my old chemistry. It feels solid, almost like a massive supercapacitor but with usable energy.

It doesn't feel like a full replacement for everthing yet, but for backup power storage in a non-critical setup, it's totally viable. The cost per kilowatt hour is just too attractive to ignore for most folks doing this kind of hobbyist project.

I think the previous comment is overlooking the context of DIY off-grid installations. When you are building a secondary shed off-grid, or even a permanent setup where space isn't brutally optimized, the density drop you are worried about isn't nearly as much of a problem as people think. For my project, which is powering a remote water pump and a few lights, the sheer volume of sodium units needed is manageable beacuse the system is physically seperate from the main house.

I put one of these systems in a shed a couple of years ago and my biggest headache wasn't the storage itself. It was the charging routine. My old lithium pack took about four hours to top up from empty, but the sodium unit needed significantly more time to hit the same charge level. You have to be careful with the specific charge profile you use when it's not running a heavy continuous load. Does anyone know if there are specific BMS settings that really help optimize the slow charging process without stressing the cells? It made the whole setup feel more involved than the plug and play LiFePO4 I was used to.

I've been looking at some of the failure rates for these sodium units, and they look seriously impressive on paper. My main question is about thier tolerance for big, fast drains. If I run a major appliance for a few minutes and then drop the voltage, how do they react compared to a well-cycled lithium pack? I'm worried about capacity retention if the cycling isn't super consistent. I figure since you're not running huge amperage loads, the thermal stress is low, but what about mechanical stress? Are they durable enough for a DIY setup where a few things might get bump or jostled over time?

I've been reading up on the specific discharge characteristics of sodium-ion cells, and what I am curious about is the actual voltage profile stability during sustained load. Since these units are less mature than lithium chemistries, I wonder if there is a notable increase in internal resistance over time which would lead to a more aggressive voltage sag when supplying continuous current to tools. It is quite critical for my planned setup that the voltage remains steady enought that I do not introduce fluctuations that could harm sensitive electronics, and I am trying to figure out if the degradation profile matches my operational expectations for daily workshop use.