Battery chemistry & storage
Enter your coldest and hottest expected temperatures. See how five chemistries compare on combined climate performance.
How it works
Step 1
Use your actual coldest winter low and hottest summer high, not average temperatures, since the extremes are what stress a battery most.
Step 2
The combined score weighs both extremes equally, which is useful for a general comparison but worth adjusting if one season matters more to your use case.
Step 3
A chemistry can average well while still being weak in one direction. The cold weather capacity loss calculator and hot weather capacity loss calculator break out each extreme individually.
Sodium-ion's electrochemistry holds up notably better in cold temperatures than lithium chemistries, and it performs reasonably well in heat too, giving it the most balanced profile across a wide temperature swing, a chemistry-specific sensitivity NREL's battery thermal characterization research has documented across the industry. The sodium-ion comparison covers this chemistry's other tradeoffs beyond climate performance.
LFP tends to lose more capacity in extreme cold than NMC, but NMC tends to lose more in extreme heat than LFP, so which one performs better for you depends heavily on which season is your actual weak point. In a genuinely hot climate, the desert off-grid cooling load calculator is worth checking too, since keeping the battery enclosure itself cooler changes the real-world numbers on both sides of this comparison. Check your specific climate's dominant extreme before assuming either chemistry is the safer choice.
Capacity lost to cold or heat mostly returns once temperatures moderate again, which is different from calendar aging's permanent capacity loss covered in the calendar aging calculator. A longer-lived chemistry costs more up front. The payback period calculator in our Savings & Payback section can help you check whether the extra life is worth the price.
If oversizing looks like the more practical fix than switching chemistries, the temperature derate calculator can help you work out exactly how much extra nameplate capacity to add for your worst-case temperature. For the underlying thermal science behind these curves, NREL's energy storage research covers how different chemistries respond to heat and cold at the cell level.
Questions
Sodium-ion generally scores best across both cold and hot extremes among common storage chemistries, retaining more capacity than lithium or lead acid chemistries at temperatures below freezing while also holding up reasonably well in heat. This makes it worth considering for installations facing genuinely wide seasonal swings.
LFP's electrochemistry slows down noticeably at low temperatures, cutting usable capacity, but it tends to tolerate heat better than NMC due to its more thermally stable chemistry. That asymmetry means an LFP system's climate weak point is more likely to be a cold snap than a heat wave.
Not usually. Capacity loss from temperature is mostly temporary, recovering once conditions return to a moderate range, unlike calendar aging which is permanent. Size your system with enough margin to handle the worst season, and performance should return to normal the rest of the year.
Oversizing a less climate-tolerant chemistry can compensate for temperature-related capacity loss, and it's often more practical than switching to a specialty chemistry with fewer product options. Whether that tradeoff makes sense depends on how severe your climate swings are and how much oversizing would cost relative to a different chemistry.