Comparison
Sodium-ion vs lead-acid
For most daily-use backup, sodium-ion costs more to buy and less to run. For a rarely used small backup, lead-acid still makes sense.
| Sodium-ion | Lead-acid | |
|---|---|---|
| Maintenance | Sealed. No water, no acid handling. A yearly check. | Flooded types need water top-ups and terminal cleaning. |
| Weight for the same energy | Much lighter | Heavy; the batteries often need a rack or a trolley to move |
| Charge cycles | Thousands (maker figures vary) | A few hundred to about a thousand in daily use |
| Usable energy | Most of the rated capacity can be used | Usually about half, to protect the battery's life |
| Heat and cold | Designed for a wide range | Loses capacity in cold and ages quickly in heat |
| Charging speed | Accepts a faster charge | Slows as it fills |
| Purchase price | Higher | Lower |
| Disposal | Recycling routes are still developing | Established recycling in India |
General ranges for planning. The datasheet of the exact system in your quote is what counts.
Choose sodium-ion when
- The system cycles every day, or power cuts are frequent and long
- The battery sits in a hot or poorly cooled room
- Nobody at the site will do top-ups and checks
- Weight or floor loading is a constraint
Lead-acid can still be right when
- The load is small and cuts are rare and short
- The upfront budget is the deciding factor
- You are extending an existing lead-acid bank of the same age and type
We say so on the call. A smaller, cheaper system that fits your use is a better outcome than a bigger one.
Get a quote for your site
Tell us what you run and where. We reply with a sized system and a written quote.