What’s the Lithium battery option in Inverter/UPS/Solar PCU? We at Su-vastika have provided our inverter/UPS/Solar PCU to connect Lithium battery LifePO4-based technology. So far, all the Inverters/UPS solar PCU sold can only connect Tubular SMF and lead Acid batteries. There is a switch at the back of the product through which you can switch and install these three types of batteries. So far, all the inverters available in the market are made purely for installing Lead Acid batteries only, like Tubular batteries, SMF batteries or Lead Acid batteries designed 20 years back. Now people are designing Lithium based Inverters/UPS, which are purely for Lithium batteries only, and they supply lithium batteries only.
At Su-vastika, we realized that the market is shifting towards Lithium batteries. In the next five years, the market will shift the majority towards the Lithium battery only, so we thought of designing the inverter/UPS where all the existing batteries and adding a Lithium battery is also possible. So one can buy a Lithium Iron Phosphate LifePO4 battery and install it with our Inverter/UPS/Solar hybrid PCU without making any changes. We have changed the charging software along with the limits of Low battery and boost voltage according to the lithium battery. In our Bluetooth-based Inverter/UPS/Solar PCU, the user can select the switch on the mobile application and make the changes very easily. In the mobile application, there is a provision for seeing which battery you have selected so the user doesn’t change the settings by mistake. Otherwise, there may be a problem with the charging profile.
The settings for the Tubular and SMF batteries are the same where the battery cutoff is at 14.4 Volts, or called the boost voltage, and the Lead Acid boost voltage is maintained at 13.8 volts, or boost voltage is maintained at 13.8 Volts. In both cases, the Float voltage starts, which charges the battery to the low current and brings it to 13.6 Volts to make the gravity of the battery get the maximum power from the battery. So in lead Acid batteries, there are generally Four stages of charging: Bulk, Absorption, Float and trickle charging.
In the Lithium battery, only one stage works: the bulk charging stage and the Absorption stage is there for a very short period. Trickle charging and Float charging are harmful to the lithium battery, so The charging profile required by the Lithium battery is completely different from the Lead Acid based batteries.
In all three batteries, the low battery cutoff is maintained at 10.5 Volts which has become the industry standard. But in the case of Lithium batteries, there are different chemistries used to make the cell, and the charging method is very different from the Lead Acid or Tubular battery.
Lithium batteries have very tight controls for charging and discharging, and the battery comes with the battery management System, which is an extra precaution in case someone tries to charge it with a higher current or voltage or discharge with a higher current. So we have provided our Pure Sinewave UPS, Pure Sinewave UPS with ATC and Solar hybrid PCU for the Lithium battery LIFEPO4-based technology. In the lifePO4 lithium battery, the individual cell has a 3.2Volt cell, and we charge differently than the normal lead Acid battery. So the individual cell is charged a maximum of 3.65 volts, and the lower limit of battery cut is 2.8 Volts to maintain the battery life.https://www.power-sonic.com/blog/lithium-vs-lead-acid-batteries/
Let us compare these two batteries and see why the change will happen in the next five years, where the Lithium battery will take over the Inverter/UPS industry very smoothly.
The life of the Lithium battery compared to Lead Acid Batteries, specially Tubular batteries: If Lithium batteries are charged properly. Low and High batteries are maintained strictly in the Inverter/UPS usage or power backup case. This can last from 10 to 12 Years easily, four times the life of Lead Acid batteries like Tubular and five times the life of SMF batteries.
The Charging Time of Lithium battery Vs Lead Acid tubular battery: This is the biggest factor in favour of Lithium batteries as they can be charged in 2 to 3 hours, and Lead Acid battery, like Tubular battery, takes 15 hours to charge, which is so convenient for any areas where the power cuts take place intermittently. Power goes and comes back. Then the 50 Ah Lithium battery can give three times the backup of a Lead Acid tubular battery. Because 150Ah Tubular battery might give 2 hours back up after charging for 15 hours, and 17 hours are gone out of 24 hours, whereas the 50 Ah lithium battery can give you backup time eight times at least in 24 hours, which can result in 400Ah Capacity out of 50 Ah battery
The Capacity of the battery we get in Lithium Vs Tubular battery: this is the mind-boggling parameter which will be understood by people soon that the Tubular battery comes in C20 Capacity sticker or the Solar battery comes in C10 capacity sticker. The Lithium battery comes in a C1 capacity package. How do we understand this factor?https://suvastika.com/battery-size-selection-in-ups-inverter-for-cost-saving/
Clean technology vs Polluted technology: People using Tubular batteries in their homes and offices are breathing Lead fumes because the Tubular deep discharge batteries emit lead-based fumes, which are very harmful to the people consuming them. The lithium battery is a clean technology with no fumes or emissions of any gasses. So health hazard is the major challenge in Tubular batteries.
Depth of Discharge in Tubular Vs Lithium battery LifePO4
Power bill for Charging comparison of Lithium battery Vs Tubular battery.