The same arithmetic, applied to boats, RVs, carts, homes and vehicles.
Sizing for solar, storage and off-grid
Size from the night load and the recharge window, not from the array rating.
- How To Convert Amp Hours (Ah) To Kilowatt Hours (kWh)
- How to Convert Ah to kWh (Formula and Calculator)
- How Many kWh Is 1 Amp
- How Many kWh Is 1 Unit
- How Many kWh is a 48V 200Ah Battery
- How Many kWh Is 100Ah in 48V
- What Does 13.5 kWh Mean
- How Much Does a Shoto 5.12 kWh Lithium Battery Weigh
- How Do You Calculate kWh for a LiFePO4 Battery
- Is 40 kWh per day a lot
Sizing for carts, boats and vehicles
For traction the question is range and draw; for marine it is trolling hours plus house loads.
- What’s the Range of 48V 50Ah Cart Batteries
- 36V 80Ah vs 100Ah LiFePO4: Range Difference
- How to Choose a 36V 30Ah LiFePO4 Battery for Boats from a China Manufacturer？
- How Does a 60V 25Ah Ebike Lithium LiFePO4 Battery Pack Power an Efficient 1500W System
- What Battery Fits Fairplay Utility 4 Passenger 48V Cart
- What is the Mileage of a 60V 28Ah Lithium Battery
- Exploring the Performance Potential of a 48V 1500W Ebike Battery
- What Happens if I Use a 48V 20Ah Battery Instead of the 48V 12Ah Original Battery of My eBike? Will It Damage It
- How Far Will a 48V 20Ah Battery Last? Understanding Range and Influencing Factors
- What Is the Voltage Range of a 48V 100Ah Lithium Battery
Voltage & sizing questions
The questions that come before an order.
What voltage should I choose for a lithium battery?
It is set by the equipment: 12V for small loads and vehicles, 24V for light traction and vans, 48V (51.2V) for storage and most traction, higher for industrial systems. Match the device first, then choose amp-hours.
How do I work out runtime from amp-hours?
Multiply amp-hours by the nominal voltage for watt-hours, then divide by the actual load in watts. A 48V 100Ah pack is about 4.8kWh, which at 500W is roughly nine hours.
Is a higher voltage always better?
No. Higher voltage means lower current and thinner cable, but it also changes the charger, the BMS and often the whole system. Step up only when the equipment or the cable run demands it.
What does C-rate mean?
The current expressed relative to capacity: 1C on a 100Ah battery is 100A. Discharging faster than the cell rating shortens life and usually trips the BMS.
Why is a 12V lithium battery labelled 12.8V?
Because LiFePO4 cells are 3.2V nominal, so four in series give 12.8V. Equipment designed for 12V lead-acid accepts that range without modification.
