Lithium Battery Charge Time & Runtime
Calculator for Off-Grid RV Power
The Lithium Battery Charge Time and Runtime Calculators help RV owners, van lifers, and off-grid travelers estimate how long lithium batteries take to charge or how long they’ll last under load. Enter battery capacity, charge rate, or power draw to size your solar and inverter system accurately for energy independence.
Why Accurate Battery Calculations Matter for RV Power Systems
Optimize Your RV Power Setup with Interactive Lithium Battery Calculators — Use our free, interactive Lithium Charge Time and Runtime Calculators to estimate how long it takes to recharge your 12-volt lithium battery and how long your connected equipment can run on a single charge. Simply enter your battery’s amp-hours, charge rate, or power load in watts, and adjust the state of charge or depth of discharge to see real-time results. Designed for RV owners, solar setups, and off-grid power systems, these tools help you size your batteries, chargers, and inverters for maximum efficiency and reliability.
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Pagosa Supply Co offers Lithionics & Epoch Lithium Batteries plus expert installation. Get Your Quote Today.
When you live or travel off-grid, knowing your battery charge time and runtime is critical.
Our calculators help you:
Size your battery bank correctly for your lifestyle
Match chargers, solar panels, and inverters to your system
Prevent over-discharging and extend battery lifespan
Understand real-world energy draw for air conditioners, refrigerators, and heaters
Whether you’re dry-camping for a weekend or boondocking full-time, these lithium tools help ensure you’ll never run out of power when you need it most.
How to Use the Lithium Battery Calculators
Enter your battery capacity (Ah) — your total available energy storage. Use this to increase Ah to see how much more runtime you get by adding batteries.
Enter your load or charge rate (W) — total watts used or delivered.
Adjust your State of Charge or Depth of Discharge (%) — to simulate different use cases.
View instant results for runtime or charge time based on your inputs.
Pro Tip: 30-amp RVs typically have up to 3,600 W available, while 50-amp RVs can draw up to 12,000 W — exactly what the calculators are built to handle.
Recommended Lithium Batteries for RVs and Off-Grid Power
If you’re ready to upgrade your setup, explore our premium LiFePO₄ lithium batteries.
We offer models designed for efficiency, durability, and high discharge rates perfect for mobile and stationary systems.
🔋 Lithionics 305Ah, 320Ah or 640Ah GTX Battery — Built like a tank, trusted, UL-listed power for luxury RVs
🔋 Epoch 300Ah or 460Ah— Bang for the buck, lightweight, reliable and rugged
Each battery includes an advanced Battery Management System (BMS), Bluetooth conectivity and self heating for safety, fast charging, and long cycle life.
Lithionics LI3 GTX Series
Premium Lithium Power for those needing over engineered performance in off grid situations
Epoch Essentials & Elite Series Lithium
Don’t underestimate this cost-effective, high-performance lithium battery system. It’s rugged, reliable, and loaded with all the right features.
Frequently Asked Questions
Q1: What makes lithium batteries better than AGM or lead-acid for RVs?
Lithium batteries provide more usable energy, faster charging, lighter weight, and longer lifespan. A 100 Ah lithium battery delivers nearly the same usable power as a 170 Ah lead-acid battery.
Q2: How long will a 300 Ah lithium battery last off-grid?
With a 300 Ah (12 V) battery, you have roughly 3,600 Wh of usable energy at 100% depth of discharge — or 3,240 Wh at 90%. Divide your total load watts (e.g., 300 W average) into that figure to estimate runtime — about 10–11 hours in this case.
Q3: Can I charge my RV lithium batteries with solar?
Yes. Solar panels paired with an MPPT controller are ideal for lithium batteries. Make sure your controller supports LiFePO₄ charging profiles.
Q4: What’s the safe discharge limit for lithium RV batteries?
Most quality LiFePO₄ batteries can safely discharge to 90–95%, but for longevity, many users set systems to stop around 80–85%.
Q5: How do I choose between 30A and 50A RV electrical systems?
A 30A system provides a maximum of 3,600 W (120 V × 30 A), while a 50A system provides up to 12,000 W (240 V × 50 A). The calculators above help you match your system to your available power.
Build the Perfect Off-Grid Power System
Our lithium experts can help you design a complete power system — batteries, chargers, solar panels, and inverters — tailored to your RV, van, or tiny home.
Every system is custom-configured for safety, efficiency, and long-term reliability.