Guides on lithium batteries are most useful when they connect basic battery knowledge to real decisions: how much capacity you need, how charging works, what changes in series or parallel, how wiring and protection affect safety, and which checks matter for solar, RV, marine, backup, and off-grid systems.
This hub organizes the site’s published learning paths so you can begin with fundamentals, move into practical calculations, and then verify product-specific limits before buying or installing equipment.
Start with the decision you need to make, then use the matching article or calculator to understand the numbers behind it. The goal is a clear path from learning to verification, not a collection of disconnected definitions.
A battery project can become confusing because several units and components interact at once. Amp-hours describe charge, watt-hours describe energy, watts describe load power, volts affect current, and the battery management system adds protection limits that are separate from stored energy. The What is a Lithium Battery introduction is a practical first stop if those terms are still new.
If you already have a project in mind, skip directly to the relevant path. Solar and mobile users can begin with Solar & RV planning; people building or modifying a DC system can move to the Wiring hub; and anyone working around installation, storage, temperature, or damage should read the Safety hub before treating a calculator result as an installation instruction.
A useful reading order is fundamentals → energy sizing → charging → current and wiring → protection → application details. That sequence mirrors how a real system comes together. First you decide what the battery must do; then you determine how much energy is needed; then you confirm that the charging sources can replace that energy; finally you check whether the conductors, fuses, BMS, inverter, and environment can support the resulting current and operating conditions. The order is not mandatory, but it reduces the chance of optimizing one number while overlooking another part of the system.
These Guides are also designed for cross-checking. If a runtime estimate looks surprisingly long, compare the same battery with the LiFePO4 Battery Calculator or the Lithium Battery Calculator. If the calculated current seems high, review system voltage and cable distance before selecting wire. If a charging estimate seems slow, compare charger current with the battery manufacturer’s allowed charge rate instead of assuming the battery is undersized.
Ask whether you are choosing chemistry, estimating capacity, checking runtime, planning charging, reviewing wiring, or solving a safety question. Starting from the decision prevents you from collecting specifications that do not answer the problem you actually have.
Calculators are most valuable once you understand their inputs. A battery capacity conversion can be correct mathematically while still being incomplete for a real installation if load surges, temperature, losses, or BMS limits are ignored.
General Guides help you identify what to check, but the final charge voltage, current limit, series/parallel permission, temperature range, torque value, and protection requirements come from the exact battery and equipment documentation.
Use these topic groups to move from fundamentals to application-specific planning. Each card links to a published page in the site’s current WordPress structure.
For chemistry questions, compare the Lithium Battery Types Guide, LiFePO4 vs Li-ion, and Lithium vs Lead Acid. For system design, move from battery size to charging, wiring, BMS protection, and application constraints. That sequence keeps the energy calculation tied to the components that must actually carry and replenish the energy.
The same topic can require different Guides depending on context. A 100Ah battery used in a small portable setup raises different questions from a 100Ah battery feeding an inverter in an RV. The stored-energy math may be similar, but cable current, recharge sources, vibration, ambient temperature, enclosure, monitoring, and critical-load expectations are different. Use the general articles to learn the principles, then move to the closest application page before making hardware decisions.
Learn what lithium batteries are, how nominal voltage and capacity relate, why chemistries differ, and which terms matter before you compare products or system architectures.
Start with battery basicsUnderstand charging stages, current, voltage, charger compatibility, temperature restrictions, and the difference between estimating charge time and choosing real charger settings.
Read the charging guideLearn how voltage, current, amp-hours, cable length, fusing, and battery-bank configuration interact before you connect high-current DC equipment.
Explore wiring topicsUnderstand battery management system protection, common warning signs, temperature limits, storage precautions, and why a BMS does not replace correct external wiring and over-current protection.
Learn about BMS protectionBuild an energy budget, estimate storage, compare 12V/24V/48V approaches, and coordinate solar, alternator, shore-power, and inverter loads.
Open Solar & RV GuidesPlan safe storage, understand what to do with damaged or retired batteries, and use local approved recycling and transport channels instead of treating lithium batteries as ordinary household waste.
Read recycling and disposal guidanceChoose the project that best matches your goal. The Guide Finder recommends a short learning path, while the linked calculators handle the arithmetic once you know which inputs matter.
This tool does not approve an installation. It simply routes you to the most relevant published Guides and calculators for the question you select.
Start with battery fundamentals, then compare chemistry and learn how BMS protection fits into a complete system.
Estimate battery capacity from energy use, system voltage, and planning assumptions. Use it after you have a realistic load list rather than starting with a battery size you hope will be enough.
Use the sizing calculatorUse current, system voltage, and cable distance for an initial conductor-size check. Final cable and protection selection also depends on insulation, routing, temperature, terminals, fault current, and applicable requirements.
Check wire gaugeCompare how series and parallel connections change bank voltage, capacity, and energy. Confirm that the specific battery model permits the planned configuration before connecting packs.
Plan a battery bankThe best Guides connect simple formulas to the limits those formulas do not capture. Use the math to compare scenarios, then verify current, charging, temperature, and protection with the exact equipment.
Battery amp-hours are not enough to compare energy across different voltages. Convert to watt-hours first:
A 12.8V 100Ah battery contains 1,280Wh of nominal energy, while a 25.6V 100Ah battery contains 2,560Wh. The Battery Capacity Calculator helps when you need to move among Ah, Wh, and related units.
Runtime is a planning estimate, not a guaranteed clock time. A simple model is:
If 1,000Wh reaches the load and the average load is 200W, the simple estimate is about five hours. Real runtime can differ because of changing loads, inverter losses, temperature, battery condition, BMS cutoffs, and reserve settings. The Battery Runtime Calculator is useful for scenario checks.
At a given power level, lower system voltage means higher current. A first-order relationship is:
A 1,200W DC load is roughly 100A at 12V before losses, but about 50A at 24V. That difference affects conductor size, voltage drop, connectors, fusing, and BMS current requirements. Use the wire gauge tool only as an initial planning aid.
A battery can be large enough for the load yet still be poorly matched to the available charging sources. Estimate how much energy you remove each day, then check whether solar, alternator, shore power, or a charger can replace it in the available time.
Use the Battery Charge Time Calculator for a basic time estimate and the Solar Battery Bank Calculator when daily solar storage is part of the plan.
Series and parallel connections change different electrical quantities. With compatible batteries in series, voltage adds while amp-hour capacity remains the same. With compatible batteries in parallel, amp-hour capacity adds while nominal voltage remains the same. In a simple matched bank, total nominal energy still follows voltage × amp-hours.
That arithmetic is only the starting point. Batteries may have manufacturer limits on how many packs can be connected in series or parallel, and mismatched age, state of charge, capacity, chemistry, or internal resistance can create problems. Use the Series / Parallel Battery Calculator for layout math, then confirm the planned configuration in the exact battery documentation.
Battery voltage is useful, but it is not a universal fuel gauge. The relationship between voltage and state of charge depends on chemistry, temperature, rest time, charging or discharging current, and the battery’s voltage curve. LiFePO4 in particular can hold a relatively flat voltage through much of its usable range, so small voltage differences may not map cleanly to a precise percentage while the battery is under load.
Use the Lithium Battery Voltage Chart as a reference and the Battery State of Charge Calculator as an estimate, not as a substitute for a properly configured monitor or manufacturer-specific guidance.
| Your question | Read first | Useful tool | Verify before acting |
|---|---|---|---|
| How much battery do I need? | Solar & RV planning | Battery Sizing Calculator | Daily Wh, reserve target, system voltage, load peaks, charging availability |
| How long will it run? | Battery types and ratings | Battery Runtime Calculator | Average load, conversion losses, usable capacity, temperature, cutoff behavior |
| Can I connect batteries together? | Wiring hub | Series / Parallel Calculator | Manufacturer series/parallel permission, matching batteries, BMS and protection limits |
| How should I charge safely? | Charging guide | Charge Time Calculator | Exact charge profile, current limit, temperature limits, charger compatibility |
| What if the battery is old or damaged? | Lithium Battery Safety Guide | Recycling & Disposal hub | Local hazardous-waste rules, transport restrictions, recycler instructions |
Suppose an RV uses a 60W refrigerator that averages 12 hours of compressor-on time per day, 40W of lighting for 4 hours, a 20W fan for 6 hours, and 300Wh of miscellaneous electronics. The daily energy estimate is 60 × 12 + 40 × 4 + 20 × 6 + 300 = 1,300Wh. That number is more useful than guessing that “a 100Ah battery should be enough,” because it gives the storage and charging questions a common energy target.
If the system uses a 12.8V LiFePO4 battery and the planning model assumes 90% usable depth of discharge, the idealized capacity before other losses is about 1,300 ÷ (12.8 × 0.90) ≈ 113Ah. Adding inverter losses, standby draw, reserve for poor charging days, and future loads may push the practical target higher. This is where the RV Lithium Battery Calculator and Battery Sizing Calculator help compare scenarios instead of pretending one number is final.
Next, check recharge. If the system removes roughly 1.3kWh per day, the charging sources need enough real-world energy to replace it. Then check peak power separately: a 1,500W inverter can demand far more current than the average daily energy calculation suggests. That leads to the Wire Gauge Calculator, BMS current limits, fuse selection, and inverter documentation. The example shows why the Guides are organized as a sequence: energy, charging, current, protection, and verification.
These Guides and calculators are educational planning resources. They cannot inspect your battery, validate a wiring installation, certify a charger, or determine whether a damaged pack is safe to handle. Manufacturer instructions and applicable electrical requirements should take priority over general examples.
For end-of-life and damaged batteries in the United States, the U.S. EPA lithium-ion battery FAQ provides recycling information. For shipping and transport questions, use the U.S. PHMSA lithium battery resources. Requirements vary by location and situation, so use the authority that applies to you.
Instead of testimonials, this section keeps the template’s three-card structure and uses it for real project routes. Pick the path that matches the work you are doing.
Build a daily energy budget, estimate storage, check charging sources, then review current, wiring, and temperature limits. A battery swap is often a system review rather than a one-component replacement.
Measure the actual load first, compare it with usable battery energy, then check whether charging restores the energy you expect. Avoid buying a larger battery until you know whether the problem is load, capacity, charging, or system losses.
Short answers for choosing a learning path, interpreting calculator results, and knowing when general battery information should give way to product-specific documentation.
Begin with What is a Lithium Battery, then read the Lithium Battery Types Guide. Once voltage, Ah, Wh, chemistry, and BMS roles make sense, move to sizing, charging, wiring, or the application that matches your project.
Use a guide first when you are not sure which inputs matter. Use a calculator once the inputs are meaningful, then return to the explanatory material to check assumptions and limits. A mathematically correct result can still be unsuitable if the load, battery limits, wiring, temperature, or charger compatibility were entered or interpreted incorrectly.
LiFePO4 is a major focus, but the site also covers broader lithium-ion topics and comparisons. Always check which chemistry a page assumes. Nominal cell voltage, charging limits, temperature behavior, and safety characteristics are not interchangeable across every lithium chemistry.
Start with power level, current, cable length, inverter size, charging sources, and equipment compatibility. Higher system voltage reduces current for the same power, but the best choice depends on the full system. Compare the site’s 12V, 24V, and 48V lithium calculators for planning examples.
They can explain the variables and provide preliminary calculations, but final conductor and over-current protection choices depend on current, length, conductor material, insulation, routing, ambient temperature, terminals, fault conditions, equipment instructions, and applicable rules. Use the Wire Gauge Calculator as a starting point, not final approval.
Read the Lithium vs Lead Acid comparison, then review charging, BMS protection, temperature limits, and wiring. A physically compatible battery can still require charger, alternator, converter, fuse, monitoring, or cable changes.
They are part of the ownership cycle, not an afterthought. The Lithium Battery Storage Guide covers longer idle periods, while the Lithium Battery Recycling Guide and Recycling & Disposal hub help with end-of-life planning.
Give priority to the documentation for the exact battery and connected equipment, then to applicable laws, codes, standards, and qualified professional guidance. General Guides are educational references and should not override a manufacturer limit or a legal requirement.
Use the Guides to understand the decision, use a calculator to test the numbers, and then verify the result against the exact battery, charger, inverter, BMS, wiring, and safety requirements for your project.
Find Your Next Guide