RV · Marine · Off-grid
Plan Your RV & Off-Grid Power System
Build your power plan around the energy you use. Practical guides and calculators help you connect batteries, solar charging and protected wiring for RV, marine and off-grid systems.
- Independent guidance
- Editable assumptions
- System-first planning
01 / Put numbers behind the plan
Four tools. One connected system.
Start with daily energy use, then work through storage, charging and wiring. Each calculator is a planning aid with visible assumptions.
Size your battery bank
Turn daily watt-hours and reserve days into a capacity estimate.
Calculate capacity →Estimate battery runtime
Check how long a chosen battery may support a steady load.
Calculate runtime →Plan your solar array
Estimate panel wattage from daily energy use and available sun.
Calculate solar →Check 12V voltage drop
Compare current and cable length with a voltage-drop target. Ampacity needs a separate check.
Check wire size →02 / Why Global Batteries
Built around how power systems actually work
We connect battery capacity, charging, conversion, cabling and protection instead of treating products in isolation.
Independent guidance
We explain published specifications and planning assumptions. We do not represent a battery manufacturer.
Editable assumptions
Calculators expose their inputs and limitations, so you can replace defaults with your own measured loads.
System-first planning
Storage, charging, conversion and wiring are sized together — one weak link limits the whole system.
Source-backed specifications
Product facts link to manufacturer documentation or another identified source, with access dates.
No undocumented testing
We only say “tested” when the page publishes the equipment, procedure, conditions and result.
Clear limits
Final designs need equipment instructions and the electrical rules that apply to your installation.
03 / Start with your setting
Different trips. The same planning discipline.
The energy balance is a useful starting point in every setting. Installation requirements depend on the equipment and where it is used.
RV & camper
Balance overnight loads, off-grid days and the time available for solar, alternator or shore charging.
RV power guides →Marine
Separate house and starting needs. Account for wet locations, corrosion and the marine standards that apply.
Plan safer wiring →Off-grid
Plan for seasonal sun, longer autonomy and backup charging. Check the rules for a fixed installation.
Size your solar →04 / Understand the next decision
The essential planning guides
Read the context behind the numbers before choosing equipment or installing a system.
Size an RV battery bank
Build a load audit, choose autonomy and check peak current.
Read the sizing guide →
Choose a lithium battery
Compare usable energy, BMS limits and charging compatibility.
Read the buying guide →
How long will 100Ah last?
Why the same battery can produce very different runtimes.
Read the runtime guide →
Plan safer 12V wiring
Calculate round-trip voltage drop and verify protection.
Read the wiring guide →