Blog
Real-world guides on battery technology, solar system design, and electrical fundamentals. Practical knowledge from hands-on experience.
Battery Guides
Cold Cranking Amps: How Many CCA Does Your Engine Need?
Cold cranking amps is the cold-start rating stamped on every starting battery. Learn how many CCA your engine needs and how CCA differs from CA and MCA.
Drone Battery Flight Time: Why Real Numbers Are Lower
What DJI prints for each aircraft, the average power those figures imply, and how landing reserve and pack care change the minutes you fly.
E-Bike Battery Range: What Affects It and How to Maximize It
What sets e-bike range and how to add miles per charge: pedal-assist level, terrain, temperature, and reading the battery's watt-hour (Wh) rating.
How to Power a CPAP Machine Off-Grid
Run a CPAP off-grid: ResMed's printed current draws, battery sizing math, setup steps, and the FAA's printed watt-hour limits for flying with a battery.
Using a 12V Battery for Your Fridge During a Power Outage
Keep a fridge cold through a blackout on a 12V battery. Sizing math, inverter wiring options, and runtime estimates for common fridge wattages.
How to Calculate Battery Runtime
The runtime formula is capacity times voltage times depth of discharge, divided by load. This guide works through every variable with worked examples.
Depth of Discharge: How Deep Can You Drain Your Battery?
Depth of discharge drives battery lifespan more than any other factor. See the safe DoD limits that protect lead-acid, AGM, gel, and LiFePO4 cells.
LiFePO4 vs Lead-Acid Runtime Compared
A side-by-side runtime comparison of LiFePO4 and lead-acid, with real numbers on usable capacity, cycle life, charge speed, and lifetime cost per kWh.
How Long Will a Generator Run on Propane?
Learn how long a propane generator runs per tank. Includes fuel-rate tables, BTU math, worked runtimes for a 20lb tank, and 30lb and 100lb capacities.
Solar Guides
How to Calculate Your Off-Grid Daily Energy Needs
Calculate off-grid daily energy use step by step: list appliance watt-hours, apply the load method, then size the battery bank and the solar array.
Optimal Solar Panel Angle by Latitude and Season
Latitude tilt collects 96.55% to 99.79% of NASA POWER's modelled optimum at seven US sites. Get the tilt-by-latitude chart, the ±15° rule, and site examples.
Solar Panel Payback Period: How to Calculate ROI
Calculate a solar payback period step by step: install cost, incentives, energy savings, and how cash, loan, and lease financing each change the math.
Solar Panel Output Explained
A 400W panel rarely delivers 400W. See what trims real output (heat, shading, and tilt angle) and how to estimate the daily kWh you can expect.
How to Size a Solar Battery Bank
A step-by-step guide to sizing a solar battery bank: total your daily watt-hours, pick a chemistry, set autonomy days, and avoid common off-grid traps.
Electrical Basics
How to Size Transformer Fuses With NEC 450.3
Size a transformer's fuses the NEC way: full-load current times the 450.3 percentage, then a standard rating. Both code tables, the method, and two examples.
Locked Rotor Amps: Why Motors Spike at Startup
Locked rotor amps is the current surge a motor draws at startup. Learn to read its band from the NEMA code letter and size breakers for the inrush.
What Appliances Actually Cost to Run at Home
Find what every appliance costs to run. A meter-based field-audit method, real wattage numbers, and where the household savings actually live.
The Real Cost of Charging an Electric Car
Why one EV owner pays $300 a year to charge and another pays $1,800. The four levers (where, when, how, and what you drive) that set your cost.
Your Electricity Costs Broken Down: A Practical Guide
Break an electricity bill into the parts you can control: rate structures, appliance running costs, time-of-use pricing, and where the savings come from.
kVA vs kW: The Real Difference and When It Affects You
kVA and kW measure different things. The power triangle explained with worked examples for generator sizing, UPS ratings, and transformer calculations.
Horsepower to Watts: The Three Types of HP Explained
Mechanical, electrical, and metric horsepower differ by up to 1.4%. Conversion tables, real motor examples, and when that small gap actually matters.
Voltage Drop in Electrical Wiring: What It Is and When It Matters
Voltage drop in wiring explained with the formula, AWG resistance values, worked examples, and the NEC 3% recommended limit for branches and feeders.
How to Size Inverter Cable
Undersized inverter cable causes voltage drop, heat, and fire risk. Learn to size battery-to-inverter wiring by current, length, and 12-48V system.
What Is Motor FLA and How Electricians Use It
Full-load amps is the current a motor draws when running normally. Learn where to find FLA and why the NEC table value sets breaker and wire size.
Buying Guides
What Size Battery Charger Do I Need?
Size a battery charger from the maker's printed charge rate: 10% to 13% of the 20-hour rating on Trojan lead-acid, 0.5C on Victron LiFePO4.
What Size Inverter Do I Need?
How to pick an inverter's continuous and surge rating from your appliance labels, and what that size does to battery current and cable at 12 or 24 V.
RV Battery Sizing Guide
Work out how many batteries an RV really needs. A load audit, chemistry comparison, and sizing examples for weekend trips and full-time van living.