Van Solar & Electrical Blog
Guides, comparisons, and how-tos on van solar, batteries, wiring, and off-grid power — from the team behind the VanSolarCalc sizing tool.
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Cleaning and Maintaining Van Solar Panels
Oct 2, 2026 · 5 min read
Van solar is close to maintenance free, which is why the little it needs gets skipped for years until output has quietly fallen.
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Solar vs Alternator vs Shore Power for a Van
Oct 1, 2026 · 4 min read
Every van has three ways to fill its battery. Most builds use two. The best builds choose deliberately instead of defaulting to solar.
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10 Van Electrical Mistakes That Cause Fires
Sep 29, 2026 · 5 min read
A van carries house-level current in a vehicle that vibrates, flexes and gets hot. Mistakes tolerated in a shed become fire risks on the road.
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Can You Live Off Solar in a Van?
Sep 28, 2026 · 4 min read
Yes in the sunbelt, and no through a northern winter without a second source. Three numbers decide which answer applies to you.
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Is Van Solar Worth It? Cost and Payback
Sep 25, 2026 · 4 min read
Van solar has a far better return than house solar, for an unusual reason: it competes against campground hookup fees, not cheap grid power.
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Solar Panels Not Charging Your Battery? Fix It In Order
Sep 24, 2026 · 5 min read
Panels in full sun, controller showing nothing, battery going flat. In most cases this is a connection or configuration problem, not a dead panel.
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Amp-Hours vs Watt-Hours: What Actually Matters
Sep 22, 2026 · 4 min read
Batteries are sold in amp-hours, panels in watts, appliances in watts. Somewhere in the middle a lot of van builds go wrong.
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12V Fridge Power Consumption: Amps and Daily Use
Sep 21, 2026 · 4 min read
The fridge is the biggest load in most vans and the one people size worst, because they read running amps and assume it draws that all day.
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12V Battery Voltage Chart: State of Charge Explained
Sep 18, 2026 · 4 min read
Reading battery voltage is the fastest way to check state of charge, and for lithium it is also close to useless. Here are both charts, and why one of them barely works.
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Van Appliance Power Consumption Chart (12V)
Sep 17, 2026 · 5 min read
Every van power calculation starts with the same step: a list of what you run and for how long. Here is that list, with realistic wattages rather than packaging figures.
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How to Test a Van Solar System With a Multimeter
Sep 15, 2026 · 6 min read
Five checks, in order, that turn 'my solar is not working' into a specific fault in about ten minutes.
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Van Fuse Sizing: What Size Fuse for Every Circuit
Sep 14, 2026 · 5 min read
The fuse protects the cable, not the appliance. Sizes for every circuit, and why the main fuse belongs inches from the battery.
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12V vs 24V for a Camper Van: Which Should You Build?
Sep 11, 2026 · 5 min read
Double the voltage, halve the current. What that actually saves in cable and fuses, and the converter costs nobody mentions.
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Best Budget Van Solar Setup Under $1,000
Sep 10, 2026 · 2 min read
Under $1,000 gets a fridge, fan, lights and charging off-grid. The exact budget parts list.
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MC4 Connectors and Solar Wiring Explained
Sep 8, 2026 · 2 min read
The little plugs on every panel cable. How they click together and the mistakes to avoid.
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RV Solar vs Van Solar: What's Different?
Sep 7, 2026 · 2 min read
Same system, different scale. What actually changes between RV and van solar builds.
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How Long Do LiFePO4 Batteries Last?
Sep 4, 2026 · 2 min read
3,000-5,000+ cycles — 8 to 15 years of daily use. Why lithium lasts, and what shortens it.
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What Is a BMS? Battery Management Systems Explained
Sep 3, 2026 · 2 min read
The silent guardian inside every good lithium battery — what a BMS protects against and why it matters.
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Lead-Acid to LiFePO4: What Else Must Change
Sep 3, 2026 · 5 min read
LiFePO4 batteries are sold as drop-in replacements. Physically they are. Electrically they are not, and the parts that must change are the ones nobody mentions on the product page.
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How Long Does a Van Solar System Last?
Sep 3, 2026 · 5 min read
A van solar system is five components that wear out at very different rates. The panels will outlast the van. The battery will not.
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Inverter/Charger Combi vs Separate Units
Sep 3, 2026 · 5 min read
One box that does both, or two boxes that each do one thing. The combi is neater. Separate units are lighter, cheaper and fail less annoyingly.
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Solar Cable Roof Entry That Does Not Leak
Sep 3, 2026 · 5 min read
Every solar install needs one hole in the roof. It is the only part of the build that can quietly destroy the van rather than the electrical system.
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Heated LiFePO4 Batteries: Do You Need One?
Sep 3, 2026 · 4 min read
LiFePO4 cannot be charged below freezing without permanent damage. There are three ways to solve that, and only one of them is a gadget.
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How to Wire a 12V Fridge in a Van (Fuse, Wire, Switch)
Sep 1, 2026 · 2 min read
Battery to fuse to fridge — the easy, safe way to wire a 12V compressor fridge.
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How to Reduce Power Consumption in Your Van
Aug 31, 2026 · 2 min read
The cheapest power is the power you don't use. Where the biggest van savings actually come from.
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Monocrystalline vs Polycrystalline vs Flexible Panels for Vans
Aug 30, 2026 · 5 min read
Panel choice for a van used to be a real decision. In 2026 it mostly is not. Here is where mono, poly and flexible actually stand on efficiency, warranty and price.
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Wiring Van Batteries in Parallel vs Series
Aug 30, 2026 · 5 min read
Two 100Ah batteries give you 200Ah at 12V or 100Ah at 24V. Same batteries, same cables, completely different system. Here is which to build and how to balance it.
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LiFePO4 Charge Settings for a Van (Absorption, Float, Time)
Aug 30, 2026 · 5 min read
Charge controllers ship with lead-acid defaults. Four of the five settings that matter are wrong for lithium out of the box, and none of them fail loudly.
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Battery Isolator vs DC-DC Charger: What's the Difference?
Aug 28, 2026 · 2 min read
An isolator just links batteries; a DC-DC charger charges them properly. Why DC-DC wins today.
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What Gauge Wire for Solar Panels on a Van?
Aug 27, 2026 · 2 min read
Too-thin wire overheats and wastes power. A quick gauge guide plus how to size it exactly.
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Van Solar for Beginners: Where to Start
Aug 25, 2026 · 2 min read
The whole system in plain English: panels charge a battery, your gear runs off it. Start here.
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Portable vs Rooftop Solar Panels for Vans
Aug 24, 2026 · 3 min read
Rooftop charges hands-free and while driving; portable lets you park in shade. Most builds use both.
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Solar Panel Specs Explained: Voc, Vmp, Isc and Imp
Aug 23, 2026 · 6 min read
A "100 W 12V panel" is neither 100 W nor 12V most of the time. The five numbers on the back of the panel decide whether your system works, and one of them destroys charge controllers every winter.
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Solar Panel Shading on a Van: Why One Shadow Kills Your Output
Aug 23, 2026 · 6 min read
Cover a tenth of a light bulb and you lose a tenth of the light. Cover a tenth of a solar array and you can lose a third of the power. Here is why, and what to do about it on a van roof.
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What Size Battery Do I Need for a Camper Van?
Aug 23, 2026 · 6 min read
Battery is the most expensive item in most van builds and the easiest to get wrong in both directions. Here is the sizing formula, a table by daily use, and the two constraints people forget.
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How to Winterize Your Van Solar and Electrical System
Aug 21, 2026 · 2 min read
Cold halves your solar and stops lithium charging. How to keep power flowing all winter.
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The Best Solar Setup for Full-Time Van Life
Aug 20, 2026 · 2 min read
Roughly 400-600W solar, 300-400Ah LiFePO4, a big inverter, and a DC-DC charger. Why each number lands there.
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Grounding a Van Electrical System: Do You Need It?
Aug 18, 2026 · 3 min read
Yes — bond the DC negative to the chassis at one clean point. What that means and why it matters.
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Solar Panel Tilt for Vans: Is It Worth It?
Aug 17, 2026 · 2 min read
Tilting boosts winter output 20-40% — but for most travelers, flat mounting plus more watts wins.
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How Many Solar Panels Fit on a Van Roof?
Aug 13, 2026 · 6 min read
Usable roof is 30 to 40 percent smaller than total roof. Panel dimensions, usable area by van model, what eats your space, and how to lay panels out around a fan.
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What Size Inverter Do I Need for a Van?
Aug 13, 2026 · 6 min read
Adding up everything you own gives you a 3000 W inverter for a van that needed 1000 W. Here is the correct method, including the battery current limit that stops most oversized inverters working at all.
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How Long Does It Take to Charge a Van Battery With Solar?
Aug 13, 2026 · 6 min read
Most charge-time answers online are about half the real figure. Here is the math with losses included, a full table by battery and array size, and the three things that make real charging slower.
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Peak Sun Hours by State: The Number That Decides Your Van Solar Size
Aug 13, 2026 · 9 min read
Peak sun hours, not daylight hours, decide your array size. Annual and winter figures for 22 US states and 9 countries, with the sizing formula and worked examples.
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Charging LiFePO4 in Cold Weather: The Freezing Rule Explained
Aug 7, 2026 · 3 min read
Charging lithium below freezing causes permanent damage. How the BMS protects it and how to charge through winter.
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Solar Generator vs DIY Van Solar System: Which Is Better?
Aug 7, 2026 · 4 min read
Plug-and-play power station or a cheaper, bigger DIY build? How to choose without overpaying.
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How to Wire a Van Solar System (Step-by-Step Diagram)
Aug 7, 2026 · 3 min read
The van solar power path, step by step: panels to controller to battery to loads, fused correctly.
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Best Battery Monitor for Van Life (Shunt Explained)
Aug 7, 2026 · 2 min read
Voltage lies. A shunt monitor counts every amp for a true battery percentage — the one gauge to add.
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Bus Bars, Fuse Blocks and Distribution: Van 12V Wiring Basics
Aug 7, 2026 · 2 min read
How bus bars and a fuse block turn a wiring mess into a clean, safe, per-circuit-fused 12V system.
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How Long Will a 200Ah or 300Ah Battery Last?
Aug 7, 2026 · 2 min read
A 200Ah bank holds ~2,048 Wh, 300Ah ~3,072 Wh — real runtimes and which size fits your build.
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Can You Run Air Conditioning on Van Solar?
Aug 7, 2026 · 3 min read
A van AC uses more energy in hours than your roof makes all day. The honest math and better options.
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Diesel Heater vs Propane Heater for a Van
Aug 7, 2026 · 3 min read
Diesel wins most builds — cheaper, drier, low battery draw. Where propane still makes sense.
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Starlink Power Consumption in a Van (and How to Cut It)
Aug 7, 2026 · 2 min read
The Standard dish averages ~50W — about 500 Wh a day. What it costs and how to cut it.
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How to Wire an Inverter to a Battery Safely
Aug 7, 2026 · 3 min read
An inverter pulls more current than anything else — thick cable, a big fuse at the battery, solid ground.
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Van Battery Types Explained: LiFePO4, AGM, Lead-Acid
Aug 7, 2026 · 2 min read
Four battery types, ranked for van life. Why LiFePO4 wins and AGM is the budget pick.
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How to Calculate Your Van's Daily Power Usage
Aug 7, 2026 · 2 min read
One formula sizes your whole system: watts x hours = daily watt-hours. A five-minute worked example.
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12V Compressor vs Propane Fridge for Van Life
Aug 5, 2026 · 3 min read
The fridge runs all day, so its type shapes your whole power system. Compressor vs propane, honestly.
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How Much Solar Does an RV Need? (Class A, B & C)
Aug 4, 2026 · 5 min read
Class B to Class A, sized from real daily loads — and the honest answer on running rooftop air conditioning from solar.
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What Size Charge Controller Do I Need? (MPPT Sizing)
Aug 4, 2026 · 4 min read
Amps = watts ÷ volts × 1.25, rounded up. Why the 1.25 matters, and the voltage limit that quietly kills controllers.
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Solar Panels for Van Life: How Many Watts You Actually Need
Aug 4, 2026 · 5 min read
Panels do not power your van — watt-hours do. The formula, the realistic ranges, and why winter doubles the number.
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Shore Power for Camper Vans: How It Works and What You Need
Aug 1, 2026 · 3 min read
Plug into an outlet to run appliances and charge your battery — the parts you need and the safety essentials.
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How to Mount Solar Panels on a Van (Rigid vs Flexible, Drill vs No-Drill)
Jul 29, 2026 · 4 min read
Rigid or flexible, drill or no-drill — how to mount a van solar array that survives the highway and stays leak-free.
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MPPT vs PWM Charge Controller: Which Is Best for a Van?
Jul 25, 2026 · 4 min read
MPPT captures 15-30% more from the same panels than PWM. Here's why, and the one time PWM is fine.
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Do You Need an Inverter in a Camper Van?
Jul 22, 2026 · 4 min read
Only AC appliances need an inverter. When to skip it, when to buy one, and what size to get.
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How to Charge a Van Battery While Driving (DC-DC Chargers Explained)
Jul 18, 2026 · 4 min read
A DC-DC charger turns engine time into power — the fix for modern smart alternators that won't charge your house battery.
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Van Battery Not Charging? 7 Causes and Fixes
Jul 14, 2026 · 5 min read
Most charging failures are a fuse, a loose crimp, or a settings mismatch. Diagnose yours in order.
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Van Electrical System Cost: Complete 2026 Budget Breakdown
Jul 14, 2026 · 4 min read
Three real builds itemized line by line — and the two components that eat 50% of every budget.
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What Can a 200W, 300W or 400W Solar Panel Run in a Van?
Jul 14, 2026 · 5 min read
Daily watt-hour budgets for each array size, from weekend fridge duty to full-time remote work.
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Solar Panels in Series vs Parallel: Which Is Better for a Camper Van?
Jul 14, 2026 · 4 min read
Same panels, same watts — different wire, controller, and shade behavior. How to choose.
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How Long Will a 100Ah Battery Last? (Real Van Life Examples)
Jul 14, 2026 · 5 min read
Real runtimes for every common van appliance on a 100Ah battery, with the simple math behind them.
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