Say goodbye to guesswork and unhelpful forum posts. In short, ManualsFix gives makers, van lifers, and technicians instant sizing calculators with zero bloat and 100% private in-browser computation.
Verified against NEC 310.15, NREL PV irradiance models, and ISO additive manufacturing standards.
| Tool Name | Category | Underlying Engineering Standard | Authoritative Reference | Direct Action |
|---|---|---|---|---|
| Solar Panel & Battery Sizer | Solar & RV | NREL Peak Sun Hours & Wh Load Profiling | Wikipedia Solar Irradiance ↗ | Launch Tool → |
| Wire Gauge & Voltage Drop | Solar & RV | NEC Chapter 9 Table 8 & ABYC E-11 (≤3% drop) | Wikipedia AWG ↗ | Launch Tool → |
| Battery Bank & Autonomy | Solar & RV | LiFePO4 80% DoD & Temperature Derating | Wikipedia LiFePO4 ↗ | Launch Tool → |
| Inverter Sizing & Surge | Solar & RV | UL 1741 & Continuous Inverter Thermal Derating | Wikipedia Inverters ↗ | Launch Tool → |
| MPPT Charge Controller | Solar & RV | Cold Temperature Voc & IEEE 1547 Standards | Wikipedia MPPT ↗ | Launch Tool → |
| 3D Print Cost & Price Quoter | 3D Printing | 4-Pillar Quoting Model ($/g, kWh, Depreciation) | Wikipedia 3D Printing ↗ | Launch Tool → |
| Filament Length & Meters | 3D Printing | ISO/ASTM 52900 & ASTM D792 Density Models | Wikipedia 3D Printing ↗ | Launch Tool → |
| CNC Feeds & Speeds Sizer | Fabrication | Machinery's Handbook Chip Load & SFM Formulas | Wikipedia Speeds ↗ | Launch Tool → |
We build free tools to help you design off-grid solar kits and tune 3D printers.
You can size solar panels, check wire gauges, and pick the right battery bank in seconds.
You can also track 3D print costs, filament weight, and cut speeds for CNC jobs.
We help you pick the best wire for your campervan solar power.
You can calculate voltage drop on long wire runs to keep your gear safe.
You can see if your battery has enough amp hours to run all night long.
You can test run times for lead acid and lithium iron cells.
You can check safe feed speeds for wood, brass, and plastic on your CNC mill.
Makers can estimate filament cost before starting a long print job.
You can calculate your true profit on parts you make and sell to clients.
All tools use clean math tested in real workshops and overland rigs.
We built these tools for our own field rigs.
We share them with makers to make clean energy simple.
We love tools that work well and save you cash.
Our goal is to make DIY solar and 3D print math easy for all.
You can get fast answers to build your dream rig.
We keep all formulas up to date so your builds stay safe.
Every tool runs right in your web browser. There is no signup, no login, and no paywall.
Your project data stays safe on your own device. We do not store or sell your work.
You can use these web apps in your van, on your boat, in your shop, or in the woods.
They work fast on phones, tablets, and laptops even when you have no cell signal.
Dedicated tools calibrated to industry standards and manufacturer specifications.
Everything you need to design safe, efficient mobile electrical systems for campervans, overland rigs, sailboats, and remote cabins.
Precision utilities for makers, 3D print farm operators, Etsy sellers, and desktop CNC enthusiasts looking for accurate metrics.
In-depth calculation walkthroughs, formula derivations, and benchmark comparison charts.
Direct empirical answers to common calculation questions.
To calculate your solar panel needs, first sum your daily appliance watt-hours. Divide that total by the average peak sun hours in your area. Then multiply by a 1.25 safety factor to account for system wiring and charge losses.
To calculate 3D print costs accurately, combine raw filament cost by weight, electrical power use during print time, machine wear cost per hour, and your shop profit rate.
Low voltage DC systems carry high electrical currents that cause voltage drop and wire heating over long cable runs. Proper copper wire gauge sizing prevents fire risks and keeps inverter operating voltage stable.
Solar insolation refers to the total amount of solar energy that strikes a given surface area each day, measured in peak sun hours per square meter.
Chip load is the thickness of material cut away by each cutting tooth of a CNC router bit during one full turn.
Battery autonomy refers to the number of full days an off-grid battery bank can power all loads without any solar charging.
Too many online calculators use arbitrary rules of thumb that leave your solar battery drained or snap your expensive CNC end mills. Our tools are built strictly on published empirical formulas, National Electrical Code (NEC) tables, NREL insolation data, and raw polymer density ratings.
In our experience, hands-on field builds, and shop tests where we measured real battery run times and we tested tool loads, empirical math prevents costly hardware damage. All formulas are fact-checked and reviewed by licensed engineering specialists. Review our Editorial and Verification Policy →
No user data is collected or sent to a server. Instant recalculation in milliseconds.
Based on ABYC E-11, NEC 310.15, and real polymer specific gravities.
Designed for real-world field work inside your van or next to your 3D printer workbench.
Everything you need to know about our engineering formulas, data privacy, and offline use.