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Resource Articles
Practical guides and field notes on solar ventilation, off-grid power, greenhouse growing, and homesteading — from the crew that has shipped 6,000+ solar fans since 2012.
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Convert CFM to PV/Battery for RV Solar Ventilation and Rural Buildings
Translate CFM and ACH into the right PV wattage and battery capacity for RVs and rural buildings. Practical PV to DC guidance, component choices, and...
Small Scale Solar Direct Drive Fans: Buy a Matched Kit for Daytime Use
A practical installation guide to solar direct drive fans for greenhouses, coops, and sheds. Size panels, wire systems, avoid DIY mistakes, or pick a...
10 Meters Cuts Risk: Code Backed Battery Safety for Barn Owners
A code backed battery safety playbook for barn owners: where to store and charge batteries, required ventilation and wiring rules, plus inspection and...
Size Greenhouse Ventilation for 1 Exchange/Min With Off Grid Solar
Compute required CFM from greenhouse volume using the one exchange per minute rule. Factor screens, pads, and canopy derates, then match AMCA fan curves...
Skip Trenching: Off Grid Well House Ventilation and CFM Fan Sizing
Seal the shell, then add calculated ventilation: thermostatic or solar fans sized by CFM. Includes heater and heat tape guidance, well-casing venting, and...
Growers, Stop Dead Zones: HAF Fan Placement With 10–15 ft Endwall
Set HAF fans 10–15 ft from endwalls, 40–50 ft apart and 7–8 ft high. Learn smoke tests, verify 50–100 fpm canopy velocity, and practical solar/DC kit tips.
DC Brushless Fans for Engineers: 50,000+ Hour Life in Off Grid Solar
For engineers: a practical explainer on DC brushless fans. Learn P Q curve matching, control choices, and how to specify 50,000+ hour fans for off grid solar.
Size Your Generator Shed Ventilation to 6 ACH With Solar Fans
Route generator exhaust outdoors, size CFM to 6 ACH, and choose solar fan kits for reliable off grid ventilation and lower CO risk.
Repeatable Test to Tune Battery Low Voltage Cutoff for RVs
Step-by-step method to tune your battery low voltage cutoff for RVs and off-grid systems. Includes a repeatable test, wiring checklist, and 11.8–12.2V...
25 kHz PWM: How Hobbyists and PC Builders Keep 4 Pin Fans Safe
A concise, practical guide for hobbyists and PC builders: set PWM on pin 4 near 25 kHz, share ground, and verify tach and MINSTART in BIOS or Linux.
Avoid a 50–70% Winter Drop: Cold Weather Solar for Off Grid Systems
Practical winter fixes for cold weather solar on off grid and under 3 kW systems: recheck cold Voc, set proper tilt and racking, size batteries, and plan...
MC4 Crimping: Stop Failures, 7.0 mm, 50 lb, 3.4 N·m for Hobbyists
Workshop-ready MC4 crimping for hobbyists and off‑grid installers. Follow the 7.0 mm strip, a 50 lb pull test, 3.4 N·m gland torque and four quick checks.