Solar & Off-Grid Power

How to shop for solar and off-grid power online

Start with a load list. Add up the watts of everything you will run and the hours per day, which gives you daily watt-hours. A 12V 100Ah battery holds about 1,280Wh; a LiFePO4 battery can use roughly 80 to 100 percent of that, while lead-acid should stay around 50 percent. Size the battery bank for one to two days of use, then size panels to refill it in your winter sun hours, not summer.

LiFePO4 checklist. Look for the BMS current limit (it caps how much you can pull continuously), low-temperature charge protection if the battery lives in a cold RV or cabin, and the stated cycle life at a given depth of discharge. Check whether batteries can be wired in series or parallel and how many, since some models allow parallel only. For home backup, 48V server-rack batteries keep currents lower and cables thinner than 12V systems.

Panels and charge controllers. Panel output in real sun is commonly 70 to 85 percent of the rating. MPPT controllers harvest noticeably more than PWM, especially in cold weather or with panels wired in series. Flexible panels suit curved RV roofs and boat decks but run hotter and usually degrade faster than rigid framed panels.

Inverters. Pure sine wave is the safe choice for anything with a motor or sensitive electronics. Check continuous rating, not peak, against your largest load, and make sure the inverter input voltage matches your battery bank.

Solar lighting. Ignore the wattage in the title. Compare lumens, battery capacity in watt-hours, panel wattage and rated nights of autonomy. A light with a small panel and a big lumen claim will run bright for a few hours and then dim.

Freight, returns and warranty traps. Large kits ship by freight, which can take 5 to 14 business days, so inspect pallets on arrival and report damage fast; ECO-WORTHY asks for damaged or wrong items to be reported within 14 days. Change-of-mind returns on heavy batteries mean you pay return shipping, which can be expensive. Modifying a battery or kit usually voids the warranty, and extended coverage on items like high bays may come with per-claim fees.

Budget tiers. A single 100Ah LiFePO4 battery and a 200W panel make a weekend RV or shed system. Whole-cabin kits with a 3kW inverter and several kWh of storage run into the thousands. Home backup at 48V is a larger project where a licensed electrician should sign off on the install.

Which brand fits which buyer

• RV, van and boat owners swapping lead-acid for 12V LiFePO4: ECO-WORTHY.
• DIY home backup builders wanting a 48V rack battery and inverter from one seller: ECO-WORTHY.
• Homeowners and farms lighting driveways, barns or fence lines without running power: Langy Solar Lighting.
• Shop and garage owners upgrading to LED high bays, or anyone after a solar attic fan: Langy Solar Lighting.