ECO-WORTHY 400W Solar Panels 4pcs 100 Watt 18V Monocrystalline Solar Panel Module for Off Grid PV Power for Home, Camping, Boat, Shed Farm, RV,12V Battery,2-Pack 2 * 100W

is a "DIY/semi-professional" level panel/kit that is positioned as economical, with good assembly equipment, with quality frame and glass materials, and designed for off-grid, farm, light house, etc. uses. Aluminium frames wider than usual (35 mm vs ~30 mm) which improves stiffness. Low-iron 3.2 mm glass that improves light transmission and resistance. Good wind and snow resistance in field trials. "high conversion efficiency" and good performance even under suboptimal conditions.

I ordered 8 of these. 6 arrived a bit late (UPS Issue) the last 2 were delayed and then marked refused by me... Called UPS long story short UPS damaged them while shipping. Contacted Eco-Worthy and explained what happened. 3 days later the other 2 panels arrived. This was including a Sunday! Easter Sunday to boot! The panels arrived before I was even able to get the tracking number! I waited until Monday to ask for that. I am so impressed with their customer service! The panels are in excellent shape, appear to be great quality. I will get to test them out this weekend. My initial tests of all the panels show they are in good working condition.

The panels work and were not damaged, my only worry is that they aren’t secured very well where the leads come from, but as of now they work just fine. These are my first panels so I might be skeptical over nothing. I do plan on getting more though, great price.

Very pleased. They work.

They seem to work well. I believe they may get more than 18v sometimes though.

In answer to the question of “why are my solar panels underperforming their rated capacity” I have some information that you might find useful. The rated capacity of these 4 panels is 400 watts. You probably already know that panel angle and whether the weather is sunny or cloudy can have a effect on power output. What you may not know is that how you connect your solar panels to the power station can also have a huge effect. My power station is rated at having 500 watts maximum solar input power so I assumed that I should have no problem connecting it to 400 watts of solar panels, but my power station has maximum solar input voltage of 60 volts and maximum solar input current of 15 amps. Each of the 4 solar panels has normal output voltage of not more than 12 volts but a peak output voltage of 19.5 volts and peak output current of 8.33 amps. If you connect the panels in parallel (positive of one panel to positive of the next panel and negative to negative of the next panel), the peak output voltage would stay at 19.5 volts but the peak output current would be 33.32 amps which exceeds the input current capacity of the power station. The power station would reject the current over 15 amps, so power output would be reduced by a little more than half and the excessive current could damage the power station. If you connect the panels together in series (positive of one panel to negative of the next panel), the peak output voltage of the 4 panels would be 78 volts and the peak output current would stay at 8.33 amps which exceeds the input voltage capacity of the power station. Power output would be reduced by about a quarter and you would again risk damage to the power station. In this example, I should be able to maximize power output by connecting the panels in series using a solar power controller. There are two types of solar power controllers, PWN and MPPT. PWN controllers are cheaper but they only reduce the voltage without a corresponding increase in the amperage so you lose power output. The MPPT controllers cost more but they increase amperage as they decrease voltage with no loss in power output. I have ordered an MPPT controller and am optimistic of getting optimal power production.

Upgrading my 26 foot shuttle bus up to 1600 W. And then I'm going to have another 800 W on my trailer, which I can piggyback onto the 1600. Very strong, reliable.

This was a no-brainer of a purchase. Easy to install, very reasonable price, and keeps my auxiliary power system charged very reliably. I got the brackets to screw them down to my roof, but it's a flat roof, and it doesn't get very windy where I live. so I just set them there and ran the cable down from them, and they've worked fine ever since.

Función bien desde que lo instalé, no había instalado ninguna placa solar en la vida pero es un sistema sencillo. La única pega es su robustez, es un tanto débil, hay que amarrarlo bien con soportes adecuados o con lo que construyas tu mismo.

Ich benutze zwei dieser Solarzellen auf meinem Wohnmobil, um auch mal autark etwas machen zu können, ohne dass in Kürze die Bordbatterien leer sind. Dies funktioniert in Kombination mit einem Solarladeregler auch problemlos! Im Sommer braucht man im Normalfall keinen externen Stromanschluss und im Winter verhindert der Laderegler die Entladung der Batterien. Völlig brauchbar, diese Zellen!!!

Product as described. Still working several years after purchase

Al momento non sono soddisfatto delle prestazioni, ma la cosa che più mi ha urtato è stato scoprire che il coperchio della scatola di giunzione era semiaperta con la guarnizione che tagliava in diagonale la scatola stessa, per fortuna non ha piovuto altrimenti addio all'impermeabilità... Comunque al momento la corrente massima che il pannello eroga con il sole che picchia al massimo (ore 13:30 del 30/09/2019) è di 1,4 Ampere --------- Aggiornamento Recensione (ore 10:45 02/10/2019), a causa della batteria già carica, ovviamente il modulo fotovoltaico non poteva erogare più potenza. Dopo aver scaricato la batteria giusto quanto basta, oggi ho potuto apprezzare una corrente di carica di 4,8 ampere quindi presumo dato l'orario e la stagione che il modulo funziona perfettamente.

Très bien, fonctionne à merveille depuis mon achat , il équipe mon garage et fournis du courant même par temps couvert