How many amps is everyone getting? i'm getting 1.6a via usb on the 40w solar version. how can i hit 2.1a?

What most of the reviews say is that you'll rarely hit 2.1a and it's also inconsistent with clouds, etc. And every time you drop below 2.1a, your phone, tablet may stop charging which could require you to unplug/plug back in to restart charging. The best way to solve this is to use the solar panel to charge a battery bank which will take whatever it can get from the solar with little fuss on amperage. Then use the battery bank to charge your phone as it provides the consistent 2.1a your phone/tablet needs. Many battery banks will not simultaneously charge (solar/wall plug) and discharge (phone/tablet), but if needed find one that has "pass through" charging.

Does solar panel have reverse voltage prevention capability to prevent draining the battery of the item being charged?

It seemed to drain my phone. 2 percent battery loss in a second all at once.

Can 3 of these FlexSolar 40W solar chargers be tethered for even more power wattage?

If by tethered you mean daisy-chained, then the answer is no. This is not like the permanent or some of the bigger 100w solar panels designed to be daisy chained for higher wattage. That doesn't mean there isn't a way to use multiple units, but that really depends on what you are trying to power. And that is the biggest question, what are you trying to charge that takes or needs 120watts? You might be better off looking at a higher end panel set.

I am going camping in the desert for a week and am looking for a way to charge a mini air cooler. Would I need a power bank also?

FlexSolar 40 watts solar charger panel can only be used in the sunlight and No function of storing electricity. If you want to use the electricity in the night, you can buy a power bank.

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FlexSolar 40W Foldable Solar Panel Charger with USB-C and USB-A Outputs for Phones, Power Banks, Tablets - Waterproof for Camping, Hiking, Backpacking

FlexSolar 40W Foldable Solar Panel Charger with USB-C and USB-A Outputs for Phones, Power Banks, Tablets - Waterproof for Camping, Hiking, Backpacking

Product ID: 399175217

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Details

Brand
FlexSolar
Material
ETFE
Product Dimensions
48.8"L x 11"W
Efficiency
High
Included Components
2* Carabiners

⚡40W max power output

💧IP67 waterproof & dustproof durability

🔋Dual QC3.0 USB-A & PD2.0 USB-C fast charging

Description

☀️ Charge smarter, adventure farther — never miss a moment off-grid!

POWER UP ANYWHERE - 40W foldable solar panel delivers reliable energy on the go, perfect for camping and emergencies.
BUILT FOR THE WILD - 24% high-efficiency monocrystalline cells with IP67-rated weatherproofing keep you powered through rain, dust, and abrasion.
SMART SAFE CHARGING - Integrated IC chip optimizes power delivery and protects against overcurrent, overheating, and short circuits.
ULTRA LIGHT COMPACT - Weighing just 1.76 lbs and folding to a compact size, it fits effortlessly in your backpack for ultimate portability.
DUAL FAST CHARGE PORTS - Simultaneously charge phones, tablets, and power banks with QC3.0 USB-A & PD2.0 USB-C ports for max speed.

The FlexSolar 40W Foldable Solar Panel Charger combines cutting-edge 24% efficient monocrystalline cells with dual fast-charging USB ports (QC3.0 USB-A & PD2.0 USB-C) and a 19V DC output. Its ultra-lightweight, foldable design (1.76 lbs) and IP67 waterproof rating make it the ultimate portable power solution for outdoor enthusiasts and emergency preparedness, delivering safe, optimized charging anywhere under the sun.

Specifications

Brand	FlexSolar
Material	ETFE
Product Dimensions	48.8"L x 11"W x 0.1"H
Efficiency	High Efficiency
Included Components	2* Carabiners, 40W solar chargers
AC Adapter Current	2.1 Amps
Maximum Voltage	20 Volts (DC)
Maximum Power	40 Watts
Special Feature	Foldable & Portable, High Energy Conversion, Lightweight Design, Quick Charge QC 3.0 USB-A ,USB-C PD2.0 and DC ports, Smart IC Technology
UPC	785249519352
Output Voltage	19 Volts (DC)
Manufacturer	FlexSolar
Part Number	FLC-E6-200400-
Item Weight	2.27 pounds
Item model number	E40
Size	40 W
Color	Black
Style	Traditional
Power Source	Solar Powered
Wattage	40 watts
Item Package Quantity	1
Folded Knife Size	8,14x11,1x1,73 pollici
Mounting Type	Table Stand
Certification	FCC
Special Features	Foldable & Portable, High Energy Conversion, Lightweight Design, Quick Charge QC 3.0 USB-A ,USB-C PD2.0 and DC ports, Smart IC Technology
Batteries Included?	No
Batteries Required?	No
Battery Cell Type	Polymer

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