Question 1

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

Accepted Answer

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.

Question 2

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

Accepted Answer

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

Question 3

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

Accepted Answer

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.

Question 4

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?

Accepted Answer

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.

ASIN	B09H6GGK55
Amperage Capacity	2.1 A
Best Sellers Rank	#6,090 in Cell Phones & Accessories ( See Top 100 in Cell Phones & Accessories ) #5 in Cell Phone Solar Chargers
Brand Name	FlexSolar
Connector Type	USB Type A, USB Type C
Customer Reviews	4.4 4.4 out of 5 stars (1,295)
Efficiency	High Efficiency
Folded Size	8,14x11,1x1,73 pollici
Included Components	2* Carabiners, 40W solar chargers
Item Dimensions L x W x H	48.8"L x 11"W x 0.1"H
Item Type Name	Foldable Solar Panel
Manufacturer	FlexSolar
Manufacturer Part Number	FLC-E6-200400-
Material Type	ETFE
Maximum Power	40 watts
Maximum Voltage	20 volts_of_direct_current
Model Number	E40
Number of Items	1
Output Voltage	19 volts_of_direct_current
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
UPC	785249519352
Unit Count	1 Count

FlexSolar 40W Foldable Solar Panel Charger, USB-C USB-A & DC Outputs

Details

Details

Description

Specifications

Common Questions