With relatively fast charging speeds, the Renogy 15,000mAh is a capable, compact panel that can keep devices going over a long weekend or when traveling.
The Renogy is shown here charging our Kindle while car camping.
Charge Interruption Recovery
This rating metric is a bit challenging to apply to small battery packs with integrated panels, like the 15,000. To attempt to use this battery pack as you would, a traditional solar charger would result in frustration, as a 2W panel doesn't have the same charging capabilities as a 40W panel. We found it best to trickle charge the 15,000 via the power of the sun, when we were able to leave it out for hours. When taking this approach, charge interruption isn't an issue because your device will always be getting power from the battery itself, which is, in turn, getting refilled from the sun.
The size of this panel equates to slower charging times, even in the most optimal solar conditions.
The manufacturer recommends over 75 hours of sun exposure to charge this battery. This information is good to keep in mind when considering the Renogy, as solar is more of a back-up method of charging. We found it best to charge the battery at home fully and then rely on solar power to trickle charge our devices when out and about. That said, the Renogy does charge quite fast, and it charged up our Google Pixel 3 phone from 0% to 23% in 30 minutes; we also got five full charges out of the Renogy before draining the battery.
The Renogy was efficient when charging this small lantern - another reason why this panel is a great addition to any car camping trip.
Multiple Device Charging Speed
With 15,000mAh of power, the 15,000 from Renogy has no trouble charging two devices at once, as long as the battery is mostly full. We were able to charge our Pixel 3 and a Kindle a decent amount (the phone 5% and the Kindle 9%) over a half-hour period.
Here, we utilize both USB ports on the Renogy to charge up our devices in the middle of the day with optimal solar conditions.
We were impressed with the durability and construction of the Renogy. The hard plastics used in the construction seem to be a little bit less durable than the battery packs that are encased in soft silicone. That said, we had no issues when it came to the durability of this panel, even when leaving it in the sun for hours.
The Renogy is decent when left sitting in the sun for long periods of time, but more efficient models can be found in our fleet.
Weight and Portability
It is in this metric that the 15,000 stands out against its competitors. Weighing in at 9.5 ounces, the Renogy is the lightest of the three battery pack/solar chargers in this review. It combines excellent output power with a lightweight, sleek profile, making it our go-to for a battery pack with an integrated solar panel.
The Renogy 15,000mAh is a great panel to bring traveling - it kept our small devices charged without taking up too much space in our kit.
The 15,000 is a reasonable investment if you are looking for a battery pack. We would recommend buying this product if you plan on fully charging it indoors and using the solar panel as a trickle-charge function. Don't buy this panel expecting it to charge your devices in the sun at a rapid rate.
The Renogy is about the size of a small journal or book, making it quite portable.
Its simple design, charging ability, and low overall weight makes the Renogy 15,000 our go-to for a small, portable battery/panel combination, as it kept our devices charged on train rides and in the airport. Like the other battery pack/panels in this review, it takes a significant amount of time (over five hours) to see any increase in battery level using only the solar panels, but it is effective to trickle charge devices with the panel in the sun. It is also reasonably priced and durable, making it a good purchase overall.