Perhaps more annoying than fan noise during charging though is the fan noise during discharge or use. It does ramp down at lower charge rates, but even on its lowest setting of 200 watts, it will run the fans and hit about 50dBA. When charging at the unit’s maximum 1,200 watts, the fans kick on at full speed. Even worse, it’s a small-fan, shrill 57dBA. Under high charge rates and high discharge rates, the Delta 2’s two fans spin at very high RPM, which we measured at 57dBA three feet from the unit when the fans were on. We can’t review the Delta 2 without mentioning one of the things that bugs us the most about it: the fan noise. Under its full charge rate, the Delta 2 runs two small fans at shrill speeds to keep the charge circuit and batteries nice and cool. We’ll get to the fan noise discussion below. The lower capacity may be due to the efficiency of the inverter under higher loads, how the battery discharges under a much heavier load as well, and additional power use by the Delta 2 such as its loud fans. Under heavier loads of 800 watts, we saw the capacity drop to 71 percent, however. The DC output was 828 watt hours, or basically 80 percent of its rated 1,024 capacity. Under actual use, most small laptops can use from 5 watts to 30 watts. That’s the typical maximum charge rate for a small laptop if it were dead. Since the output rates can be different whether you’re discharging over AC or DC, we also ran the Delta 2 down over its USB-C port with load set to 20 volts at 3 amps or 60 watts. Results for both the 200-watt bulb runs reached 80 percent of the Delta 2’s 1,024Wh-rated capacity. For that we plugged a watt meter into the AC port and measured the energy output using a 200-watt incandescent light bulb and a small space heater drawing 800 watts. Gordon Mah Ung EcoFlow Delta 2: Performanceįor capacity testing, we fully discharged the Delta 2 twice to condition the battery and then charged it to 100 percent for run-down tests. The rear of the Delta 2 features six AC ports, two 5.5mm DC ports, a “cigarette” power adapter as well as the AC plug to charge the unit and an XT60 port for a solar panel. Or stick with an EcoFlow-branded setup to be sure. If you go this route, pay careful attention that the voltage of your solar panels remains below the Delta 2’s limit of 500 watts. The solar ports continue to be based on the fairly common XT60 connector so you can connect aftermarket solar panels to it if you want. EcoFlow has moved the AC and solar charging ports from the side of the unit to the back on the Delta 2. The Delta 2 doesn’t change much externally from the original model, with handles on both ends that are strong enough to lug around the 27 pound power station one-handed if you need to. Similarly, fans, refrigerators, and most other household equipment doesn’t mind losing power for a fraction of a second. This doesn’t impact laptops, which have a battery to rely on while power is switched over. The 30ms is simply too slow for most desktop PCs to not immediately reboot with the Delta 2. On most desktops following the ATX specification, a PSU can go 16ms before power is lost to the system. That’s because the Delta 2 takes 30 milliseconds to take over once power has been cut. In truth, that would work with a laptop, but probably not a desktop. In fact, with that many charges cycles, you might even consider using it as an ad-hoc UPS for your PC, keeping it plugged in full time. But going from 800 charge cycles to 3,000 thanks to the lithium iron phosphate chemistry is understandably very attractive to many people.
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