I installed this in a Humvee/M998 for battery servicing combined with an external 120v socket to plug into. It's been a month and I seem to be doing fine. I hear a slight hum from the fan when it's plugged in, so I know it's working. I monitored the power consumption with an ammeter in front of the power strip. It doesn't exceed two amps, but that doesn't surprise me since the batteries are fairly new. I was concerned when I bought it because it's very light. If you're expecting something like NOCO, that's about half the weight. It does what I want, automatically detects the voltage and keeps the battery running at peak performance. The only reason for 4 stars isn't the performance, it's just the cheap feel. At this point I would buy it again for my application. The price of a 24V charger is unbeatable. I will update the review if I encounter any issues.
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