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Hey everyone, I have a dilemma, I'll send photos of the setup currently, but I am basically taking this as an opportunity to also run some tests. I have a tank without any access to power and I need it to run efficiently off of a battery backup for weeks-months. If there isn't a reliable solution for the problem, then I will likely have the tank in place waiting for construction to finish up. Currently: 1 sponge filter running off 2 D-Cell batteries. 1 sponge filter running off nano USB air pump connected to a 2000 mAh battery bank I can run one of these off a gang valve but it is not enough to run both sponges. If need be I can remove one. I am considering getting some of the higher output battery backup ACO air pumps, but I do have a few question and issues I need to understand fully. 1. How long will the battery bank last, even if I swap it every few days that is a potential solution which can potentially increase the battery life of bank? -->Essentially, run it down to 35%, charge it back up to 80%, rinse/repeat to increase cycle of the Lithium Ion batteries. 2. Part of the issue I am having is AC-->DC (Battery)-->AC conversion for the devices. If I have something like a UPS, you only have it operate for a few hours, not even 24, because of the battery being drained by spending so many resources converting the energy to different I/O options. With the battery bank, I don't think this is an issue, but I do need to confirm operation. (Input = USB, Output = USB) 2A. This brings into question the viability of the nano usb pump in comparison to the ACO air pump. The nano pump is designed to run off of low DC voltage for a very long time at low wattage. I assume there is some loss based on what I am already experiencing. What concerns me is that if I upgrade from something that uses 3.5w vs. 0.3w is this input loss negated or am I adding to the loss because the power is now converting from DC (battery bank) --> DC (pump battery) --> Output and requiring more current? The ACO pump is designed to run off that 5V input, which may dramatically drain the bank itself much easier because the circuit is a bit more complex. I can't find the resource, but I think Cory and others have mentioned the nano pump can last anywhere from 4-14 days depending on the battery you're using. I just don't really know what the threshold here is for the other pump and I don't really have any good barometer given the integrated battery complicating the circuit slightly. Thoughts? Edit: I found some wiring diagrams for the battery bank itself. It's purely DC-->DC and the only real issue is the resistor used to step up voltage, relating to the loss that provides the system in low power modes. https://www.electronicsforu.com/electronics-projects/power-bank-circuit

Snagged a few D-cell pumps recently, what with hurricane season coming up, and I tested one out and WHOA! It is LOUD! Anyone have any tips on dampening that? I wrapped 2 hand towels around it and it didn't seem to make a difference. Last hurricane we were out of power for 3 days and I can't imagine listening to that for that duration.