Sometimes I have multiple batteries I want to charge, but I don't want to charge them all simultaneously. There are three scenarios for this:
- My power source isn't strong enough to charge all the batteries simultaneously. For example, maybe I'm off-grid using a small inverter. Charging batteries sequentially rather than all at once
- I want to keep several gadgets with batteries charged above 20%, but I want to avoid keeping them all at 100% in order to maximize their longevity.
- I am connected to the grid but I'm trying to minimize my peak demand because I'm paying a peak demand tariff.
All my batteries have their own AC adapters, so I'm looking for something like a 120V power bar that has smart control of the outlets.
Is there anything on the market like this? I'm not even sure what to call this product category. I know there are "smart" power bars, but they mostly seem only useful for remote control, and that's the opposite of what I'm thinking of here (I want something that works unattended.)
Ideally I'm looking for something that can do any/all of these functions:
- Ensure that only one power socket is energized at a given time. (Software developers describe this as "mutual exclusion")
- Keep one socket energized until the power demanded drops below a threshold, then automatically energize the next socket.
- rotate power to each socket on a timed schedule anywhere from minutes to days. (Bonus if the schedule can also be programmed with intentional blackout windows.)
If there is no product like this on the market, what would be a reasonable way to DIY something like this?