A complete Jack-of-all-trades set. For DC part - LM Compared to more commonly sold mains-powered units, this one has an advantage of being able to heat water during power outage. When you've got it all, you may begin assembly: Buy two D to AA adapters from China: A project box where you'll cram all stuff I mentioned above. That's the easiest way I found to get a waterproof connection. Stretch the wire from some dry corner where you'll plant your electronics to the gas heater. Let's prepare the batteries.
That's what you'll need to do: Craft two fake batteries from two pieces of wire and battery adapters. All sorts of electronic trifles like electrolytic and ceramic capacitors, wire-to-board connectors etc This connection will be splashed on, that's why I connected the wires submarine-style: Typical battery-powered tankless gas heater, bottom view. Our patient old tankless gas heater powered by two D-type batteries like those: If your batteries, like mine, came with spring-loaded contacts, you can try to avoid making them ugly after soldering wires directly to terminals, and make a male connectors from a piece of a copper bus for them: This completes the modifications part. Plug the modified adapters into the battery compartment. Let's proceed to the schematic of our mini-UPS. There batteries are charged from two 5V PSUs, and buck converter converts their combined voltage to 3. What are we waiting for, let's start! That's the easiest way I found to get a waterproof connection. To make those holes, I found conical drill bit and very sharp hobby knife very handy. Gas heater modifications Since I live in a rented apartment, I did not want to modify the heater in any visible or irreversible way. When you've got it all, you may begin assembly: Connect the remaining wires to the battery modules, then hot glue the charging circuit to each module: Compared to more commonly sold mains-powered units, this one has an advantage of being able to heat water during power outage. Bearing that in mind, all improvements I made were minimally invasive. Being a lazy bum just as I am, one day I decided to overcome this disadvantage and make my heater work from mains, retaining the advantage of autonomy from power grid. The output of our uninterruptible power supply will be connected to them, eventually. Mains voltage is to be connected to them - the ability to simply join the wires with your bare hands will come in handy when you'll be installing this box to some remote dusty corner. Connect the adapters with the twisted pair. No crimping, screwing, etc Let's prepare the batteries. I used a twisted pair, and I advise you do the same to avoid crosstalk.
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