At a picnic, there is often a lack of household appliances powered by a 220 V network. By making such a battery, you can power it from it. A DIY battery like this also comes in handy if there are power outages, allowing you to avoid discomfort from this.
Materials:
- Compact batteries 3.7 V 20 Ah – 3 pcs. - http://alii.pub/601y36
- controller 3s 40A with balancing - http://alii.pub/601y11
- insulating tape;
- inverter (voltage converter) 12V DC-220V AC, 220 W - http://alii.pub/601xza
- voltmeter ammeter - http://alii.pub/601y3y
- mounting box;
- power button - http://alii.pub/5mk6b7
- charging connector - http://alii.pub/5mk6b7
- fan 12V - http://alii.pub/601y5p
Battery assembly process
To make a powerful yet compact lightweight 12V 20Ah battery, you need to connect 3 3.7V 20Ah batteries together. Ideally, if funds allow, use lithium iron phosphate batteries.
The batteries are wrapped with heat-resistant electrical tape.
The controller is glued to the side of the battery pack.
The batteries are connected in series to raise the total voltage to 12V and connected to the controller.
Let's isolate.
Next, we take the inverter and disassemble it.
You need to disconnect the socket and liner from it. Next, drill holes in the radiator housing.
Then you need to select a mounting plastic box in which the batteries and inverter will fit. Windows are cut into the box for mounting a voltmeter with an ammeter, a button and a standard socket from the inverter.
Next, ventilation holes are drilled in it.
A fan is installed opposite them. Holes are needed on the opposite wall so that the forced air can pass through.
All equipment is installed in the cut-out windows.
An inverter is screwed to the bottom, and batteries are installed on the side.
Next, the components are soldered.
Drill a hole in the lid of the box for the charger connector.
It connects to the controller.
For convenience, it is better to connect the wires using terminal blocks, if space allows. Thus, we get an external power supply of 220 V, with a voltmeter and ammeter to control charge and discharge.
It is charged with a regular 15-19 V power supply, for example, from a laptop. The device is turned on with a button.
It can be used to power anything within the rated power of the built-in inverter.
There is enough power even for a power tool.
