This project goes over the conversion of an old three way refrigerator unit from an RV into an alternative power offgrid Dual refrigeration system that uses no electric power. This can be really useful in case of a power outage or SHTF situation when you need to keep your food or vegetables fresh.
The first step is to strip the fittings on the back side of the fridge , remove all the ammonia system ,clean the inside of it .
Here we are incorporating more than one way to use this water for cooling refrigeration system to make it efficient .We will be using cooling effect by brining down the water temperature to cool the box , another way to cool the box is by installing an evaporative system. We take the two pipes coming from the water source around the edges of the box and put some cotton sheets around the sides and let the water cascade down the sheet creating an evaporative effect.
We have an inverter and a battery attached to the fridge that is hooked up to a 25W solar panel .The wire from the inverter is connected to 8W Electric Fish tank pump .The water coming from the pump goes underneath and up inside to the lid of the fridge to the condenser coils and then comes back around back into the water source like well or water tank. The full system is recirculated back into the original storage tank where the water is coming from.
We keep the fridge in a chest freezer style instead of an upright style. Inside the fridge, we have incorporated 2 poly tubing coils attached to an old heat sink that was already in the fridge. The 100ft coils are attached to the top of the fridge. The cold from that coils will drop down to the rest of the fridge.
Next step is to incorporate the evaporative cooling part of the refrigeration system. We start by installing aluminum U channels across all the edges of the fridge. The U channel will hold cotton material inside of them. The water coming out of the outputs from our coils rushes into the channel which is going to wick out into the cloth and run down the cloth with gravity, giving us our evaporative cooling effect .
On the corners, we have the U channels interconnected to each other through a bent garden hose in such a way that any extra water flow in the channel can transfer to the the channel that is next.
The cotton sheets are stretched around the box and tuck it down into the channels all the way around under the wires such that the wires will hold the channels up and hold the sheet up inside the channel. To even the flow of the water ,we install a tee. Now the water coming from both sides of the channel can leak into the sheet. Also make sure you have an air gap between the sheet and the refrigerator box.
- How to build a Homemade Water Powered HHO Dry Cell GeneratorThis project goes over the build of a Homemade 19 Plate HHO Dry Cell Generator . The HHO generator works by the principle of electrolysis. Water is made from two types of atoms hydrogen and oxygen. Electrolysis is a method for splitting water into hydrogen and oxygen. Pure water isn't electrically conductive, so we add either sodium hydroxide or potassium hydroxide to it to make it conductive. To make the electrolyzer , we need electrode plates, neutral plates, gaskets, front and back plates with some metal reinforcements . The electrode plates and the neutral plates are made of 304 stainless steel sheets, the gaskets made from one eighth inch neoprene rubber sheet. The neutral plates are stacked in between the positive and the negative plates .The empty spaces are filled with neoprene gaskets. Water comes into the electrolyzer through the input tube and goes out as hydrogen and oxygen through the output tube. When electricity is applied to the electrodes, the chemical reaction occurs, which causes the hydrogen from the water to go to one plate and the oxygen to the other plate where there they form bubbles of gas .Now the electricity wants to jump from the negative plate to the positive plate but since we have neutral plates between them, they divide the original voltage. This help in efficient HHO gas generation. The plates are made of 12 X 12 .24ga 304 stainless steel sheets that is cut into four 6 inch pieces using tin snips . The plates are stacked together and holes are cut top and bottom for where the gas and the water comes in and leaves. To hold the plates together use seven inch cutting boards with metal support frames at both ends. To differentiate between neutral plates and the electrode plates, we cut both corners of the neutral plates and only one corner of the electrode plates. So this way we can run a bolt from the positive to the other positive and negative to other negative end. To assemble the cell, we place onto the base cutting board, the positive electrode plate and stack the neutral plates and the gaskets on them one by one and enclose them the negative electrode plate and the base board .Secure them with bolts on four corners. The electrode plates are then connected to each other with a thin gauge wire. The next component for the build is some sort of a water reservoir. The reservoir is nothing more than a bottle that's going to hold your electrolyte, which is distilled water and either sodium hydroxide. The water reservoir is connected to the cell using two three eighth inch tubes, one going into the cell and other coming out . The other component that you're going to need to build this HHO generator is some kind of a power supply that can generate 12V 30amps . This can be a car battery hooked up to a trickle charger, an old computer UPS supply or a 12V battery used for solar panels. The electrode cells are then secured on a wooden frame along with the power supply and the water bottle reservoir for easy portability. Next you need a bubbler .This takes the HHO gas coming into it and diffuses them and gets broken into smaller bubbles. As those bubbles travel up the column of water inside the bubbler, it helps to filter out the sodium hydroxide or potassium hydroxide vapors .If your bubbler is set up correctly, then after being diffused and traveling up that column of water, it tends to get rid of most if not all those vapors. To add a safety feature ,we drill the top of the bottle , remove the lid and cover it up with a plastic foil pressure membrane . If the pressure inside the bubbler increases in case of a flashback ,instead of the jar exploding, the pressure is able to escape through the membrane . https://www.youtube.com/watch?v=ILzMhqEFMeI
- DIY Video:How to build a simple Off Grid Electricity Generation System using Two BatteriesThis project shows you how to generate Off grid AC Power using a simple Solar power station with 2 batteries.This system can provide enough off the grid power to run your appliances around the house.You can easily run light,a laptop computer, small tv and fan for several hours. Most of the item required can be bought from your local store or Amazon.The rough cost of building this system is as follows : $150 for 100W Solar Panel $75 each for 2 batteries. $20 for 400w Inverter $40 for charge controller. The whole system comprises of four things, a couple of batteries, inverter, and a charge controller.The inverter is purchased from Harbor freight ,the charge controller from fry electronics.The deep cycle batteries are from Walmart. So you start by setting up your panels outside. In this case, I have six one amp panel set up, 15 watts a panel, so that's 90 watts coming in. I lead them straight down to the main connection, it's just the six black wires all connected together and twisted tightly to that extension cord wire and the six red ones connected.Feed the line into your house,goes straight to the charge controller. The output wire from the charge controller goes into the battery.So solar panels to charge controller ,charge controller to lead battery in your bank.And as you want to expand this to two,three or more batteries, just use some automotive cables and go from positive terminal of one the positive of the other. And with a black wire, negative terminal to negative terminal, the other one. When you want to run something, just get your inverter that converts the power from DC to AC, take the clamps, clamp them onto that same lead battery in the system. So again, red to the positive side, black to the negative side and flip it on. So remember, when you hook things up like an inverter, or the charge controller or voltmeter, anything you're going to hook up on here, make sure you always pick one of the batteries to be the lead battery and hook everything to that. Whether you parallel one extra battery with it, or five or six or however many you want to put on there. Also added here is a lighted voltmeter which gives you a constant reading on your battery bank so you know exactly what's going on with it at all time. https://www.youtube.com/watch?v=cgEvCLJuBkg https://www.youtube.com/watch?v=8LAjx_XAR90 A simple system that can come really handy during a power outage or in any emergency situation.
- How to Recycle Old Used Laptop Batteries to make a DIY 24V 72AH Emergency Backup Battery SystemThis project goes into the build of a 1.72kwh emergency backup battery system out of old and used laptop batteries and an old military surplus ammo box. The materials you need to build this project are lithium ion 18650 batteries from old laptops, 4X5,3X5 cell holders, ammo can, 40 Amp BMS or Battery management system, spot welder, fused nickel strip, heat shrink, kapton tape. First we determine how many batteries that we can pack inside the ammo box. In our case, we have 2 packs of 91 18650 cells , a total of 182 cells. We take the 4 X5 and 3 X 5 cell holders and connect them to make a couple of 7 x 13 cell holders. To make this 24V lithium ion battery , we need a 7S ( 7 cells in series connection) combination . A single lithium ion cell has a nominal voltage of 3.7V . To make a single long 7S configuration battery , we connect 7 groups of 26 cells in series to get the 25V nominal voltage. The cells used in the build are Samsung ICR18650 - 28A with a capacity of 2800Mah .The cells are rewrapped with heat shrink and added an insulator disk at the positive side of the cell for safety. The cells are installed on the holder in such a way that the first 26 cells are in a same polarity and are connected in parallel. Next 26 cells are installed with opposite polarity and is the connected in series with the first 26 cells . The rest of the cells are connected in the similar way to make a final 7S 2P ( 7 series and 2 Parallel ) configuration with max capacity of 26 X 2.8mah or 72.8 amp hours. A four wide fused nickel strip is used to connect the batteries in series. The nickel strip is placed over the first 4 cells and spot welded in place using the sunkko spot welder. Each cell is individually fused in case there is short circuit or malfunction. The nickel strip connects the first two rows in parallel and then connects the next two rows in series . Similarly, to complete the series connections, the nickel strips are placed and welded on the opposite side of the pack in such a way that it wont short out the connection by coming in contact with the most negative side of the battery. We take 0.15mm standard nickel strips to connect the positive ends of the whole pack together. The last 2 rows of most positive end are connected together using the nickel strip . Small pieces of nickel strips are placed across these two rows to connect them in parallel . The pieces are bent so that it can be connected to a separate copper busbar. The separate 2 battery pack of 7 X 13 cells are connected together by the nickel fuse strip in such a way that one of the pack is flipped on top of the other. The nickel strip that connects the first 3 connection on the 1st pack is bent to connect the 4th connection on the other pack. A 90 degree bent on the last row of the 4p fused nickel strip is welded on to the first battery pack. A piece of kapton tape is placed over the nickel strip to insulate it and hold it together. The bent nickel strip on the first pack is placed on the other pack is such a way that the fuses are perfectly aligned . Then it is welded using a spot welder. A one sixteenth inch ABS plastic is placed in between the two packs. The second pack is now slowly folded over the top of the first pack. The whole pack is then wrapped around with the kapton tape so that it doesn't move around. The last three unconnected terminals on one side of the battery pack is connected to the single row of unconnected terminal on the other side with help of four nickel strips. The 4p fused nickel strip is cut to connect the 3 sides and the other side. To connect the main negative and the positive tabs , we attach a THHN copper wire across the both the terminal ends. The extended nickel connections are folded across the wire to hold it into place and soldered . The terminal wires are then connected together with XT90 connector. Next step is to connect the BMS or Battery management system to the pack . This is a small circuit board which is used to protect each cells of the battery pack from overcharging and becoming unbalanced and getting damaged. It stop the over draining when the cells are fully charged. The BMS used here is a 7S 24V with charge current of 20A and discharge current of 40A. It has two negative leads, one connecting the battery and the other for charging and discharging. The BMS also has 8 sense or balancing wires which are connected to each series connections on the battery. The black wire is connected to the most negative terminal of the battery. The first red wire is connected to the first series connected group of cells, the second red wire is connected to the second series connected cells and so on. The last red wire is connected to the main positive terminal of the battery. A heat shrink is wrapped around the whole battery pack for added safety . Before inserting the battery pack into the ammo box, a hole is drilled on the back side of the ammo can to allow the cables from the battery to pass through. Also a small piece of one sixteenth inch ABS plastic is placed at the bottom of the ammo box as a support and insulation. The battery is slowly dropped into the box . The BMS is placed on the top and is connected to the XT90 connector and the balance wires from the battery. The B- terminal on the BMS is connected to the XT90 connector on the battery. The black wire on the BMS is the charge and discharge lead. To provide extra insulation between the battery pack and the the ammo box ,we attach two pieces of the insulting ABS sheet on either side of the box. The lid is put back on the box and the battery build is complete.