Can you reverse a inverter to a converter like 12v to 110 into a 110 to 12v with a cord with 2 male ends?
Do not make or use a cord with two 120volt male ends. Its not safe and you could electrocute yourself or a loved one. It sounds like you want to use an inverter as a battery charger. They were not design to go reverse. Don't try it. Just buy a battery charger that fit your needs. If it is indeed for Solar panel system, then you need to find a controller unit for the battery bank then buy the charger that is design to plug into that controller unit. The controller unit help monitor the battery bank so it will not over charge, and stay charged up. Now since I am a Circuit Technician and have built my own PSU for a computer. I am more willing to alter the circuit design of an inverter to be an converter. But then again that is me. You might get lucky and not kill anyone, or yourself for a short period if you choose to ignore the bright minds that tell you NO!. Until you can fix at component level, TV, microwaves ovens, fridges, dvd players, VCR's, portable electronics and such. Do not try to modify an inverter to a converter. Now if you are willing to learn, please do. Look up how capacitors, resistors, diodes, relays, fly back transformers, electron gun, magnetron, yolk. Also look into Arduino, Raspberry PI and other PIC controllers. You might enjoy it. And as well, AC and DC power conversion circuit designs. callipyg... - Give me a break, everyone makes grammar mistakes in their life. You still got the hint since you also gave me the correction to it. Which tells me your bright. Besides I actually understood the question and this question also could be in the wrong category.
How do I use a 110v appliance in a 220v outlet? I bought a cheap step down converter online. I already have an adapter. What do I need to use to make sure this appliance doesn't fry? Can I leave it be since it's 110v in 220v?
First check the Full load requirements of you load (blender) in WATTS. You then purchase an auto transformer, (step down transformer- 220 to 110 VAC) with around 25% more capacity (watts) than your full load requirements and connect in between your load and the power socket. Being a blender, remember to accurately ascertain the maximum load it will require to perform its normal operation. This is usually seen on the bottom of device, on the label. As a safety feature, you could install a suitably rated fuse in between the step down transformer and the load, so that if the load tries to exceed the capacity of the transformer, for any reason, the transformer will be protected.