Showing posts with label capacitors. Show all posts
Showing posts with label capacitors. Show all posts

Tuesday, December 15, 2015

Research is interesting!

It seems that super capacitor technology hasn't been fully embraced yet. Having said that, there are portable car starting units that are built from super capacitors.

Browsing around, it seems several people are claiming to have successfully replaced their car batteries with super capacitors. There are reports that alternators die fairly swiftly yet these reports have a pretty even chance of being true or false.

The actual circuitry for the super capacitor is very simple. The capacitors are wired in parallel. The interesting thing is that the individual capacitors act very differently from the way a battery would, adding to the complexity of the task. Each capacitor holds a charge of around 2.7 volts. As the charge reduces so does the voltage but at a greater extent than a battery.

There have been attempts to blend lithium batteries with super capacitors but the results are as yet unknown. Thus far it looks as though my power solution has to be along the following lines:
1. A lithium battery - if the manufacturers website is right about the high amperage output. The limiting factor is the high cost.
2. A super capacitor solution though this is a bit of a mystery at the moment and looks ominously like it'll be expensive.
3. A standard battery solution using an $80 marine battery. This would not power the microwave or the fridge but cooking could be achieved using gas when mains power is unavailable.
4. A standard battery solution using the same $80 marine battery but backed up by a generator that's run every time more than a couple of amps is needed.
5. A further solution could be a hybrid super capacitor and battery solution though this is an unknown.
6. For a final solution, sufficient batteries to provide sufficient amperage to power a microwave though this could be heavy and expensive.

Whichever way the solution ends up going, its going to be interesting!

posted from Bloggeroid

Saturday, December 12, 2015

Electronics guru needed!

In the quest toward the perfect power system, yesterday I had somewhat of a brainwave. Looking at batteries, I've heard lots of strange tales from those ridiculous forums about it being instant battery death to use one down to zero. Well, I found a table that looks believable about how long a battery will last if it's discharged totally.

It work out that a standard car battery will die within 3 months to a year if it's regularly discharged to zero. A marine battery will die in 12-36 months. Now that sounds very doable. Indeed, if all I have to do is to spend $80 on batteries every six months or so, I'm not unhappy. I calculated my daily power usage should be somewhere around 80ah

The brainwave I had was based around super capacitors. Rather than having a huge bank of 12v batteries providing sufficient amperage to power a microwave, a capacitor bank containing sufficient power to run a microwave for 8 minutes (long enough to cook just about anything). The capacitors could be charged at a rate that wouldn't exceed the capability of the battery. Because capacitors can hold power at 120v, after charging, the output need only be converted to AC. As my microwave uses 1040 watts, I need only to hold about 9000 watt hours. That's 75ah. Like as not, the microwave would be used for only 3 - 4 minutes at a time but extra capacity is always good.

The super capacitors would act as a surge buffer, allowing the use of fewer batteries. Thius could catch on in the RV world. I guess I'll have to find an electronics guru to make it happen.

Today was pretty much a nothing day. I went out to buy more welding rods because I know that what I have is insufficient to complete what I'm doing. Due to the Christmas traffic, it was dusk before I returned. Thus, nothing was achieved. Having said that, it was too hot earlier to wear my heavy jacket in order to weld. Thus, I got an apron and arm protectors. Now I shall be able to weld in a short sleeve shirt and still be protected. Cool and welding!

The plan tomorrow is to get some welding done then having completed that, to put everything under cover as Monday its going to rain and I have yet to paint my welds. Given sufficient free time I might also connect my Peltier gizmo to my solar panel to see what happens.