# Battery to support Polymer Dispersed Liquid Crystal (PDLC) Film

## Summary:

What type/ chemical make-up of battery would be able to support an 8in x 36in piece of PDLC drawing 0.557 Watts per hour at 60VAC for ~45,000 hours

## Main Question or Discussion Point

We are incorporating a PDLC layer into a product being developed by us and it requires almost constant activation to remain transparent. The PDLC draws 0.557 Watts of power per hour at 60VAC. The goal is to get a battery/power source (of any type even proprietary) to last the upwards of 26,000 hours or 3 years. Does anyone have suggestions to look into or ideas?

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What design parameters (size,noise, cost, reliability,radiation, etc are most important? There is no magic here

For instance this is probably ~state of the art:

https://en.wikipedia.org/wiki/Tesla_Powerwall#Powerwall_specifications

At $500/kWh it will not be cheap. Don't know the storage lifetime and probably that will cost more We are looking to keep the cost of the battery itself below$50 if possible and have a size of less than 6x6x2in. radiation isn't much of a concern but it will be in a commercial setting where people will often be near so it can't be abnormally loud.

Thank you!

I suggest a wall plug!! This requirement exceeds any technology known to me by many orders of magnitude.

berkeman
Mentor
We are incorporating a PDLC layer into a product being developed by us and it requires almost constant activation to remain transparent. The PDLC draws 0.557 Watts of power per hour at 60VAC. The goal is to get a battery/power source (of any type even proprietary) to last the upwards of 26,000 hours or 3 years. Does anyone have suggestions to look into or ideas?
We are looking to keep the cost of the battery itself below $50 if possible and have a size of less than 6x6x2in. Rough numbers: 0.557W x 26,000 hours = 14.5kWhr From a 12V battery, you would need about 1,200 A*hr capacity. (not adding in any efficiency losses yet for converting 12Vdc to 60Vac) A typical car battery has a capacity around 100 A*hr, with truck batteries up around 200 A*hr. So far the 6x6x2in. volume numbers aren't working out for you... You could look at how much chemical energy is available in that volume of gasoline, to see if some other energy storage means might work. But with gasoline, you would have a noisy generator. Maybe look at Hydrogen fuel cells? anorlunda Mentor It might be a candidate for a solar panel. Even if used indoors, you can use a solar panel if the lights are kept on 24x7. But you might need a lot more area than 6x6, if used indoors. By the way, say .557 watts. Not .557 watts per hour. You might make the 6x6x2 form factor with a fuel cell, but you would need thousands of dollars for that, not$50.

By the way, when @hutchphd said radiation, I think he was thinking of the Snap nuclear reactor such as used on the Voyager spacecraft. So I don't think you can say radiation is not a concern.