Power From USB Charger

[bartw_99]

Hello,

I want to make my PI portable, but now I'm running into a problem. Is it possible to use this USB charger (http://dx.com/p/universal-usb-5v-18650- ... wDPYPl5NUN) to run my PI on? I saw several posts on this forum, but I can't get wiser. If I can't use this one, which one should I use?

Thanks in advance,
Bart Wesselink

[wirelessmonk]

You are rarely going to get more than an hour of power with that unit. The linked website reports its specs at 1000mAh (1Ah). RPis are also infamously finicky about power and I would have some misgivings about a generic USB battery. (If you the RPi is a model A or is under very light load, you might get more mileage.) YMMV

I've used this one for up to 6 hours. I only stopped because it was time to pack up. I've never actually drained the battery using the RPi.

I get about 4 hours with a similar mode to this one I received as a gift.

Cheers

[bartw_99]

Thanks for your response! And what if I use a car battery or something?

[bartw_99]

Sorry for bumping this topic, but what about this one?
http://dx.com/p/cager-b12-2500mah-mobil ... wmyZdO0vFo

[FLYFISH TECHNOLOGIES]

Hi,

Sorry for bumping this topic, but what about this one?

According to the specification, you could use it (if you don't have many peripherals).

The authonomy calculation is simple: divide capacity [Ah] with current consumption [A].
For example, this pack is 2.5Ah, if you attach RasPi model B without demanding add-ons (let's assume the current is 700mA), then the authonomy is 2.5/0.7 = 3.5 hours.


Best wishes, Ivan Zilic.

[bartw_99]

Hi,

Sorry for bumping this topic, but what about this one?

According to the specification, you could use it (if you don't have many peripherals).

The authonomy calculation is simple: divide capacity [Ah] with current consumption [A].
For example, this pack is 2.5Ah, if you attach RasPi model B without demanding add-ons (let's assume the current is 700mA), then the authonomy is 2.5/0.7 = 3.5 hours.


Best wishes, Ivan Zilic.

Thanks. It is not necessary that I run it for many hours. On my pi I have attached 2 stepper motors, a distance sensor and wifi. Can it still run for at least 1 hour?

[FLYFISH TECHNOLOGIES]

Hi,

(let's assume the current is 700mA)

On my pi I have attached 2 stepper motors, a distance sensor and wifi. Can it still run for at least 1 hour?

Summarize the current and put the value into the formula.

There is another specification item to pay attention to - the mentioned power pack provides up to 1A. You should not suck more current from it.


Best wishes, Ivan Zilic.

[bartw_99]

Hi,

(let's assume the current is 700mA)

On my pi I have attached 2 stepper motors, a distance sensor and wifi. Can it still run for at least 1 hour?

Summarize the current and put the value into the formula.

There is another specification item to pay attention to - the mentioned power pack provides up to 1A. You should not suck more current from it.


Best wishes, Ivan Zilic.

Ok, thanks.