next342
Posts: 23
Joined: Thu Feb 07, 2013 7:13 am

power consumption?

Sun Mar 10, 2013 5:12 am

im thinking of getting a moniter for my raspi
this one : http://www.amazon.com/gp/product/B007SL ... HMWMCZ9EID

with this power pack : http://www.ebay.com/itm/Portable-6800mA ... 20c5cc7535

so pretty much i would like to know how long 6800mah will last powering a 8watt monitor,and to save time and so i dont have to post 2 more questions on the forum how long will the same 6800mah power pack last powering a 3 watt moniter and also how long will the same 6800mah power pack last powering a 2 watt moniter cause i have a few moniters in mind but i would like to know how long they will last

thank you for your help

User avatar
rpdom
Posts: 14683
Joined: Sun May 06, 2012 5:17 am
Location: Chelmsford, Essex, UK

Re: power consumption?

Sun Mar 10, 2013 6:21 am

8 Watt:
8W / 12V = 0.667A = 667mA. 6800mA / 667mA = 10.19. So it should last just over 10 hours when fully charged under perfect conditions.

3W / 12V = 0.25A = 250mA. 6800mA / 250mA = 27.2 : just over 27 hours.

2W / 12V = 0.167A = 167mA. 6800mA / 167mA = 40.7 : over 40 hours.

This assumes the battery capacity will always be the same. In practice it will fade over time. It also assumes it is capable of supply the required current, but I suspect it will handle 667mA continuously.

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