A particular emergency lighting unit (battery pack) is rated for 100 watts. Remote lighting heads will also be fed. The voltage is 6VDC. I'm trying to understand "amp hours" which I see listed on replacement batteries for emerg. lighting units. For this 100 watt unit, how many amp hours should the battery (batteries) be rated for?
One other thought -- I remember reading that the amp-hour relationship is non-linear. A 10 amp hour battery will deliver 1 amp for 10 hours, but will not be capable of delivering 10 amps for a full hour.
Correct. That's why it is important to note that his 75 W load is less than or equal to the 100 W rating of the battery. If he had a 200 W load, it would severely underperform. If he had a 10 W load, it would significantly overperform.
I'd like to give one more example. A 36 watt, 6VDC emergency lighting unit has it's battery missing for one reason or another. I would order a 9 amp hour battery based on the actual wattage (36) fully lit for 90 min. Am I correct?