Quote:
Originally Posted by scrubjaysnest
Tried to answer Chances' question on the high wattage items, keeps timing out on me. For a 1500 watt item for 15 minutes its 375 WH; typical GC-2 battery is 2700 WH. Keeping discharge to 50% is 1350 WH. The drip coffee makers I'm familiar with take about 20 to 30 minutes so figure 750 WH or half your 1350 WH of available battery.
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Thanks for feedback, that is a lot of energy to brew coffee.
I had measured our Keurig single-cup coffee maker before (rated 1450 watts) which takes 90 seconds per cup, but decided to test it again just to make sure.
When first turned on, it pulls 12 Amps for 40 seconds, then drops to 8 Amps for 20 seconds. For the remaining 30 seconds there is essentially no power consumption.
We each drink 2 cups in the morning, so total energy for our 4 cups is 85 watt-hours. Allowing for inverter and wiring inefficiency, I expect 120 watt-hours from batteries, or 10 Amp-hours (based on 12-Volt system) should easily cover our morning coffee. As Bob stated somewhere, being more efficient is often easier than adding more capacity.
What I would really like to have (i.e. -- need) is the ability to run a small air conditioner off batteries at night. Just wish it wasn't so expensive and/or heavy.
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