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Item:AmplifierLanternCell Phone5V dc tabletSmall Laptoptotal
do not edit the bold
NOTES on Assumptions:
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NOTES:on daylight hrs only usuallycharge ~2 per day, rotateday hrs usuallynone yet
usually 1 per school
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Qty12601editable field
phones assume 2800 mAmp hr battery which is high average
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Watt Hours/day each 1 item120201432.490
tablet assumes 4000 mAmp hr battery for charge time from low, high average
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Voltage (V)555519.5
amplifier can be ran 24/7 but turned off and not ran always if desire
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Current (A)20.80.524.7
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Power (W)1042.51091.6526.5
total charge hrs phone 2.4 hrs at 500mAmps/hr would be to fully charge a half charged cell phone
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Total Power QtyxPwr (Whrs 1 hr)10815091.6533
total charge hrs phone 5.6 hrs for fully charge at .5 amps
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Total usage/charge hours1255.63.242
total charge hrs for tablet at 2000mAmp rate*2 hrs is 4000 mAmp hr battery charged...
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Total Whrs/day12040840183.3427.3
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PANEL USED (watts)150
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avg hrs sun/day (worse case summer rainy season)
3.22
* worse case is 3.22, average > 11 hrs!
Average hrs sun/day is really closer to 5, but Nov-March rainy season summer 3.22 hrs sometimes
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Panel Whrs/day483
If panel Whrs/day > total watt hrs we are ok for average, then battery is used for bad no sun day
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Battery Selecting (Amp Hrs)150
If Amp hrs for battery will allow system run x days with no sun given total amp hrs battery/amphrs per day
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Deapth of Discharge (DoD) allowed
0.5
* % allowing battery discharge, ideally > 50% ensures > 2+ year life
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Battery descharge % 1 day no solar
23.74%
less % discharge, depth of discharge the longer the battery lasts
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Total Days run load no solar (days)
2.106248537
* ideally users would stop using laptop, last longer, etc
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Whamp hrs
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Total Power used [Wh | Ah=Wh/12V]427.335.60833333
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Solar Power [Wh | Ah=Wh/12V]48340.25
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the following is from a matlab script taking into account a cap on battery storage
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Depth of Discharge (Ah)
24-hours without Solar Panels (Ah)
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150W, Full Night9.705537.7
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180W, Full Night9.739437.7
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320W, Full Night9.631737.7
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120W, Day Hours2.209928.5333
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180W, Day Hours0.506128.5333
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320W, Day Hours0.290128.5333
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powerbudget original based on 5V USB charging
laptops charging
lantern comparison
byu field power tests
solar angle
 
 
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