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[[File:CalculatedLoadAC.xlsx||Download spreadsheet]] <table border="1" style="width:10090%">
[coming soon...]
→Peak Load
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= Calculating AC Electrical Capacity =
== Summary ==
Calculating AC (alternating current) load is an activity in determining the capacity of the boat's house bank of DC (direct current) batteries. Peak load is also necessary in sizing the inverter to convert DC to AC. Over estimating the numbers to provide comfort in the individual calculations is not recommended. It is better to add spare capacity calculations directly to the [[:Category:InverterSystems|inverter ]] and [[:Category:ElectricalPrimarySupply|house bank ]] specifications.
Do the AC load calculation first because it will provide data for the peak load. However, peak load is shown first because it is shorter, and so it won't get lost at the bottom of the page.
A link to a [[#spreadsheet]] is provided.
See also [[ElectricalCapacityDC]].
== Peak Load ==
To determine the peak-load requirement divide the day into [[https://en.wikipedia.org/wiki/Watch_system watches]] that conform to the ebb and flow of your day. Here we are using the merchant-marine watch system. You can use a finer grained system if you know that your lifestyle uses a lot of electricity at a specific time.
The peak load period might be a good time to run the generator to recharge the [[:Category:ElectricalPrimarySupply|house bank]]. List the appliances and enter their power consumption in watts (W) in the period when they are used. Add up each column to determine what the peak load is and when it occurs, then divide by the number of hours in the watch (4 h in the example) for the average. After you've identified the peak period— or, you might want to analyze AC usage per hour for that period to get a better assessment of the actual peak consumption.
<table border="1" style="width:80%">
<tr><thalign="right">WatchPeriod:</th><th>0000 - 0004 (w)</th><th>0004 - 0008 (w)</th><th>0008 - 1200 (w)</th><th>1200 - 1600 (w)</th><th>1600 - 2000 (w)</th><th>2000 - 0000 (w)</th></tr>
<tr><td> </td><td> </td><td> </td><td> </td><td> </td><td> </td><td> </td></tr>
<tr><td>e.g., Toaster</td><td> </td><td>1500</td><td> </td><td> </td><td>1500</td><td> </td></tr>
==AC Load ==
<div id="spreadsheet"><i>Download spreadsheet:</i> [[Media:CalculatedLoadAC.xlsx|Microsoft Office xlsx]] | [[Media:CalculatedLoadAC.ods|Libre/Open Office ods]]</div>
The AC load is based on the duty cycle of an appliance. The duty cycle is the hours it is used in a day (24 hours).
* <watts total> * <duty cycle> = <watts/hour>
The below table identifies many common appliances and suggests some default values. [http://www.oksolar.com/technical/consumption.html OK Solar] also has some typical energy consumption for different devices. <i>Always confirm your actuals</i>.
<tr><th>ITEM</th> <th>NUMBER</th> <th>WATTS</th> <th>WATTS<br />TOTAL</th> <th>HOURS<br />PER DAY</th> <th>DUTY<br />CYCLE</th> <th>WATTS<br />PER HOUR</th></tr>
<tr><td>CoffeeMaker</td> <td>1</td> <td>800</td> <td>800</td> <td>3.0</td> <td>0.13</td> <td>100</td></tr>
<tr><td colspan="7"> Computer </td></tr> <tr><td style="text-align:right"><i>Laptop computer </i></td><td> 0 </td><td> 50 </td><td> 0 </td><td> 6.0 </td><td> 0.25 </td><td> 0 </td></tr> <tr><td style="text-align:right"><i>Desktop computer </i></td><td> 0 </td><td> 250 </td><td> 0 </td><td> 6.0 </td><td> 0.25 </td><td> 0 </td></tr> <tr><td style="text-align:right"><i>Printer </i></td><td> 0 </td><td> 100 </td><td> 0 </td><td> 0.5 </td><td> 0.02 </td><td> 0 </td></tr> <tr><td bgcolor="#FF0000" colspan="7"> </td></tr> <tr><td> Electric frying pan </td><td> 0 </td><td> 1200 </td><td> 0 </td><td> 1.0 </td><td> 0.04 </td><td> 0 </td></tr> <tr><td> Waffle Iron </td><td> 0 </td><td> 1200 </td><td> 0 </td><td> 0.4 </td><td> 0.02 </td><td> 0 </td></tr> <tr><td bgcolor="#FF0000" colspan="7"> </td></tr> <tr><td> Drill 1/2" </td><td> 0 </td><td> 750 </td><td> 0 </td><td> </td><td> 0.00 </td><td> 0 </td></tr> <tr><td> Drill 1" </td><td> 0 </td><td> 1000 </td><td> 0 </td><td> </td><td> 0.00 </td><td> 0 </td></tr> <tr><td> Circular saw 8-1/4" </td><td> 0 </td><td> 1400 </td><td> 0 </td><td> </td><td> 0.00 </td><td> 0 </td></tr> <tr><td> CD Player </td><td> 0 </td><td> 35 </td><td> 0 </td><td> </td><td> 0.00 </td><td> 0 </td></tr> <tr><td bgcolor="#FF0000" colspan="7"> </td></tr> <tr><td> Hot plate </td><td> 0 </td><td> 1200 </td><td> 0 </td><td> </td><td> 0.00 </td><td> 0 </td></tr> <tr><td> Deep fryer </td><td> 0 </td><td> 1500 </td><td> 0 </td><td> </td><td> 0.00 </td><td> 0 </td></tr> <tr><td> Pressure cooker </td><td> 0 </td><td> 1000 </td><td> 0 </td><td> </td><td> 0.00 </td><td> 0 </td></tr> <tr><td> Curling Iron </td><td> 1 </td><td> 50 </td><td> 50 </td><td> 1.0 </td><td> 0.04 </td><td> 2 </td></tr> <tr><td> Hair Dryer </td><td> 1 </td><td> 1250 </td><td> 1250 </td><td> 1.0 </td><td> 0.04 </td><td> 52 </td></tr> <tr><td> Shaver </td><td> 0 </td><td> 15 </td><td> 0 </td><td> 0.3 </td><td> 0.01 </td><td> 0 </td></tr> <tr><td> Kettle </td><td> 1 </td><td> 1500 </td><td> 1500 </td><td> 3.0 </td><td> 0.13 </td><td> 188 </td></tr> <tr><td> Microwave </td><td> 1 </td><td> 1500 </td><td> 1500 </td><td> 5.0 </td><td> 0.21 </td><td> 313 </td></tr> <tr><td> Toaster </td><td> 1 </td><td> 1200 </td><td> 1200 </td><td> 3.0 </td><td> 0.13 </td><td> 150 </td></tr> <tr><td colspan="7"> Outlets </td></tr> <tr><td style="text-align:right"><i>Engine Room </i></td><td> 1 </td><td> 1500 </td><td> 1500 </td><td> 1.0 </td><td> 0.04 </td><td> 63 </td></tr> <tr><td style="text-align:right"><i> Pilot House </i></td><td> 1 </td><td> 1500 </td><td> 1500 </td><td> 1.0 </td><td> 0.04 </td><td> 63 </td></tr> <tr><td style="text-align:right"><i> Heads - GFC </i></td><td> 2 </td><td> 1500 </td><td> 3000 </td><td> 2.0 </td><td> 0.08 </td><td> 250 </td></tr> <tr><td style="text-align:right"><i> Port Berth </i></td><td> 1 </td><td> 1500 </td><td> 1500 </td><td> 1.0 </td><td> 0.04 </td><td> 63 </td></tr> <tr><td style="text-align:right"><i> Starboard Berth </i></td><td> 1 </td><td> 1500 </td><td> 1500 </td><td> 1.0 </td><td> 0.04 </td><td> 63 </td></tr> <tr><td style="text-align:right"><i> Galley </i></td><td> 4 </td><td> 1500 </td><td> 6000 </td><td> 1.0 </td><td> 0.04 </td><td> 250 </td></tr> <tr><td style="text-align:right"><i>Dinette </i></td><td> 1 </td><td> 1500 </td><td> 1500 </td><td> 1.0 </td><td> 0.04 </td><td> 63 </td></tr> <tr><td style="text-align:right"><i>Salon </i></td><td> 4 </td><td> 1500 </td><td> 6000 </td><td> 1.0 </td><td> 0.04 </td><td> 250 </td></tr> <tr><td style="text-align:right"><i>Aft Cabin </i></td><td> 3 </td><td> 1500 </td><td> 4500 </td><td> 1.0 </td><td> 0.04 </td><td> 188 </td></tr> <tr><td style="text-align:right"><b>SubTotal </b></td><td> </td><td> </td><td> </td><td> </td><td> </td><td> 1954 </td></tr> <tr><td bgcolor="#FF0000" colspan="7"> </td></tr> <tr><td colspan="7"> MOTORS & HEATERS </td></tr> <tr><td> Air Compressor </td><td> 0 </td><td> 0 </td><td> 0 </td><td> 0.0 </td><td> 0.00 </td><td> 0 </td></tr> <tr><td> Battery Charger </td><td> 0 </td><td> 0 </td><td> 0 </td><td> 0.0 </td><td> 0.00 </td><td> 0 </td></tr> <tr><td> Exhaust & Supply Fans </td><td> 0 </td><td> 0 </td><td> 0 </td><td> 0.0 </td><td> 0.00 </td><td> 0 </td></tr> <tr><td> Air Conditioners </td><td> 0 </td><td> 0 </td><td> 0 </td><td> 0.0 </td><td> 0.00 </td><td> 0 </td></tr> <tr><td> Water Heater </td><td> 1 </td><td> 4000 </td><td> 4000 </td><td> 4.0 </td><td> 0.17 </td><td> 667 </td></tr> <tr><td> Electric, gas or oil Heaters </td><td> 0 </td><td> 0 </td><td> 0 </td><td> 0.0 </td><td> 0.00 </td><td> 0 </td></tr> <tr><td> 25% of Largest Motor </td><td> 1 </td><td> 0 </td><td> 0 </td><td> 0.0 </td><td> 0.00 </td><td> 0 </td></tr> <tr><td style="text-align:right"><b>SubTotal </b></td><td> </td><td> </td><td> </td><td> </td><td> </td><td> 667 </td></tr> <tr><td bgcolor="#FF0000" colspan="7"> </td></tr> <tr><td colspan='7"> BUILT-IN APPLIANCES </td></tr> <tr><td> Clothes </td><td> </td><td> </td><td> </td><td> </td><td> </td><td> </td></tr> <tr><td> Clothes Dryer </td><td> 0 </td><td> 1300 </td><td> 0 </td><td> 3.0 </td><td> 0.13 </td><td> 0 </td></tr> <tr><td> Clothes Washer </td><td> 0 </td><td> 500 </td><td> 0 </td><td> 3.0 </td><td> 0.13 </td><td> 0 </td></tr> <tr><td> Clothes Dryer/Washer Combo </td><td> 1 </td><td> 1300 </td><td> 1300 </td><td> 3.0 </td><td> 0.13 </td><td> 163 </td></tr> <tr><td> Dishwasher </td><td> 1 </td><td> 1500 </td><td> 1500 </td><td> 3.0 </td><td> 0.13 </td><td> 188 </td></tr> <tr><td> Disposal </td><td> 0 </td><td> 450 </td><td> 0 </td><td> </td><td> 0.00 </td><td> 0 </td></tr> <tr><td> Freezer </td><td> 0 </td><td> 0 </td><td> 0 </td><td> </td><td> 0.00 </td><td> 0 </td></tr> <tr><td> Vacuum cleaner </td><td> 0 </td><td> 700 </td><td> 0 </td><td> </td><td> 0.00 </td><td> 0 </td></tr> <tr><td> Ice Maker </td><td> 0 </td><td> 200 </td><td> 0 </td><td> </td><td> 0.00 </td><td> 0 </td></tr> <tr><td> Oven </td><td> 0 </td><td> 0 </td><td> 0 </td><td> </td><td> 0.00 </td><td> 0 </td></tr> <tr><td> Refrigerator </td><td> 0 </td><td> 750 </td><td> 0 </td><td> 8.0 </td><td> 0.33 </td><td> 0 </td></tr> <tr><td colspan="7"> Stove Top </td></tr> <tr><td style="text-align:right"><i> Induction </i></td><td> 1 </td><td> 2600 </td><td> 2600 </td><td> 4.0 </td><td> 0.17 </td><td> 433 </td></tr> <tr><td style="text-align:right"><i> Halogen </i></td><td> 0 </td><td> </td><td> 0 </td><td> </td><td> 0.00 </td><td> 0 </td></tr> <tr><td style="text-align:right"><i> Coils </i></td><td> 0 </td><td> </td><td> 0 </td><td> </td><td> 0.00 </td><td> 0 </td></tr> <tr><td style="text-align:right"><i> Solid Disc </i></td><td> 0 </td><td> </td><td> 0 </td><td> </td><td> 0.00 </td><td> 0 </td></tr> <tr><td> Towel Rail </td><td> 5 </td><td> 100 </td><td> 500 </td><td> </td><td> 0.50 </td><td> 250 </td></tr> <tr><td> Trash Compactor </td><td> 0 </td><td> 0 </td><td> 0 </td><td> </td><td> 0.00 </td><td> 0 </td></tr> <tr><td> TV </td><td> 1 </td><td> 1500 </td><td> 1500 </td><td> </td><td> 0.25 </td><td> 375 </td></tr> <tr><td> Vacuum System </td><td> 0 </td><td> 0 </td><td> 0 </td><td> </td><td> 0.00 </td><td> 0 </td></tr> <tr><td> Other </td><td> 0 </td><td> 0 </td><td> 0 </td><td> </td><td> 0.00 </td><td> 0 </td></tr> <tr><td style="text-align:right"><b>SubTotal </b></td><td> </td><td> </td><td> </td><td> </td><td> </td><td> 875 </td></tr> <tr><td bgcolor="#FF0000" colspan="7"> </td></tr> <tr><td colspan="7"> FREESTANDING RANGE </td></tr> <tr><td> Load Watts </td><td> 0 </td><td> 0 </td><td> 0 </td><td> </td><td> 0.00 </td><td> 0 </td></tr> <tr><td style="text-align:right"><b> SubTotal </b></td><td> </td><td> </td><td> </td><td> </td><td> </td><td> 0 </td></tr><tr><td bgcolor="#FF0000" colspan="7"> </td></tr> <tr><td style="text-align:right"><b>TOTAL </b></td><td> </td><td> </td><td> </td><td> </td><td> </td><td> 3496 </td></tr>
</table>
[[Category:ElectricalCapacity]]
[[Category:Appliances]]
