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= Calculating DC Electrical Capacity =
== Summary ==
Calculating DC (direct current) load for the [[DCPrimarySystem|DC primary system]] is an activity in determining the capacity of the boat's house bank of DC (direct current) batteries. 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:ElectricalPrimarySupply|house bank]] specifications.<ref>http://www.powerstream.com/battery-capacity-calculations.htm</ref> <ref>http://web.mit.edu/evt/summary_battery_specifications.pdf</ref>
A link to a spreadsheet is provided.
== DC Load ==
<div id="spreadsheet"><i>Download spreadsheet:</i> [[Media:CalculatedLoadDC.xlsx|Microsoft Office xlsx]] | [[Media:CalculatedLoadDC.ods|Libre/Open Office ods]]</div>
<table border="1" style="width:90%">
<tr><th>ITEM </th><th> NUMBER </th><th> AMPS </th><th> AMPS <br>TOTAL </th><th> HOURS <br>PER DAY </th><th> DUTY <br>CYCLE </th><th> AMP <br>HOURS </th></tr>
<tr><td colspan="7"> FIXED LOADS </td></tr>
<tr><td colspan="7"><b> Cabins </b></td></tr>
<tr><td colspan="7"> Electronic Equipment </td></tr>
<tr><td style="text-align:right"><i> Radio Transmitter </i></td><td> 1 </td><td> 0.0 </td><td> 0.0 </td><td> 2.0 </td><td> 8% </td><td> 0.0 </td></tr>
<tr><td style="text-align:right"><i> SSB </i></td><td> 1 </td><td> 0.0 </td><td> 0.0 </td><td> 1.0 </td><td> 4% </td><td> 0.0 </td></tr>
<tr><td colspan="7"> Ventilation </td></tr>
<tr><td style="text-align:right"><i> Forward Cabin </i></td><td> 10 </td><td> 0.0 </td><td> 0.0 </td><td> 0.0 </td><td> 0% </td><td> 0.0 </td></tr>
<tr><td style="text-align:right"><i> Aft Cabin </i></td><td> 2 </td><td> 0.0 </td><td> 0.0 </td><td> 0.0 </td><td> 0% </td><td> 0.0 </td></tr>
<tr><td style="text-align:right"><i> Heads </i></td><td> 2 </td><td> 0.0 </td><td> 0.0 </td><td> 0.0 </td><td> 0% </td><td> 0.0 </td></tr>
<tr><td style="text-align:right"><i> Galley </i></td><td> 1 </td><td> 0.0 </td><td> 0.0 </td><td> 0.0 </td><td> 0% </td><td> 0.0 </td></tr>
<tr><td style="text-align:right"><i> Pilot House </i></td><td> 2 </td><td> 0.0 </td><td> 0.0 </td><td> 0.0 </td><td> 0% </td><td> 0.0 </td></tr>
<tr><td style="text-align:right"><i> Salon </i></td><td> 2 </td><td> 0.0 </td><td> 0.0 </td><td> 0.0 </td><td> 0% </td><td> 0.0 </td></tr>
<tr><td bgcolor="#FF0000" colspan="7"> </td></tr>
<tr><td colspan="7"> Instruments </td></tr>
<tr><td style="text-align:right"><i> Alarm System (stnby) </i></td><td> 0 </td><td> 0.0 </td><td> 0.0 </td><td> 0.0 </td><td> 0% </td><td> 0.0 </td></tr>
<tr><td style="text-align:right"><i> Autopilot </i></td><td> 0 </td><td> 0.0 </td><td> 0.0 </td><td> 0.0 </td><td> 0% </td><td> 0.0 </td></tr>
<tr><td style="text-align:right"><i> Depth Sounder </i></td><td> 1 </td><td> 0.0 </td><td> 0.0 </td><td> 24.0 </td><td> 100% </td><td> 0.0 </td></tr>
<tr><td style="text-align:right"><i> Radar </i></td><td> 1 </td><td> 0.0 </td><td> 0.0 </td><td> 24.0 </td><td> 100% </td><td> 0.0 </td></tr>
<tr><td style="text-align:right"><i> GPS </i></td><td> 1 </td><td> 0.0 </td><td> 0.0 </td><td> 24.0 </td><td> 100% </td><td> 0.0 </td></tr>
<tr><td style="text-align:right"><b> SubTotal </b></td><td> </td><td> </td><td> </td><td> </td><td> </td><td> 0.0 </td></tr>
<tr><td bgcolor="#FF0000" colspan="7"> </td></tr>
<tr><td colspan="7"> Machinery </td></tr>
<tr><td> Navigation Lights </td><td> 1 </td><td> 5.0 </td><td> 5.0 </td><td> 24.0 </td><td> 100% </td><td> 5.0 </td></tr>
<tr><td> Bilge Blowers </td><td> 0 </td><td> 0.0 </td><td> 0.0 </td><td> 0.0 </td><td> 0% </td><td> 0.0 </td></tr>
<tr><td> Bilge Pumps </td><td> 0 </td><td> 0.0 </td><td> 0.0 </td><td> 1.0 </td><td> 4% </td><td> 0.0 </td></tr>
<tr><td> Wipers </td><td> 0 </td><td> 0.0 </td><td> 0.0 </td><td> 24.0 </td><td> 100% </td><td> 0.0 </td></tr>
<tr><td> Searchlight </td><td> 0 </td><td> 0.0 </td><td> 0.0 </td><td> 1.0 </td><td> 4% </td><td> 0.0 </td></tr>
<tr><td> Instruments </td><td> 0 </td><td> 0.0 </td><td> 0.0 </td><td> 24.0 </td><td> 100% </td><td> 0.0 </td></tr>
<tr><td> Ventilation - Engine </td><td> 2 </td><td> 0.0 </td><td> 0.0 </td><td> 24.0 </td><td> 100% </td><td> 0.0 </td></tr>
<tr><td style="text-align:right"><b> SubTotal </b></td><td> </td><td> </td><td> </td><td> </td><td> </td><td> 5.0 </td></tr>
<tr><td bgcolor="#FF0000" colspan="7"> </td></tr>
<tr><td> Other </td><td> 0 </td><td> 0.0 </td><td> 0.0 </td><td> 0.0 </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> 0.0 </td></tr>
<tr><td> Total Fixed </td><td></td> <td></td><td></td><td></td><td></td> <td> 5.0 </td></tr>
<tr><td bgcolor="#FF0000" colspan="7"> </td></tr>
<tr><td colspan="7"> INTERMITTENT LOADS </td></tr>
<tr><td colspan="7"> Cabins </td></tr>
<tr><td colspan="7"> Cabin Lighting </td></tr>
<tr><td style="text-align:right"><i> Halogen 10 W </i></td><td> 5 </td><td> 0.8 </td><td> 4.0 </td><td> 6.0 </td><td> 25% </td><td> 1.0 </td></tr>
<tr><td style="text-align:right"><i> Halogen 20 W </i></td><td> 32 </td><td> 1.6 </td><td> 51.2 </td><td> 6.0 </td><td> 25% </td><td> 12.8 </td></tr>
<tr><td style="text-align:right"><i> Halogen 35 W </i></td><td> 0 </td><td> 2.9 </td><td> 0.0 </td><td> 6.0 </td><td> 25% </td><td> 0.0 </td></tr>
<tr><td style="text-align:right"><i> 3 LED Reading Light </i></td><td> 0 </td><td> 0.03 </td><td> 0.0 </td><td> 3.0 </td><td> 13% </td><td> 0.0 </td></tr>
<tr><td style="text-align:right"><i> 6 LED Reading Light </i></td><td> 0 </td><td> 0.06 </td><td> 0.0 </td><td> 3.0 </td><td> 13% </td><td> 0.0 </td></tr>
<tr><td style="text-align:right"><i> 9 LED Reading Light </i></td><td> 10 </td><td> 0.09 </td><td> 0.9 </td><td> 3.0 </td><td> 13% </td><td> 0.1 </td></tr>
<tr><td style="text-align:right"><i> 10 W Fluorescent </i></td><td> 0 </td><td> 0.80 </td><td> 0.0 </td><td> 6.0 </td><td> 25% </td><td> 0.0 </td></tr>
<tr><td style="text-align:right"><i> 13 W Fluorescent </i></td><td> 0 </td><td> 0.80 </td><td> 0.0 </td><td> 6.0 </td><td> 25% </td><td> 0.0 </td></tr>
<tr><td style="text-align:right"><i> 15 W Fluorescent </i></td><td> 0 </td><td> 1.20 </td><td> 0.0 </td><td> 6.0 </td><td> 25% </td><td> 0.0 </td></tr>
<tr><td style="text-align:right"><i> 18 W Fluorescent </i></td><td> 0 </td><td> 1.50 </td><td> 0.0 </td><td> 6.0 </td><td> 25% </td><td> 0.0 </td></tr>
<tr><td style="text-align:right"><i> 20 W Fluorescent </i></td><td> 0 </td><td> 1.60 </td><td> 0.0 </td><td> 6.0 </td><td> 25% </td><td> 0.0 </td></tr>
<tr><td style="text-align:right"><i> 26 W Fluorescent </i></td><td> 0 </td><td> 2.10 </td><td> 0.0 </td><td> 6.0 </td><td> 25% </td><td> 0.0 </td></tr>
<tr><td style="text-align:right"><b> SubTotal Lights </b></td><td> </td><td> </td><td> </td><td> </td><td> </td><td> 13.9 </td></tr>
<tr><td bgcolor="#FF0000" colspan="7"> <tr><td bgcolor="#FF0000" colspan="7"> </td></tr>
<tr><td> Cigarette Lighter </td><td> 0 </td><td> 0.0 </td><td> 0.0 </td><td> 1.0 </td><td> 4% </td><td> 0.0 </td></tr>
<tr><td colspan="7"> Electronic Equipment </td></tr>
<tr><td style="text-align:right"><i> SW Receiver </i></td><td> 1 </td><td> 0.0 </td><td> 0.0 </td><td> 1.0 </td><td> 4% </td><td> 0.0 </td></tr>
<tr><td style="text-align:right"><i> Stereo - Saloon </i></td><td> 1 </td><td> 8.3 </td><td> 8.3 </td><td> 12.0 </td><td> 50% </td><td> 4.2 </td></tr>
<tr><td style="text-align:right"><i> Stereo - Dinette </i></td><td> 1 </td><td> 8.3 </td><td> 8.3 </td><td> 12.0 </td><td> 50% </td><td> 4.2 </td></tr>
<tr><td style="text-align:right"><i> Stereo - Main Cabin </i></td><td> 1 </td><td> 8.3 </td><td> 8.3 </td><td> 4.0 </td><td> 17% </td><td> 1.4 </td></tr>
<tr><td style="text-align:right"><i> Microwave </i></td><td> 0 </td><td> 68.0 </td><td> 0.0 </td><td> 0.0 </td><td> 0% </td><td> 0.0 </td></tr>
<tr><td style="text-align:right"><b> SubTotal Equipment </b></td><td> </td><td> </td><td> </td><td> </td><td> </td><td> 9.7 </td></tr>
<tr><td bgcolor="#FF0000" colspan="7"> <tr><td bgcolor="#FF0000" colspan="7"> </td></tr>
<tr><td colspan="7"> Machinery </td></tr>
<tr><td> Trim Tabs </td><td> 0 </td><td> 0.0 </td><td> 0.0 </td><td> 0.0 </td><td> 0% </td><td> 0.0 </td></tr>
<tr><td> Horn </td><td> 1 </td><td> 0.0 </td><td> 0.0 </td><td> 0.0 </td><td> 0% </td><td> 0.0 </td></tr>
<tr><td> Anchor Windlass </td><td> 0 </td><td> 0.0 </td><td> 0.0 </td><td> 0.0 </td><td> 0% </td><td> 0.0 </td></tr>
<tr><td> Winches </td><td> 0 </td><td> 0.0 </td><td> 0.0 </td><td> 0.0 </td><td> 0% </td><td> 0.0 </td></tr>
<tr><td> Fresh water Pumps </td><td> 1 </td><td> 0.0 </td><td> 0.0 </td><td> 2.0 </td><td> 8% </td><td> 0.0 </td></tr>
<tr><td> Air Conditioner </td><td> 1 </td><td> 0.0 </td><td> 0.0 </td><td> 0.0 </td><td> 0% </td><td> 0.0 </td></tr>
<tr><td> Furnace - Diesel </td><td> 1 </td><td> 7.5 </td><td> 7.5 </td><td> 7.0 </td><td> 29% </td><td> 2.2 </td></tr>
<tr><td colspan="7"> Refrigeration </td></tr>
<tr><td style="text-align:right"><i> Cold Plate </i></td><td> 1 </td><td> 35.0 </td><td> 35.0 </td><td> 2.0 </td><td> 8% </td><td> 2.9 </td></tr>
<tr><td style="text-align:right"><i> Constant Cycling </i></td><td> 0 </td><td> 7.0 </td><td> 0.0 </td><td> 8.0 </td><td> 33% </td><td> 0.0 </td></tr>
<tr><td> Sewage Pump </td><td> 1 </td><td> 0.0 </td><td> 0.0 </td><td> 2.0 </td><td> 8% </td><td> 0.0 </td></tr>
<tr><td style="text-align:right"><b> SubTotal Machinery </b></td><td> </td><td> </td><td> </td><td> </td><td> </td><td> 5.1 </td></tr>
<tr><td bgcolor="#FF0000" colspan="7"> <tr><td bgcolor="#FF0000" colspan="7"> </td></tr>
</table>
See also [[ElectricalCapacityAC]].
== Links == [[Category:ElectricalSystemsElectricalCapacity]]