John Doe 2004-06-04T21:32:35Z 2005-03-25T05:35:43Z Fubars R US 10.6626 8955 14235 360 105 False False Peukert-based battery calculations 1. Compute Peukert exponent from battery amp-hour and reserve minutes specs. 3. Compute Peukert exponent using two discharge rates and times. Instructions: Instructions: To compute the Peukert Exponent for a battery where the amp-hours and reserve minutes are known, Simply fill in the form below. The example numbers are for a Trojan T-105 Record the time required to discharge the target battery at two widely different load points to the same Depth of Discharge. Fill in the times and discharge rates below. Reserve Minutes 447 minutes Discharge rate #1 11.25 amps Reserve minute amps 25 amps Discharge time for #1 20 hours Amp-Hour Rating 225 amp-hours Discharge Rate #2 100 amps Amp-hour Rating Time 20 hours Discharge time for #2 1.3414850481902154 hours Peukert Exponent 1.2367047253771279 Peukert Exponent 1.2367047253771279 Note: values < 1 are invalid and indicate an experimental or data error. 2. Peukert compensated Battery capacity Note: The example values are the values computed to the left for the Trojan T-105 Instructions: Fill in the discharge current and peukert exponent (default is to use the above calculated exponent). Battery life and amp-hours available at the discharge rate are computed. Rev 060404 Battery capacity 225 amp-hours © 2004 John De Armond All Rights reserved. Time for specified capacity (20 or 10 typ) 20 Hours May be used freely by anyone. Discharge rate 100 amps Commercial distribution prohibited except by written permission Peukert exponent 1.2367047253771279 Comments, corrections to jgd (at) johngsbbq.com Acceptable depth of discharge 100 percent Peukert amp-hours 399.02057237914175 amp-hours Amp-hours available at discharge rate 134.14850481902155 amp-hours Life at discharge rate to specified DOD 1.3414850481902154 hours Note: Enter values in the shaded areas. Unshaded values are computed. Note: Computations #2 and 3 default to the values computed in #1. Default values may be changed by typing over the values in the shaded boxes. Note: Suggested reference reading includes: Xantrex Link-10 manual - http://www.xantrex.com/support/docserve.asp?id=72 Ample Power's Beer page - http://www.amplepower.com/pwrnews/beer/ Battery Glossary - http://www.misterfixit.com/battery_terms.htm NREL's battery testing - http://www.ctts.nrel.gov/analysis/documents/hawker_validation.html Note: Calculations roughly based on information contained in the Link-10 manual Model validated with Link-10 examples and the author's collected data. -2 0 8 3 22 4 False False Wet Cell batteries Model Volts weight length width height 20 hour cap reserve Computed Peukert exponent cost cycles to 80% dod S225 12 66 135 225 1.2784952525247211 85 T-105 6 61 10.38 7.13 11.19 225 447 1.2367047253771279 55 733 T-125 6 66 10.38 7.13 11.19 235 488 1.1917013459714103 80 650 T-145 6 71 10.38 7.13 11.5 244 530 1.1390499187978613 95 625 T-875 8 63 10.38 7.13 11.19 150 295 1.1653930009007316 102 T-890 8 69 10.38 7.13 11.19 165 340 1.1375247891215452 122 US 8VGC 8 64.5 10.38 7.13 11.9 165 318 1.1978625630759032 50 5SHP 12 86 13.56 6.75 11.5 165 272 1.3387975175230249 220 Everready DC27-850 12 55 12.5 6.75 9.5 120 180 1.3293379880261489 55 Douglas 31EV 12 66 13 6.81 10.17 135 200 1.3684517470694746 Stowaway ST24DC140 12 10.1875 6.8125 9.4375 80 140 1.1723541112177576 Stowaway ST27DC180 12 12 6.8125 9.5 105 180 1.2155978099448428 Stowaway ST31DC205 12 13 6.75 9.875 115 205 1.20235132957016 Stowaway ST4DDC250 12 20.75 8.75 10.875 160 250 1.3766620340091436 Stowaway STDDC400 12 20.75 11 10.88 200 400 1.1989778467157899 Sealed/AGM/gell batteries Model Volts Weight Length Width Height 20 ah cap reserve cost cycles Optima D750S 12 44.9 10 6.8 7.8 65 125 1.1085873974275779 130 220 Optima D750U 12 46.1 10 6.8 7.8 65 125 1.1085873974275779 119 220 Optima Group 31 12 72 13 6.8 9.5 100 190 1.145153068271014 140 Concorde GPC-1234 12 23 7.68 5.15 7.22 33 50 1.1692186463078309 58 Concorde GPC-1248 12 32 9.41 5.45 9.35 48 84 1.1347836451896667 85 Concorde GPC-1260 12 43 10.2 6.6 9.35 60 106 1.1444981721531717 102 Concorde GPC-1272 12 50 11.82 6.6 9.35 72 114 1.2146278951565515 114 Concorde GPC-1280 12 53 10.2 6.6 9.35 80 149 1.1383562319591076 118 Concorde GPC-1285 12 61 85 159 1.1406443914019244 138 Concorde GPC-1295 12 63 11.82 6.6 9.35 95 176 1.1558720838465515 152 Concorde GPC-12105 12 68 12.95 6.75 9.25 105 190 1.1809537198031725 166 Concorde GPC-4D 12 130 20.73 8.66 10.27 210 380 1.325538709557434 301 Concorde GPC-8D 12 158 20.62 10.95 10.17 255 561 1.1292226640400924 376 Concorde GPC-6180 6 55 10.4 7.11 10.91 180 317 1.3029642601764067 145 Exide Orbital 34XCD 12 38 10.175000000000001 7 7.44 50 95 1.1014576407587771 98 Hawker Genesis G12V38Ah10VP 12 32.9 7.75 6.5 6.69 46 66 1.2156171716058568 500 Hawker Genesis G12V70Ah10EP 12 58 13.02 6.62 7.68 72 180 1 200 500 Hawker Odyssey PC1200 12 38.2 7.87 6.66 6.8 40 78 1.0822096883789005 Hawker Odyssey PC1700 12 60.9 13.02 6.62 6.93 65 142 1.0460876334235758 Hawker Odyssey PC2150 12 75 13 6.8 9.4 88 200 1.0313642352738195 Most of the above data taken from Uve's battery page, http://www.geocities.com/CapeCanaveral/Lab/8679/battery.html Hawker, Stowaway and a few other specs obtained from mfrs' web sites 3 15 8 False False foo_1 Text 437 . , AutoFormat AutoFormat AutoFormat AutoFormat AutoFormat AutoFormat AutoFormat AutoFormat AutoFormat AutoFormat AutoFormat 1 1 foo_2 Text 437 . , AutoFormat AutoFormat AutoFormat AutoFormat AutoFormat AutoFormat AutoFormat AutoFormat AutoFormat AutoFormat AutoFormat 1 1