bulkbatterycalcs

8/4/2019 BulkBatteryCalcs

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StandbyCurrent(Amps)

StandbyTime

(Hours)

HighCurrent(Amps)

HCTime

(Hours) Ah/Day

Nav Instruments 0.5 10.0 5.0GPS 0.5 10.0 5.0

DGPS 0.5 10.0 5.0

Autopilot 0.1 8.0 5.0 1.5 8.3Radar 2.3 4.0 3.9 2.0 16.8

VHF 0.8 8.0 5.0 0.2 7.20.00.0

Lights Cabin 5.0 3.0 15.0

Navigation 1.0 3.0 3.0

Anchor 1.0 8.0 8.0

0.00.0

Amenities Refrigerator 0.0Stereo 0.0

Inverter 0.0Air Conditioning 0.0

0.00.0

Misc. Battery Monitoring 0.1 24.0 2.4

Bilge Pumps 0.0

Waste System 0.0

Windlass 70.0 0.1 5.8Heater System 1.0 2.0 4.0 4.0 18.0LP System 0.5 2.0 1.0Washdown Pump 12.0 0.0 0.4

Freshwater Pump 12.0 0.1 1.0

0.00.0Total 102.0

Loads that turn on and off

regardless of the engine. Estimatetime on a per day basis.



Loads that turn on with the engineCurrent Draw

(Amperes)

Paralell Solenoid 0.9Isolator/EliminatorWater maker

RefrigeratorFreezerBlowers 8.8

Avg. Runtime Load 13.7

Estimated House Load during recharge (amp 4

Copyright by Constantin von Wentzel

Use at your own Risk

Enter Data to the left to determine the required battery capacity.Also fill in the chart above to determine how much current is

drawn from the alternator while it is running. For greater

accuracy, add a house load during recharge (however, it is

[email protected]

Be conservative. Make your estimates for average days. The

required battery capacity is set by default at 4x of daily needscalculated here.

The data I have entered is representative of the equipment wehave on board. Your equipment may be different. Consult

manuals for ampere draws and estimate daily hours based onexperience.

mailto:[email protected]

mailto:[email protected]



Charge System:Daily Charge Needs 102 AhSystem Voltage 12 VoltsBattery Capacity Multiplier 4Desired Battery Bank Capacity (Ah) 408 AhNon-battery load on alternator (see Household pag 13.7 Amperes

Charge Capacity available to recharge battery 92.3 AmperesDays Boat is used per Year 365 days/year

Electrolyte & Sulphation MaintenanceCost of Electrolyte Water 1 USD/qtQuarts of water per cell/maintenance 0.25 qt/cellDays between electrolyte maintenance 31 DaysDays between equalization charges 40 DaysLabor Cost $15 USD/hr

Labor hrs to service a 12V Battery set for electrolyt 0.25 hrsLabor hrs to equalize a bank of batteries 1 hrs

Solar CellCombined Wattage of panels WAvg Hrs. of sunshine/day hrs/DayAvg. Amp-Hours produced per Day Ah/DayCost to Buy and install panels and charger USDExpected Life Years

Wind/Water based electrical generatorAvg. Amp-hours produced per day Ah/day

Cost to Buy and install USDMaintenance Costs USD per Year USD/YearExpected Life Years

Gen-SetMax Amps ACost w/Installation USDGen-Set Life hrsFuel Consumption US Gal/hrFuel Cost USD/US Gal

Maintenance $/1000 hrs runtime (incl labor) USD

Main Engine costsAlternator output (hot) during charge 106 AmperesEngine Cost (w/Installation) 10,000 USDEngine Life 6,000 hrs

Fuel Consumption 0.5 US Gal/hrFuel Cost 1.5 USD/US GalMaintenance $/1000 hrs engine runtime (incl labor) $947 USD

Charge EfficiencyFlooded Cells 83% PercentAbsorbed Glass Mat (AGM) 95% PercentGel Cell 87% Percent



Battery # 1 2 3 4 5 6Battery Used for Comparison Lifeline 8Drr 12CS11 urr HT8D rojan T10 M SV155 WM 8DBattery Type AGM Flooded Flooded Flooded Flooded AGM# of batteries to achieve 12V @ ~408Ah 2 2 2 4 2 2Actual Amp-hours per set (20 hr rate @ 12V) 510 684 442 450 446 490Capacity Fit (the closer to zero the better) 25% 68% 8% 10% 9% 20%

Battery Cost (USD) 774 1366 493 304 418 938Expected Cycle Life @ 50% DOD 1000 3200 1250 500 200 300Maximum Battery Life (est) 8 20 10 6 6 8Individual Battery Length 20.62 22 20.75 10.38 20.62 20.62Individual Battery Width 10.95 11.25 11 7.13 10.95 10.95Individual Battery Height 10.17 18.25 10 11.2 10.17 10.17Battery Bank Weight (lb) 316 544 328 248 262 322Bank Initial Purchase Cost (USD/Ah) 1.52 2.00 1.11 0.68 0.94 1.91Volumetric Amp-hour Capacity 0.111 0.076 0.097 0.136 0.097 0.107

Weight Factor 1.614 1.257 1.348 1.815 1.702 1.522Purchase Cost by cycles 0.77400 0.42688 0.39401 0.60800 2.09000 3.12667

Electrolyte & Equalization Lifeline 8Drr 12CS11 urr HT8D rojan T10 M SV155 WM 8DElectrolyte Water 0 0.04167 0.041667 0.16667 0.041667 0Electrolyte Labor 0 0.625 0.625 2.5 0.625 0Equalization Labor 0 15 15 15 15 0E&E Maintenance Cost 0.00000 0.43246 0.43246 0.49698 0.43246 0.00000

Lifeline 8Drr 12CS11 urr HT8D rojan T10 M SV155 WM 8DMax Charge Acceptance 92.30 92.30 92.30 92.30 92.30 92.30Charge Efficiency (percent converted) 95% 83% 83% 83% 83% 95%

Bulk Charge Rate 87.685 76.609 76.609 76.609 76.609 87.685Daily charge time to Bulk Charge 1.113 1.265 1.265 1.265 1.265 1.113Battery Purchase Costs 0.774 0.427 0.394 0.608 2.090 3.127E&E Maintenance 0.000 0.432 0.432 0.497 0.432 0.000

Solar Cell Depreciation none none none none none noneWind/Water Gen Depreciation none none none none none noneWind/Water Gen Maintenance none none none none none noneGenerator Depreciation none none none none none noneGenerator Fuel Costs none none none none none noneGenerator Maintenance none none none none none none

Engine Depreciation 1.854 2.109 2.109 2.109 2.109 1.854Engine Fuel Costs 0.834 0.949 0.949 0.949 0.949 0.834Engine Maintenance 1.053 1.198 1.198 1.198 1.198 1.053Totals 4.516 5.115 5.082 5.361 6.778 6.868

0.044 0.050 0.050 0.053 0.066 0.067Cost Premium relative to Lifeline 8D 13% 13% 19% 50% 52%

Copyright by Constantin von Wentzel - Use at your own RiskI assume you bulk charge and cycle your batteries from 80% full to 55% full. Max AGM charge a

You want to fully charge your batteries at least once a month in order to prevent



7WM 8D Make/Model Charge Surr 12 Surr HT Trojan TWM SV WM 8D

Gel Available 13% 13% 19% 50% 52%2 46 13% 12% 16% 34% 30%

450 Ah 50 12% 12% 14% 25% 18%10% Over/Under desired Ah 53 11% 11% 12% 19% 12%

898 USD/set 57 9% 9% 10% 15% 8%500 cycles 60 8% 8% 9% 13% 7%5 Years 64 8% 8% 9% 12% 6%

20.62 in 67 8% 8% 9% 13% 7%10.95 in 71 9% 8% 9% 13% 7%10.17 in 75 9% 9% 10% 14% 7%316 lb total 78 9% 9% 10% 15% 8%2.00 USD per amp-hour 82 9% 9% 10% 15% 8%

0.098 Ah/in^3 at 12V 85 10% 9% 10% 15% 8%

1.424 Ah/lb at 12V 89 10% 10% 11% 16% 9%1.79600 USD/cycle 92 10% 10% 11% 16% 9%

98 10% 10% 11% 17% 9%

WM 8D 103 10% 10% 11% 17% 10%0 $/maintenance 109 11% 11% 12% 19% 11%0 $/maintenance 114 11% 11% 13% 21% 13%0 $/maintenance 119 12% 12% 14% 23% 16%

0.00000 USD/Day 125 12% 12% 15% 27% 21%130 13% 12% 16% 32% 28%

WM 8D 136 13% 13% 17% 40% 38%92.30 Amperes 141 13% 13% 19% 51% 54%87% Percent 147 13% 43% 50% 97% 76%

80.301 Amperes 152 46% 101% 111% 177% 107%1.210 hrs/Day 157 99% 174% 187% 277% 146%1.796 USD/Day 163 157% 253% 270% 386% 188%0.000 USD/Day 168 210% 326% 347% 486% 227%

none USD/Day 174 238% 364% 387% 539% 248%none USD/Day 179 238% 364% 387% 539% 248%none USD/Day 185 238% 364% 387% 539% 248%none USD/Daynone USD/Daynone USD/Day

2.017 USD/Day0.907 USD/Day1.145 USD/Day5.865 USD/Day0.058 USD/(Useable Ah Cycle)30% Premium over Lifeline 8D

mps now 4*Ah capacity.ulphation

Sensitivity Chart for Engine/Genset Rating



WM 8D Days Surr 1 Surr HTrojan WM S WM 8 WM 8D ### 10 15 20 25 30 3530% per Yea 13% 13% 19% 50% 52% 30% 46 -2% 0% 2% 4% 5% 6%20% 10 -6% -20% -19% -5% 15% 64% 50 1% 3% 5% 6% 7% 8%15% 15 -4% -16% -14% -3% 13% 57% 53 3% 5% 6% 7% 7% 8%12% 20 -2% -13% -11% -1% 12% 52% 57 3% 5% 6% 7% 7% 7%

9% 25 0% -10% -8% 1% 11% 48% 60 3% 5% 5% 6% 6% 7%8% 30 1% -8% -6% 2% 10% 44% 64 3% 5% 5% 6% 6% 6%8% 35 2% -6% -4% 4% 9% 41% 67 3% 5% 5% 6% 6% 7%8% 40 9% 2% 3% 16% 11% 39% 71 3% 5% 6% 6% 7% 7%8% 45 10% 2% 4% 19% 17% 37% 75 3% 5% 6% 6% 7% 7%9% 50 10% 3% 5% 23% 21% 35% 78 3% 5% 6% 6% 7% 7%9% 55 10% 4% 6% 26% 25% 33% 82 3% 5% 6% 7% 7% 7%9% 60 10% 5% 6% 28% 28% 32% 85 3% 5% 6% 7% 7% 7%

10% 75 11% 6% 8% 34% 37% 28% 89 3% 5% 6% 7% 7% 7%

10% 90 15% 11% 13% 43% 43% 26% 92 3% 5% 6% 7% 7% 8%10% 105 15% 11% 15% 46% 47% 26% 98 3% 5% 6% 7% 7% 8%10% 120 18% 14% 20% 51% 51% 29% 103 3% 5% 6% 7% 7% 8%

11% 135 16% 13% 19% 51% 52% 30% 109 3% 5% 6% 7% 7% 8%12% 150 14% 12% 18% 50% 52% 30% 114 2% 4% 6% 7% 7% 8%13% 165 14% 14% 20% 51% 52% 30% 119 1% 4% 5% 6% 7% 8%14% 180 13% 13% 19% 50% 52% 30% 125 0% 3% 4% 6% 6% 7%16% 195 13% 12% 18% 50% 52% 30% 130 -2% 1% 3% 4% 5% 6%20% 210 14% 13% 19% 50% 52% 30% 136 -4% -1% 1% 2% 3% 4%24% 225 13% 12% 18% 50% 52% 30% 141 -6% -4% -2% 0% 1% 2%30% 240 14% 13% 19% 51% 52% 30% 147 -8% -6% -5% -3% -2% -1%40% 255 13% 13% 19% 50% 52% 30% 152 -4% 1% 4% 8% 11% 14%

60% 270 13% 12% 18% 50% 52% 30% 157 2% 9% 15% 21% 27% 32%118% 285 13% 13% 19% 50% 52% 30% 163 5% 14% 23% 31% 39% 47%181% 300 13% 12% 18% 50% 52% 30% 168 8% 18% 28% 38% 48% 57%239% 315 13% 12% 18% 49% 52% 30% 174 9% 20% 30% 41% 51% 62%

270% 330 13% 13% 19% 50% 52% 30% 179 9% 20% 30% 41% 51% 62%270% 345 13% 12% 18% 50% 52% 30% 185 9% 20% 30% 41% 51% 62%270% 360 13% 13% 19% 50% 52% 30%

Days Aboard vs. Charge Capacity



40 45 50 55 60 75 90 105 120 135 150 165 180 195 210 225 240 255 270 28510% 11% 11% 11% 11% 12% 14% 14% 15% 14% 13% 13% 13% 13% 13% 13% 13% 13% 13% 13%11% 11% 11% 11% 11% 11% 13% 13% 14% 13% 12% 12% 12% 12% 12% 12% 12% 12% 12% 12%10% 10% 10% 10% 10% 10% 11% 11% 12% 11% 11% 11% 11% 11% 11% 11% 11% 11% 11% 11%9% 9% 9% 9% 9% 9% 10% 10% 10% 10% 9% 10% 9% 9% 9% 9% 9% 9% 9% 9%

8% 8% 8% 8% 8% 8% 8% 8% 9% 8% 8% 8% 8% 8% 8% 8% 8% 8% 8% 8%8% 8% 8% 8% 8% 8% 8% 8% 8% 8% 8% 8% 8% 8% 8% 8% 8% 8% 8% 8%8% 8% 8% 8% 8% 8% 8% 8% 9% 8% 8% 8% 8% 8% 8% 8% 8% 8% 8% 8%8% 8% 8% 8% 8% 8% 9% 9% 9% 9% 9% 9% 9% 8% 9% 8% 9% 9% 8% 9%8% 8% 8% 8% 8% 9% 9% 9% 9% 9% 9% 9% 9% 9% 9% 9% 9% 9% 9% 9%9% 9% 9% 9% 9% 9% 9% 9% 10% 9% 9% 9% 9% 9% 9% 9% 9% 9% 9% 9%9% 9% 9% 9% 9% 9% 10% 10% 10% 10% 9% 9% 9% 9% 9% 9% 9% 9% 9% 9%9% 9% 9% 9% 9% 9% 10% 10% 10% 10% 10% 10% 10% 9% 10% 9% 10% 10% 9% 10%9% 9% 9% 9% 9% 9% 10% 10% 10% 10% 10% 10% 10% 10% 10% 10% 10% 10% 10% 10%

9% 9% 9% 9% 9% 9% 10% 10% 11% 10% 10% 10% 10% 10% 10% 10% 10% 10% 10% 10%9% 9% 9% 9% 10% 10% 10% 10% 11% 10% 10% 10% 10% 10% 10% 10% 10% 10% 10% 10%

10% 10% 10% 10% 10% 10% 11% 11% 11% 11% 10% 10% 10% 10% 10% 10% 10% 10% 10% 10%

10% 10% 10% 10% 10% 10% 11% 11% 12% 11% 11% 11% 11% 11% 11% 11% 11% 11% 11% 11%10% 10% 10% 10% 11% 11% 12% 12% 12% 12% 11% 12% 11% 11% 11% 11% 11% 11% 11% 11%10% 11% 11% 11% 11% 11% 12% 12% 13% 13% 12% 12% 12% 12% 12% 12% 12% 12% 12% 12%11% 11% 11% 11% 11% 11% 13% 13% 14% 13% 13% 13% 12% 12% 13% 12% 13% 12% 12% 12%10% 11% 11% 11% 11% 12% 14% 14% 15% 14% 13% 13% 13% 12% 13% 13% 13% 13% 13% 13%10% 10% 11% 11% 11% 11% 14% 14% 16% 15% 13% 14% 13% 13% 13% 13% 14% 13% 13% 13%9% 10% 10% 10% 10% 11% 15% 15% 18% 16% 14% 14% 13% 13% 14% 13% 14% 13% 13% 14%8% 9% 9% 9% 9% 10% 16% 16% 20% 17% 14% 15% 13% 12% 14% 13% 14% 13% 13% 14%

26% 28% 29% 31% 32% 36% 46% 47% 55% 51% 47% 48% 47% 45% 47% 46% 48% 46% 45% 47%

48% 52% 56% 60% 64% 73% 90% 96% ### ### ### ### 99% 97% ### 98% ### 99% 98% ###67% 73% 80% 86% 92% ### ### ### ### ### ### ### ### ### ### ### ### ### ### ###80% 89% 97% ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ###86% 96% ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ###

86% 96% ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ###86% 96% ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ###

Sensitivity Chart for Days aboard/year(horizontal) vs. Charge capacity available (vertical)



300 315 330 345 36013% 13% 13% 13% 13%12% 12% 12% 12% 12%11% 11% 11% 11% 11%9% 9% 9% 9% 9%

8% 8% 8% 8% 8%8% 8% 8% 8% 8%8% 8% 8% 8% 8%8% 8% 9% 8% 9%9% 9% 9% 9% 9%9% 9% 9% 9% 9%9% 9% 9% 9% 9%9% 9% 9% 9% 10%

10% 10% 10% 10% 10%

10% 10% 10% 10% 10%10% 10% 10% 10% 10%10% 10% 10% 10% 10%

11% 11% 11% 11% 11%11% 11% 11% 11% 11%12% 12% 12% 12% 12%12% 12% 12% 12% 12%13% 12% 13% 13% 13%13% 13% 13% 13% 13%13% 13% 13% 13% 13%13% 12% 13% 13% 13%46% 45% 46% 45% 47%

98% 97% 99% 98% 99%### ### ### ### ###### ### ### ### ###### ### ### ### ###

### ### ### ### ###### ### ### ### ###



Battery Data BaseBattery Number 1 2 3 4 5

Model Lifeline 8D Surr 12CS11PS Surr HT8DM Trojan T105 WM SV1550

Battery Type AGM Flooded Flooded Flooded Flooded

Ah rate (20hr) 255 342 221 225 223

Battery Voltage 12 12 12 6 12

Cost ea (USD) 387 683 246 76 209

Cycle Life (50% DOD) 1000 3200 1250 500 200

Max. Life (est years) 8 20 10 6 6

Length (in) 20.62 22 20.75 10.38 20.62

Width (in) 10.95 11.25 11 7.13 10.95

Height (in) 10.17 18.25 10 11.2 10.17

Weight (lb) 158 272 164 62 131



6 7 8 9 10 11 12

WM 8D WM 8D Lifeline GPL4C Surr CH375 Surr 6CS17PM Trojan L16 WM 8GGC

AGM Gel AGM Flooded Flooded Flooded Gel

245 225 200 350 546 360 180

12 12 6 6 6 6 6

469 449 144 195 485 176 198

300 500 1000 1250 3200 650 1000

8 5 8 10 20 8 5

20.62 20.62 10.35 12.25 22 11.625 10.25

10.95 10.95 7.06 7.125 8.25 7 7.13

10.17 10.17 11.57 16.75 18.25 17.5625 10.88

161 158 55 117 221 113 72



13 14 15 16 17 18 19 20DETA N-Gel 60Ah ETA N-Gel 120A ETA N-Gel 145A Optima Yellow 34

Gel Gel Gel AGM

60 120 145 55

12 12 12 12

175 289.0350877 328.5087719 169

600 600 600 600

5 5 5 8

10.94488189 20.19685039 20.19685039 10

6.88976378 7.440944882 8.779527559 6.8

7.480314961 8.779527559 8.779527559 7.8

42.22222222 88.88888889 108.8888889 43.8



21 22 23 24 25 26 27 28 29 30



31 32 33 34 35 36 37 38 39 40



41 42 43 44 45 46 47 48 49 50



51 52 53 54



1.000

1.100

1.200

1.300

1.400

1.500

1.600

1.700

1.800

1.900

0.000 0.020 0.040 0.060 0.080 0.100 0.120 0.140 0.16

W

e i g h t F a c t o r ( A h / l b ) - m o r e i s b e t t e r

Amp-Hours per Cubic Inch of Battery (Ah/in^3) - more is better

Weight Factor vs. Volumetric Storage Efficiency

Lifeline 8D AGM

Surr 12CS11PS Flooded

Surr HT8DM Flooded

Trojan T105 Flooded

WM SV1550 Flooded

WM 8D AGM

WM 8D Gel



0.00000

0.50000

1.00000

1.50000

2.00000

2.50000

3.00000

3.50000

0.00 0.50 1.00 1.50 2.00 2.50

P u r c h a s e C o s t p e r C y c l e ( U S D / c y c l e ) - l e s s i s

b e t t e r

Purchase Cost per Amp-Hour (USD/Ah) - less is better

Purchase Cost per Amp-Hour vs. Purchase Cost per Cycle (50% DOD)

Lifeline 8D AGM


Surr HT8DM Flooded

Trojan T105 Flooded

WM SV1550 Flooded

WM 8D AGM

WM 8D Gel



L i f e c y c

l e c o s

t p r e m

i u

m o

v e r

L i f e l i n e

8 D

A G M

Lifecycle costs of other batteries relative to Lifeline 8D AGM vs.

0%

25%

50%

75%

100%

0 20 40 60 80 100 120

Amperes available to charge batterie


Surr HT8DM Flooded

Trojan T105 FloodedWM SV1550 Flooded

WM 8D AGM

WM 8D Gel



available charge amperes

140 160 180 200



L i f e c y c

l e c o s

t p r e m

i u

m o

v e r

L i f e l i n e

8 D

A G M

Lifecycle costs of other batteries relative to Lifeline 8D AGM v

-30%

-20%

-10%

0%

10%

20%

30%

40%

50%

60%

70%

0 15 30 45 60 75 90 105 120 135 150 165 180 195 210 225 240 2

Days Aboard per Year


Surr HT8DM Flooded

Trojan T105 FloodedWM SV1550 Flooded

WM 8D AGM

WM 8D Gel



. days aboard per year

5 270 285 300 315 330 345 360



Lifecycle costs of Surr 12CS11PS relative to Lif

L

i f e c y c

l e c o s

t p r e m i u

m o

v e r

L i f e l i n e

8 D

A G M

10

35

60

135

210

285

360-10%

0%

10%

20%

30%

40%

50%

4 6 5

7 6 7 7

8 8 9 1

0 3 1

1 9

1 3 6

1 5 2

1 6 8

1 8 5

Days AboardPer Year

Amperes availableto charge batteries



eline 8D

40%-50%

30%-40%

20%-30%

10%-20%

0%-10%

-10%-0%

If you want finer detail, click onthe vertical axis and select arange you are interested in.Any value over 50% istruncated for clarity, hence the"plateau"

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