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Deep Cycle AGM Marine Battery Sizing Calculator

This calculator is designed to calculate DC loads to DC battery banks +/- a battery.
To compute AC loads to DC battery banks, click here
Input values in this grey box and click "Calculate" to populate other values on the page.

Enter Load Voltage


Appliances, Inverters, Etc.

Enter Load Amperage

Amp Meter Reading (instant amps)
Measured by multimeter: Appliances, Inverters, Etc.
Amperage input at voltage rating chosen above.


Instant watt usage
amps x volts (grey) = watts

Hourly Amp Hours Used @ volts = ah

Hourly Amp Hours Used @ 12v
ah

Daily Amp Hours Used @ 12v
24 Hours - ah

Weekly Amp Hours Used @12v
7 days -ah

Monthly Amp Hours Used @12v
30 days - ah


This calculator computes the number of batteries needed for any application +/- a battery. System is set to +20% (ah X 1.2) to account for wire resistance, resulting voltage loss, heat, and other DC system inefficiencies.

For Critical Applications, battery sizing should be a starting point. Unusual circumstances call for an additional 100-500+ ah battery bank.

The computation does not account for losses of up to half ampacity for colder temperatures OR increased self discharge in warmer climates and on older batteries.

System does not account for amperages outside battery possible limits.

As a battery chemically transforms from fully charged to discharged, it's voltage drops from 13.5 - 10.5 volts for a 12 volt battery. As the voltage drops this affects the amount of amps required to drive a load. (Watts law: amps x volts = watts)
13.5 volts x 10.00 amps = 135 watts
10.5 volts x 12.86 amps = 135 watts
As such, this calculator is for sizing purposes only. All systems should be thoroughly tested as they are installed to insure that the battery bank is appropriate for the load on site.

AGM Batteries are not harmed by high amperage charge and discharge so long as the input voltage is carefully regulated.
Charge 12 volt batteries at 13.2 - 14.4 volts
Charge 6 volt batteries at 6.6 - 7.2 volts
Avoid over charging and remove from charger immediately (or divert to other load - PV, renewable). Over charged batteries will have a unnaturally short lifespan. AGM batteries are not affected by higher current charging as GEL and Flooded batteries can be.

Lifeline Battery Part #Batteries Necessary for Reserve Power
@ 50% Depth of Discharge

GPL-24T
5 hour reserve = Batteries, +/- 1
12 hour reserve = Batteries, +/- 1
1 day reserve = Batteries, +/- 1
3 day reserve = Batteries, +/- 1
5 day reserve = Batteries, +/- 1

GPL-27T
5 hour reserve = Batteries, +/- 1
12 hour reserve = Batteries, +/- 1
1 day reserve = Batteries, +/- 1
3 day reserve = Batteries, +/- 1
5 day reserve = Batteries, +/- 1

GPL-31T
5 hour reserve = Batteries, +/- 1
12 hour reserve = Batteries, +/- 1
1 day reserve = Batteries, +/- 1
3 day reserve = Batteries, +/- 1
5 day reserve = Batteries, +/- 1

GPL-30HT
5 hour reserve = Batteries, +/- 1
12 hour reserve = Batteries, +/- 1
1 day reserve = Batteries, +/- 1
3 day reserve = Batteries, +/- 1
5 day reserve = Batteries, +/- 1

GPL-4DL

or
GPL-4DA
5 hour reserve = Batteries, +/- 1
12 hour reserve = Batteries, +/- 1
1 day reserve = Batteries, +/- 1
3 day reserve = Batteries, +/- 1
5 day reserve = Batteries, +/- 1

GPL-8DL

or
GPL-8DA
5 hour reserve = Batteries, +/- 1
12 hour reserve = Batteries, +/- 1
1 day reserve = Batteries, +/- 1
3 day reserve = Batteries, +/- 1
5 day reserve = Batteries, +/- 1

GPL-U1T
5 hour reserve = Batteries, +/- 1
12 hour reserve = Batteries, +/- 1
1 day reserve = Batteries, +/- 1
3 day reserve = Batteries, +/- 1
5 day reserve = Batteries, +/- 1

GPL-4CT
5 hour reserve = Batteries, +/- 1
12 hour reserve = Batteries, +/- 1
1 day reserve = Batteries, +/- 1
3 day reserve = Batteries, +/- 1
5 day reserve = Batteries, +/- 1

GPL-6CT
5 hour reserve = Batteries, +/- 1
12 hour reserve = Batteries, +/- 1
1 day reserve = Batteries, +/- 1
3 day reserve = Batteries, +/- 1
5 day reserve = Batteries, +/- 1

GPL-L16T

GPL-L16T Marine Battery
5 hour reserve = Batteries, +/- 1
12 hour reserve = Batteries, +/- 1
1 day reserve = Batteries, +/- 1
3 day reserve = Batteries, +/- 1
5 day reserve = Batteries, +/- 1

GPL-31T-2V

GPL-31T-2V Marine Battery
5 hour reserve = Batteries, +/- 1
12 hour reserve = Batteries, +/- 1
1 day reserve = Batteries, +/- 1
3 day reserve = Batteries, +/- 1
5 day reserve = Batteries, +/- 1

GPL-4CT-2V

GPL-4CT-2V Marine Battery
5 hour reserve = Batteries, +/- 1
12 hour reserve = Batteries, +/- 1
1 day reserve = Batteries, +/- 1
3 day reserve = Batteries, +/- 1
5 day reserve = Batteries, +/- 1

GPL-6CT-2V

GPL-6CT-2V Marine Battery
5 hour reserve = Batteries, +/- 1
12 hour reserve = Batteries, +/- 1
1 day reserve = Batteries, +/- 1
3 day reserve = Batteries, +/- 1
5 day reserve = Batteries, +/- 1

GPL-L16T-2V

GPL-L16T-2V Marine Battery
5 hour reserve = Batteries, +/- 1
12 hour reserve = Batteries, +/- 1
1 day reserve = Batteries, +/- 1
3 day reserve = Batteries, +/- 1
5 day reserve = Batteries, +/- 1

Marine Battery Information:

Marine Battery Introduction
Deep Cycle Marine Battery Specifications
Marine Starting Battery Specifications
Marine Battery Sizing Calculator DC-DC
Marine Battery Sizing Calculator AC-DC
Marine Battery Distributors
Marine Battery Manual
Marine Battery Short Circuit and Internal Resistance Specifications


Material Safety Data Sheet
marine batteries

NOTICE: The technical battery data contained herein has been reviewed and approved for general release on the basis that it contains no export controlled information. No part of this site may be copied or reproduced by any means, including electronic or mechanical, without written permission from Concorde Battery Corporation and Lifeline Batteries.

DISCLAIMER: The technical data contained herein is based upon the best information available as of the latest revision date. Concorde Battery Corporation the Manufacturer of Lifeline Batteries, makes no warranty of merchantability, fitness for any particular purpose, or any other warranty, expressed or implied, with respect to such information. Both Concorde Battery and Lifeline Battery assume no liability resulting from its use. It is the obligation of each user of the product to determine the suitability for any particular application, including marine battery and RV battery installation procedures, to comply with the requirements of all applicable laws regarding use and disposal of this product.

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