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Buffalo Phone: 716.531.4875 Denver Phone: 303.800.4725 Fax: 303.600.9726
BD Batteries - Buffalo, New York & Denver, Colorado - Deep Cycle AGM Batteries Delivered Nationwide
Lifeline Batteries, Total Power Batteries, Rock Racing Battery Line, Optima Battery Lines & Sun Xtender Batteries

Deep Cycle RV & Marine Battery Sizing Calculator - DC

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

Amps of Electricity used Continuously
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 @ 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 RV Battery GPL-24T 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-27T RV Battery GPL-27T 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 RV Battery GPL-31T 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-4DL RV Battery GPL-4DL Marine Battery or GPL-4DA RV Battery GPL-4DA 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-8DL RV Battery GPL-8DL Marine Battery or GPL-8DA RV Battery GPL-8DA 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-U1T RV Battery GPL-U1T 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 RV Battery GPL-4CT 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 RV Battery GPL-6CT 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

BD Batteries - A Broomfield-Designers Company
Serving the Local Colorado Community 9-5 Mountain & Emergencies P. 303-800-4725 F. 303-600-9726
Serving the Buffalo and the Great Lakes Communities 9-5 Eastern & Emergencies P. 716-531-4875 Mailing Address: 5023 West 120th Ave. #138, Broomfield, CO 80020
OUR DENVER WAREHOUSE IS MOVING TO A NEW LOCATION AT THIS TIME.
WE WERE SCHEDULED TO REOPEN OUR BRICK AND MORTAR BATTERY WAREHOUSE
IN EARLY 2011. IN THE MEAN TIME OUR WEBSITE AND PHONES OPERATE FINE!

We do thank the public for the outreach of concern, and votes of confidence.
Do call Lorene prior to schedule used battery pickups, new battery dropoffs, etc. by appointment.

Corporate Accounts, Vendors, Installers, Electricians, and others interested in setting up an account.

Custom Battery Search

BD Batteries
Buffalo, New York
Denver, Colorado
716-531-4875
303-800-4725

BD Batteries is an Upfront Merchant on TheFind. Click for info.

BD Batteries, Denver Battery Distributor

Official Battery Distributor for:
Lifeline Battery, Sun Xtender Battery, Total Power Battery, and Rock Racing Batteries.

AGM Batteries, AGM Battery Chargers, Deep Cycle Batteries, DC Fuses, DC Firewall Pass Throughs, Battery Terminals, Battery Cables, DC Diodes, and Special Order Flooded Crown Batteries!

Automotive Battery Directory Broomfield-Designers Custom Database and Website

The information contain on this deep cycle AGM batteries website is deemed reliable, but not guaranteed. Please verify specific information on marine AGM batteries, rv AGM batteries or auto AGM batteries listed here by calling us direct. We are proud to offer the highest quality AGM batteries and hope you will consider using our deep cycle AGM batteries in the near future!

Deep Cycle Batteries : Marine Batteries | RV Batteries | AGM Batteries

Buffalo Phone: 716.531.4875 Denver Phone: 303.800.4725 Fax: 303.600.9726 BD Batteries - Buffalo, New York & Denver, Colorado - Deep Cycle AGM Batteries Delivered Nationwide Lifeline Batteries, Total Power Batteries, Rock Racing Battery Line, Optima Battery Lines & Sun Xtender Batteries

Deep Cycle RV & Marine Battery Sizing Calculator - DC

Enter Load Voltage

Enter Load Amperage

AGM Batteries Available

Shipping, Safety, and Legal

AGM Battery Applications and Benefits

AGM Battery Installation Considerations

AGM Batteries, AGM Battery Chargers, Deep Cycle Batteries, DC Fuses, DC Firewall Pass Throughs, Battery Terminals, Battery Cables, DC Diodes, and Special Order Flooded Crown Batteries!

Buffalo Phone: 716.531.4875 Denver Phone: 303.800.4725 Fax: 303.600.9726
BD Batteries - Buffalo, New York & Denver, Colorado - Deep Cycle AGM Batteries Delivered Nationwide
Lifeline Batteries, Total Power Batteries, Rock Racing Battery Line, Optima Battery Lines & Sun Xtender Batteries