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Power Estimator

Use this quick step by step guide to help determine the right size battery for your Deep Cycle needs.
Type in your requirements in the text fields below and follow the steps after pressing continue:

Step 1: Work out the power needed for 12V appliances


Appliance: Brand / Model: Voltage: Number of
appliances:		 Amps per
appliance1:		 Average hours
of use per day:		 Amp Hours (Ah)
per day @12VDC:		  
n/a remove
n/a remove
n/a remove
n/a remove
n/a remove

1. Amps = Watts / Volts




Step 2: Add a power inverter to run the 240V appliances and view your total power demands.

No inverter required.

Power Inverter:
Brand / Model2
Amp Hours (Ah)
per day @12VDC required:		 n/a

2. Check Amps power rating on inverter model

Total Power Demands:
Daily Power Demand (Ah): n/a
Total Daily Power Demand (Ah): n/a




Step 3: Choose quality batteries that provide enough power.


Daily Battery Capacity (Ah) to 80% Depth of Discharge3: Number of Days Unit Recharge (Daily = 1): Total Power Required Until Recharge (Ah)4: Battery: Type: Ah Rating: Number of Batteries Required: Total Battery Capacity Amp Hours (Ah)5:

3. Deep cycle batteries should not be discharged below 20% state of charge.
4. Total should not exceed 460Ah.
5. Total should be greater than "Total Power Required Until Recharge(Ah)".




Step 4: Choose a charger that will easily recharge your batteries.


Recommended charging method selection guide (Based on recharging a 12 Volt battery over 12-15 hours)
Total Battery Capacity
Amp Hours (Ah)		 Solar Panel Charger (240 Volt) Generator (12 Volt)
60-80 Watt 80-100 Watt Up to 5 Amps 5-10 Amps 15-20 Amps 40 Amps 40-60 Amps 80-100 Amps
45 to 55 Ah yes yes yes yes     yes  
65 to 70 Ah   yes   yes yes   yes yes
75 to 85 Ah   yes   yes yes yes yes yes
95 to 115 Ah         yes yes   yes
115 to 200 Ah           yes   yes
200 to 400 Ah               yes
Greater than 400 Ah Seek assistance from a qualified auto electrical service provider

NOTE: Based on recharging from approximately 30% state-of-charge. Lead acid batteries should be charged at the lowest current appropriate for the rated capacity.
Quick charging only charges the surface of the battery plates and can increase the chance of overheating and lead to permanent battery damage.

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