Battery Bank Calculator

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off grid power output calculator

Calculates the minimum recommended battery bank size in amp-hours (Ah). Calculation is based on the power consumption of the system, voltage, target depth of discharge and desired length of backup power required. Enter the daily power consumption in Wh and check the other data (change if necessary).

Power consumption per day:
Days backup required:
Maximum depth of discharge:
Minimum battery bank size = Ah

Please remember that this calculator works out the 'minimum' battery bank size for a given power consumption. When using an inverter, the current draw on the battery side can be extremely high, so you may need a battery bank that is larger than the minimum. For example, 1200W drawn at 240V is only 5A, whereas at 12V this current increases to 100A. We recommend that you have a battery bank of at least 220Ah per 1000W and preferably 300-400Ah.

We have a range of hard-working 12V deep cycle batteries from Trojan and Platinum for your renewable energy system. Although many leisure batteries are described as deep cycle, we do not supply these, as they are not designed for heavy use.

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Off-Grid Power Requirements
Please complete this form with your specific requirements and we would be happy to put together a bespoke off-grid power system. We will recommend a solution using our own British made wind turbines, best-in-class solar panels and deep-cycle batteries.

Contact Information

Once we have assessed your requirements, our experts will call you to discuss the equipment you'll need to achieve your goals.

What Is The Application?

Please tell us as much as you can about your use case. We understand that you may not be able to answer all questions. We will call you to discuss your requirements in any case.

Device Name
Power Draw (W)
Peak Power Draw on Startup (W)
Standby Power (W)
Hours Active Per Day (W)
Days Per Week In Use (W)

Voltage Preference

Do you have a preference for the system voltage?

Outputs Required

Do you have a preference for the systems output?

Site Location

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Other Details

No. of days autonomy required

Is there anything else we should know?

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