Evo Outdoor Power System Calculator
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🌟 Evo Outdoor Power System Calculator

📝 How to Use This Calculator

Enter details for each component of your power system – appliances, battery bank, solar array, inverter, and cost savings. Use your own specifications or check with suppliers. If any section is incomplete, the calculator will suggest suitable components. Hover over the i icons next to labels for extra guidance.

  • Include a safety margin (default 25%) to cover inefficiencies.
  • The calculator will flag voltage mismatches (e.g. a 12V DC appliance on a 24V system) and suggest corrective actions.
  • See the Cost Savings tab to estimate how much you could save compared to grid energy (default rate £0.31/kWh).

⚙️ System Specifications & Appliances

🔌 Appliances

Device
Voltage (V)
Running (W)
Surge (W)
AC?
Hours/Day
Action

🔋 Battery Bank Setup

☀️ Solar Array Setup

i

⚡ Inverter Setup (Optional)

If inverter details are incomplete, we’ll suggest a suitable inverter based on your AC load.

💷 Cost Savings

This value is used to estimate how much you would save by generating your own energy with solar.

❓ Frequently Asked Questions

Q1: What does "Days of Autonomy" mean? 🤔

It’s the number of days your battery system can run without additional charging.

Q2: Why is a safety margin important? ⚠️

It covers inefficiencies, battery aging, and unexpected loads to ensure reliable operation.

Q3: What is the difference between Wh and Ah? 🔋

Watt-hours (Wh) measure the total energy consumed or stored, while amp-hours (Ah) indicate battery capacity. To convert, divide Wh by the system voltage (Ah = Wh ÷ V). For example, in a 24V system, 2400 Wh equals 100 Ah.

Q4: What if my inverter input voltage doesn’t match my system battery voltage? 🔄

Ensure the inverter’s input voltage matches your system’s battery voltage, or use a step-up/down converter. Mismatches can lead to inefficient operation.

Q5: How do I choose between series and parallel battery configurations? 🔋

Series increases voltage while parallel increases capacity. Your choice depends on your system’s needs and the specifications of your appliances.

Q6: How are solar controller recommendations made? ☀️

If you don’t provide controller specs, the calculator recommends one based on your panel data – ensuring the controller’s current rating meets the total output of your panels and its voltage matches your system.

Q7: How are cost savings calculated? 💷

Your daily solar production (in kWh) multiplied by your grid cost (£/kWh) gives your daily savings, which can be annualized.

Q8: Can I print or save the report? 🖨️

Yes, click the "Print / Save as PDF" button to use your browser’s print function.