Event Horizon - Load Calculation Work form
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Helpful Formulas: Watts = Volts times Amps; Amps = Watts divided by Volts
Step 1 Calculate your AC loads. If there are no AC loads, skip to Step 2.
Description of AC Loads Run by an inverter Watts X Hrs/Wk = WH/Wk
X =
X =
X =
X =
X =
X =
X =
X =
line 1 --> Total WH/Wk
2. Multiply line 1 by 1.25 to correct for inverter loss and battery efficiency.
3. Inverter DC input voltage; usually 12, 24 or 48 volts. This is DC system voltage.
4. Divide line 2 by line 3. This is total amp hours per week used by AC loads.

Step 2 Calculate your DC loads.
5. List all DC loads in the spaces below.
Description of DC Loads Watts X Hrs/Wk = WH/Wk
X =
X =
X =
X =
X =
X =
X =
X =
line 5 --> Total WH/Wk
6. DC system voltage. Usually 12, 24 or 48 volts.
7. Total amp hours per week used by DC loads. Divide line 5 by line 6.
8. Total amp hours per week used by AC loads from line 4
9. Add lines 7 and 8. This is total amp hours per week used by all loads.
10. Divide line 9 by 7 days. This is total average amp hours per day.

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