|
LOAD CALCULATION SHEET |
|
|
|
|
|
|
|
|
Northwest Power Co. |
|
|
|
|
http://www.nwpwr.com |
|
|
|
|
|
|
|
|
|
|
|
|
|
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 |
equals |
WH/Wk |
|
|
|
|
|
|
X |
|
equals |
|
|
|
|
|
|
|
X |
|
equals |
|
|
|
|
|
|
|
X |
|
equals |
|
|
|
|
|
|
|
X |
|
equals |
|
|
|
|
|
|
|
X |
|
equals |
|
|
|
|
|
|
|
X |
|
equals |
|
|
|
|
|
|
|
X |
|
equals |
|
|
|
|
|
|
|
X |
|
equals |
|
|
|
|
|
|
|
X |
|
equals |
|
|
|
|
|
|
|
X |
|
equals |
|
|
|
|
|
|
|
X |
|
equals |
|
|
|
|
|
|
|
X |
|
equals |
|
|
|
|
|
|
|
X |
|
equals |
|
|
|
|
|
|
|
|
|
|
|
| 1. |
|
|
|
|
line 1 |
|
Total WH/Wk |
|
|
|
|
|
|
|
|
|
|
|
|
2. Multiply line 1 by 1.25 to correct for
inverter loss and battery efficiency. |
|
1.25 |
|
|
|
|
|
|
|
|
|
|
|
|
3. Inverter DC input voltage; usually
12,24, or 48 volts. This the DC system |
|
Voltage = |
|
|
|
|
|
|
|
|
|
|
|
|
4. Divide line 2 by line 3. This is your
total amp hours per week used by AC loads |
|
|
|
|
|
|
|
|
|
|
|
|
| Step 2 |
|
|
Step 2 Calculate your DC Loads |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
5. List all DC loads in the spaces below. |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Description of DC Loads |
|
|
WATTS |
X |
Hrs/WK |
equals |
WH/Wk |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
X |
|
equals |
|
|
|
|
|
|
|
X |
|
equals |
|
|
|
|
|
|
|
X |
|
equals |
|
|
|
|
|
|
|
X |
|
equals |
|
|
|
|
|
|
|
X |
|
equals |
|
|
|
|
|
|
|
X |
|
equals |
|
|
|
|
|
|
|
X |
|
equals |
|
|
|
|
|
|
|
X |
|
equals |
|
|
|
|
|
|
|
X |
|
equals |
|
|
|
|
|
|
|
|
|
|
|
| 5. |
|
|
|
|
line 5 |
|
Total WH/Wk |
|
|
|
|
|
|
|
|
|
|
|
|
6. DC system voltage. Usually 12, 24 or 48
volts. |
|
|
|
Voltage = |
|
|
|
|
|
|
|
|
|
|
|
|
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 the total amp
hours per week used by all loads |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
10. Divide line 9 by 7 days. This is total
average amp hours per day. |
|
Divide by 7 |
|
