Solosol Battery Sizing Worksheet
Use this form to determine what size battery
is required for your system.
| 1 | Total average amp hours per day from the System Loads Worksheet, line 10. | |||||||||||||||||
| 2 | Maximum number of continuous cloudy days expected in your area, (3 days is reasonable for Spain) | |||||||||||||||||
| 3 | Multiply line 1 by line 2. | |||||||||||||||||
| 4 | Divide line 3 by (maximum) 0.8 to maintain a 20%
reserve after deep discharge period. To prevent less than a maximum 80% discharge divide by a lesser number in #4 above. |
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| 5 | If no special conditions below apply, skip to line
10. Special Conditon #1: Heavy electrical load Maximum amperage that will be drawn by the loads for 10 minutes or more. |
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| 6 | Discharge rate of battery. If unknown, check with battery supplier. | |||||||||||||||||
| 7 | Multiply line 5 by line 6. | |||||||||||||||||
| 8 | Special condition
#2: High Charge Current Maximum output amperage of PV array or other battery charger. |
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| 9 | Multiply line 8 by 10.0 hours. | |||||||||||||||||
| 10 | Amp hours from line 4, 7, or 9, whichever is largest. | |||||||||||||||||
| 11 | If you are using a lead-acid battery, select the
multiplier below which corresponds to the battery's winter time
average ambient temperature:
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| Multiply line 11 by line 10. This is your optimum battery size in amp-hours. | ||||||||||||||||||
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Amp-hours of battery chosen. (Example: Concorde
1040T = 104Ah/24 hrs. and 120Ah/120 hrs. etc.) |
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| Divide line 12 by line 13. This is the total number of batteries in parallel required. | ||||||||||||||||||
| Round off to the next highest whole number. | ||||||||||||||||||
