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>Common Battery Sizes
Batteries are often referred to by a "group" number. This table offers a listing of some the styles of batteries commonly used in renewable energy systems.
| Battery Type | Examples | Amp-hour Capacity (C20 rate) | Nominal Voltage | Weight (lbs) | Dimensions (Inches) |
| U1 | 8AU1H | 33 | 12 | 24 | 8.5 x 5 x 7 |
| Group 24 | 8A24, UB24, 8G24 | 75 | 12 | 54 | 11 x 7 x 10 |
| Group 27 | 8A27, 8G27 | 92 | 12 | 63 | 13 x 7 x 10 |
| Group 31 | 8A318G31, | 105 | 12 | 70 | 13 x 7 x 10 |
| Group 4D | 8A4D, UB4D | 200 | 12 | 130 | 20 x 8 x 10 |
| Group 8D | 8A8D, UB8D | 250 | 12 | 160 | 21 x 11 x 11 |
| Golf Cart battery* | Trojan T-105 | 225 | 6 | 62 | 10 x 7 x 11 |
| L16* | 8L16, TroL16 | 400 | 6 | 120 | 12 x 7 x 17 |
* Indicates flooded lead-acid battery.
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