Outback Power Systems EnergyCell RE Battery Owners Manual - Manual (Page 20)

Specifications
20 900-0127-01-00 Rev D
Ampere-Hour Capacity Based On Discharge Rate
The EnergyCell battery capacity is measured in amp-hours. The battery capacity is not a fixed number, but will
vary with conditions. (See page 8.) The figures in the tables below are used to measure the capacity of the
EnergyCell battery based on load size.
Battery capacity is judged by the number of amp-hours measured when a battery is discharged to a standard
voltage under load. This is known in the industry as “terminal voltage”. A commonly cited terminal voltage is
10.5 volts per 12-volt battery, or 1.75 volts per cell (Vpc). Another common value is 1.85 volts per cell; this value
is used when sizing batteries conservatively to avoid severely discharging them.
The amp-hours measured upon reaching terminal voltage also depend on the size of the load. A load capable of
discharging the battery in 1 hour is far larger than a load which takes 3, 4, or 5 hours. (8-hour loads, 12-hour
loads, etc. are progressively smaller in size.) As described on page 8, the battery has less capacity under larger
loads and more capacity under smaller loads.
Table 7 shows EnergyCell capacity at a terminal of voltage 1.75 Vpc. Table 8 shows EnergyCell capacity at a
terminal voltage of 1.85 Vpc.
Example: Under a 1-hour load, the EnergyCell 170RE has a capacity of only 89.1 amp-hours when measured to
1.75 Vpc in Table 7. Under a much lighter 100-hour load, the same battery has 170 amp-hours in Table 7, almost
twice that amount.
Other EnergyCell batteries are measured similarly.
Table 7 Amp-Hour Capacity to 1.75 Vpc @ 77°F (25°C)
Discharge in Hours
Model 1 2 3 4 5 6 7 8 10 12 20 24 48 72 100
34RE 19.7 23.6 26.1 28.0 29.0 29.6 30.1 30.1 31.1 31.7 33.0 33.1 - 33.8 34.0
52RE 29.6 35.1 38.9 41.4 43.3 44.6 45.4 46.0 47.2 48.0 50.0 50.4 - 51.8 52.0
78RE 43.5 53.2 58.5 62.0 64.5 66.6 68.6 69.6 71.0 72.0 75.0 75.6 - 77.6 78.0
95RE 47.0 58.0 66.0 70.8 74.0 76.2 78.0 79.2 81.7 83.6 88.0 88.8 - 93.0 95.0
106RE 49.2 61.5 70.0 76.0 80.6 84.0 86.8 89.0 92.0 94.2 100.0 101.0 - 104.0 106.0
170RE 89.1 - 114.2 120.6 125.9 - - 137.0 - 145.3 153.8 157.0 163.9 - 170.0
200RE 103.0 - 132.0 139.6 145.5 - - 158.4 - 168.0 178.0 181.4 189.6 - 200.0
200GH 120.0 - 148.5 154.8 159.0 - - 168.8 - 176.4 191.0 189.6 192.0 - 200.0
220GH 133.5 - 166.2 173.2 178.0 - - 188.8 - 198.0 214.0 216.0 - - 220.0
Table 8 Amp-Hour Capacity to 1.85 Vpc @ 77°F (25°C)
Discharge in Hours
Model 1 2 3 4 5 6 7 8 10 12 20 24 48 72 100
34RE 22.3 25.8 28.1 29.9 30.8 31.4 31.8 31.8 32.7 33.4 34.7 35.1 - 36.4 36.7
52RE 33.5 38.4 41.9 44.3 46.0 47.3 47.9 48.7 49.7 50.5 52.6 53.4 - 55.7 56.1
78RE 49.3 58.2 63.1 66.3 68.6 70.7 72.4 73.6 74.7 75.8 78.8 80.1 - 83.5 84.2
95RE 53.3 63.5 71.1 75.7 78.7 80.8 82.4 83.8 85.9 88.0 92.5 94.1 - 100.1 102.5
106RE 55.7 67.3 75.5 81.2 85.7 89.1 91.7 94.2 96.8 99.2 105.1 107.1 - 111.9 114.4
170RE 100.9 - 123.1 128.9 133.8 - - 144.9 - 153.0 161.6 166.4 176.8 - 183.4
200RE 116.7 - 142.3 149.2 154.7 - - 167.6 - 176.9 187.1 192.3 204.6 - 215.8
200GH 136.0 - 160.1 165.5 169.0 - - 178.6 - 185.7 200.7 200.9 207.2 - 215.8
220GH 151.3 - 179.2 185.2 189.2 - - 199.8 - 208.5 224.9 228.9 - - 237.4