REV020620
SimpliPhi Power, Inc. | 3100 Camino Del Sol | Oxnard, CA 93030, USA | (805) 640-6700 |
| 10 |
the MAX Co
ntinuous Discharge Rate per PHI Battery (found in Table 1.0 or on the relevant battery’s
specification sheet).
(𝐿𝑜𝑎𝑑 𝑅𝑎𝑡𝑒) ÷ (𝑀𝐴𝑋 𝐶𝑜𝑛𝑡𝑖𝑛𝑢𝑜𝑢𝑠 𝐷𝑖𝑠𝑐ℎ𝑎𝑟𝑔𝑒 𝑅𝑎𝑡𝑒 𝑝𝑒𝑟 𝐵𝑎𝑡𝑡𝑒𝑟𝑦)
= 𝑀𝑖𝑛𝑖𝑚𝑢𝑚 𝐵𝑎𝑡𝑡𝑒𝑟𝑦 𝑞𝑢𝑎𝑛𝑡𝑖𝑡𝑦 𝑡𝑜 𝑝𝑟𝑒𝑣𝑒𝑛𝑡 𝑜𝑣𝑒𝑟𝑑𝑖𝑠𝑐ℎ𝑎𝑟𝑔𝑒
Example A: Three PHI 3.8 kWh-51.2V
nominal
batteries must be paired with an inverter rated at 5 kW AC and
92% efficiency to ensure the PHI Battery bank does not over-discharge to power the loads.
(5.4 𝑘𝑊 𝐷𝐶) ÷ (1.92 𝑘𝑊 𝐷𝐶) = 2.83 → 𝑟𝑜𝑢𝑛𝑑 𝑡𝑜 𝟑
Example B: Five PHI 3.8-25.6V
nominal
batteries must be paired with an inverter rated at 5 kW AC and 92%
efficiency to ensure the PHI Battery bank does not over-discharge to power the loads.
(5.4 𝑘𝑊 𝐷𝐶) ÷ (1.15 𝑘𝑊 𝐷𝐶) = 4.72 → 𝑟𝑜𝑢𝑛𝑑 𝑡𝑜 𝟓
Note: Notice that the two different model batteries in the above example (51.2V
nominal
and 25.6V
nominal
) have
the same capacity rating (3.8 kWh) but different MAX Continuous Discharge ratings. In applications where
greater instantaneous power is required of the battery, it is therefore more efficient to use the PHI 3.8
kWh-51.2V
nominal
battery with 1.92 kW of maximum continuous discharge versus the PHI 3.8 kWh-
25.6V
nominal
battery with 1.15 kW of continuous discharge. The same advantages apply when examining the
two different model batteries’ surge capacity.
Example A and Example B, compared:
𝑘𝑊 =
𝑉𝑜𝑙𝑡𝑠 × 𝐴𝑚𝑝𝑠
1,000
AC Load
DC Load
(inv eff =
92%)
PHI 3.8 kWh-51.2V MAX
Continuous Discharge
PHI 3.8 kWh-51.2V Surge
Discharge
Battery QTY
Needed to Meet
Load
Requirement
(Continuous)
Battery QTY
Needed to Meet
Load
Requirement
(10 min. Surge)
5 kW AC
5.4 kW DC
37.5 ADC
1.92 kW DC
60 ADC
3.072 kW DC
2.8
→
3
1.8
→
2
PHI 3.8 kWh-25.6V MAX
Continuous Discharge
PHI 3.8 kWh-25.6V Surge
Discharge
Battery QTY
Needed to Meet
Load
Requirement
(Continuous)
Battery QTY
Needed to Meet
Load
Requirement
(10 min. Surge)
5 kW AC
5.4 kW DC
45 ADC
1.152 kW DC
60 ADC
1.536 kW DC
4.7
→
5
3.5
→
4
Refer to the Battery Bank Sizing for Maximum Instantaneous Discharge (Load Rate) tables in Appendix B of
this Manual for a complete list of common battery-based inverters and the minimum quantity of PHI
Batteries those inverters need to be paired with to ensure that the PHI Battery bank does not over-
