Knowledge Base › Commercial Ess
Fortress Power FP-Nano-S8-O
Official manufacturer NA verified Sept. 25, 2026
Page 1 of Fortress Power eSpire Nano Data Sheet (English) (https://www.fortresspower.com/download/944/espire-nano/47949/fortress-power-espire-nano-data-sheet-english.pdf)
Identity
| category | commercial_ess |
| manufacturer | Fortress Power |
| model | FP-Nano-S8-O |
| product_status | active |
| region | NA |
| variant | outdoor |
Electrical
| battery_type |
LFP (Lithium Iron Phosphate)
Fortress Power eSpire Nano Data Sheet (English)
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| bms_integrated |
True
Fortress Power eSpire Nano Data Sheet (English)
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| cell_nominal_capacity_ah |
100
Fortress Power eSpire Nano Data Sheet (English)
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| chemistry | LiFePO4 (LFP) |
| cooling |
air
Fortress Power eSpire Nano
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| cycle_life | 6000 |
| dc_voltage_max_v |
460.8
Fortress Power eSpire Nano Data Sheet (English)
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| dc_voltage_min_v |
358.4
Fortress Power eSpire Nano Data Sheet (English)
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| dc_voltage_nominal_v |
409.6
Fortress Power eSpire Nano Data Sheet (English)
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| depth_of_discharge_pct | 95.0 |
| max_charge_current_a |
100
Fortress Power eSpire Nano Data Sheet (English)
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| max_discharge_current_a |
100
Fortress Power eSpire Nano Data Sheet (English)
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| nominal_capacity_ah | 100.0 |
| nominal_energy_kwh |
40.96
Fortress Power eSpire Nano Data Sheet (English)
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| nominal_voltage_v | 51.2 |
| official_product_url |
https://www.fortresspower.com/products/espire-nano/
Fortress Power eSpire Nano — inventory record source_url
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| operating_voltage_max_v | 57.6 |
| operating_voltage_min_v | 44.8 |
| pack_configuration |
1P128S
Fortress Power eSpire Nano Data Sheet (English)
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| phase_count | 3 |
| rack_configuration |
8
Fortress Power eSpire Nano Data Sheet (English)
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| rated_battery_capacity_kwh |
40
Fortress Power eSpire Nano Data Sheet (English)
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| topology |
cabinet
Fortress Power eSpire Nano
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| warranty_years |
10
Fortress Power eSpire Nano
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Physical / mechanical
| depth_mm |
1125
Fortress Power eSpire Nano
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| height_mm |
2220
Fortress Power eSpire Nano
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| mounting | 19-inch Rack / Wall-mount |
| weight_kg |
880
Fortress Power eSpire Nano
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| width_mm |
735
Fortress Power eSpire Nano
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Environment
| ip_rating |
IP55 (IP20 w/ indoor option)
Fortress Power eSpire Nano
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| operating_temperature_max_c |
50
Fortress Power eSpire Nano
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| operating_temperature_min_c |
-20
Fortress Power eSpire Nano
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Interfaces & connectors
| communication | CAN, RS485 |
Documents
installation_manual
Fortress Power eSpire Nano Installation Manual (Battery)
installation_manual
Fortress Power eSpire Nano Installation Manual (Inverter)
product_page
Fortress Power eSpire Nano
Additional documented parameters
Recorded verbatim from the source; no schema field exists for these yet.
| builder_completeness | partial |
| region_notes | North American commercial and industrial product (60 Hz, UL-listed line); Fortress Power is a US manufacturer. |