Standalone Power Supply Solution
Standalone Power Supply Solution
Customer: Senegal — site to be confirmed (Dakar / region) Subject: response to the equipment list to be powered Date: 22 September 2026 — Version 1.0
Direct answer (executive summary)
Your equipment list has been converted into an actual electrical load, then matched against our product range. Here is the conclusion:
Recommended configuration: 1 × EP12000L (11 kW single-phase) + 1 × EP12000B extension battery, with ≈ 4.6 kWp of solar panels.
Why this configuration, and not another:
|
Constraint of your installation |
Calculated value |
EP12000L capability |
Margin |
|
Continuous load, all appliances running at the same time |
4.2 kW |
11 kW (230 V single-phase) |
2.6 × |
|
Start-up surge (well pump starting + kettle + cooling) |
≈ 7.5 – 9 kW |
22 kW peak |
2.4 – 2.9 × |
|
Estimated daily consumption |
≈ 15.9 kWh/day |
7,680 Wh (EP12000L) + 11,776 Wh (EP12000B) = 19,456 Wh |
≈ one full day of autonomy, with solar recharging in parallel |
The most critical point of your installation is not the running power, but the start-up surge of the well pump: an electric motor draws 3 to 4 times its rated power during the fraction of a second after it starts. A low-cost 5 kW generator stalls on that surge; the EP12000L absorbs it effortlessly thanks to its pure sine wave inverter (THD < 3%).
1. Analysis of the requested load
1.1 Equipment declared by the customer
|
# |
Equipment |
Qty |
Unit power (assumption) |
Total continuous power |
Start-up surge |
|
1 |
12 W LED bulbs |
10 |
12 W |
120 W |
— |
|
2 |
40" flat-screen TVs |
2 |
75 W |
150 W |
— |
|
3 |
Fans (standing / ceiling) |
4 |
70 W |
280 W |
≈ 1.5 × (motor) |
|
4 |
Refrigerator |
1 |
150 W |
150 W |
≈ 3 × = 450 W |
|
5 |
Freezer 6,000 L (large volume, commercial use) |
1 |
600 W |
600 W |
≈ 3 × = 1,800 W |
|
6 |
Electric kettle |
1 |
1,800 W |
1,800 W |
— |
|
7 |
Well water pump (submersible / surface) |
1 |
1,100 W |
1,100 W |
≈ 3 – 4 × = 3,300 – 4,400 W |
|
|
TOTAL |
|
|
4,200 W (4.2 kW) |
≈ 7.5 – 9 kW (transient) |
⚠️ Assumptions to be confirmed by the customer — the unit power figures above are typical market values, not nameplate ratings. The three most sensitive values are: the actual power of the well pump (make, model, single-phase/three-phase, immersion depth), the power of the 6,000 L freezer, and the power of the kettle. Confirming these three points will finalise the sizing — see § 10.
1.2 Reading the load
Three different types of load coexist:
|
Load type |
Equipment concerned |
Technical implication |
|
Resistive loads (simple) |
10 bulbs, 1,800 W kettle |
No particular constraint. The kettle is the largest continuous consumer (1.8 kW). |
|
Inductive / motor loads (critical) |
Well pump, 4 fans, refrigerator and freezer compressors |
Require a pure sine wave. A "modified sine wave" output causes overheating, humming and accelerated motor wear. The EP12000L delivers a pure sine wave, THD < 3%. |
|
24/7 cycling loads (these size the battery) |
Refrigerator + 6,000 L freezer |
Their compressors do not run continuously (duty cycle ≈ 40 – 50% in a hot climate), but they determine night-time autonomy: they are the ones that must keep running when solar production stops. |
2. Sizing verification
2.1 Power (can the system carry the load?)
|
Test |
Calculation |
Result |
|
Continuous simultaneous load |
120 + 150 + 280 + 150 + 600 + 1,800 + 1,100 |
4,200 W |
|
EP12000L capacity, 230 V single-phase |
— |
11,000 VA |
|
Continuous power verdict |
4,200 W out of 11,000 W |
✅ 2.6 × margin — no risk of overload, even with every appliance running permanently |
|
Maximum transient surge (pump starting while the kettle and cooling appliances run) |
4,400 + 1,800 + 600 + 150 + 280 + 150 + 120 |
≈ 7,500 W (up to 9 kW if a compressor starts simultaneously) |
|
EP12000L peak, 230 V single-phase |
— |
22,000 VA |
|
Surge verdict |
≈ 9,000 W out of 22,000 W |
✅ 2.4 × margin — the pump can start without cutting power to the rest of the house |
2.2 Energy (how long without grid or sun?)
Estimated daily consumption, taking into account real duty cycles (cooling appliances do not draw rated power 24/7; the kettle and pump are intermittent):
|
Item |
Calculation |
Consumption / day |
|
Lighting (10 × 12 W, 10 h in the evening) |
120 W × 10 h |
1.2 kWh |
|
Televisions (2 × 75 W, 6 h) |
150 W × 6 h |
0.9 kWh |
|
Fans (4 × 70 W, 10 h) |
280 W × 10 h |
2.8 kWh |
|
Refrigerator (150 W, 40% duty cycle) |
150 W × 24 h × 0.40 |
1.4 kWh |
|
Freezer 6,000 L (600 W, 45% duty cycle) |
600 W × 24 h × 0.45 |
6.5 kWh |
|
Kettle (1,800 W, 30 min/day) |
1,800 W × 0.5 h |
0.9 kWh |
|
Water pump (1,100 W, 2 h/day) |
1,100 W × 2 h |
2.2 kWh |
|
TOTAL |
|
≈ 15.9 kWh/day |
3. Recommended configuration
3.1 Composition
|
Reference |
Description |
Qty |
Role |
|
EP12000L |
Portable power station — integrated bidirectional inverter + battery |
1 |
Core of the system: 230 V / 50 Hz supply + storage + solar charging |
|
EP12000B |
Extension battery, 11,776 Wh |
1 |
Doubles autonomy to cover a full day |
|
DSF / DS Series |
Solar panels ≈ 4.6 kWp (e.g. 8 × 580 W) |
1 set |
Main daytime charging source (Senegal: very high solar irradiation) |
3.2 EP12000L technical specifications
(Source: EP12000 移动电源参数 V1.8 — final specification sheet)
|
Parameter |
Value |
|
Rated power (230 V single-phase) |
11,000 VA |
|
Peak power (single-phase) |
22,000 VA |
|
Single-phase output voltage |
220 / 230 / 240 V |
|
Frequency |
50 / 60 Hz → compatible with the Senegalese grid (230 V / 50 Hz) |
|
Output waveform |
Pure sine wave, THD < 3% (essential for the pump and compressors) |
|
Built-in battery (EP12000L) |
LiFePO₄, 7,680 Wh, 150 Ah (51.2 V), 3,000 cycles to 80% capacity |
|
Extension battery (EP12000B) |
LiFePO₄, 11,776 Wh, 230 Ah (51.2 V) |
|
Scalability |
Up to 31 stackable batteries → 372 kWh in total |
|
Parallel operation |
2 stacked units → up to 24 kVA continuous output (no extra parallel kit required) |
|
High-voltage solar charging (single-phase) |
80 – 450 VDC, 2 × 20 A max, 2 × 5,500 W PV, up to 7,500 W to the battery → full charge in 70 min |
|
Low-voltage solar charging |
12 – 150 VDC, max 12,000 W → full charge in 7 h |
|
Grid / generator charging |
180 – 250 VAC, 16/32 A max, 7,000 W max → full charge in 70 min |
|
UPS function |
Grid ↔ battery transfer in ≤ 10 ms |
|
Operating temperature |
Discharge: −20 °C to 50 °C / Charge: 0 °C to 45 °C |
|
Protection rating |
Unit IP43 / Battery pack IP66 |
|
AC outputs |
(10 – 50 A × 4 – 5) + 63 A × 1 (or 32 A × 1 in parallel) |
|
DC / USB outputs |
XT90 12 V/30 A, cigarette lighter 12 V/10 A, 2 × 5521 12 V/6 A, 2 × USB, 2 × QC3.0, 2 × Type-C PD 140 W, 2 × 5 – 15 W wireless charging |
|
Monitoring |
LCD panel + mobile app (start, stop, real-time parameter monitoring) |
|
Chassis |
4-wheel and large-roller modes switchable at any time, integrated handles, all-round rubber bumpers |
|
Warranty |
5 years |
|
Certifications |
Compliant with EU and US safety standards |
Dimensions: 840 × 670 × 490 mm — 100 / 110 kg (EP12000L main unit).
4. Autonomy — three practical scenarios
Usable capacity assumed at 90% of nominal (a depth of discharge that preserves LiFePO₄ service life).
|
Scenario |
Load drawn |
EP12000L alone (7,680 Wh) |
EP12000L + EP12000B (19,456 Wh) |
|
A. Everything running simultaneously (kettle + pump + cooling + lighting + 2 TVs + 4 fans) |
4.2 kW |
≈ 1 h 40 |
≈ 4 h 10 |
|
B. Real evening usage (cooling on duty cycle + 10 bulbs + 4 fans + 2 TVs + occasional kettle) |
≈ 800 W average |
≈ 8 h 40 |
≈ 21 h 30 |
|
C. Cooling only, night without sun (refrigerator + 6,000 L freezer, on duty cycle) |
≈ 330 W average |
≈ 21 h |
≈ 53 h (≈ 2 days) |
|
D. Full daily consumption (≈ 15.9 kWh/day, § 2.2) |
15.9 kWh |
0.4 day |
≈ 1 full day — with solar recharging in parallel during the day |
In practice: with 1 × EP12000L + 1 × EP12000B, your installation runs 24/7: during the day, solar recharges the battery while it supplies the house; at night, the battery takes over. If there is no sun for several consecutive days, the UPS function allows recharging from the grid (or a generator) in only 70 minutes.
5. Charging — how the system recharges
|
Source |
Availability in Senegal |
Performance |
Recommendation |
|
Solar (primary) |
Very high irradiation (≈ 5,000 – 5,500 Wh/m²/day) — among the best in the world |
Up to 7,500 W to the battery → 70 min (high voltage) |
✅ Source no. 1: near-zero running cost |
|
Grid |
Available but subject to outages / load shedding |
7,000 W max → 70 min |
✅ Backup charging, especially during the rainy season |
|
Fuel generator |
Common as backup |
7,000 W max → 70 min |
✅ Emergency solution (far more economical than today: it only runs to recharge, not to supply the loads) |
|
Wind |
Low potential outside coastal areas |
Up to 2,000 W |
Option, not a priority |
Recommended solar sizing
|
Requirement |
Calculation |
Recommended PV power |
|
Cover 100% of daily consumption (≈ 15.9 kWh) |
15.9 kWh ÷ 4.5 h of useful sunshine ÷ 0.78 (system losses) |
≈ 4.6 kWp (e.g. 8 × 580 W) |
|
Cover essential uses only (≈ 8 kWh: cooling + lighting + fans) |
8 kWh ÷ 4.5 h ÷ 0.78 |
≈ 2.3 kWp (e.g. 5 × 450 W) |
The EP12000L accepts up to 2 × 5,500 W of high-voltage panels (single-phase): the 4.6 kWp configuration is directly compatible and remains expandable.
6. Recommended connection layout
|
Circuit |
Connected loads |
Continuous power |
Note |
|
Circuit 1 — Cooling (absolute priority) |
Refrigerator + 6,000 L freezer |
750 W (surge 2,250 W) |
Run permanently; these loads tolerate an outage least (cold chain, goods) |
|
Circuit 2 — Well pump |
Water pump |
1,100 W (surge 4,400 W) |
Dedicated circuit: prevents the pump surge from disturbing other equipment |
|
Circuit 3 — Lighting / comfort |
10 bulbs + 4 fans + 2 televisions |
550 W |
The most heavily used circuit in the evening |
|
Circuit 4 — Kettle |
Electric kettle |
1,800 W |
Intermittent use; avoid synchronising it with pump start-up (the EP12000L handles it, but this preserves the battery) |
7. Option comparison
|
Option |
Configuration |
Continuous power |
Peak |
Stored capacity |
Verdict |
|
A — Recommended |
EP12000L + 1 × EP12000B |
11 kW |
22 kW |
19,456 Wh |
✅ Best fit: 2.6 × margin on the load, a full day of autonomy, expandable |
|
B — Economical |
EP12000L alone |
11 kW |
22 kW |
7,680 Wh |
✅ Sufficient for power; partial autonomy (≈ 8 h in real use) — daily recharging required |
|
C — Low budget |
EP6000LS |
6 kW |
12 kW |
5,376 Wh |
⚠️ Works but the margin drops to 1.4 ×: the user must avoid starting the pump at the same time as the kettle and compressors |
|
D — Scalable / whole building |
2 × EP12000L in parallel |
up to 24 kVA |
— |
expandable to 372 kWh |
✅ For future expansion (workshop, air conditioning, additional buildings) |
|
E — Supplementary |
EP5000iL |
5 kW |
10 kW |
3,430 Wh |
⚠️ Not sufficient alone for the full simultaneous load; usable as a supplementary unit or for a subset (lighting + TVs + fans) |
Why the EP12000L rather than the EP6000LS?
Both models can power your equipment list. The difference comes down to simultaneous start-ups:
- EP6000LS (6 kW / 12 kW): works
only if
the kettle, the pump and both compressors do not start at the same time. That is a usage constraint that must be imposed on the user every day.
- EP12000L (11 kW / 22 kW): works
in every case
, with no usage constraint. This is the recommended choice for an installation where the user should not have to monitor their appliances.
8. Why this solution suits the Senegalese context
|
Local constraint |
Technical answer |
|
230 V / 50 Hz single-phase grid |
The EP12000L delivers 220/230/240 V at 50/60 Hz — compatible without a transformer |
|
Frequent outages and load shedding |
Built-in UPS function: grid ↔ battery transfer in ≤ 10 ms, invisible to the freezer and refrigerator (no break in the cold chain) |
|
High temperatures (30 – 45 °C) |
Discharge range up to 50 °C; patented dual-channel cooling system |
|
Harmattan dust and coastal humidity |
Battery pack IP66, unit IP43; handles and rubber bumpers all around |
|
Motor start-up (pump, compressors) |
Pure sine wave, THD < 3% + 22 kW peak |
|
Exceptional solar resource |
Solar charging up to 7,500 W → 70-minute full charge, near-zero running cost |
|
Remote site or growing business |
4-wheel chassis switchable to 2-wheel mode, integrated handles: the unit can be moved, deployed and expanded (up to 372 kWh) |
9. Frequently asked questions (FAQ)
1. Can the 1,800 W kettle, the pump and both compressors start at the same time? Yes. The combined transient surge is estimated at between 7.5 and 9 kW, well below the EP12000L's 22 kW peak. With the EP6000LS (12 kW peak), that simultaneity would be risky.
2. How long is the 6,000 L freezer powered during an outage? About 21 hours with the EP12000L alone (cooling-only mode), and up to 53 hours with the EP12000B extension battery. As the UPS transfer is ≤ 10 ms, the compressor does not even restart: the cold chain is never interrupted.
3. How much solar panel area is needed? About 4.6 kWp (for example 8 × 580 W panels) to cover the estimated daily consumption of ≈ 15.9 kWh. A reduced 2.3 kWp version is enough if you prioritise cooling, lighting and fans.
4. Can the system last several days without sun or grid? With 1 × EP12000L + 1 × EP12000B, autonomy in real use is about 21 h 30, and up to 2 days in cooling-only mode. For several days of autonomy across all loads, simply add EP12000B extension batteries (up to 31 units, i.e. 372 kWh).
5. Is it compatible with the Senegalese grid? Yes: single-phase output 220/230/240 V — 50/60 Hz, and AC input 180 – 250 VAC. No adapter or transformer is needed.
6. What exactly happens during an outage? The system automatically transfers from grid to battery in less than 10 ms. Bulbs do not flicker, fans do not stop, televisions do not reboot, and the cooling compressors do not lose their cycle.
7. Can batteries or a second inverter be added later? Yes. Up to 31 extension batteries (372 kWh in total), and two stacked EP12000L units deliver up to 24 kVA without any additional parallel kit.
8. What is the service life and what maintenance is required? The LiFePO₄ battery is rated for 3,000 cycles to 80% capacity, with a 5-year warranty. No heavy maintenance: no fuel, no oil changes, no manual starting. Monitoring is done from the mobile app (state of charge, power, alerts).
10. Points to confirm in order to finalise the configuration
To turn this proposal into a final configuration and quotation, three values must be confirmed:
|
# |
Information to confirm |
Why it is decisive |
How to check |
|
1 |
Well water pump: power (W or hp), single-phase or three-phase, submersible or surface, depth |
It is the no. 1 sizing constraint (surge × 3 – 4). A 2.2 kW pump instead of 1.1 kW would push the surge to ≈ 9 kW on its own |
Motor nameplate, or a photo of the plate |
|
2 |
6,000 L freezer: compressor power, supply voltage |
Determines daily consumption (the heaviest item in the energy balance: 6.5 kWh/day) and therefore the solar size |
Appliance nameplate |
|
3 |
Electric kettle: actual power |
Ranges from 1,200 to 2,200 W depending on the model |
Appliance nameplate |
Additional useful information:
- Desired autonomy in hours (e.g. "last 8 h per day without grid", or "autonomous 24/7");
- Site location (to refine solar sizing: Dakar, Saint-Louis, Casamance…);
- Whether a stable grid connection exists, a generator, or neither;
- Estimated daily hours of pump operation.
Annex — Sources of technical data
The product characteristics quoted in this document come from the manufacturer's internal specification sheets:
|
Source document |
Element used |
|
EP12000 移动电源参数 V1.8-定稿 |
Power ratings, voltages, battery capacities, charging inputs, IP rating, temperatures, outputs |
|
EP12000 移动电源介绍 V1.3 |
Functional description, stacking, parallel operation, applications |
|
EP12000 移动电源优势 V1.2 |
Product advantages (cooling, chassis, UPS, warranty, certifications) |
|
EP6000 移动电源参数 V1.5-定稿 / EP6000 移动电源介绍 V1.1 |
Specifications of the EP6000LS option |
|
EP5000iL 移动电源参数 V1.0 |
Specifications of the EP5000iL option |
|
DPiL 系列参数汇总 V2.8 / EP3600 / BP3600 / BP2400 参数 |
Range comparison |
Methodological note: the unit power ratings of the customer's equipment (§ 1.1) are market assumptions used for pre-sizing, not measured values. Autonomy calculations are based on a usable depth of discharge of 90% and on compressor duty cycles of 40 – 45%, which are usual values in a hot climate. Confirming the nameplate data (§ 10) will finalise these figures.
Document prepared by the sales team — any technical question on the sizing will be answered within 24 hours.