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Nelpuni Energy · Portable energy

Choose a battery and solar panels for your needs.

Tell us what you want to power and for how long. We help you compare options and understand what still needs checking before you buy.

Calculate my needs → See how we assess options →

Visible sources. Clear limits. No in-house physical tests.

Preparing your calculation…

Find a battery for your devices

We have selected an example. Change anything you do not use.

See my result ↓

Which devices will you use?

Power use and connection ↓

Camper compressor fridge (12 V) · DC / USB

Equivalent compressor hours; actual consumption depends on its duty cycle.

45 WEstimated surge ~158W
Power use and connection ↓

Charging 2 phones and a tablet · DC / USB

30 W
Power use and connection ↓

Camper / tent LED lighting (12 V) · DC / USB

15 W
Power use and connection ↓

Camper water pump (12 V pressure) · DC / USB

40 WEstimated surge ~80W

Count the days without recharging. You can add solar panels later.

Add another device ↓
Power use and connection ↓

Air fryer · 230V AC

1500 W
Power use and connection ↓

Capsule coffee maker (Nespresso / Dolce Gusto) · 230V AC

1400 W
Power use and connection ↓

Portable induction hob · 230V AC

1800 W
Power use and connection ↓

Compact microwave · 230V AC

1100 WEstimated surge ~1540W
Power use and connection ↓

Home fridge-freezer (230 V) · 230V AC

Equivalent compressor hours; actual consumption depends on its duty cycle.

120 WEstimated surge ~600W
Power use and connection ↓

Fibre router + ONT (internet) · 230V AC

15 W
Power use and connection ↓

Medical CPAP machine · 230V AC

45 W
Power use and connection ↓

Laptop (MacBook / PC) · DC / USB

65 W
Power use and connection ↓

Starlink · AC supply · 230V AC

45 W
Power use and connection ↓

External 27" monitor (remote work) · 230V AC

35 W
Power use and connection ↓

Stationary diesel heater (12 V) · DC / USB

35 WEstimated surge ~112W
Power use and connection ↓

Hair dryer / straightener · 230V AC

1600 W
Power use and connection ↓

Quiet 12 V / USB fan · DC / USB

15 W

Missing an appliance?

Add your appliances. Press a card to edit it. Startup and connection compatibility remain unverified.

How we estimate energy use ↓

Adjust daily operating hours. Efficiency assumptions: DC 95% and AC 85% , with 15 W inverter consumption over 24 hours if AC loads are present. Check each appliance's voltage and port.

Prefer to start with an example? ↓

Your scenario, in plain language

Some batteries have enough capacity for your usage time; further checks are needed.

23 options have enough battery capacity for the time you entered. Before choosing, check the cables and what happens when your devices start up.

See these options ↓

Before choosing, check connections, startup and operating conditions. Capacity alone does not guarantee that your appliances will work.

Your car-powered or USB appliances need a compatible connection. Check their ports in the result.

Show the energy and power calculation ↓
Connected power
130W
4 active appliances
DC / USB supply
No AC
Check voltage and per-port limits
Estimated daily consumption
566Wh/day
Includes losses and idle consumption
Required nominal capacity
~629Wh
Assumption: 90% usable capacity
Inverter loss breakdown+0 Wh/day

No AC inverter is required. Estimated DC efficiency is 95%; connectors, voltages and per-port limits still need verification.

AC and DC startup, assessed separatelyNo AC loads

No AC startup increase has been modelled. This does not verify DC load startup or your appliances' actual behaviour.

DC/USB appliances are active. A fridge or pump may need its own startup surge: check the surge, duration and port limit. A 0 W AC surge does not mean there is no DC startup surge.

I already have panels: wattage simulation ↓
Solar estimate (75% efficiency assumption)

Select your solar panel power to estimate the peak sun hours (PSH) needed to replace daily consumption:

With a panel rated at 200W (effective output of ~150W):~3.8 PSH to replace daily consumption
Assign your DC/USB appliances to specific ports ↓

This check uses documented limits and data you declare about the appliance and cable. A checked box is not a physical test. Empty fields remain unknown. All assigned loads are assumed simultaneous; assigning two appliances to the same port does not verify a compatible splitter. Editing watts here does not change consumption until you press “Apply these watts to consumption”. If you do not know a value, leave it pending: we do not turn uncertainty into compatibility.

Connection result: specific checks are missing. This result does not change energy or make the model fully suitable.

Camper compressor fridge (12 V)

We use 45 W as declared data or a working estimate. Unsure of the power? Retain this assumption and find the W on the appliance label; you can correct it in the advanced details.

How will you connect this appliance? Check the cable: USB-A is rectangular, USB-C is oval and DC is usually a 12 V socket. If unsure, choose “I don't know” and consult the label or manual.

Label data and advanced details ↓
  • Assign one physical output to this appliance.

Next step for Camper compressor fridge (12 V)

  1. Identify the output in the model's manual and assign it above.
  2. Check cable and startup with the manufacturer; only complete what you can confirm. If data is missing, retain “I don't know”.
  3. Consult the port sources at the end of this panel and check the result again.
Charging 2 phones and a tablet

We use 30 W as declared data or a working estimate. Unsure of the power? Retain this assumption and find the W on the appliance label; you can correct it in the advanced details.

How will you connect this appliance? Check the cable: USB-A is rectangular, USB-C is oval and DC is usually a 12 V socket. If unsure, choose “I don't know” and consult the label or manual.

Label data and advanced details ↓
  • Assign one physical output to this appliance.

Next step for Charging 2 phones and a tablet

  1. Identify the output in the model's manual and assign it above.
  2. Check cable and startup with the manufacturer; only complete what you can confirm. If data is missing, retain “I don't know”.
  3. Consult the port sources at the end of this panel and check the result again.
Camper / tent LED lighting (12 V)

We use 15 W as declared data or a working estimate. Unsure of the power? Retain this assumption and find the W on the appliance label; you can correct it in the advanced details.

How will you connect this appliance? Check the cable: USB-A is rectangular, USB-C is oval and DC is usually a 12 V socket. If unsure, choose “I don't know” and consult the label or manual.

Label data and advanced details ↓
  • Assign one physical output to this appliance.

Next step for Camper / tent LED lighting (12 V)

  1. Identify the output in the model's manual and assign it above.
  2. Check cable and startup with the manufacturer; only complete what you can confirm. If data is missing, retain “I don't know”.
  3. Consult the port sources at the end of this panel and check the result again.
Camper water pump (12 V pressure)

We use 40 W as declared data or a working estimate. Unsure of the power? Retain this assumption and find the W on the appliance label; you can correct it in the advanced details.

How will you connect this appliance? Check the cable: USB-A is rectangular, USB-C is oval and DC is usually a 12 V socket. If unsure, choose “I don't know” and consult the label or manual.

Label data and advanced details ↓
  • Assign one physical output to this appliance.

Next step for Camper water pump (12 V pressure)

  1. Identify the output in the model's manual and assign it above.
  2. Check cable and startup with the manufacturer; only complete what you can confirm. If data is missing, retain “I don't know”.
  3. Consult the port sources at the end of this panel and check the result again.

Corrected the power? Applying it recalculates energy and candidates with your current hours; it does not verify cables, startup or compatibility.

Consult port limits and sources ↓
Show the numbers for comparing batteries ↓

You need approximately 566 Wh per day and 629 nominal Wh for 1 day without recharging.

Calculated daily consumption566Wh/dayIncludes modelled losses and consumption
DC / USB supplyNo ACCheck voltage and per-port limits
Nominal capacity required~629WhWith 90% DoD allowance
23 options cover the energy; 23 with checks still pending.

Check what still needs checking for each option. We do not guarantee that all your devices will work or that medical equipment will keep running without interruption.

How it is calculated and what needs checking ↓

Assumptions: AC 85%, DC 95%, inverter 15 W for 24 h/day if AC loads are present, usable capacity 90%, margin 15%. Fridge compressor hours do not reduce AC availability time. All active AC loads are assumed simultaneous, with one startup modelled at a time. Solar: 75% and 4.5 PSH for guidance; recharging does not reduce required runtime. Prices are references without a verified current offer.

Filters:
✎ Edit appliances ↑

Budget does not filter the options: we need offers with verified total cost, availability and validity. Historical prices do not confirm that a battery is within your budget.

1. Choose a battery for your usage

Ordered by sufficient capacity and numerical criteria; no forced winner.

EcoFlow RIVER 2 Pro
EcoFlow

EcoFlow RIVER 2 Pro

Battery for your planned days
Meets the estimate
AC power
Not required in this scenario
When devices start up
Needs checking
Cables and plugs
Needs checking
View capacity and power ↓

Why consider it: 768 nominal Wh compared with 629 Wh required; 7.8 kg. Its AC power does not determine suitability for your DC loads.

Documented ports and specific checks ↓
  • 1 × 12.6 V vehicle socket: 126 W per port, 12.6 V; shared group 126 W.
  • 2 × 12.6 V DC5521: 38 W per port, 12.6 V; shared group 126 W.
  • 1 × 100 W USB-C PD: 100 W per port, 5/9/12/15/20 V.
  • 3 × 12 W USB-A: 12 W per port, 5 V.
  • Assign each appliance to a compatible output; do not add ports as if they were one output. Check cables, simultaneous power and the actual fridge or pump startup.
  • Check appliance voltage, connector and start-up; vehicle socket and DC5521 share 126 W.
  • Confirm original EFR620 version: do not apply these figures to RIVER 2 Pro 700 or a revision with different ports.

Provisional candidate · DC assignments and simultaneous limits still need checking · Check connectors, voltage and power for each DC port · DC startup unverified

European RIVER 2 Pro: 768 Wh, 800 W continuous output and 7.8 kg; declared full recharge in 70 minutes.

Weight, specifications and other details ↓
Capacity768 Wh
AC inverter800 W
Cost / capacityNo verified current offer
Density98.5 Wh/kg
Transfer verification pending3000 cycles
Observed price, subject to conditions:
Price awaiting verification
Read the review

Contents of this offer: verification pending. Do not assume panels are included. Check the retailer’s variant; maximum solar input does not describe package contents.

Check stores ↗

Shop awaiting verification · EcoFlow RIVER 2 Pro: confirm the European variant and package contents. Verification pending: European variant price, shop, date, taxes, delivery and terms. The old catalogue reference is not used for sorting, budget filters or €/Wh calculations.

A new-condition offer for this model still needs checking.

Bluetti AC70
Bluetti

Bluetti AC70

Battery for your planned days
Meets the estimate
AC power
Not required in this scenario
When devices start up
Needs checking
Cables and plugs
Needs checking
View capacity and power ↓

Why consider it: 768 nominal Wh compared with 629 Wh required; 10.2 kg. Its AC power does not determine suitability for your DC loads.

Documented ports and specific checks ↓
  • 1 × 12 V vehicle socket: 120 W per port, 12 V.
  • 2 × 100 W USB-C PD: 100 W per port, 5/9/12/15/20 V.
  • 2 × 12 W USB-A per port (manual): 12 W per port, 5 V.
  • Assign each appliance to a compatible output; do not add ports as if they were one output. Check cables, simultaneous power and the actual fridge or pump startup.
  • Confirm the two USB-A ports' shared limit: manual indicates 5 V/2.4 A per port and the page 12 W total.
  • Confirm independent transient peak: official pages mix 1,500 and 2,000 W; 2,000 W Power Lifting does not establish start-up.
  • AC70: ECO enabled by default; check threshold and time settings before maintaining small loads. Descriptive 40 W is not a universal threshold; FAQ: AC 10–30 W, DC 5–10 W and 1–4 hours, default time unknown. Check SOC (recharge below 5%) and discharge between -20 and 40 °C with thermal protection. Nominal 1,000 W documented; operating conditions pending.
Operating conditions still need checking ↓
  • AC70: ECO is enabled by default and can switch off AC/DC with low or zero load. The manual mentions below 40 W or the configured value, and permits AC settings of 10–30 W, DC of 5–10 W and 1, 2, 3 or 4 hours. Check or disable ECO for small loads; neither a universal threshold nor the default time is established.
  • AC70: check battery state and temperature; recharge immediately below 5% SOC, and at 0% switch off and recharge before restarting. Discharge between -20 and 40 °C with thermal protection; these states are not represented by the calculation.

Provisional candidate · Operating conditions unverified: check ECO, battery and temperature for the model · DC assignments and simultaneous limits still need checking · Check connectors, voltage and power for each DC port · DC startup unverified

European AC70: 768 Wh and 1,000 W continuous output; Power Lifting is a mode limited to resistive loads.

Weight, specifications and other details ↓
Capacity768 Wh
AC inverter1000 W
Cost / capacityNo verified current offer
Density75.3 Wh/kg
UPS: up to 20 ms; check your load3000 cycles
Observed price, subject to conditions:
Price awaiting verification
Read the review

Contents of this offer: verification pending. Do not assume panels are included. Check the retailer’s variant; maximum solar input does not describe package contents.

Check stores ↗

Shop awaiting verification · Bluetti AC70: confirm the European variant and package contents. Verification pending: European variant price, shop, date, taxes, delivery and terms. The old catalogue reference is not used for sorting, budget filters or €/Wh calculations.

A new-condition offer for this model still needs checking.

Anker SOLIX C800 Plus
Anker

Anker SOLIX C800 Plus

Battery for your planned days
Meets the estimate
AC power
Not required in this scenario
When devices start up
Needs checking
Cables and plugs
Needs checking
View capacity and power ↓

Why consider it: 768 nominal Wh compared with 629 Wh required; Weight awaiting verification. Its AC power does not determine suitability for your DC loads.

Documented ports and specific checks ↓
  • Check voltage, connector and continuous power for each DC/USB output in the manual.
  • Assign each appliance to a compatible output; do not add ports as if they were one output. Check cables, simultaneous power and the actual fridge or pump startup.
  • Nominal 768 Wh capacity agrees for original C800 Plus / A1754 between the EU page shared with C800 / A1753 and Specifications, page 8 of the A1754 EN/UK manual; excludes expansion and does not establish all energy as usable. Standard C800 data is not transferred to the Plus.
  • Normal 1200 W AC output is documented at 230 V and 50 Hz without numerical conflict between the two sources. Physical correspondence to the continental variant and operating conditions remain unverified; therefore decision-engine continuous output remains unverified, without guaranteeing unconditional service.
  • The A1754 EN/UK manual depicts British sockets; it does not certify continental sockets or any specific physical unit. Check code, plugs and actual configuration before evaluating compatibility.
  • The 12-hour standby shuts down the product only with no load detected and output buttons off; duration adjustable in the app (manual, page 3). With no AC plug detected for more than 15 minutes, it shuts down (page 4); not a universal consumption threshold. Screen shutdown after 30 seconds does not demonstrate output shutdown.
  • At 1% battery SOC it warns to recharge; 30% and quarterly charging concern storage maintenance, not a service derating threshold. Discharging between -20 and 40 °C and charging between 0 and 40 °C; with a thermal warning stop use and wait for recovery, with no documented numerical power derating curve.
  • SurgePad supports certain specified appliances up to 1600 W while delivering rated output; activates automatically above the rating and excludes bypass and equipment with strict voltage requirements. Not normal continuous 1600 W output or a peak with established duration; no specific reduced voltage established.
  • Check AC/DC/USB ports, solar input, charging, weight, dimensions, chemistry, cycles, app, warranty and UPS/EPS separately. Price, stock, coupon, ASIN, reviews and appliance compatibility remain unverified; no physical test.

Provisional candidate · DC assignments and simultaneous limits still need checking · Check connectors, voltage and power for each DC port · DC startup unverified

A camper station with 768 Wh, 1,200 W and rechargeable camping LED lights integrated into the lid.

Weight, specifications and other details ↓
Capacity768 Wh
AC inverter1200 W
Cost / capacityNo verified current offer
DensityPending
Transfer verification pendingCycles still need verification
Observed price, subject to conditions:
Price awaiting verification
Read the review

Contents of this offer: verification pending. Do not assume panels are included. Check the retailer’s variant; maximum solar input does not describe package contents.

Check stores ↗

Shop awaiting verification · Anker SOLIX C800 Plus: confirm the European variant and package contents. Verification pending: European variant price, shop, date, taxes, delivery and terms. The old catalogue reference is not used for sorting, budget filters or €/Wh calculations.

A new-condition offer for this model still needs checking.

Optional recharging

Would you like to recharge with solar panels?

Choose a battery first. Then you can look for solar panels and check the cable. Recharging does not reduce the battery capacity you need for your planned days.

Choose a battery above. We will use your energy use and required runtime to show its solar options here.

After your calculation

Check your candidates.

Add up to three models from the results or catalogue. Compare energy, power, weight, connections and outstanding checks before consulting the seller.

Open comparison →

Understand before deciding

Why does it discharge even in sunlight?

Explore the balance between input and consumption in an illustrative battery. The simulator explains energy; the calculator checks your needs and potential equipment.

Explore the educational simulator →

The Nelpuni approach

A useful answer.
Even when it is
“we don't know yet”.

How we work and how we are funded →
01

Needs before products.

Your consumption defines the options. An insufficient station does not become a recommendation.

02

Evidence before promises.

Visible sources, variants and limits. A manufacturer's product page is not a physical test.

03

Independence before commission.

Commercial links are identified. Commissions should not decide what suits you.

Before choosing

Understanding changes the decision.

01 / Power and capacity

W to start.
Wh to keep going.

Watts indicate the power you can supply at the same time. Watt-hours describe available energy; runtime also depends on losses and actual consumption.

02 / Service life

Cycles need
context.

Check chemistry, capacity threshold and test conditions. Declared cycles do not guarantee a lifespan in years or certify every use.

03 / Charging

The quick figure
does not tell everything.

Distinguish 0–80% from 0–100%. Review mode, temperature, input limits and included accessories before comparing times.

Questions worth asking.

What is the difference between a LiFePO4 battery and a conventional lithium one?

LiFePO4 is also a lithium-ion chemistry. Compare declared cycles and their conditions in each model's documentation: they do not equal guaranteed years. Temperature, storage and use affect ageing; every battery requires following the manufacturer's safety instructions.

Can I use an air fryer or Nespresso coffee machine with these stations?

It depends on the appliance. Check its nominal and start-up power, the station's continuous output and other simultaneous loads. A 1,800 W inverter does not ensure compatibility with every coffee machine or air fryer. Special reduced-voltage modes do not equal more continuous power.

How long does a full recharge with solar panels take?

It depends on the missing energy, irradiation, losses and solar input limit. As a theoretical example, 1,000 Wh divided by a constant 400 W is 2.5 hours before losses; this is not an observed recharge time. Also check voltage, current and connectors of the panel and station.

Is an all-in-one portable station better than a fixed camper installation with a secondary battery and relay?

A station can simplify portable use and a fixed installation can better suit permanent loads. Compare capacity, power, charging and the complete budget. If you modify the vehicle or install fixed wiring, confirm your installation requirements with an ITV centre or competent professional.

Your next decision starts with a question.

Calculate my needs ↑