Zendure SolarFlow 4000 Mix AC+ — All-in-one

Zendure SolarFlow 4000 Mix AC+ ZDA2502-gy-eu

Photo from the manufacturer

All-in-one F3 · Flat-sized (3–8 kWh)

Zendure Zendure SolarFlow 4000 Mix AC+

Name: Zendure SolarFlow 4000 Mix AC+
Brand: Zendure
SKU: ZDA2502-gy-eu
Price: 1999.00 EUR
Availability: InStock
Author: JouleSpecs

Best value Flat-sized (3–8 kWh)

Manufacturer's list price

1999 € ≈ $2,159

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Data from official source

Sheet curated by JouleSpecs — We check every spec sheet against the manufacturer's own documentation: each value carries its source and the date we read it. Published Sept. 22, 2026 · Data verified Sept. 22, 2026

Zendure SolarFlow 4000 Mix AC+ is a storage unit that's added to an existing rooftop solar system, keeping the inverter and most of the wiring already there: it connects in alternating current to a third-party solar inverter, without replacing it, and can return more energy to the home grid than a system within balcony solar limits does. The share it feeds back can be increased by having an electrician hardwire it, within what local regulations allow.

It recognizes a power outage on its own and switches to the battery to power the loads connected to its dedicated emergency outlet, both day and night; if the solar system is still producing at that moment, it keeps charging the battery even while the grid is down. It doesn't power the whole home: only what's plugged into the emergency outlet gets power. The emergency outlet can also be activated by hand, with a double click on the panel button, without going through the app or the internet.

It also charges and discharges based on the energy price, when the utility makes it known: it draws from the grid during the cheapest hours and returns the stored energy when it costs more. The wheels are for pushing it sideways: it isn't built to move the short way. It's for anyone who already has panels and wants a residential-sized battery without touching the existing system; anyone looking for a small balcony storage unit with no solar system of their own needs a different device, built for that scope.

JouleSpecs Awards

Best value Flat-sized (3–8 kWh) · All-in-one

Best balance of technical score and price among the 3 sheets in the All-in-one category (flat-sized tier): list price €1999, technical score 79/100.

How we assign awards →

01 · Verified data

Technical specifications

Backup power UPS

Works without internet With limitations

Cost per kWh 200,00 €/kWh

midpoint of the estimated range — on nominal capacity

Round-trip efficiency 90 %

Standby consumption Zendure does not state it.

where we looked

Parameter	Value	Source
Weight	80.0 kg (176.4 lb)	manufacturer website
Nominal capacity	8 kWh	Declared by the brand
Continuous output	3680 W	Declared by the brand
Phases	Single-phase	Declared by the brand
Maximum charge power	4 kW	Declared by the brand
Backup power	UPS	Declared by the brand
Switchover time	10 ms	Declared by the brand
Grid charging	Yes	Declared by the brand
Dynamic tariffs	Built in	Declared by the brand
Rated cycles	10000 cicli	Declared by the brand
Capacity at end of cycle life	70 %	Declared by the brand
Warranty	10 anni	Declared by the brand
Round-trip efficiency	90 %	Declared by the brand
Ingress protection	IP65	Declared by the brand
Minimum temperature	-20 °C	Declared by the brand
Maximum temperature	55 °C	Declared by the brand
Works without internet	With limitations	Declared by the brand
Grid connection power	3 kW	Declared by the brand
Usable capacity	—	Not declared
Depth of discharge	—	Not declared
Cell chemistry	—	Not declared
Cell supplier	—	Not declared
Expandable	—	Not declared
Maximum expanded capacity	—	Not declared
Battery voltage	—	Not declared
Backup phases	—	Not declared
Black start	—	Not declared
EV charger integration	—	Not declared
Heat pump integration	—	Not declared
Virtual power plant	—	Not declared
Guaranteed throughput	—	Not declared
Guaranteed remaining capacity	—	Not declared
Standby consumption	—	Not declared
SPI index (HTW Berlin)	—	Not declared
HTW test edition	—	Not declared
Mounting	—	Not declared
Cell heating	—	Not declared
Noise level	—	Not declared
Local control	—	Not declared
Open protocols	—	Not declared
Home Assistant integration	—	Not declared
Where the data is hosted	—	Not declared
Remote updates	—	Not declared
App required for setup	—	Not declared
Declared standards	—	Not declared
Battery passport	—	Not declared
Carbon footprint	—	Not declared
Recycled content	—	Not declared

02 · The numbers

What it really costs

Cost per kWh 200 €/kWh midpoint of the estimated range — on nominal capacity

How we worked it out

price: 1600
nominal capacity: 8

Battery life cycles 3650 cycles warranty years

the manufacturer does not state the guaranteed total energy throughput, which for heavy users is often the limit that runs out first

How we worked it out

stated cycles: 10000
warranty years: 3650

Cost of stored energy 0.061 €/kWh warranty years

the manufacturer does not state the guaranteed total energy throughput, which for heavy users is often the limit that runs out first
on nominal capacity: the manufacturer does not state the usable figure, so the real cost is higher

How we worked it out

price: 1600
nominal capacity: 8
battery life cycles: 3650
round-trip efficiency: 90
energy delivered over the whole life: 26280

Energy density 100 Wh/kg

on nominal capacity: the manufacturer does not state the usable figure, so the true number is lower

How we worked it out

nominal capacity: 8
weight: 80

Power-to-capacity ratio 0.460 C

on nominal capacity: the manufacturer does not state the usable figure, so the true number is lower

How we worked it out

continuous power: 3680
nominal capacity: 8

These numbers are calculated, not stated: they have no source to cite, they have a formula you can redo. The price used is the manufacturer's list price, which is stable and the same in every country — not a shop's price on the day.

03 · Summary

Pros and cons

In favour

When power fails it switches to the battery on its own, and the emergency outlet can also be turned on by hand, without the app or the internet.
It adds the battery to a system that's already there, working alongside its inverter instead of replacing it. source
It charges from the grid when energy costs less and returns the stored energy when it costs more.
It can stay outdoors, in a sheltered spot: the casing is built to withstand rain and splashes.

Worth knowing

It weighs as much as two adults: mounting or moving it isn't a one-person job. source
Feeding back more than 3 kW to the grid needs an electrician to hardwire it, within what local regulations allow.
During a blackout it only powers what's plugged into its emergency outlet, not the home's regular outlets.

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