Every EcoFlow STREAM Model, Compared

Pros

• +Cheapest entry to the STREAM range by a wide margin
• +IP67 weatherproof and fanless, so silent
• +Two MPPT channels, so two panels facing different directions each get optimised independently
• +A STREAM AC Pro can store its output later through the house wiring

Cons

• −On its own it isn't a verified plug-in device: its only register record is the PV type, and the plug-in route needs one of EcoFlow's verified kits
• −No storage, so surplus generation is exported for nothing (most DIY installs can't qualify for SEG payments)
• −We can't confirm that the DIY cable in the box carries a BS 1363 plug

Pros

• +The entry battery unit that still takes panels directly
• +Lightest of the battery models at 22 kg
• +Same 1.92 kWh capacity and app as the dearer models

Cons

• −EcoFlow's FAQ: in off-grid mode it can't discharge through the AC outlet, though it can still charge from the PV port. In a power cut, your stored energy is stranded
• −Only 2 MPPT inputs and 1,000W of solar input (figures from EcoFlow's EU page; the UK page has no Max spec block)
• −Out of stock at EcoFlow UK on 8 October 2026, and not on the STREAM series page

Pros

• +Three MPPT inputs cover most real balcony layouts (two on the railing, one on the wall, say)
• +1,500W of solar input (500W × 3) is plenty for a UK balcony, where panels rarely reach their rating
• +Discharges off-grid at up to 1,200W, unlike the Max

Cons

• −Priced at or above the Ultra on EcoFlow UK (14 November 2026), which adds a fourth MPPT and 500W more input
• −Out of stock on 8 October 2026: EcoFlow UK's page said “STREAM PRO Shipping in 1 Month”
• −1.92 kWh fills up fast on a sunny day if you're out at work, so expect clipped generation in summer

Pros

• +Same 4 MPPT, 2,000W solar front end as the Ultra X
• +Off-grid AC output for power cuts
• +The only STREAM model on EcoFlow UK's series page on 8 October, in stock

Cons

• −1.92 kWh is small for 2,000W of input. On a good day it's full by lunchtime
• −When the sale ends, the gap to the Ultra X narrows enough that the X is the better buy
• −Cloud-dependent app, and EcoFlow UK says it must be hardwired by an electrician

Pros

• +3.84 kWh, double the other first-generation models, to match the 2,000W solar input
• +Big enough to make smart-tariff arbitrage worthwhile (charge cheap overnight, discharge at peak)
• +4 MPPT inputs handle four panels in four different orientations

Cons

• −At 38.8 kg, this is a two-person lift and a serious object on a small balcony
• −Its UK page says set-up “requires no electrician”, which contradicts EcoFlow's other STREAM pages; plan on an electrician
• −Payback stretches past 8–10 years at typical UK self-consumption rates; buy it for what it does, not for a spreadsheet win

Pros

• +EcoFlow says it “connects to all microinverters via wall sockets with an AC-coupled solution”
• +Works with no solar at all: charge on a cheap overnight tariff, discharge at peak
• +Off-grid output and faster AC charging than the STREAM AC

Cons

• −No PV input. Buy this thinking it connects to panels and you'll be sending it back
• −An AC-coupled round trip loses more than DC charging on the Pro and Ultra models
• −EcoFlow UK says it's supplied with a stripped-end cable and must be hardwired by an electrician

Pros

• +Same 1.92 kWh capacity as the AC Pro
• +Stores a microinverter's output or cheap overnight units, with no panels connected

Cons

• −EcoFlow's FAQ: “The STREAM AC doesn't support discharging in off-grid mode. It can only work in on-grid mode.”
• −Charging and discharging both top out at 800W
• −No PV input, and out of stock at EcoFlow UK on 8 October 2026