DELTA Pro 3 High-PV vs Low-PV Solar Inputs Explained: Series Strings and Minimum Panels

The EcoFlow DELTA Pro 3 has two solar inputs. High-PV takes 30-150V, 15A and 1600W, and is made for series strings. Low-PV takes 11-60V, 20A and 1000W, and suits single panels, series pairs and parallel groups. The key rule: High-PV needs at least 30V, so 160W and 220W panels must go in series (2 or more) before it will charge from them.

Volts, amps and why the two ports differ

A solar panel has two numbers that matter here:

• Open-circuit voltage (Voc): the highest voltage it makes, with nothing connected. This must stay under the port’s maximum.
• Operating voltage (Vmp): the voltage while charging. This must be above the port’s minimum.

Wiring panels in series adds their voltages; the current stays the same. Wiring in parallel adds their currents; the voltage stays the same.

High-PV allows up to 150V but only 15A, so it’s built for several panels in series. Low-PV allows only 60V but up to 20A, so it handles one or two panels in series, or several in parallel. In our checks we keep each string’s Voc at least 5% under the port maximum, which means 142.5V on High-PV and 57V on Low-PV.

Minimum and maximum panels per port

Notes on the table:

• One 400W rigid panel on High-PV works at 31V, only 1V above the minimum. Two or three in series give a far more comfortable margin.
• Seven 160W or 220W in series go over the voltage margin (about 149-151V). Stop at six.
• Four 400W in series are 148-157V. Stop at three.
• Six 125W in parallel on Low-PV draw 19.2A, inside 20A, but bifacial gain could push it to 20.4A. Use five if you want headroom.
• Two 160W in parallel on Low-PV need EcoFlow’s Solar Parallel Connection Cable (or T/Y-branch cables, which the DELTA Pro 3 manual also allows).
• 400W Lightweight in series needs a series cable that EcoFlow PH says is sold separately. We couldn’t identify the exact part, so ask EcoFlow PH.
• 125W in series needs the MC4 adapter cables that come only in EcoFlow’s 500W (4 x 125W) set. Parallel uses the panels’ own XT60W leads.
• 60W panel: EcoFlow’s official specs disagree, so we don’t include it here.

Which port should you use?

• Have 3 or more matching panels? Put them in series on High-PV. It takes more watts (1600W) and long strings are what it’s for.
• Have one or two panels? Use Low-PV. A single 220W panel works there; on High-PV it won’t.
• Have both? Use both. The manual allows both inputs at once, and EcoFlow lists 2600W total.

The DELTA Pro 3 manual says the ports have overvoltage protection up to 155V (High-PV) and 62V (Low-PV), but also says to always keep within the normal limits. Treat 150V and 60V as hard limits.

Cables

The manual specifies EcoFlow’s Solar to XT60 Charging cable for High-PV and a Solar to XT60i Charging Cable for Low-PV. The 160W and 220W NextGen panels come with an MC4-to-XT60i cable; EcoFlow doesn’t say whether that fits the High-PV port, so buy the XT60 version for High-PV.

Safety

A six-panel High-PV string runs well over 100V DC. Keep connectors dry and off wet ground. Ground-mounted portable panels are plug-and-play and you can set them up following the manual. Roof mounting or connecting the DELTA Pro 3 to your house wiring needs a licensed electrician and an LGU electrical permit.

What to buy

• EcoFlow DELTA Pro 3 on Lazada (EcoFlow PH) or on Shopee
• For High-PV: 2 to 6 x EcoFlow 220W on Lazada, or 2 packs of 400W Rigid on Lazada
• For Low-PV: EcoFlow 125W Bifacial on Lazada or on Shopee

Check today’s prices. For complete shopping lists and charge times, see the best solar panels for the DELTA Pro 3, our DELTA Pro 3 buyer’s guide and the solar system size calculator.

Bottom line

High-PV wants voltage: two or more 160W/220W panels in series, or one to three 400W panels. Low-PV takes single panels and parallel groups. Use both for the most solar.