BLUETTI’s Apex 300 accepts up to 2,400W of solar input across two XT60 ports, but only in Turbo charging mode. The default Standard mode caps solar at 1,440W, and Silent mode at 500W, according to BLUETTI’s Apex 300 user manual. Each port takes 12–60V open-circuit voltage and up to 20A. Those three numbers, 60V, 20A and the mode setting, decide how many panels you can use and how they need to be wired. This guide covers series and parallel layouts that fit, the app settings that matter, and what solar charging times look like for the 2,764.8Wh battery.
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All Apex 300 figures come from BLUETTI’s Apex 300 User Manual V1.1 for the BLUETTI Apex 300. Panel layouts use BougeRV’s published Arch Pro 200W specs and typical 100W panel numbers, labeled as such. Charging times are our estimates. We haven’t run a logged solar test on this unit yet.
Apex 300 Solar Input Specs
| Spec | BLUETTI Apex 300 |
|---|---|
| Battery | 2,764.8Wh LiFePO4 (51.2V, 54Ah) |
| DC/solar ports | 2 × XT60 |
| Per-port limits | 1,200W max, 12–60V, 20A max |
| Solar input by mode | Standard 1,440W · Turbo 2,400W · Silent 500W |
| AC + solar together | 3,840W max (single unit) |
| Solar cable | Sold separately (MC4 to XT60) |
| Panel compatibility | Third-party panels OK with 12–60V Voc and MC4 connectors; don’t mix panel types |
| Price (BLUETTI, Oct. 17, 2026) | $1,599 |
BLUETTI’s first tip in the manual is the one to remember: never connect panels with an open-circuit voltage above 60V.
Charging Modes and What They Do to Solar
| Mode | AC input | Solar input | AC + solar | BLUETTI’s note |
|---|---|---|---|---|
| Standard (default) | 1,440W | 1,440W | 1,440W | Battery-friendly |
| Turbo | 3,840W | 2,400W | 3,840W | Quick recharge |
| Silent | 500W | 500W | 500W | Quiet, low-power |
Set the mode with the charging mode selector on the unit or in the app. To control it from the app, BLUETTI says to set the selector to “Auto.” If your array can deliver more than 1,440W, switch to Turbo to use it. Otherwise, Standard is gentler on the battery.
The App’s DC Input Setting
In the BLUETTI app, set the DC input source to “PV” (or “Other” in advanced mode). The manual’s PV charging strategy changes with voltage:
| Setting | Input voltage (U) | Max current (I) |
|---|---|---|
| PV, non-advanced | 11–30V | 8.2A |
| PV, non-advanced | 30–60V | 20A |
| PV, advanced | 11–16V | 8.2A |
| PV, advanced | 16–60V | 20A |
This is a big deal for low-voltage arrays. In the default PV setting, a single 12V-class panel or parallel string under 30V is limited to 8.2A, or roughly 150–200W. Wire panels in series to get above 30V, or use advanced mode, to unlock the full 20A.
Why 2,400W Is Hard to Reach in Practice
Each port is rated for 1,200W, but that’s 60V × 20A, and your panels’ Voc must stay under 60V. A panel’s working voltage (Vmp) is usually about 80–85% of its Voc. So a string near the 60V limit runs at around 48–50V. At 20A, that’s about 960–1,000W per port. Across both ports, a well-matched array tops out around 1,900–2,000W in practice, before heat and angle losses. That’s still very fast. Just plan for it rather than expecting a clean 2,400W.
Panel Layouts That Fit
Here we use BougeRV’s Arch Pro 200W specs (31.1V Vmp, 36.4V Voc, 6.7A Isc) and a typical rigid 100W panel (about 18V Vmp, 22V Voc, 5.5A). Check your own panel’s label. Cold mornings raise Voc by roughly 10% or more, so keep that headroom.
| Per port | Wiring | String Voc (cold +10%, est.) | Current | Approx. watts per port (est.) | Fits? |
|---|---|---|---|---|---|
| 1 × 200W Arch Pro | Single | 36.4V (~40V) | 6.7A | ~200W | Yes |
| 2 × 200W Arch Pro | Series | 72.8V (~80V) | 6.7A | n/a | No, over 60V |
| 2 × 200W Arch Pro | Parallel | 36.4V (~40V) | 13.4A | ~400W | Yes |
| 2 × 100W typical | Series | 44V (~48V) | 5.5A | ~200W | Yes |
| 4 × 100W typical | 2S2P | 44V (~48V) | 11A | ~400W | Yes |
| 6 × 100W typical | 2S3P | 44V (~48V) | 16.5A | ~600W | Yes |
| 2 × 100W typical | Parallel | 22V | 11A | ~150W in non-advanced PV (8.2A cap under 30V) | Yes, but slow |
Use the same layout on the second port to double it. For example, two Arch Pro 200W panels in parallel on each port is four panels, or 800W of rated panel, delivering around 600W in good sun by our estimate. A third panel in parallel would push the string’s short-circuit current just past 20A (3 × 6.7A = 20.1A), so it’s better to stop at two per port with this panel. For more, a higher-voltage panel (around 40V Voc) in a two-panel series string gets each port closer to its practical ceiling.
Our solar panel specs explainer shows how to read Voc, Vmp and Isc on a label, and our bifacial vs monofacial guide covers panel choice.
Worked Example: Solar Charging Time
The Apex 300 holds 2,764.8Wh. Going from 20% to 100% means adding about 2,212Wh. Real-world panel output is usually 70–80% of the label rating in good sun, so these estimates use 75%.
| Array (rated) | Est. real output | 20–100% time (est.) | Mode needed |
|---|---|---|---|
| 400W | ~300W | ~7.4 hours of strong sun | Standard or Silent |
| 800W | ~600W | ~3.7 hours | Standard |
| 1,200W | ~900W | ~2.5 hours | Standard |
| 2,000W+ (both ports near max) | ~1,500W–1,900W | ~1.2–1.5 hours | Turbo |
A typical day has about 4–5 peak sun hours, so an 800W array refills most of the battery in one sunny day. BLUETTI notes the battery management system may reduce charging power based on battery temperature and state of charge, so the last few percent take longer.
Solar Plus Grid: The App’s Work Modes
The manual describes modes that decide how solar and grid power are shared:
- Standard: charges from available solar and grid power, with priority on solar.
- Time Control: charges during off-peak hours and runs devices during peak hours, with solar helping during the day.
- PV Priority: charges from the grid up to a set state of charge, then switches to solar for the rest.
For home backup, PV Priority keeps a reserve topped up by the grid while solar covers daily use. Our BLUETTI Apex 300 review covers the AC side, expansion batteries and runtime math.
Setup Steps
- Lay out the panels in full sun, angled toward the sun, and wire them in series, parallel or series-parallel as planned. Use MC4 branch connectors for parallel strings.
- Measure the string’s Voc with a multimeter before connecting. It must read under 60V. Our multimeter guide shows how.
- Connect each string to the Apex 300 with an MC4-to-XT60 solar charging cable.
- In the app, set the DC input source to PV, and pick advanced mode if you’re running a low-voltage array.
- Choose Standard or Turbo based on your array size.
- Watch the DC input power on the screen. The manual says the display shows when it’s charging from solar, cars or lead-acid batteries.
Error Codes to Know
- E033, PV overvoltage: the input is outside 12–60V. Rewire with fewer panels in series.
- E039, PV overtemperature: let it cool, then re-enable the PV input.
Cable and Connector Tips
- Use the right adapter. The Apex 300’s DC inputs are XT60, so you’ll need MC4-to-XT60 cables, one per port, sold separately.
- Keep extension runs thick. At 15–20A, thin extension cables waste power as heat. Use 10AWG for longer runs between the array and the unit.
- Match the panels. BLUETTI says not to mix panel types. In a series string, mismatched current drags the whole string down to the weakest panel.
- Check the polarity. Confirm the polarity at the XT60 end with a meter before plugging in, especially with branch connectors.
- Mind the shade. In a series string, shade on one panel cuts output for the whole string. Parallel wiring is more forgiving when trees or a roof rack cast shadows.
FAQ
What is the BLUETTI Apex 300’s max solar input?
2,400W in Turbo mode across two XT60 ports, 1,200W per port, 12–60V and 20A each. Standard mode caps solar at 1,440W.
Can I use third-party solar panels?
Yes. BLUETTI says any panels with 12–60V Voc and MC4 connectors work, but don’t mix panel types.
Can I put two 200W panels in series?
Only if their combined Voc stays under 60V. Two BougeRV Arch Pro 200W panels (36.4V Voc each) total 72.8V, which is too high, so wire them in parallel.
Why is my solar input stuck around 150–200W?
In the non-advanced PV setting, inputs under 30V are limited to 8.2A. Wire panels in series to get above 30V, or switch to advanced mode.
Does it charge from solar and AC at the same time?
Yes, up to 3,840W combined on a single unit in Turbo mode.
Can I charge it from the car?
Yes, at up to 96W from a 12V socket or 192W from 24V. BLUETTI’s Charger 1 is the faster option. Our Charger 1 setup guide explains it.
Bottom Line
To get the most solar into an Apex 300, keep every string under 60V Voc and 20A, use both ports, and match the mode to the array: Standard up to 1,440W, Turbo above it. Wiring in series above 30V avoids the low-voltage current cap. A well-built 800–1,200W array refills most of the battery in a single sunny day.