Faster solar collection
More collection area for larger systems, RV days and short off-grid cabin trips. Unfolded 2,510 × 982 × 2 mm · folded 620 × 982 × 35 mm · 14.4 kg net.
$499.00
Both panels come off the same 2,510 × 982 × 2 mm sheet, fold to the same 620 × 982 × 35 mm and weigh the same 14.4 kg. The difference is the cell batch: 24% cell efficiency against 25%, which is where the extra 50W comes from without a bigger panel or a heavier case.
| Specification | SP400 | SP450 |
|---|---|---|
| Price | $499 | $599 |
| Price per rated watt | $1.25/W | $1.33/W |
| Rated power | 400W | 450W |
| Cell efficiency | 24% | 25% |
| Dimensions (unfolded) | 2,510 × 982 × 2 mm | 2,510 × 982 × 2 mm |
| Folded size | 620 × 982 × 35 mm | 620 × 982 × 35 mm |
| Net weight | 14.4 kg | 14.4 kg |
Put plainly: +13% rated power for +20% price, and $1.33/W against $1.25/W — about 6% more per watt. The SP450 earns its price when the panel count and the packing space are fixed; the SP400 stays the cheaper route to watts if you have room for another panel.
Panel figures reference STC: 25°C cell temperature, 1,000W/m² irradiance, AM1.5 spectrum. Every row carries a value in both columns — where the two read the same, it is physically the same part on either model.
| Specification | SP400 | SP450 |
|---|---|---|
| Model No. | SP400W | SP450W |
| Rated power (Pmax) | 400W | 450W |
| Maximum power voltage (Vmp) | 36.00V | 36.00V |
| Maximum power current (Imp) | 11.11A | 12.05A |
| Open-circuit voltage (Voc) | 40.32V | 42.02V |
| Short-circuit current (Isc) | 12A | 13.13A |
| Cell type | Monocrystalline | Monocrystalline |
| Cell efficiency | 24% | 25% |
| Surface encapsulation | ETFE lamination | ETFE lamination |
| Fold quantity | 4-fold | 4-fold |
| Dimensions (unfolded) | 2,510 × 982 × 2 mm | 2,510 × 982 × 2 mm |
| Dimensions (folded) | 620 × 982 × 35 mm | 620 × 982 × 35 mm |
| Net weight | 14.4 kg | 14.4 kg |
| Gross weight | 18.4 kg | 18.4 kg |
| Packing size | 107 × 75 × 14 cm | 107 × 75 × 14 cm |
| Connector type | MC4 IP67 connectors | MC4 IP67 connectors |
| Output lead | 1.5m integrated factory-fitted MC4 cable | 1.5m integrated factory-fitted MC4 cable |
| Included adapter cable | DC5521, Anderson, XT60, Aviation M16 | DC5521, Anderson, XT60, Aviation M16 |
| IP rating | IP67 | IP67 |
| Operating temperature | −20°C to 60°C | −20°C to 60°C |
| Optimal temperature | 77°F (25°C) | 77°F (25°C) |
| Test condition (STC) | 25°C, 1,000W/m², AM1.5 | 25°C, 1,000W/m², AM1.5 |
| Warranty | 1 year | 1 year |
Specifications shown are the documented configuration used for this guide. Ratings can vary by market; confirm the exact store listing before purchase.
Both ratings are measured under Standard Test Conditions (STC): 1,000 W/m² irradiance, a 25°C cell temperature and a fixed laboratory sun spectrum. Outdoors, four factors pull the real input down from either label — none of them is a defect, and they cost the same percentage on both panels.
Under good conditions — cool, clear and well-aimed — expect roughly 70–85% of rated watts at midday, which is why the matrix below starts well under the labels. Solar works best as a daylight top-up with an AC recharge plan behind it.
Both panels refill every SoreinPower station — but the meter depends entirely on the light. The matrix shows estimated full-charge time under the four real-world conditions the SP400 is measured in, plus the SP450's clear-midday column, using 85% panel-to-battery efficiency.
| Power station | Battery | SP400 | SP450 | |||
|---|---|---|---|---|---|---|
| Clear midday sun 300–340W | Clear sky · hot panel 235–280W | Thin clouds / low sun 120–200W | Overcast / shade 20–80W | Clear midday 340–385W | ||
| P600 | 481Wh | ≈ 2.4 hours | ≈ 2.4 hours | 2.8–4.7 hours | 7 hours+ | ≈ 2.4 hours |
| P1200 | 1,152Wh | 4.0–4.5 hours | 4.8–5.8 hours | 6.8–11.3 hours | 17 hours+ | 3.6–4.0 hours |
| P2400 | 2,160Wh | 7.5–8.5 hours | 9.1–10.6 hours | 12.7–21.2 hours | 32 hours+ | 6.7–7.6 hours |
| G2400 | 2,400Wh | 8.3–9.4 hours | 10.1–11.8 hours | 14.1–23.5 hours | 35 hours+ | 7.4–8.4 hours |
| G4800 | 4,800Wh | 17–19 hours | 20–24 hours | 28–47 hours | 71 hours+ | 15.1–16.9 hours |
| G7200 | 7,200Wh | 25–28 hours | 30–35 hours | 42–71 hours | 106 hours+ | 22.2–24.9 hours |
| G9600 | 9,600Wh | 33–38 hours | 40–47 hours | 56–94 hours | 141 hours+ | 29.3–33.8 hours |
Only the clear-midday column is shown per panel: the SP450 runs roughly 13% faster in all four conditions, so the hot, thin-cloud and overcast columns scale by the same ratio. "Effectively stalled" means the panel barely covers idle drain, let alone refills the battery. Larger stations simply take proportionally longer at the same light level. The star marks the stations we recommend pairing with these panels.
Series strings add voltage, not current: a string stays at one panel's Imp (11.11A on the SP400, 12.05A on the SP450), so the 20A input limit only bites in parallel. What ends a string is total open-circuit voltage — 40.32V Voc on the SP400 and 42.02V Voc on the SP450 — together with total module watts. Older documentation quoted a 60V ceiling for the main base; the current specification lists 11–100V, and that is what this table uses.
| Panels in series | SP400 total Voc | SP450 total Voc | Total rated power | Verdict |
|---|---|---|---|---|
| 2 | 80.64V | 84.04V | 800W / 900W | Fits |
| 3 | 120.96V | 126.06V | 1,200W / 1,350W | Over 100V and over 1,000W |
| 4 | 161.28V | 168.08V | 1,600W / 1,800W | Over 100V and over 1,000W |
| 5 | 201.60V | 210.10V | 2,000W / 2,250W | Over 100V and over 1,000W |
Two panels in parallel pull 22.22A Imp / 24.00A Isc on the SP400, 24.10A Imp / 26.26A Isc on the SP450, past the 20A main-base input — a parallel array needs its own controller. The P Series ceiling arrives sooner: P600 stops at 50V and P1200 / P2400 at 60V, so two panels is the longest string on any of them. The P1200 also caps solar current at 12A: one panel stays inside it (the SP450's 12.05A Imp only reaches that figure on the STC datasheet, not in real light), but two in parallel do not.
P600 and P1200 take either panel as the main charge; on P2400 and the G Series these panels are a daylight top-up, and the SP450 panel is the faster route.
More room for the weekend
A balanced step up for longer stays and appliances with moderate continuous draw.
Best forHome outages, CPAP backup and mobile work — up to 1,200W
High-output portable
The portable pick for larger appliances and longer off-grid sessions without modular planning.
Best forSmall appliances and power tools — up to 2,400W
Modular high-output starting point
One main base and one battery pack deliver industrial-grade output in the smallest G Series configuration.
Best forConstruction tools and focused backup
Solar panel questions
Straight answers on output, charging, weather, compatibility and care.
About 1,120Wh from the SP400 and 1,260Wh from the SP450 on a typical strong day. The math is rated watts × peak sun hours × 0.7 real-world efficiency, and 4 peak sun hours is what clear weather usually gives you. Either number is a full P1200 refill with room to spare, or a P600 refilled twice over. Winter and overcast stretches cut both further.
In good midday sun expect 300–340W from the SP400 and 340–385W from the SP450. Both labels are Standard Test Conditions ratings measured in a laboratory with 25°C cells. Real output depends on cell temperature, sun angle, shading and system losses — the full explanation sits above this section.
No. Both panels feed a SoreinPower station's built-in MPPT charge controller. A separate controller is only needed when charging a raw 12V battery directly.
Yes. Most SoreinPower stations support pass-through use. Solar refills the battery while the station runs your devices, and the battery buffers the sun's variation either way.
Yes, at reduced input. Thin clouds and low-angle sun deliver 120–200W from the SP400 and 135–225W from the SP450; heavy overcast drops to 20–80W and 20–90W respectively. Either panel still contributes — it just stops being a same-day full-recharge plan for the larger stations.
Both carry an IP67 rating on the panel surface, so rain and splashes are covered. Do not submerge them, and keep connectors and cable ends dry. The folding seams and junction points are the parts to protect. Let the panel dry before folding it away.
Wipe the surface with a soft cloth and fresh water. Dust and pollen alone cut output 5–20%. Store it folded and dry, keep grit out of the folds and never pack sharp objects against the surface. The operating range is −20°C to 60°C.
The P2400 and the G Series accept the full output of either panel, so nothing is capped and the SP450's extra watts actually land. The P600 stops at its 240W MPPT limit, which makes the 220W panel the sensible match there — a 450W panel would be flattened to 240W. The P1200 takes up to 400W, so the SP450 fits but gains little over the SP400.
For pure collection the energy is roughly the same — two 220W panels and one 450W panel harvest comparable watts, and panels wired in series add their voltage. One panel saves mounts, wiring and setup time, while a pair gives you aiming flexibility around obstacles and partial shade. See how the 220W folding solar panel pairs on its own page.
Both panels are the same sheet: unfolded 2,510 × 982 × 2 mm, folded 620 × 982 × 35 mm in a 4-fold layout, 14.4 kg net (18.4 kg gross). The IP67 ETFE surface and monocrystalline cells are built for repeated folding; keep the folds dry and free of grit to protect the hinges.
They are the same panel with different cell batches, so the choice is about how much power you need from a fixed packing space. The SP450 returns 13% more rated power from the identical folded size and costs more per watt — the current gap is in the price table above. Pick the SP450 for a P2400 or any G Series station, where the full output is accepted; pick the SP400 when the station caps the input or when the difference goes unspent.
Yes, and it charges slightly faster — but not by much. The P1200 accepts up to 400W of solar, while the SP450 peaks around 385W in real light, so it sits inside the ceiling rather than above it. Expect roughly 3.5–4.0 hours for a full charge in clear midday sun against 4.0–4.5 hours with the SP400.
