--- title: "Haitai Solar JT705SLkB 705W Solar Panel - Specs & Review | ComparePV" description: "Haitai Solar JT705SLkB 705W solar panel. Specs: 22.70% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/haitai-solar-jt705slkb" updated: 2026-09-11 --- # Haitai Solar JT705SLkB Middle of its segment, modest efficiency 222 panels in the segment HJT 700-750 W ## Identity - **Manufacturer:** Haitai Solar - **Model:** JT705SLkB - **Series:** JT SLk(B) 690-720W - **Rated power:** 705 W - **Cell technology:** HJT - **Bifacial:** yes ## How it compares Compared against segment HJT 700-750 W (222 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 705 W | 715 W | Weak - bottom 22% | | | Module efficiency | 22.70% | 23.02% | Weak - bottom 20% | 3,307 | | Power density | 227.0 | 230.2 | Weak - bottom 22% | 3,361 | | Temperature coefficient | -0.240 | -0.240 | Typical | 13 | | Weight (kg) | 37.3 kg | 38.3 kg | Typical | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 22.70% | 23.02% | Weak - bottom 20% | 3,307 | | Power density | 227.0 | 230.2 | Weak - bottom 22% | 3,361 | | Temperature coefficient | -0.240 | -0.240 | Typical | 13 | | Weight per kWp | 52.9 | 53.6 | Typical | 6,623 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Watch out for - **22.70% module efficiency** - Bottom 20% of the HJT 700-750 W segment, against a median of 23.02%. - **227.0 watts per square metre** - Bottom 22% of the HJT 700-750 W segment, against a median of 230.2. - **Best for:** Commercial and utility-scale. - **Not ideal for:** Tight roof space and roofs where every square metre has to count. ## Specification ### Electrical - **Rated power (Pmax):** 705 W - **Efficiency:** 22.70 % - **Voltage at Pmax (Vmp):** 42.25 V - **Current at Pmax (Imp):** 16.69 A - **Open-circuit voltage (Voc):** 50.15 V - **Short-circuit current (Isc):** 17.49 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.240 %/degC - **Temperature coefficient of Voc:** -0.240 %/degC - **Temperature coefficient of Isc:** 0.040 %/degC - **NOCT:** 43 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** HJT - **Cell count:** 132 - **Bifacial:** yes ### Physical - **Length:** 2384 mm - **Width:** 1303 mm - **Thickness:** 33 mm - **Weight:** 37.3 kg - **Area:** 3.11 m2 - **Power density:** 227.0 Wp/m2 ### Warranty and degradation - **Product warranty:** 15 years - **Performance warranty:** 30 years - **Output guaranteed at end of warranty:** 88.3 % - **First-year degradation:** 1.00 % - **Output after 30 years:** 622 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 3307 of 14005 | | Power density | 3361 of 14005 | | Temperature coefficient | 13 of 14005 | | Weight | 6623 of 14005 | | Warranty | 21 of 14005 | ## Pros - **Temperature Coefficient of -0.24%/°C** - HJT technology delivers a Pmax temperature coefficient of -0.24%/°C, a clear advantage over TOPCon (~-0.31%/°C) and PERC (~-0.35%/°C) modules. In practice, this translates to meaningfully higher energy yield on hot days — the gap versus PERC can reach 2.5–4.5% in annual MWh for installations in warm climates or high-irradiance locations. - **~95% Bifaciality Factor — Higher Than TOPCon** - HJT modules achieve a bifaciality factor of up to ~95%, compared to 80–90% for standard TOPCon modules. The higher bifaciality factor directly increases the contribution of albedo-reflected irradiance, which is especially valuable in ground-mounted systems with light-colored ground cover or gravel. - **30-Year Power Warranty at ≥90.3%** - The manufacturer guarantees power retention of ≥90.3% after 30 years of operation — well above the industry standard for TOPCon and PERC modules, where typical 30-year warranties hover around 87–88%. This makes the series particularly attractive from a long-term project LCOE perspective. - **1500 V System Voltage + IP68 Junction Box** - Support for a 1500 V system voltage enables longer string designs, reducing inverter count and cabling runs — directly lowering BoS and installation costs. The IP68-rated junction box maintains a watertight seal even under prolonged submersion, minimizing failure risk in demanding environments such as ground-mounted farms and large industrial rooftops. - **Bankability — BNEF Tier 1 (Q2 2025)** - Haitai Solar has appeared on the BNEF Tier 1 list since Q2 2025, satisfying the tightened eligibility criteria (minimum 6 projects ≥10 MW financed on a non-recourse basis by 6 different banks per quarter). This status significantly facilitates project finance for C&I and utility-scale PV installations through lending institutions. ## Cons - **HJT Technology Price Premium** - HJT modules are manufactured through a more cost-intensive process than TOPCon, resulting in a higher purchase cost per Wp. In the 690–720 Wp segment, TOPCon-based peer comparables (Renesola RS9, DMEGC DMxxxG12T) at similar efficiencies (23.18–23.2%) are typically available at lower price points, which may negatively impact IRR in capex-sensitive projects. - **Limited BNEF Tier 1 Track Record** - Haitai Solar only achieved Tier 1 status in Q2 2025, meaning its bankability history is considerably shorter than that of segment leaders (JA Solar, LONGi, Trina Solar — continuously Tier 1 for over a decade). For projects subject to rigorous lender due diligence requirements, this may represent a risk factor requiring additional verification. ## About this series The Haitai Solar JT SLk(B) 690-720W series is designed for large-scale installations where maximizing energy output from a given area and stable performance in varying conditions are crucial. The use of **N-type HJT** technology results in very high efficiency and excellent resistance to typical operational issues, such as accelerated power degradation over time. The modules have a **bifacial** design, allowing them to also utilize reflected light from the ground - a significant advantage on bright roofs, gravel, and ground-mounted farms. In practice, the JT SLk(B) series addresses a common dilemma for investors: how to minimize BOS (Balance of System) and installation costs without compromising energy production. The high power output of a single module and the **1500 V system** facilitate the design of longer strings and reduce the number of components in the installation. Another advantage is the **IP68** rating for the junction box, which enhances reliability in harsh conditions. This makes it a good choice for PV farms, C&I (Commercial & Industrial) installations, and projects focused on a quick return on investment. ## Notable figures - At 22.7% efficiency, this panel is on par with typical \*\*HJT 700-750W\*\* modules - At 226.9 W/m², this panel generates 3.2 W/m² less per unit area than \*\*HJT 700-750W\*\* median (230.2 W/m²) - Temperature coefficient of -0.24%/°C matches the \*\*HJT 700-750W\*\* median - Weight of 37.3 kg is typical for \*\*HJT 700-750W\*\* panels - Bifaciality factor of 85% can add 4-13% extra yield with reflective mounting surface ## Questions ### What warranty comes with the Haitai Solar JT SLk(B) 690-720W panels? The JT SLk(B) 690-720W series comes with a 15-year product warranty and a 30-year linear power output warranty. The extended power guarantee is largely enabled by the N-type HJT cell technology, which exhibits a low annual degradation rate compared to conventional PERC modules. ### Do Haitai Solar JT SLk(B) 720W panels perform well in cloudy weather and low temperatures? Yes, N-type HJT technology is well regarded for strong output under diffuse light conditions and low temperatures. The power temperature coefficient is just -0.24%/°C, meaning smaller power losses on hot days compared to older PERC modules. Installations in climates with frequent cloud cover, such as much of Central Europe, benefit noticeably from this characteristic. ### What does bifacial mean in the JT SLk(B) series, and when does it actually boost energy production? Bifacial construction means the module generates electricity from both the front-side direct irradiance and the rear-side albedo light reflected from the ground. Real-world bifacial gains are most significant on high-albedo surfaces such as gravel, concrete, white roofing membranes, or snow-covered ground, where extra yield of 5–15% can be achieved. On dark-colored pitched roofs the bifacial effect is negligible. ### What type of installations is the JT SLk(B) 690-720W series designed for – can it be used on a residential rooftop? The JT SLk(B) series is primarily engineered for large-scale ground-mounted PV farms and commercial and industrial rooftop installations. At up to 720W per module and 1500V system voltage, the panels are optimized for long string design and BoS cost reduction. Residential rooftop use is technically feasible but requires a 1500V-compatible inverter and careful structural assessment due to the module's large format. ### Is the Haitai Solar JT SLk(B) 690-720W compatible with 1500 V systems, and what does that mean for system design? Yes, the JT SLk(B) modules are rated for a maximum system voltage of 1500V DC. This allows designers to configure longer strings with fewer parallel branches, reducing cable runs, BoS component count, and associated labor costs. 1500V inverters are now the commercial standard for utility-scale PV farms and large C&I projects above several hundred kilowatts. ### How long can a Haitai Solar JT SLk(B) 720W panel operate, and how slowly does it lose power over time? HJT technology keeps annual power degradation below approximately 0.4% per year, which is lower than typical PERC modules. The manufacturer backs this with a 30-year performance warranty. Combined with the IP68-rated junction box, the modules are built to maintain reliable output even under harsh environmental conditions throughout their service life. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/hjt-690-720w-b64bf0b68480.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A680-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a680-mde72mw) | 680 W | -25 W, lighter, +2.5 pp | | [AIKO AIKO-A675-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a675-mde72mw) | 675 W | -30 W, lighter, +2.3 pp | | [AIKO AIKO-A700-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a700-mae78dw) | 700 W | Hotter, lighter, +2.3 pp | | [AIKO AIKO-A695-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a695-mae78dw) | 695 W | Hotter, lighter, +2.2 pp | | [AIKO AIKO-G670-MCH72Mw](https://comparepv.com/panel/aiko-aiko-g670-mch72mw) | 670 W | -35 W, lighter, +2.1 pp | | [Longi Solar LR7-72HVHF-670M](https://comparepv.com/panel/longi-lr7-72hvhf-670m) | 670 W | -35 W, lighter, +2.1 pp | | [Jinko Solar JKM650-670N-66QL6-BDV (670W class)](https://comparepv.com/panel/jinko-solar-jkm650-670n-66ql6-bdv-670w-class) | 670 W | -35 W, lighter, +2.1 pp | | [Haitai Solar JT690SLkB](https://comparepv.com/panel/haitai-solar-jt690slkb) | 690 W | -15 W, -0.5 pp | | [Haitai Solar JT695SLkB](https://comparepv.com/panel/haitai-solar-jt695slkb) | 695 W | -10 W, -0.3 pp | | [Haitai Solar JT700SLkB](https://comparepv.com/panel/haitai-solar-jt700slkb) | 700 W | Very close match | | [Haitai Solar JT710SLkB](https://comparepv.com/panel/haitai-solar-jt710slkb) | 710 W | Very close match | | [Haitai Solar JT715SLkB](https://comparepv.com/panel/haitai-solar-jt715slkb) | 715 W | +10 W, +0.3 pp | | [Haitai Solar JT720SLkB](https://comparepv.com/panel/haitai-solar-jt720slkb) | 720 W | +15 W, +0.5 pp | | [AIKO AIKO-A805-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a805-grh78dw) | 805 W | +100 W, heavier, +2.4 pp | | [AIKO AIKO-A800-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a800-grh78dw) | 800 W | +95 W, heavier, +2.2 pp | | [AIKO AIKO-A795-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a795-grh78dw) | 795 W | +90 W, heavier, +2.1 pp | --- Source: https://comparepv.com/panel/haitai-solar-jt705slkb Not in this file, on the page: the I-V and temperature curves lifted from the manufacturer's datasheet, a thirty-year output simulator, a bifacial gain calculator and alternatives filtered by how closely they match these dimensions.