--- title: "Easun Power ISolar-SMX-II-3.6KW vs Growatt SPF 3500 ES - Inverter Comparison | ComparePV" description: "Compare Easun Power ISolar-SMX-II-3.6KW vs Growatt SPF 3500 ES side by side: what actually differs, efficiency, MPP trackers, battery input and the full specification." source: "https://comparepv.com/compare-inverters/easun-power-isolar-smx-ii-3-6kw/growatt-spf-3500-es" updated: 2026-01-19 --- # Easun Power ISolar-SMX-II-3.6KW vs Growatt SPF 3500 ES 11 differences, and they point both ways The largest is max dc voltage: 50 V apart. 5 of 16 comparable parameters are identical, with 16 more left out because at least one datasheet does not publish them. ## The two inverters | Attribute | A | B | | --- | --- | --- | | Inverter | [Easun Power ISolar-SMX-II-3.6KW](https://comparepv.com/inverter/easun-power-isolar-smx-ii-3-6kw) | [Growatt SPF 3500 ES](https://comparepv.com/inverter/growatt-spf-3500-es) | | Manufacturer | Easun Power | Growatt | | Rated AC power | 3.6 kW | 3.5 kW | | Type | Off-grid | Off-grid | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | ISolar-SMX-II-3.6KW | SPF 3500 ES | Difference | | --- | --- | --- | --- | | Max DC voltage | 500 V | 450 V | 50 V apart | | Max efficiency | 92.0 % | 93.0 % | +1.0 pp for SPF 3500 ES | | Rated AC power | 3.60 kW | 3.50 kW | 0.10 kW apart | | Max PV power | 4.00 kW | 4.50 kW | 0.50 kW apart | | Weight | 6.9 kg | 11.5 kg | -4.6 kg for ISolar-SMX-II-3.6KW | | Weight per kW | 1.9 kg/kW | 3.3 kg/kW | -1.4 kg/kW for ISolar-SMX-II-3.6KW | | DC/AC ratio | 1.11 | 1.29 | +0.18 for SPF 3500 ES | | Max AC power | 3.60 kW | 3.50 kW | 0.10 kW apart | | MPPT voltage range | 120-450 V | 120-430 V | 120-450 V vs 120-430 V | | Battery voltage | 20-33 Vdc (rated 24 Vdc; minimum starting voltage 22 V) | 48VDC | 20-33 Vdc (rated 24 Vdc; minimum starting voltage 22 V) vs 48VDC | | Dimensions | 378x280x103 mm | 485x330x135 mm | 378x280x103 mm vs 485x330x135 mm | ## Every compared parameter | Parameter | ISolar-SMX-II-3.6KW | SPF 3500 ES | | --- | --- | --- | | Rated AC power | 3.60 kW | 3.50 kW | | Max AC power | 3.60 kW | 3.50 kW | | Grid connection | Single-phase | Single-phase | | Nominal AC voltage | 230 V | 230 V | | Max AC current | 15.6 A | - | | Max PV power | 4.00 kW | 4.50 kW | | DC/AC ratio | 1.11 | 1.29 | | Max DC voltage | 500 V | 450 V | | MPPT voltage range | 120-450 V | 120-430 V | | Start voltage | 120 V | - | | MPP trackers | 1 | 1 | | Strings per tracker | - | 1 | | Max input current per tracker | 13.0 A | - | | European efficiency | - | - | | Max efficiency | 92.0 % | 93.0 % | | CEC efficiency | - | - | | Battery input | Yes | Yes | | Battery voltage | 20-33 Vdc (rated 24 Vdc; minimum starting voltage 22 V) | 48VDC | | Max charge current | 80 A | - | | Backup power | 3.6 kW | - | | Weight | 6.9 kg | 11.5 kg | | Weight per kW | 1.9 kg/kW | 3.3 kg/kW | | Dimensions | 378x280x103 mm | 485x330x135 mm | | Ingress protection | - | IP20 | | Cooling | forced-air | - | | Noise | 60 dB | - | | Max operating temperature | 55 °C | 55 °C | | Wi-Fi | - | - | | Ethernet | - | - | | Arc fault protection | - | - | | Integrated DC switch | - | - | | Warranty | - | - | ## Related comparisons - [Easun Power ISolar-SMX-II-3.6KW vs Easun Power LSOLAR SML-II-3.6KW](https://comparepv.com/compare-inverters/easun-power-isolar-smx-ii-3-6kw/easun-power-lsolar-sml-ii-3-6kw) - 8 differences, the largest is max input current per tracker - [Easun Power ISolar-SMX-II-3.6KW vs Easun Power ISolar SMV IV 3600-24](https://comparepv.com/compare-inverters/easun-power-isolar-smx-ii-3-6kw/easun-power-isolar-smv-iv-3600-24) - 3 differences, the largest is weight - [Easun Power ISolar-SMX-II-3.6KW vs Easun Power ISolar SMG II 3.6KW](https://comparepv.com/compare-inverters/easun-power-isolar-smx-ii-3-6kw/easun-power-isolar-smg-ii-3-6kw) - 4 differences, the largest is max efficiency - [Growatt SPF 3500 ES vs Easun Power ISolar SMR II 3.5KW](https://comparepv.com/compare-inverters/growatt-spf-3500-es/easun-power-isolar-smr-ii-3-5kw) - 7 differences, the largest is max dc voltage - [Growatt SPF 3500 ES vs Easun Power ISolar MLV 3.5KW-U](https://comparepv.com/compare-inverters/growatt-spf-3500-es/easun-power-isolar-mlv-3-5kw-u) - 5 differences, the largest is weight --- Source: https://comparepv.com/compare-inverters/easun-power-isolar-smx-ii-3-6kw/growatt-spf-3500-es Not in this file, on the page: a written summary generated on request.