Best off-grid solar system packages: how fast each kit's panels refill its battery
Updated 2026-11-09 · Pick: SunGoldPower SGR-8K10E: $4,949 on sungoldpower.com (checked 2026-11-09): https://dealectric.com/go/sungoldpower-sgr-8k10e-off-grid-solar-kit
Short answer. The best complete off grid solar kit for a cabin or small home is the $4,949 SunGoldPower SGR-8K10E: its 3,600 W of panels refill its 10.24 kWh battery in 2.8 peak-sun hours, against 4.6 h for the 6.5 kW SGM-6510M and 9 h for Renogy's 400W kit.
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How this table was made: each figure comes from the maker's own US product page or manual, or from the reviewer named next to it, checked 2026-11-09. Dealectric does not test units itself. Rows with a Buy link are products Dealectric lists: the links are affiliate links, and their codes are re-tested in the brand's own cart every day (last check 2026-11-13).
| Model | Panels | Battery | Inverter output | Peak-sun hours to refill battery | Price per stored kWh | Price | Buy |
|---|---|---|---|---|---|---|---|
| SunGoldPower SGR-8K10E | 3,600 W (8 × 450 W N-type) | 10.24 kWh (2 × SG48100P LiFePO4) | 8,000 W, 120/240 V | 2.8 h | $483 | $4,949 on sungoldpower.com, 2026-11-09 | Buy |
| SunGoldPower SGR-6510E | 3,600 W (8 × 450 W bifacial) | 10.24 kWh (2 × 51.2 V 100 Ah LiFePO4) | 6,500 W, 120/240 V | 2.8 h | $484 | $4,959 (maker, 2026-11-09) | |
| ECO-WORTHY 1560W 48V Complete Off Grid Solar Kit | 1,560 W (8 × 195 W bifacial) | 5.12 kWh (1 × 51.2 V 100 Ah rack battery) | 3,500 W, 120 V only | 3.3 h | $488 | $2,499.99 (maker, 2026-11-09) | |
| SunGoldPower SGR-13KM | 6,300 W (14 × 450 W bifacial) | 20.48 kWh (4 × 51.2 V 100 Ah LiFePO4) | 13,000 W (2 × 6,500 W), 120/240 V | 3.3 h | $483 | $9,891 (maker, 2026-11-09) | |
| ECO-WORTHY 10kW Complete Off-Grid Solar Power System (20.48 kWh, 5,310 W PV) | 5,310 W (590 W panels) | 20.48 kWh LiFePO4 (base version) | 10,000 W, 120/240 V | 3.9 h | $391 (at starting price) | from $7,999.99 (maker, 2026-11-09) | |
| EG4 13kW Complete Off-Grid Kit KIT-E0003 | 7,560 W (27 × 280 W poly) | 20.48 kWh (4 × 5.12 kWh LifePower4) | 13,000 W (2 × 6500EX-48), 120/240 V | 2.7 h | $609 | $12,476.52 (The Home Upgrade, 2026-11-09) | |
| Renogy 400W 12V Complete Solar Panel Kit with 3.6kWh Battery | 400 W | 3.6 kWh, 12 V (AGM or Pro lithium option) | 3,000 W pure sine, 12 V | 9.0 h | $528 | $1,899.99 (maker, 2026-11-09) | |
| SunGoldPower SGM-6510M | 2,220 W (6 × 370 W) | 10.24 kWh (2 × 51.2 V 100 Ah) | 6,500 W, 120/240 V | 4.6 h | $459 | $4,703 (maker, 2026-11-09) |
What the differences mean
- Refill hours = battery Wh ÷ panel W. For the SGR-8K10E that is 10,240 ÷ 3,600 = 2.8 h. For the SGM-6510M it is 10,240 ÷ 2,220 = 4.6 h, and for the Renogy 400W kit 3,600 ÷ 400 = 9.0 h.
- Price per stored kWh = kit price ÷ battery kWh. For the SGR-8K10E that is $4,949 ÷ 10.24 = $483. For the ECO-WORTHY 10kW it is $7,999.99 ÷ 20.48 = $391, and for the EG4 KIT-E0003 $12,476.52 ÷ 20.48 = $609.
- SGR-8K10E vs SGR-6510E: the 8K10E costs $4,959 − $4,949 = $10 less. It has the same eight 450 W panels and the same 10.24 kWh battery, plus 8,000 − 6,500 = 1,500 W more inverter output.
- SGR-13KM vs EG4 KIT-E0003: the same 13,000 W of output and the same 20.48 kWh. The EG4 kit costs $12,476.52 − $9,891 = $2,585.52 more. Its extra 7,560 − 6,300 = 1,260 W of older 280 W poly panels makes it only 3.3 − 2.7 = about 0.6 h faster to refill.
- ECO-WORTHY 1560W vs Renogy 400W: the ECO-WORTHY costs $2,499.99 − $1,899.99 = $600 more. It has 1,560 ÷ 400 = 3.9× the panels and 5.12 ÷ 3.6 = 1.4× the storage, and refills in 3.3 h instead of 9.0 h.
| Use | Package | Why |
|---|---|---|
| Cabin or small home with 240 V loads | SunGoldPower SGR-8K10E | 10.24 kWh refilled in 2.8 h, 8 kW split-phase output |
| Budget weekend cabin, 120 V loads only | ECO-WORTHY 1560W | 5.12 kWh battery included, 3.3 h refill, $2,499.99 |
| Full-time home, about 20 kWh, lowest cost per kWh | ECO-WORTHY 10kW system | $391 per stored kWh, 10 kW 120/240 V |
| Full-time home, about 20 kWh, 13 kW of output | SunGoldPower SGR-13KM | $483 per stored kWh, 3.3 h refill |
| Shed, RV, light weekend use | Renogy 400W 3.6 kWh kit | 12 V, 400 W; needs more than one day of sun to refill |
Peak-sun hours to refill: the figure kit listings leave out
A kit's panels have to refill its battery between one night and the next. Battery watt-hours divided by panel watts gives the hours of full sun (peak-sun hours) the kit needs to go from empty to full. That figure assumes no losses and no daytime load. Real charging takes longer, because heat, wiring and charging losses cut panel output, and anything running during the day uses part of the harvest. A kit whose refill time is longer than the sun hours you actually get in winter can't recover from one cloudy day.
The makers' own sun-hour bases show the gap. SunGoldPower rates the SGR-8K10E at about 14.4 kWh a day from 4 hours of full sun (3,600 W × 4 h), which is more than its 10.24 kWh battery. On the same 4-hour basis the SGM-6510M makes 2,220 W × 4 h = 8.9 kWh, which is less than its own 10.24 kWh battery. Renogy bases its kits on 5–6 peak-sun hours, and at that rate the 400W kit makes 2.0–2.4 kWh a day against a 3.6 kWh battery, so a full refill takes 1.5–1.8 days.
Room to add panels matters as well. The SGR-8K10E's inverter accepts up to 11,000 W of PV on two MPPT inputs, about three times the 3,600 W it ships with, so the refill time can be cut later. The 3,500 W all-in-one inverter in the ECO-WORTHY 1560W kit lists 4,400 W maximum PV input and 145 VDC maximum open-circuit voltage on its own product page, so that kit has much less room to grow. To buy the pick: $4,949: https://dealectric.com/go/sungoldpower-sgr-8k10e-off-grid-solar-kit.
Not recommended
SunGoldPower SGM-6510M ($4,703). It has the same 6.5 kW inverter and 10.24 kWh battery as the SGR-6510E, but only 2,220 W of panels, so it needs 4.6 peak-sun hours to refill. That is more than one day at SunGoldPower's own 4-hour basis. For $4,949 − $4,703 = $246 more, the SGR-8K10E refills in 2.8 h and adds 1,500 W of inverter output.
Sources
- SGR-8K10E price $4,949, 8 × 450 W panels, 8,000 W 120/240 V inverter, 2 × SG48100P 10.24 kWh, 11,000 W PV input, 14.4 kWh/day at 4 h of sun — sungoldpower.com
- SG48100P 51.2 V 100 Ah LiFePO4 battery: 10-year warranty (read 2026-11-09) — sungoldpower.com
- SunGoldPower 450 W N-type panel: 12-year materials and workmanship warranty, 30-year linear performance warranty (read 2026-11-09) — sungoldpower.com
- SunGoldPower returns: 30 days from delivery, original packaging, buyer pays shipping unless damaged, defective or wrong item (read 2026-11-09) — sungoldpower.com
- SGR-6510E price $4,959, 6,500 W inverter, 8 × 450 W bifacial panels, 2 × 100 Ah 51.2 V LiFePO4 — sungoldpower.com
- SGM-6510M price $4,703, 6,500 W inverter, 6 × 370 W panels, 2 × 100 Ah 51.2 V battery — sungoldpower.com
- SGR-13KM price $9,891, 2 × 6,500 W inverters, 14 × 450 W bifacial panels, 4 × 100 Ah 51.2 V LiFePO4 — sungoldpower.com
- ECO-WORTHY 1560W kit price $2,499.99, 8 × 195 W panels, 3,500 W 120 V inverter, one 51.2 V 100 Ah battery — www.eco-worthy.com
- ECO-WORTHY 3500W inverter: 4,400 W max PV input, 145 VDC max PV open-circuit voltage — www.eco-worthy.com
- ECO-WORTHY 10kW system from $7,999.99, 20.48 kWh, 10,000 W 120/240 V, 5,310 W PV of 590 W panels — www.eco-worthy.com
- EG4 KIT-E0003 price $12,476.52, 2 × 6500EX-48, 27 × 280 W poly panels, 4 × 5.12 kWh LifePower4 — thehomeupgrade.com
- Renogy 400W kit with 3.6 kWh battery: price $1,899.99, 3,000 W pure sine inverter, AGM or Pro battery options — www.renogy.com
- Renogy's kit output basis: average of 5–6 peak-sun hours — www.renogy.com
Published 2026-11-09; updated 2026-11-09. The buy links are affiliate links; see the disclosure. Corrections welcome at [email protected] or /feedback.