SunGold Power 8kW Off-Grid Solar Kit, 3.6kW Solar, 16.07kWh Battery | 120/240V | SGR-8K16P
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Not Sure This Is The Right System?
Request a Free Solar ProposalEvery other kit in this range assumes you have somewhere indoors to put the batteries. This one doesn't. The PowerMax 314 is IP65 rated and lives outside, on a wall or a pad, which is the answer when there's no utility room, no dry basement, or no appetite for a few hundred pounds of lithium inside the house. 16.07kWh behind an 8,000W split-phase inverter with 3,600W of bifacial solar: a refrigerator runs for nearly four days on storage alone.
The battery sets the ceiling here, not the inverter. The PowerMax 314 is rated for 7.68kW of continuous discharge, so sustained output lands around 7,000W at the outlet rather than the inverter's full 8,000W. Starting surge is unaffected, and very few off-grid houses pull 7kW continuously. But if yours does, our multi-battery kits are the ones to look at.

Three common load profiles, with how long this kit carries each one from a full battery and no sun.
| Setup | Continuous draw | Runs for |
| Essential. Refrigerator, LED lighting, Starlink or router, phone and laptop charging, a TV. | ~500W | ~27 hours |
| Household. All of the above plus a chest freezer, ceiling fans, a home office, a well pump cycling, microwave and power tool bursts. | ~1,500W | ~9 hours |
| Heavy. All of the above plus central AC or shop equipment running continuously. | ~3,500W | ~3 hours |
The 3.6kW array produces roughly 14 to 18kWh per day at 4 to 5 peak sun hours, and more where the panels pick up reflected light from the back. That's slightly above what the battery delivers in a full discharge, so on a normal day the kit refills the bank with a little generation to spare.
Estimated runtimes below are from a full charge with no solar input, based on 13.7kWh delivered to AC loads. Real numbers depend on your specific appliances and how many run at once.
| Load | Draw | Runtime on battery alone |
| Chest freezer | ~100W avg | ~137 hours |
| Refrigerator | ~150W avg | ~91 hours |
| Cabin essentials | ~250W avg | ~54 hours |
| Lights, electronics, internet | ~300W | ~45 hours |
| Full household (essentials only) | ~800W avg | ~17 hours |
| Window AC unit | ~900W | ~15 hours |
| Microwave | 1,000W | ~13 hours cumulative |
| Power tools (intermittent) | ~1,200W | ~11 hours |
| Well pump (1HP) | ~1,200W running | ~11 hours |
| Central AC (2-ton) | ~3,000W | ~4 hours |
| Electric water heater | ~4,500W | ~3 hours |
Sixteen kilowatt-hours sits between our 10kWh and 20kWh kits, and it's a sensible place to land: essential loads run for days, and the array replaces a full bank in a good day. The bottom rows are capability rather than a daily plan. Heavy 240V loads want to run while the sun is up, and an electric water heater will empty this bank in three hours if you let it.

Storage that lives outside - The PowerMax 314 is IP65 rated with wall and floor mounting, rated to discharge from 14°F. It's the only kit at this size where the battery doesn't take a room off you, and it means the DC run stays short even when the inverter is in an outbuilding.
8,000 cycles at 80% depth of discharge - Unusually, it's quoted with the depth of discharge stated, so it's a number you can actually compare against another manufacturer's. At one cycle a day that's past twenty years.
16,000W of peak for motor starting - Double the inverter's continuous rating, so a well pump can start while other equipment is already running.
UL1973 and UL9540A on the battery, UL1741 on the inverter - Both listed. UL9540A in particular is the fire-propagation test that some jurisdictions now ask for on energy storage, and very little equipment at this price carries it.
Bifacial N-type panels, 22.5% efficient - Dual-glass modules that generate from the back face as well as the front, at up to 80% of front-side output where light reflects onto them. N-type cells also avoid the light-induced degradation that affects conventional P-type panels, and carry a 30 year linear performance warranty rather than the usual 25.
Room for three times the array - Two independent MPPT trackers and 11,000W of PV capacity against the 3,600W included. The kit uses one tracker, so the second is free for a second string.

Every major system component, matched and ready to wire together.
Financing is available through Affirm. Select Affirm at checkout to see monthly payment options before you place the order.
How it ships. Kits ship freight on a pallet, which runs longer than the parcel deliveries in our shipping policy: typically 5 to 10 business days. Liftgate and pallet jack are included at no charge, so the driver gets it off the truck and onto the ground at your address. The battery alone is 271 lbs and arrives on its own pallet: plan for how it gets from your driveway to where it's going before it lands. Eight bifacial panels at 53 lbs each make up the rest, and dual-glass modules are more brittle than standard panels. We send tracking as soon as it leaves the warehouse, and the freight carrier will contact you directly to schedule a delivery window. Someone needs to be there to receive it. Inspect the shipment before you sign. Damaged in transit? We cover it.
Installation. Because this is an off-grid system with no utility interconnection, permitting is often simpler than grid-tied solar. Requirements still vary by location, especially for roof-mounted arrays or permanent electrical work, so check with your local building department before installing. The UL1741 listing on the inverter and UL9540A on the battery are usually the two things they'll want to see, and this kit is unusually well placed on both. You'll want real electrical experience before wiring a 48V battery and 240V circuits.
Wire all eight panels as a single series string on one MPPT tracker. This inverter tracks between 125 and 425VDC. Eight of these panels in series operate near 240V, comfortably inside that window, and draw 15A against the tracker's 22A limit. Splitting them four and four across the two trackers puts each string at about 120V under load, below the tracking floor, so it works erratically and drops out on a hot afternoon when panel voltage sags. Leave the second tracker empty until you add panels: any new string wants at least five of these panels.
These three share the same 8,000W inverter and the same array. The only thing that changes is the battery, and with it where the storage lives and how much of it you get.
| Kit | What changes | Who it's for |
| SGR-8K10E. 8kW, 3.6kW solar, 10.24kWh, 120/240V | Indoor batteries, either two server-rack units or one large wall unit, and a third less storage. Supports the inverter's full 8,000W continuously. | Anyone with indoor space for the batteries, or a house that genuinely draws more than 7kW at once. |
| This kit. 8kW, 3.6kW solar, 16.07kWh outdoor, 120/240V | One IP65 battery that mounts outside, rated for 8,000 cycles at 80% depth of discharge, with UL9540A certification. | Properties with no indoor space to give up, and builds where the storage listing matters for permitting. |
| SGM-8K20. 8kW, 5.4kW solar, 20.48kWh, 120/240V | Half again the array and a quarter more storage, across four indoor batteries. | Full-time off-grid homes that want the largest reserve on this inverter. |
Before you order, it's worth a short call. Our sales engineers will size the kit against your actual loads, check that 7kW of sustained output covers what you plan to run at once, talk through where a 271 lb outdoor battery is actually going to sit, and put together the list of site-specific parts your install will need. Call 877-556-3347.
Warranty claims are handled through Off-Grid Source. Send us photos and order details, and we take it from there.
| Component | Coverage |
| Inverter | 3 years |
| Battery | 10 years |
| Solar panels | 30 year linear performance, 12 year product |
Solar Kit Specification
| Specification | Details |
| Max Continuous Output | 8000W inverter rating |
| Sustained Output from Battery | approx. 7000W at the outlet (7.68kW battery discharge limit) |
| Peak Output | 16,000W |
| AC Output | 120V / 240V split phase |
| DC Voltage | 48V |
| Max Solar Input | 11,000W across two MPPT trackers |
| Total Watt of Panels | 3600W |
| Per Panel Watt | 450 Watt Bifacial N-Type |
| Panel NO. | 8 pcs |
| Total KWH of Batteries | 16.07KWH |
| Usable Energy Delivered to AC Loads | approx. 13.7KWH |
| Chemistry | LiFePO4 Lithium |
| Battery No. | 1 pc, IP65 outdoor rated |
8000 Watt Split Phase Solar Inverter
| Specification | Details |
| AC Output | 8000W with Parallel Function |
| Max Peak Power | 16,000W |
| Output Waveform | Pure Sine Wave |
| Output Voltage | 120/240V (split phase / single phase) |
| MPPT Trackers | 2 independent |
| MPPT Operating Voltage Range | 125 to 425VDC |
| Max PV Open Circuit Voltage | 500VDC |
| Maximum PV Array Power | 11,000W |
| Max PV Input Current | 22A per tracker |
| Efficiency | 92% |
| Parallel Function | Up to 6 units |
| Dimension | 25.6 × 17.7 × 5.1 inch |
| Weight | 53.5 lb |
| Certificates | UL1741 Listed By ETL |
| Warranty | 3 Years |
PowerMax 314 IP65 Outdoor LiFePO4 Battery
| Specification | Details |
| Nominal Voltage | 51.2V |
| Nominal Capacity | 314AH |
| Nominal Energy | 16.07KWH |
| Usable Energy | 15.42KWH |
| Standard Charge / Discharge Current | 150A / 150A |
| Maximum Continuous Discharge Rate | 7.68kW |
| Peak Discharge Current | 220A for 3 seconds |
| Charge Cut-off Voltage | 57.6V |
| Discharge Cut-off Voltage | 44.8V |
| Maximum Depth of Discharge | >96% |
| Cycle Life | 8,000 cycles at 80% DOD, 0.5C, 77°F |
| Charging Temperature | 32°F to 131°F |
| Discharging Temperature | 14°F to 131°F |
| Ingress Protection | IP65, indoor or outdoor |
| Mounting | Wall mount or floor mount |
| Max Parallel Units | 16 pcs |
| Communication | CAN / RS485 / USB / Wi-Fi / Bluetooth |
| Dimension | 41.3 × 18.1 × 10.7 inch |
| Weight | 271 lbs |
| Certificates | UL1973, UL9540A, UN38.3 |
| Warranty | 10 Years |
SGN-450-BDG5 450 Watt Bifacial N-Type Solar Panel
| Specification | Details |
| Peak Power | 450W front side |
| Peak Power with Rear Gain | up to 499W at 13.5% rear irradiance |
| Solar Cell | N-Type Monocrystalline, Bifacial Dual Glass, 96 cells |
| Module Efficiency | 22.5% |
| Bifaciality | 80% ±10% |
| Power Tolerance | 0 to +5W |
| Maximum Power Current (IMP) | 14.97A |
| Maximum Power Voltage (VMP) | 30.08V |
| Short Circuit Current (ISC) | 16.05A |
| Open Circuit Voltage (VOC) | 35.03V |
| Temperature Coefficient of Pmax | -0.29%/K |
| Max System Voltage | 1500VDC |
| Front Glass | 2.0mm with anti-reflective coating |
| Back Glass | 2.0mm heat strengthened |
| Static Load | 5,400Pa front, 2,400Pa rear |
| Junction Box | IP68, 3 diodes, MC4 compatible |
| Product Dimension | 69.4 × 44.7 × 1.4 inch |
| Product Weight | 53.4 lbs |
| Certificates | UL61730 certified by ETL, CEC listed |
| Warranty | 30 Year Linear Performance, 12 Year Product |
Does this kit include everything I need to install it?
It includes the major system components: the inverter, the battery, all eight panels, the DC and PV breakers, solar extension cables, the 1/0 AWG inverter cable, Z-brackets, and the manuals and wiring diagram. What varies is the mounting and building side of the job, and that's site by site. Depending on your site that typically means the pad or structural fixing for the battery, rail racking if you're mounting on a shingle roof or the ground, conduit and outdoor-rated wiring between the battery and the inverter, junction boxes, building wire, a critical loads panel or transfer switch, and labor. Those depend on your structure and your local code, which is why we spec them per site rather than boxing a set that might not fit. Tell us about your install and we'll list exactly what yours needs.
Can the battery really live outside?
Yes. It's IP65 rated, self-heats for charging down to freezing, and discharges from 14°F. Wall and floor mounting are both supported. The inverter is a different matter: it isn't weatherproof and needs to be indoors or in a sheltered enclosure.
Why does it say 7kW sustained when the inverter is 8,000W?
The battery is rated for 7.68kW of continuous discharge, which works out to around 7,000W at the outlet after inverter losses. That's the honest ceiling for sustained load. Starting surge isn't affected, and most off-grid households never draw 7kW continuously, but it's worth knowing before you order rather than after.
How should the panels be wired?
All eight in one series string, on one of the two MPPT trackers. The inverter tracks between 125 and 425VDC and eight of these panels operate near 240V, right in the middle of that window. Four and four across both trackers sits near 120V under load, below the tracking floor, so it works erratically and drops out when panel voltage sags on a hot day. Any string you add later wants at least five of these panels.
How much energy will this generate daily?
The 3.6kW array produces roughly 14 to 18kWh per day at 4 to 5 peak sun hours, and more where the rear face picks up reflected light. Actual output depends on your location, season, panel angle, and shading.
Can I add more battery later?
Yes. The PowerMax 314 supports up to 16 units in parallel, so there's a great deal of headroom. On the solar side the inverter takes 11,000W against the 3,600W included, and the second MPPT tracker is sitting empty for a new string of five or more panels.
What does UL9540A mean?
It's a fire-propagation test standard for energy storage systems. Some jurisdictions now ask for it specifically, particularly for batteries near or inside a dwelling. Along with UL1973 on the battery and UL1741 on the inverter, this kit is better placed for an inspection than most off-grid equipment at this price.
Can I install this myself?
Many customers do. The line worth drawing is where the system meets your building: setting the inverter, running PV, and wiring the battery are within reach for someone with real electrical experience, while tying into an existing house panel is work for a licensed electrician. Moving a 271 lb battery into position is its own job, and worth planning before delivery day.
Shipping is free across the Lower 48. No fuel surcharges, no residential fees, and no liftgate charge on freight orders. The price you see is the price you pay. Read our full Shipping Policy here.
Most orders leave the warehouse in 1 to 2 business days and arrive within 3 to 10 business days. We send tracking the moment it ships.
Anything that ships on a pallet goes freight with liftgate and pallet jack included, so the driver gets it off the truck and onto the ground at your address. The carrier will call you directly to schedule a delivery window.
Returns are 30 days from delivery. For freight deliveries, inspect the shipment before you sign for it. If something is damaged in transit, note it on the delivery receipt and we handle the freight claim, not you. Read more about our Returns Policy here.
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