SunGold 3kW Off-Grid Solar Kit, 800W Solar, 5.12kWh Battery | 24V | 120V | SGKT-3PRO
Estimated Delivery Between
and .
Order within to get it by the earliest date.
Free Shipping In The USA | Call Us: 877-556-3347
Free Shipping In The USA | Call Us: 877-556-3347
Found A Better Price?
Share it with us now and we will beat it. Get the best deal online, guaranteed!
Estimated Delivery Between
and .
Order within to get it by the earliest date.
Not Sure This Is The Right System?
Request a Free Solar ProposalEvery off-grid system is a trade between what you can run and what you want to spend. This is the floor: the smallest kit we sell that's still a real system rather than a big battery with outlets, built for a hunting cabin, a shed, a van build, or keeping the fridge alive through an outage. 5.12kWh of self-heating LiFePO4 behind a 3,000W all-in-one inverter runs a refrigerator for 28 hours with no sun at all.
120V output only, and 3,000W is surge, not sustained. No 240V appliances: no well pump, central AC, electric dryer, or electric water heater. And the two batteries together supply about 2,560W continuously, so treat the 3,000W rating as headroom for starting loads and plan your steady draw around 2,500W. For 240V or a true 3kW continuous, step up to our 48V kits.

Three common load profiles, with how long this kit carries each one from a full battery and no sun. This is a cabin, shed and backup kit. It isn't sized to run a house, and being honest about that up front saves everyone a return.
| Setup | Continuous draw | Runs for |
| Minimal. LED lighting, Starlink or router, phone and laptop charging. | ~200W | ~21 hours |
| Essential. All of the above plus a refrigerator and a TV. | ~500W | ~8 hours |
| Working. All of the above plus power tools in bursts, or a microwave. | ~1,200W | ~3 hours |
The 800W array produces roughly 3 to 4kWh per day at 4 to 5 peak sun hours. Read that against the 4.3kWh the battery delivers, because the relationship between those two numbers is the whole character of this kit: the panels replace a little less than a full bank per day. It sustains a load of roughly 150W around the clock indefinitely, or heavier use with recovery time in between. It's a refrigerator, lights and devices system.
Estimated runtimes below are from a full charge with no solar input, based on 4.3kWh 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 | ~43 hours |
| Refrigerator | ~150W avg | ~28 hours |
| Cabin essentials | ~250W avg | ~17 hours |
| Lights, electronics, internet | ~300W | ~14 hours |
| Window AC unit | ~900W | ~4 hours |
| Microwave | 1,000W | ~4 hours cumulative |
| Power tools (intermittent) | ~1,200W | ~3 hours |

All-in-one inverter with the controller built in - The SPH302480A combines the inverter, an 80A MPPT charge controller, and an AC charger in one wall-mount unit. Nothing to wire between boxes, which is the main reason this kit installs faster than anything else we sell.
Self-heating cells as standard - Both batteries warm themselves in cold weather so they can accept a charge below freezing. On our larger kits that's a paid upgrade. Here it's the standard cell, which matters for a cabin that sits unheated through winter.
Bluetooth on the batteries - State of charge and cell health from your phone, with no accessory to buy. The inverter itself has no Wi-Fi unless you add the optional module.
Room to roughly triple the array - The controller accepts up to 4,000W at 450VDC, but its 80A limit at 24V means about 2,300W is what it can actually push into the battery. Call it room for two to three times the panels you're starting with. Beyond that, extra solar only earns its keep if you're running loads during the day.
24V, and why that's the right call here - At this size 24V keeps the components small and the wiring forgiving. It's also the reason the range moves to 48V above this kit: past about 3,000W the DC current gets high enough that cable cost and losses start working against you.

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. Ships freight as a single shipment. Liftgate and pallet jack included at no charge, so the driver gets it off the truck and onto the ground at your address. This is the lightest kit in the range: the heaviest single piece is a battery at 45 lbs, and one person can manage most of it. Typical delivery is 5 to 10 business days. 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. This is the most DIY-friendly kit we sell: the all-in-one inverter removes most of the wiring between components, and 24V is more forgiving than a 48V bank. Wire all four panels in a single series string. That puts the array near 174V open circuit, inside the controller's 120 to 400VDC tracking window, where two strings of two would sit at roughly 87V and fall below the window entirely. You still want basic electrical competence and respect for DC current.
This is the entry point to the range. The two kits above it solve two different problems: more reserve, or 240V.
| Kit | What changes | Who it's for |
| This kit. 3kW, 800W solar, 5.12kWh, 24V | All-in-one inverter, self-heating batteries, smallest footprint and lowest price in the range. | Cabins, sheds, vans, and fridge-and-lights backup. |
| SGM-5K5E. 5kW, 1.2kW solar, 5.12kWh, 48V | Same storage, a full 5,000W of continuous output instead of 2,500W, and 50% more array on a 48V bank. | Tiny homes and first builds that need real inverter capacity on 120V. |
| SGM-655M. 6.5kW, 2.22kW solar, 5.12 to 10.24kWh, 120/240V | Adds true split phase, so 240V equipment runs. | Anyone with a well pump, an electric dryer, or 240V shop tools. |
Before you order, it's worth a short call. This is the kit people most often size wrong in both directions, so our sales engineers will check it against your actual loads, confirm the battery covers the hours you need, 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 |
| Batteries | 5 years |
| Solar panels | 25 years |
| Specification | Details |
| Max Continuous Output | 3000W inverter rating |
| Sustained Output from Battery | approx. 2560W |
| Peak Output | 6,000VA |
| AC Output | 120V, 50HZ / 60HZ |
| DC Voltage | 24V |
| Max Solar Input | 4000W |
| Total Watt of Panels | 800W |
| Per Panel Watt | 200 Watt |
| Panel NO. | 4 pcs |
| Total KWH of Batteries | 5.12KWH |
| Usable Energy Delivered to AC Loads | approx. 4.3KWH |
| Chemistry | LiFePO4 Lithium, Self-Heating |
| Battery NO. | 2 pcs |
| Battery Spec | 24V 100AH |
| Specification | Details |
| AC Output | 3000W 24V Solar Inverter |
| Output Waveform | Pure Sine Wave |
| Output Voltage | 120V 50Hz / 60Hz |
| Peak Output | 6,000VA |
| DC Input | 24V, 20 to 33VDC |
| Max PV Input Voltage | 450VDC |
| Maximum PV Array Power | 4000W |
| MPPT Operating Range | 120 to 400VDC |
| Inverter Efficiency | >92% |
| AC Bypass Efficiency | >95% |
| Max Solar Charging Current | 80A |
| Max AC Charging Current | 40A |
| Monitoring | LCD standard, Wi-Fi module optional |
| Dimension | 14.9 X 11.0 X 4.1 inch |
| Weight | 17.6 LB |
| Warranty | 3 Years |
| Specification | Details |
| Nominal Voltage | 25.6V |
| Nominal Capacity | 100AH |
| Energy | 2560WH per unit |
| Voltage Window | 21.6 – 29.2V |
| MAX Continuous Charge Current | 100A |
| MAX Continuous Discharge Current | 50A |
| Peak Discharge Current | 200A ± 3A (10s) |
| Cycle Life | 4,000+ cycles at 80% DOD |
| Main Character | Self Heating / IP65 |
| Monitoring Function | LCD / Bluetooth |
| Dimension | 20.7 X 9.4 X 8.7 inch |
| Weight | 45 LB |
| Warranty | 5 Years |

| Specification | Details |
| Peak Power | 200W |
| Solar Cell | Monocrystalline, 166mm cells |
| Module Efficiency | 20.41% |
| Product Tolerance | ±3% |
| Maximum Power Current (IMP) | 5.53A |
| Maximum Power Voltage (VMP) | 36.16V |
| Short Circuit Current (ISC) | 5.86A |
| Open Circuit Voltage (VOC) | 43.39V |
| Connectors | MC4 compatible |
| Product Dimension | 55.1 X 27.6 X 1.2 inch |
| Product Weight | 23.32 lbs |
| Warranty | 25 Years |
Does this kit include everything I need to install it?
It includes the major system components: the all-in-one inverter, both batteries, all four panels, the DC and PV breakers, the solar extension cable, the 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 battery interconnect cables, rail racking if you're mounting on a shingle roof or the ground (the Z-brackets suit a flat surface or metal roof), conduit, junction boxes, building wire, 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 it really deliver 3,000W?
In short bursts, yes. Continuously, no. Each battery supplies 50A sustained, so the pair delivers roughly 2,560W. The inverter's 3,000W rating and 6,000VA surge cover starting loads like a fridge compressor or a saw, but plan your steady draw around 2,500W.
Can it run 240V appliances?
No. This is a 120V-only system. Well pumps, central AC, electric dryers, and electric water heaters need split-phase power, which starts with our 6.5kW kits.
Will it run a refrigerator through a power cut?
Comfortably. A typical fridge averages around 150W, which is roughly 28 hours on a full bank with no sun at all, and the panels will keep it running indefinitely in reasonable weather.
Do the batteries handle cold?
Yes. Both are self-heating, so they warm themselves to a safe charging temperature in freezing conditions, and they're IP65 rated. That's a paid upgrade on our larger kits and standard here.
How much energy will this generate daily?
The 800W array produces roughly 3 to 4kWh per day at 4 to 5 peak sun hours. Actual output depends on your location, season, panel angle, and shading.
Can I add more panels?
Yes, and it's the upgrade worth making first. The controller's 80A charge limit at 24V means it can put roughly 2,300W into the battery, so two to three times the panels you're starting with is the useful range. Keep any string under nine panels in series so cold-weather voltage stays inside the 450V ceiling.
Can I install this myself?
This is the most DIY-friendly kit we sell. The all-in-one inverter means far less wiring between components, and the kit ships with its own wiring diagram. You still want basic electrical competence, and 24V DC deserves the same respect as any battery system.
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.
Buying solar online should not mean guessing your way through the install. Here’s what you get with Off-Grid Source.
You May Also Like
Trusted By 10,000+ Customers. See All Reviews.
I was a DIY solar power wannabe... that is 'til I connected with Manny... The man's a prince! He not only knows his stuff; he walked me through all things electrical. To make sure I had all I needed... he gave me his cell phone # to text him anytime I got confused... nights and weekends included. The prices were very competitive... definitely go with Manny -- you won't go wrong!
Bruce D.
I am always hesitant to buy things at places I have never shopped... I want to give a shout out to Manny who with great patience and knowledge helped me get my orders... I felt valued as a customer and I will definitely be back in the future. I highly recommend them, they make you feel like family.
Jennene A.
I'm about to go off grid. I called Manny, he walked me through everything so I could truly understand what I needed and never tried to upsell me. He was honest and made a customer for life.
Ray B.
I would personally like to thank Manny... I purchased the inverter and decided I needed to return it... Manny was very understanding and went out of his way to help me return the product and not even have to pay for shipping return. He gives this company reputation, honor and quality customer service!
Roger V.
I have been talking with Manny the owner... He has not only helped me design a system but he's been assisting with the install and components. I am super pleased so far with the assistance.
Jeff S.
We added 2 more batteries to our current set up. Pleased with the customer service from Off-Grid Source! Will be back!
Jason
Very fast response times. Very professional. I highly recommend!
Ray W.
Get Off-Grid Tips, Deals & System Guides, Straight to Your Inbox. Plus, Unlock a Mystery Discount On Your First Order.
Sign up for emails and get exclusive offers, new product drops, and expert advice to help you build the right solar setup with confidence.
Added to your cart:
placeholder