Buying Guide · Updated November 2026
DIY Solar Panel Kits 2026: Complete Off-Grid Systems, Sized Right
For most first DIY solar electric systems, the best DIY solar panel kit is a complete kit that ships the panels, charge controller, battery and inverter together, and the ECO-WORTHY 400W 12V Complete Kit is our pick. For a cabin or home backup build, step up to a 48V kit such as ECO-WORTHY’s 1,170W system. Size it from your daily kWh, your sun hours and your battery Wh (the math is below). Whether you can install an off-grid kit yourself is up to your local building department. Anything wired to your house or the grid generally needs a permit, a licensed electrician and, for grid-tied systems, utility approval.
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By Quick Verdict: Which DIY Solar Kit Should You Buy?
First build, RV, van or small cabin: the ECO-WORTHY 400W 12V Complete Kit. It ships every major part, with 2.56 kWh of lithium storage. Cabin or home backup that will grow: the ECO-WORTHY 1,170W 48V kit, then add a second battery. Biggest off-grid kit: the 2,340W 48V kit with a 5.12 kWh rack battery. Already own a battery: Renogy’s 400W panels-only kit. Don’t want to wire anything: a power station plus panels (see the all-in-one section).
| Kit | System | Panels | Battery | Inverter | Our Score | Price |
|---|---|---|---|---|---|---|
| ECO-WORTHY 400W Complete Kit (Battery + 2000W Inverter) Best Complete DIY Kit for Most People |
12V | 4 × 100W = 400W | 2,560 Wh | 2,000W | 82/100 | Check price at Amazon → |
| ECO-WORTHY 1170W 48V Complete Solar Kit (2.56kWh + 3500W Inverter) Best 48V Kit for Cabins and Home Backup |
48V | 6 × 195W = 1,170W | 2,560 Wh | 3,500W | 82/100 | Check price at Amazon → |
| ECO-WORTHY 2340W 48V Complete Solar Kit (5.12kWh + 5000W Inverter) Best Cabin-Scale Kit |
48V | 12 × 195W = 2,340W | 5,120 Wh | 5,000W | 80/100 | Check price at Amazon → |
| ECO-WORTHY 800W 12V Complete Solar Kit (4.02kWh + 2000W Inverter) Most 12V Battery in One Kit |
12V | 4 × 195W = 780W | 4,019 Wh | 2,000W | 71/100 | Check price at Amazon → |
| Renogy 400W Premium Solar Kit (40A MPPT) Best Panels-Only Kit (Bring Your Own Battery) |
12V/24V controller | 4 × 100W = 400W | Not included | Not included | 84/100 | Check price at Amazon → |
Scores use our kit rubric (below) and are editorial ratings synthesized from published specs, listing contents and logged Amazon prices. We did not install or test these kits. Scores for the 1,170W, 2,340W and 800W kits are new this week. Prices update from Amazon; a “Check price” link means no live price was available.
How We Score DIY Solar Kits
These kits are scored on the same six-factor kit rubric as our RV solar kits. The scores are AI-synthesized from manufacturer specs, the Amazon listing contents and the prices we checked on November 12, 2026. We did not install, measure or test any of these kits, and a spec the seller doesn’t publish earns no credit.
- Charge controller and harvest (25%): MPPT vs PWM, plus amp headroom over the panel wattage.
- Value (20%): price per panel watt. This ignores the battery and inverter, so complete kits score lower here than panel-only kits.
- Kit completeness (15%): cables, brackets, fusing and monitoring in the box.
- Panel build (15%): glass and frame, plus published wind and snow load ratings.
- Expandability (15%): room to add panels and batteries, and the system voltage.
- Documentation (10%): spec transparency, and whether listing specs agree with the maker’s own pages.
Power stations such as the Delta Pro 3 are rated on a different six-factor matrix, explained on our methodology page, so compare scores within a category rather than across them.
The 5 Best DIY Solar Panel Kits for 2026
Four complete kits that include a battery and inverter, from a 12V starter to a 48V cabin system, plus one panels-only kit for builders who already own a battery. Every kit was checked for stock on November 12. The two Renogy complete kits we checked (a 200W starter with battery and inverter, and a 400W RV kit with 7.68 kWh) were out of stock or down to a few units on Amazon that day, so neither is listed.
1. Best Complete DIY Kit for Most People
ECO-WORTHY 400W Complete Kit (Battery + 2000W Inverter)
12V system · 4 panels, 400W · 2,560 Wh LiFePO4 · 2,000W inverter · 40A MPPT · Score 82/100
In the box: 4 x 100W bifacial panels, 40A MPPT controller, 2000W pure sine inverter, 2 x 12V 100Ah lithium batteries, Bluetooth module
The simplest way to get a whole 12V system in one order: four 100W bifacial panels, a 40A MPPT charge controller, a 2,000W pure sine inverter, two 12V 100Ah lithium batteries and a Bluetooth module (Amazon listing; ECO-WORTHY’s product images label the batteries 12.8V 100Ah LiFePO4, so storage is 2 × 1,280 Wh). It is the kit already scored in our RV solar kit guide, and it was in stock with ECO-WORTHY holding the buy box on November 12. Read the title carefully: “1.6KWH” is ECO-WORTHY’s claimed daily solar output (400W × 4 hours), not storage. With normal losses, plan on about 1,200 Wh a day.
Pros
- Panels, controller, battery and inverter matched in one box
- 2.56 kWh of LiFePO4 storage runs a fridge, lights and devices overnight
- 12V suits vans, RVs, boats and small cabins
Cons
- 400W of panels takes about two good days to refill both batteries
- 2,000W inverter at 12V means very heavy battery cables
- No fuses, breakers or disconnects are listed in the box
Buy it if: First-time builders powering an RV, van, boat, shed or small cabin with essentials.
Skip it if: You want to run a well pump, power tools and a fridge at once, or plan to grow past about 1 kWh of panels. Start at 48V instead.
2. Best 48V Kit for Cabins and Home Backup
ECO-WORTHY 1170W 48V Complete Solar Kit (2.56kWh + 3500W Inverter)
48V system · 6 panels, 1,170W · 2,560 Wh LiFePO4 · 3,500W inverter · 80A MPPT · Score 82/100
In the box: 6 x 195W N-type bifacial panels, 48V 3500W off-grid inverter with built-in 80A MPPT and WiFi monitoring, 48V 50Ah LiFePO4 battery, solar cables and mounts
A 48V system is where DIY solar starts to look like a small home system. This kit pairs six 195W N-type bifacial panels (1,170W) with a 48V 3,500W inverter that has an 80A MPPT solar charger built in, plus one 48V 50Ah LiFePO4 battery that the listing rates at 2,560 Wh and 58.4 lb. The inverter is the strong part: the Amazon listing gives 7,000W surge, WiFi monitoring and parallel operation of up to six units, and ECO-WORTHY’s own page for its 3,500W 48V all-in-one inverter gives the same 3,500W, 7,000W and 80A figures. The battery is the weak part. The panels can make more energy on a sunny day than one 2.56 kWh battery can hold, so most buyers will want a second battery. The listing warns that the kit ships in several packages.
Pros
- Built-in 80A MPPT has plenty of room for more panels at 48V
- 3,500W continuous, 7,000W surge for pumps and power tools
- One inverter box replaces a separate controller and inverter
Cons
- One 2.56 kWh battery is small for 1,170W of panels
- The inverter’s solar voltage limit isn’t stated on the kit listing; get the manual first
- Ships in multiple boxes that can arrive separately
Buy it if: Off-grid cabins, workshops and backup builds that will grow, and anyone who wants 120V loads with motors.
Skip it if: You need overnight runtime for a household on day one. Budget for more battery, or look at the 2,340W kit.
3. Best Cabin-Scale Kit
ECO-WORTHY 2340W 48V Complete Solar Kit (5.12kWh + 5000W Inverter)
48V system · 12 panels, 2,340W · 5,120 Wh LiFePO4 · 5,000W inverter · Built-in MPPT · Score 80/100
In the box: 12 x 195W N-type panels, 48V 5000W off-grid inverter with built-in MPPT, 51.2V 100Ah Cubix server-rack LiFePO4 battery, cables, brackets
The biggest kit here, and the only one with a server-rack battery. The Amazon listing and ECO-WORTHY’s own kit page both list twelve 195W N-type panels (2,340W), a 48V 5,000W off-grid inverter and a 48V 100Ah server-rack LiFePO4 battery, which is 51.2V nominal and 5.12 kWh. “5KW” in the Amazon title is the inverter, not the battery. Two details differ between ECO-WORTHY’s inverter pages and resellers: whether the output is 120V only or 120/240V split phase, and whether the built-in charger is 80A or 100A. We list neither. If you need 240V for a well pump or dryer, confirm the exact inverter model with the seller before you order. The listing calls the battery a Cubix. ECO-WORTHY’s Cubix100 is covered in our lithium battery for solar storage guide, but the kit listing doesn’t say which revision ships.
Pros
- 2,340W of panels makes about 7 kWh on an average 4-sun-hour day
- 5.12 kWh rack battery; more can be added in parallel
- The listing includes cables and brackets
Cons
- Output type (120V or 120/240V) and charger rating not consistent across sources
- Twelve panels need a real roof or ground-mount plan
- A permanently installed 5 kWh battery almost certainly means a permit
Buy it if: Off-grid cabins and tiny homes, and owners planning a permitted backup system with an electrician.
Skip it if: You rent, can’t mount twelve panels, or want to plug in and go. A power station is the better fit.
4. Most 12V Battery in One Kit
ECO-WORTHY 800W 12V Complete Solar Kit (4.02kWh + 2000W Inverter)
12V system · 4 panels, 780W · 4,019 Wh LiFePO4 · 2,000W inverter · 60A MPPT · Score 71/100
In the box: 4 x 195W N-type bifacial panels, 60A MPPT controller, 2000W pure sine inverter, 12.8V 314Ah lithium battery with Bluetooth, cables
If you want to stay at 12V for an RV or trailer but need more storage than the 400W kit, this one comes with a single 12.8V 314Ah lithium battery, about 4.02 kWh, along with four 195W N-type bifacial panels, a 60A MPPT controller and a 2,000W pure sine inverter. These specs come from the Amazon listing alone. Other ECO-WORTHY 800W 12V kits we found on reseller pages ship a 280Ah battery, so check the label on the battery you receive. Two more details: four 195W panels add up to 780W, not the 800W in the title, and a 60A controller on a 12V battery is already at its limit with 780W of panels.
Pros
- About 4 kWh in one battery: fewer battery-to-battery connections
- Glass panels with aluminum frames and IP68 junction boxes (listing)
- Bluetooth battery monitoring
Cons
- Specs from one source only
- No room on the 60A controller for more panels at 12V
- Sold as 800W, but the panels add up to 780W
Buy it if: Travel trailers and fifth wheels that run a fridge, fans and a microwave off-grid for a few days.
Skip it if: You might expand later. A 48V kit or a 24V build grows more easily.
5. Best Panels-Only Kit (Bring Your Own Battery)
Renogy 400W Premium Solar Kit (40A MPPT)
4 panels, 400W · No battery · No inverter · 40A MPPT · Score 84/100
In the box: 4 x 100W rigid panels, Rover 40A MPPT controller, Bluetooth module, adaptor kit, tray cable, Z-brackets
Not every DIY build needs a kit with a battery. If you already own a battery, or want to choose your own battery and inverter, Renogy’s 400W Premium kit gives you four 100W panels, a Rover 40A MPPT controller, a Bluetooth module, cables and Z-brackets (Amazon listing and renogy.com). It is our top-scored panel kit in the 400 watt solar panel kit guide. Pair it with a 12V battery from our 12V lithium battery picks and an inverter from our power inverter guide. Amazon showed only a few units in stock on November 12.
Pros
- Renogy’s Rover MPPT and app monitoring
- Choose your own battery size and inverter
- Z-brackets, adaptor kit and tray cable included
Cons
- No battery or inverter included
- Little controller headroom for a fifth panel at 12V
- Limited stock when we checked
Buy it if: Builders who already own a battery, or want to buy the battery and inverter separately.
Skip it if: You want every part matched in one order. Choose one of the complete kits above.
Not in any of these boxes: fuses or breakers sized for each circuit, a battery disconnect, battery cable of the right gauge, and a grounding plan. Budget for them, and follow each component’s manual. Smaller builds can start from our 100 watt solar panel kit picks, and bare panels for a custom build are compared in our best 400 watt solar panel guide.
How to Size a DIY Solar Electric System
Size a DIY home solar system from what you use, not from the kit’s headline watts. Four numbers do the job:
- Daily energy (Wh or kWh). For each device, multiply watts by the hours it runs per day, then add them up. Our watts to kWh calculator does the conversion. A fridge cycles on and off, so use its EnergyGuide kWh per year divided by 365, not its nameplate watts.
- Panel watts = daily Wh ÷ (peak sun hours × 0.75). The 0.75 covers heat, dust, sun angle, wiring and charging losses. Most of the continental U.S. gets roughly 3 to 6 peak sun hours a day on an annual average, and fewer in winter (NREL solar resource maps). NREL’s free PVWatts calculator gives month-by-month numbers for your address. Size for your worst month if you are fully off-grid.
- Battery Wh = daily Wh × days without sun ÷ 0.85. The 0.85 covers inverter and battery losses. One day of autonomy is the minimum; two to three days is typical for a cabin you live in.
- Inverter watts. Continuous rating at least the total of everything that can run at once. The surge rating has to cover motor starts (well pumps, fridge compressors, power tools), which can briefly pull several times their running watts. Check the starting watts in the appliance manual, or use our appliance wattage chart.
Worked Example: An Off-Grid Cabin’s Essentials
| Load (example figures) | Watts × Hours | Wh per Day |
|---|---|---|
| Refrigerator | From its EnergyGuide label (example: 438 kWh/yr) | ~1,200 |
| LED lights | 6 × 10W × 5 h | 300 |
| Router and modem | 20W × 24 h | 480 |
| Laptop | 60W × 4 h | 240 |
| TV | 100W × 3 h | 300 |
| Well pump | 1,000W × 0.5 h | 500 |
| Total | 3,020 Wh (about 3 kWh) |
- Panels: 3,020 ÷ (4 sun hours × 0.75) = about 1,000W on an average day. In a 2.5-sun-hour winter month it’s 3,020 ÷ (2.5 × 0.75) = about 1,600W.
- Battery: 3,020 ÷ 0.85 = about 3,550 Wh for one day without sun, or about 7,100 Wh for two.
- Inverter: fridge, pump, TV, laptop, lights and router running together is about 1,400W, plus the pump’s start-up surge. A 3,000W-class inverter gives comfortable headroom.
- Which kit fits: the 2,340W 48V kit covers this cabin with winter margin, and its 5.12 kWh battery carries the load for nearly a day and a half. The 1,170W kit covers average days but falls short in a 2.5-sun-hour winter month, and one 2.56 kWh battery won’t get through a night and a cloudy day. The 400W 12V kit is too small for this load.
For a whole house, the numbers jump. The average U.S. home uses about 28.4 kWh a day (U.S. EIA; state and home-size breakdowns are in our guide to how much electricity a house uses). That works out to roughly 9.5 kW of panels at 4 sun hours and about 33 kWh of battery for a single day. That is why most DIY systems back up essentials rather than a whole home. Our whole-house solar generator cost guide prices the larger tiers, and the solar size calculator runs this math for your own loads.
What Each Kit Makes and Runs
Kit listings quote daily output as panel watts × 4 sun hours, with no losses. Our column applies the 0.75 loss factor, which is closer to what you can plan on. Runtime uses battery Wh × 0.85 ÷ load watts.
| Kit | Panels | Planning Output (4 sun h × 0.75) | Battery | Fridge at 150W Average | 1,000W Load |
|---|---|---|---|---|---|
| ECO-WORTHY 400W Complete Kit (Battery + 2000W Inverter) | 400W | ~1,200 Wh/day | 2,560 Wh | ~15 h | ~2.2 h |
| ECO-WORTHY 1170W 48V Complete Solar Kit (2.56kWh + 3500W Inverter) | 1,170W | ~3,510 Wh/day | 2,560 Wh | ~15 h | ~2.2 h |
| ECO-WORTHY 2340W 48V Complete Solar Kit (5.12kWh + 5000W Inverter) | 2,340W | ~7,020 Wh/day | 5,120 Wh | ~29 h | ~4.4 h |
| ECO-WORTHY 800W 12V Complete Solar Kit (4.02kWh + 2000W Inverter) | 780W | ~2,340 Wh/day | 4,019 Wh | ~23 h | ~3.4 h |
Two patterns stand out. The 12V kits carry more battery than their panels can refill in one day, which suits weekend RV trips where you arrive full. The 48V kits are the other way round: their panels can make more in a sunny day than the included battery holds, so plan on adding battery. For a single big appliance, such as a 1,000W load, the battery and the inverter’s surge rating matter more than the panels.
12V, 24V or 48V: Choosing the System Voltage
Battery voltage sets how much current flows for the same power. Current is watts divided by volts, so a 2,000W inverter pulls about 167A from a 12V battery but only about 42A from a 48V battery, before inverter losses. Higher current means thicker, costlier cable and bigger fuses, and more heat at every connection.
- 12V: matches RV, van and marine wiring and 12V appliances. Practical for small and mid-size systems, and the kits above stop at a 2,000W inverter.
- 24V: a middle step for bigger RVs and boats. Half the current of 12V for the same load. Our solar panel kit guide covers building a 1,000W array on 24V.
- 48V: the usual choice for cabins and home backup. All-in-one 48V inverters combine the charge controller, inverter and battery charger in one box, and 48V server-rack batteries can be added in parallel. Our 48V solar battery guide covers inverter compatibility and UL listings.
Series, Parallel and Voc Limits
Panels wired in series add their voltages, and panels in parallel add their currents. The rule that matters most is open-circuit voltage (Voc). The Voc of a series string must stay under the maximum PV input voltage of the charge controller or inverter. Voc also rises as panels get colder, so a string that is fine on a summer afternoon can exceed the limit on a freezing sunrise. For fixed installations, the National Electrical Code (NFPA 70, Section 690.7) requires calculating maximum PV voltage at the lowest expected temperature. Kit listings rarely give the inverter’s PV voltage limit, so read the manual before planning strings. We don’t publish wiring diagrams. The concepts, with examples for power stations, are in our solar panel setup guide.
What You Can DIY, and What Needs a Permit or Electrician
A lithium battery bank can deliver enough current into a short circuit to melt cable and start a fire, and solar panels make voltage whenever light hits them. This section explains which rules generally apply. It is not legal or electrical advice. Your local building department, called the authority having jurisdiction (AHJ), decides what applies to your property, and states adopt different editions of the National Electrical Code (NFPA’s NEC enforcement map).
| Setup | Rules That Generally Apply | Who Should Do It |
|---|---|---|
| Power station + portable panels, plug-in loads | No building wiring is involved. Follow the manual. | You |
| 12V kit in a van, RV or boat | Not part of your home’s wiring. RV and marine builders follow their own industry standards; for a self-installed kit, fuse and wire to each component’s manual. | You, if you’re comfortable with DC wiring; otherwise an RV or marine electrical tech |
| Off-grid kit fixed to a shed, cabin or ground mount | NEC Article 690 covers the PV wiring, disconnects and overcurrent protection (IAEI, on NEC Article 690). In the 2020 NEC, Article 706 covers permanently installed energy storage over 1 kWh (Mike Holt, 2020 NEC 706.1). Many AHJs require a permit and inspection even with no grid connection. | Ask your AHJ. Some let an owner-occupant pull the permit; others require a licensed electrician. |
| Backup system wired into your home’s panel | The system must connect through a transfer switch or interlock so it can’t backfeed the grid. The 2021 International Residential Code requires residential energy storage to be listed to UL 9540 and restricts where it can go (IAEI Magazine). UL notes that combining individually certified parts in the field doesn’t create a certified system (UL Code Authority). | Licensed electrician, with a permit |
| Grid-tied system (exports to or runs in parallel with the utility) | NEC Article 705 covers power sources that run in parallel with the utility (Mike Holt, 2023 NEC 705.1; EC&M). The utility must approve the interconnection first. PG&E, for example, tells contractors never to turn a system on before it receives permission to operate. | Licensed installer or electrician, with permits and utility approval |
The kits on this page are sold as off-grid systems. Their listings describe off-grid inverters, and none is sold as grid-tie equipment. To back up house circuits with one, plan for an electrician to install the transfer equipment; our transfer switch guide compares the options. If what you really want is solar that offsets your bill with no wiring, see our plug-in solar kits guide. A shed-specific walk-through of disconnects, grounding and NEC 690 questions to ask your inspector is in our shed and garage solar kit guide.
DIY Kit vs Power Station + Panels
A power station puts the battery, inverter, charge controller and protection in one listed box, and you add panels. You give up some cost-per-kWh and repairability. In return there is no battery cable to size, no fuse block to build, and nothing wired into the building unless you add a transfer switch. Two we’ve already rated fit the DIY home-solar use case:
| Product | Battery | AC Output | Solar Input | Weight | Our Score | Price |
|---|---|---|---|---|---|---|
| EcoFlow Delta Pro 3 Whole-home power station; 120/240V output (listing); expandable with extra batteries |
4,096 Wh | 4,000W | 2,600W | 113.5 lb | 95/100 | Check price at Amazon → |
| Bluetti Elite 200 V2 2 kWh power station; Not expandable with extra batteries (Bluetti support) |
2,073.6 Wh | 2,600W | 1,000W | 53.4 lb | 91/100 | $898.99 |
| ECO-WORTHY 2340W 48V Complete Solar Kit (5.12kWh + 5000W Inverter) DIY kit, for comparison; panels included |
5,120 Wh | 5,000W | 2,340W of panels in the box | Battery and panels ship separately | 80/100 (kit rubric) | Check price at Amazon → |
Power stations are scored on our six-factor power-station matrix and kits on the kit rubric, so the scores aren’t directly comparable. Power-station prices don’t include panels.
EcoFlow Delta Pro 3: the whole-home alternative
4,096 Wh, 4,000W, 120/240V output and 2,600W of solar input, expandable with extra batteries (listing). It is the closest thing to a 48V DIY system that needs no battery wiring, and it connects to a home through a transfer switch or EcoFlow’s Smart Home Panel. Our Delta Pro 3 home backup setup guide covers that, and our Delta Pro 3 solar panel guide covers panel strings for its two inputs.
Bluetti Elite 200 V2: the 2 kWh alternative
2,073.6 Wh, 2,600W continuous and 1,000W of solar input in a 53.4 lb unit. It matches the battery size of the 400W 12V kit with no wiring at all. The trade-off is growth: Bluetti says the Elite 200 V2 does not take expansion batteries (Bluetti support). Full details are in our Elite 200 V2 review.
Matched station-and-panel bundles are compared in our solar generator kits guide, and the build-it-yourself versus buy question for house backup is covered in can a solar generator power a house.
Who Should Buy a DIY Solar Kit, and Who Should Skip One
Buy a kit if you…
- Are powering an off-grid cabin, shed, RV, van or boat
- Have a roof or yard spot where panels can stay mounted
- Are comfortable with DC wiring, fusing and manuals, or will hire help
- Want to add batteries and panels over time
Skip it if you…
- Want to cut your bill by feeding the grid (that’s a permitted grid-tie install)
- Rent, or can’t mount panels permanently
- Want outage backup with no wiring (buy a power station)
- Expect to run central AC or electric heat from a kit
DIY Solar Kit FAQ
Can I install a DIY solar panel kit myself?
Many owners install off-grid kits in vans, RVs, boats, sheds and cabins themselves, following the component manuals, but whether that is allowed for a fixed install depends on your local rules. Permanently installed systems on buildings fall under the National Electrical Code (Article 690 for solar, Article 706 for battery storage) wherever it has been adopted, and your local building department decides whether a permit and inspection are needed. Some places let homeowners pull their own electrical permit; others require a licensed electrician. Anything connected to your home wiring or the utility grid needs an electrician and, for grid-tied systems, utility approval.
Do I need a permit for an off-grid solar system?
It depends on where you live and how the system is installed. A portable power station with folding panels involves no building wiring. A permanently mounted array with a battery bank on a shed, cabin or house is building wiring, and many jurisdictions require an electrical permit and inspection for it even when it never connects to the grid. In the 2020 NEC, Article 706 applies to permanently installed energy storage over 1 kWh, and one 12.8V 100Ah battery is already 1.28 kWh. Call your building department before you buy.
How big a DIY solar system do I need to power a house?
Much bigger than most kits. The average U.S. home uses about 28.4 kWh a day (EIA, 2024). At 4 peak sun hours and a 0.75 loss factor, that takes roughly 9.5 kW of panels, and about 33 kWh of battery to cover one day without sun. Most DIY kits are sized for essentials instead: a fridge, lights, internet, a well pump for short runs and some devices, which is often 3 to 5 kWh a day.
Can I connect a DIY solar kit to my home electrical panel or the grid?
Not on your own. To power house circuits during an outage, the system has to connect through a transfer switch or an interlock installed by a licensed electrician, so it cannot backfeed the grid. Sending power to the grid is an interconnected system under NEC Article 705, and the utility must approve it first. PG&E, for example, tells contractors never to turn a system on before it receives permission to operate. The kits on this page are sold as off-grid systems.
Is a DIY solar kit cheaper than a solar generator?
It can be, especially at larger sizes, because separate panels, batteries and inverters often cost less per kWh than an all-in-one power station. But a kit also needs fuses, breakers, wire, mounts and your time, and possibly a permit and an electrician. A power station with portable panels costs more for the same storage but plugs in with no wiring. Compare current prices in the tables on this page.
What does Voc mean, and why does it matter for a DIY kit?
Voc is a panel's open-circuit voltage: the voltage it makes in sunlight with nothing connected. Panels wired in series add their voltages, and panels in parallel add their currents. The total Voc of a series string must stay under the maximum PV input voltage of your charge controller or inverter, and Voc rises in cold weather, so the NEC (Section 690.7) has you calculate maximum voltage at the lowest expected temperature. Use the panel label, the controller manual and the manufacturer's string calculator.
The Bottom Line
Work out your daily kWh first, then size panels for your worst month and the battery for the days without sun. For a first off-grid build, a complete 12V kit is the easiest start. For a cabin or backup system that will grow, start at 48V. Before you mount anything permanently, call your building department, and leave anything that touches house wiring or the grid to a licensed electrician.