A solar generator for home backup is a good fit when its output watts cover your biggest load, its watt-hours cover the hours you need, and its panels can refill it between outages. Two Grid Doctor models from My Patriot Supply, 300W and 3,300W, cover small and mid-size plug-in loads. Figures read 2026-11-04.
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Solar generator and power station: the same thing
"Solar generator" is a marketing name. The box holds a battery, an inverter that turns stored direct current into household AC power, and a charge controller that accepts panels. Nothing is burned and nothing spins. The same device is sold as a portable power station, and the page you are reading uses both names. The "solar" part only describes one way to charge it; every unit we cover also charges from a wall outlet.
That distinction matters for choosing. A name tells you nothing about size. What matters is the spec sheet, which is why the broader guide to the best portable power station for home backup starts with watts and watt-hours rather than brands.
Five criteria for choosing
- Output watts. The unit must supply the combined running watts of everything on at once, and its surge rating must clear the start-up spike of motors. Add up your list with the watts to run a house guide.
- Capacity in watt-hours. Hours = Wh x 0.85 / watts, where 0.85 is our planning allowance for conversion losses. A 2,048Wh unit running a 150W load gives about 11.6 hours on paper.
- Solar input. Look at the maximum panel watts and how many panels are included. More input means a faster refill, if the sun cooperates.
- Weight and where it lives. A unit at 57.2 lb stays put; one at 8.625 lb travels.
- Stated limits. Honest sellers say what a unit cannot do. We list those limits next to the strengths.
None of the five is "price", though price per watt-hour is a useful tie-breaker. By our arithmetic the Grid Doctor 3300 is $1.46 per Wh and the Grid Doctor 300 is $1.55, each with one panel included.
Solar recharge math
Panel watts multiplied by sun hours gives the best case. One 200W panel in five hours of good sun is 1,000Wh on paper. Real life loses some to haze, tilt, cable runs and charge-controller losses, so we use 75% as a labelled assumption: about 750Wh. Both numbers are estimates, not seller figures.
| Setup (seller's listing) | Panel watts | Best-case Wh in 5 sun hours | At our 75% assumption |
|---|---|---|---|
| Grid Doctor 3300 with its one included panel | 200W | 1,000 | 750 |
| Grid Doctor 3300 at its stated maximum of five panels | 1,000W | 5,000 | 3,750 |
| Grid Doctor 300 with its one included panel | 100W | 500 | 375 |
| Grid Doctor 300 with a second panel | 200W | 1,000 | 750 |
Read the table against capacity. The 300 stores 320Wh, so a single panel can top it up in one decent day. The 3300 stores 2,048Wh, so a lone 200W panel needs roughly two to three such days to refill it, and that is before you run anything. Extra panels cost money: $447 for another 200W on the 3300 and $247 for another 100W on the 300, as priced by the seller on 2026-11-04.
Where the Grid Doctor models fit
Grid Doctor 3300. My Patriot Supply lists 3,300W continuous, 6,600W surge, 2,048Wh of LiFePO4 storage and a price of $2,997 with one 200W panel. By its page it accepts up to five panels. The seller says it is not ideal where you need 240V for large HVAC or full-home load panels, so think "essential loads on cords": refrigerator, router, lights, a fan, a sump pump if you check the surge. Details are in our Grid Doctor 3300 review.
Grid Doctor 300. The seller lists 300W continuous, 600W surge, 320Wh and $497 with a 100W panel. It is small and light, and it suits a phone, a router, a lamp and a CPAP for a night. The seller says it is not designed for full-size fridges, microwaves, sump pumps, space heaters or HVAC. Read the Grid Doctor 300 review for its runtime table, or the head-to-head comparison.
Specific jobs
- Refrigerator. Food-safety guidance from Ready.gov says a closed fridge holds temperature about 4 hours. A battery can extend that; see the refrigerator runtime math.
- Sleep apnea machine. Read your machine's watts, add the humidifier if you use one, and talk to your clinician about an outage plan. Our CPAP guide has the worked example.
- Compared with a gas generator. A battery has no exhaust. Gas generators belong outdoors, 20 feet from windows, doors and attached garages, according to Ready.gov and the CPSC. See power station vs generator for the trade-offs.
Mistakes to avoid
- Buying on a capacity number alone. A big watt-hour count with a low output rating cannot start a compressor.
- Forgetting the surge. Motors need more power to start than to run.
- Counting on panels you do not own. The price of the included panel is not the price of the recharge speed you want.
- Plugging the unit into a wall outlet to feed the house. Do not plug a power station into a wall outlet to power the house. Use cords from the unit to the devices.
- Treating a marketing feature as a promise. The seller markets an EMP feature on the 3300; we found no independent test of it. Our page on EMP claims explains how to read that kind of line.
- Skipping storage care. The seller advises keeping batteries above 60% charge in storage and topping them up every three months, away from heat above 113 F.
FAQ
What is the best solar generator for home backup?
There is no single best. The 300W unit fits small electronics and a CPAP; the 3,300W unit fits a refrigerator and mid-size plug-in loads. Choose by your watts and hours.
Can a solar generator run a whole house?
Not through a standard plug-in unit. Sizes that matter for a full panel and 240V are beyond what either Grid Doctor model is meant for, according to the seller's own limits.
How many solar panels do I need?
For a unit like the 300, one panel recharges it in a good day on paper. For a 2,048Wh unit, plan on several panels or several days. Use panel watts x sun hours x 0.75.
Can I charge it without sun?
Yes. The seller lists wall charging for both units, 1,800W quick or 600W slow on the 3300 and an 80W adapter on the 300.
Do I need an electrician?
For plug-in use, no wiring is involved, and we give no wiring instructions. Anything that ties into a home panel is a job for a licensed electrician and your utility's rules.
Sources
- My Patriot Supply, Grid Doctor 3300 product page, read 2026-11-04: https://www.mypatriotsupply.com/products/grid-doctor-3300-emp-solar-generator
- My Patriot Supply, Grid Doctor 300 product page, read 2026-11-04: https://www.mypatriotsupply.com/products/solar-generator-300w-by-grid-doctor
- Ready.gov, Power Outages, read 2026-11-04: https://www.ready.gov/power-outages
- U.S. Consumer Product Safety Commission, generators and carbon monoxide, read 2026-11-04: https://www.cpsc.gov/Safety-Education/Safety-Guides/Carbon-Monoxide-Home/Generators-and-Engine-Driven-Tools
Update history
| Date | Change |
|---|---|
| 2026-11-04 | First published |