Solar Panels vs. Generators – Which Is the Better Backup Solution?

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  • jacksonjones495
    Junior Member
    • Mar 2025
    • 3

    #1

    Solar Panels vs. Generators – Which Is the Better Backup Solution?

    With load shedding affecting homes and businesses, many people are investing in alternative power sources. Some prefer generators for immediate power, while others opt for solar panels and inverters for long-term savings. Which option do you think is more practical and cost-effective?
  • organic farmer
    Solar Fanatic
    • Dec 2013
    • 663

    #2
    What is the most cost effective is to learn to live without electricity.

    I have had an off-grid solar power system for ten years.

    I would say the best way to go into this is to first start with a generator, big enough to power all your household needs. Then add a solar system to that. You will need the generator later while doing maintenance on your battery bank.


    4400w, Midnite Classic 150 charge-controller.

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    • Mike 134
      Solar Fanatic
      • Jan 2022
      • 430

      #3
      For backup? Hands down generator. Most power outages happen due to storms. How many days will it remain cloudy after the storm making your solar panels worthless?
      Just a quick back of envelope calculation, generator is 15% the cost of a solar system with batteries, perhaps even as little as 10%.
      Last edited by Mike 134; 03-27-2025, 07:55 AM.

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      • organic farmer
        Solar Fanatic
        • Dec 2013
        • 663

        #4
        We had a Generac installed last summer, its cost was very near the cost of our solar system [including battery bank].



        4400w, Midnite Classic 150 charge-controller.

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        • DanS26
          Solar Fanatic
          • Dec 2011
          • 987

          #5
          You can buy a 10kW portable generator for as little as $800 (at Tr***** Supply). 10kW is more than enough for critical loads in the average home. Installed with transfer switch for under $1,000.

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          • organic farmer
            Solar Fanatic
            • Dec 2013
            • 663

            #6
            We had a 18kw Generac installed ~$20k.
            4400w, Midnite Classic 150 charge-controller.

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            • DanS26
              Solar Fanatic
              • Dec 2011
              • 987

              #7
              IMO generators are oversold by salesmen. It's really not necessary to run the whole house in an emergency on a generator which basically wastes energy.

              My little 10kW runs a 2 1/2 ton AC, gas furnace, heat pump WH, well pump, microwave, 80% of the lights and outlets. entertainment center and desktop computer center. Plus my wife's workshop with irons and sewing machine. Just set the machine up to run critical loads and you are good to go.

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              • bcroe
                Solar Fanatic
                • Jan 2012
                • 5208

                #8
                Your needs depend on what you consider essential loads.
                Might be
                fridge and freezer
                furnace
                sump pump
                well pump
                communication equip
                Or just cover everything automatically.

                You might just pick up a 5 kva gen set which can run on that
                same fuel you put in the lawn mower. Arrange to be able to
                connect your critical loads to it manually if needed. I have
                one (electric start recommended) that has been used briefly
                4 times since I bought it for half a kilobuck, but not at all in the
                last 2 decades. Needs start battery maintenance.

                You can pay for complete install of an automatic gen plant
                large enough for your entire setup, with automatic transfer
                on power loss. Might be hooked up to natural gas, test run
                automatically on a regular schedule, still needing start
                battery maintenance.

                You could go off grid, which usually implies you will are doing
                your own heating with wood and all that involves. Electrical
                capacity will be limited, most likely will need batteries involving
                inverters and more maintenance. But batteries ultimately
                need a gen set to cover a long loss of renewable power.

                I have enough solar to cover all my heating, cooling, and
                electrical energy needs thru net metering, but no power
                backup. Quite simple, minimal cost, and very low maintenance.
                good luck,
                Bruce Roe

                Comment

                • jacksonjones495
                  Junior Member
                  • Mar 2025
                  • 3

                  #9
                  Thanks y'all for sharing your experiences and advice

                  Comment

                  • DarrinDNelson
                    Junior Member
                    • Mar 2025
                    • 1

                    #10
                    I concur with Mike 134. We started with a natural gas Generac whole house generator for "crisis" backup power. We then added Solar to the house where here in Florida where we have net metering, we essentially are pumping our excess/unused energy back to the grid and getting credit for it. FPL essentially acts as our virtual powerwall. When our solar is not producing electricity, we pull from FPL's grid. If FPL is down, our generator automatically kicks in and serves all of our power needs until FPL comes back on line.

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                    • sdold
                      Moderator
                      • Jun 2014
                      • 1448

                      #11
                      Originally posted by jacksonjones495
                      With load shedding affecting homes and businesses, many people are investing in alternative power sources. Some prefer generators for immediate power, while others opt for solar panels and inverters for long-term savings. Which option do you think is more practical and cost-effective?
                      Originally posted by jacksonjones495
                      With load shedding affecting homes and businesses, many people are investing in alternative power sources. Some prefer generators for immediate power, while others opt for solar panels and inverters for long-term savings. Which option do you think is more practical and cost-effective?
                      Hi, and welcome to the forum. I see that you've joined over 30 other forums in the past week, that's really impressive. With all of those forums you've joined I sure hope you'll find time to stop by here and say hi once in a while.

                      By the way some of your AI posts have some formatting errors, you should go back and check them:

                      image.png

                      Comment

                      • azdave
                        Moderator
                        • Oct 2014
                        • 785

                        #12
                        Originally posted by jacksonjones495
                        With load shedding affecting homes and businesses, many people are investing in alternative power sources. Some prefer generators for immediate power, while others opt for solar panels and inverters for long-term savings. Which option do you think is more practical and cost-effective?
                        This seemed like and AI bot question from the get-go. Why ask about load shedding and using solar panels for backup? The questions are asked in a very odd manner.
                        Dave W. Gilbert AZ
                        6.63kW grid-tie owner

                        Comment

                        • sdold
                          Moderator
                          • Jun 2014
                          • 1448

                          #13
                          The username is what gave it away for me. After a while you notice that they have a lot of similarities, you can see that in the list of recently banned users (within the last two or three years).
                          Last edited by sdold; 03-31-2025, 06:17 PM.

                          Comment

                          • SunEagle
                            Super Moderator
                            • Oct 2012
                            • 15153

                            #14
                            Originally posted by sdold
                            The username is what gave it away for me. After a while you notice that they have a lot of similarities, you can see that in the list of recently banned users (within the last two or three years).
                            So is that post a spam from an AI and should they get banned?

                            Comment

                            • sdold
                              Moderator
                              • Jun 2014
                              • 1448

                              #15
                              It probably is, but I'd wait a bit and see what happens. The worst that will happen is one of the posts will be edited to add a link.

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