Scott Parsons, the President of Tycon Systems wrote a couple scenarios of how to get electricity when the grid power goes out.
Here's what he wrote:
People would need a system to run a couple LED lights (10W each x 2 = 20W)
a fan (25W)
a small DC refrigerator (60W) or larger AC refrigerator (150W)
and a laptop computer and smartphone (50W)
Total 155W to 245W
Say they have 400Ah of battery.
At 155W load the batteries will last 16hrs (4hrs per 100Ah of battery)
At 245W load the batteries will last 10hrs (2.5hrs per 100Ah of battery)
Our biggest solar system could support the 155W in Puerto Rico. The system has 1000W of solar and 720Ah of battery. RPAL48-180-1000
The maximum this system could support is 180W
To support 245W of load, you would need to add batteries. The 1000W of solar would support it but would need at least 980Ah of battery.
Hope this helps to give some perspective.
I really think the best option for folks is a propane powered generator which could have the capacity to run their whole home. They would need to have enough fuel to supply the power that they would need but propane is safe to store and doesn't get wet like a can of gasoline could. This is just a personal opinion.
When I think of solar and see those with roofs that have been blown off, I think the solar panels would be blown away or damaged. If I was living in an area prone to hurricanes, I would invest in a propane generator and I would build a small block enclosure outside to hold the generator and a couple propane tanks (above expected water levels). I would rewire my house to have a separate circuit that ran only the essential things. I would then install a transfer switch between the generator and those essential circuits. When it was needed I would flip the transfer switch and startup the generator.
My two cents. Hope this helps.
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Sara, Tycon Systems Marketing Department.