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I have considered something similar but for my kids ride on toys. They're all 12v so rather than plugging in 3 different chargers i could wire them all in parallel to a solar array. I have (3) panels that i have acquired, each is good for about 8 volts without load and around 1 amp.
A big benefit for you with those panels being such low power is no need for a charge controller. Even a slight discharge on the battery would take quite a bit of time to overcharge it.
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