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I've used a few and never had one fail, but it's worth spending the extra few bucks on good solar.
The savings will really come from the lead acid battery lasting longer.
A one amp solar panel on a 40ah flooded battery should never be at risk of over charging it, if it was a plug in trickle changer then you'd want 100/1 ratio, it works because the amps going into the battery dip as it gets full and lead acid can handle it.
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