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Gordo touched on battery sulfation. I learned from a battery engineeer that unless you charge a battery with at least 10% of the amp hour capacity you will not completely flush out the accumulated sulfation. This is a common problem with large banks and modest charging from solar cells.
This is a good justification for a generator set that periodically charges a battery bank at a high amp rate. It flushes out the sulfate and keeps the battery healthy.
HYDRO POWER
Have a look at something called ‘powerspout’ It seems to be a recent entry into the micro generation foeld. looks to be better than the Harris turbbine.