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Old 09-23-12, 08:58 PM   #8
Master EcoRenovator
Join Date: Mar 2009
Location: Western Wisconsin.
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My parents sized their battery bank to only be discharged to 20% DOD and are planing for it to last 20+ years, 14 years in and everything seems good so far, every once in a while they drop down to 30% or even 40%, so at 40% they used twice what they planed... if you plan to discharge to 50% you don't have that wiggle room for a bad week of no sun or wind and no back ups, like after an ice storm where you can't get the generator fired up, power lines to their grid tied system are down, blades on the wind turbine are iced up and it's not sunny to melt the ice of anything, at that point it's nice to have the fan on the furnace work to keep the house warm.
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