Quote:
Originally Posted by Shrek (russel)
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Can you explain the 0.8 multiplier? If that is depth of discharge 80% is not realistic for any lead acid battery I am aware of. 50% is standard, and 30% is conservative (optimized for battery life/health) for deep cycle lead acid.
If cost is your number one priority I would look into these two options:
1. Lowest Upfront cost, flooded lead acid deep cycle golf cart batteries. 6 of
these Duracell GC2's would give you 645Ah Nominal /
325Ah Usable at 12V and cost
$540 total / $130 cost per usable kilowatt moderately good cycle life (a bit better than AGM, substantially worse than lithium)
2 Cost over time, lithium batteries have a high upfront cost, but will last
substantially longer than lead acid batteries if properly cared for, and have greater depth of discharge (80% is standard) so you get more usable capacity out of a given battery size. There is a steeper learning curve with lithium, and the best value comes from building your own battery bank out of raw cells. Currently
some of the best value on raw cells hover in the
$220-250 range per usable kilowatt including the cost of an entry level BMS. But I want to be clear, building with raw cells, requires learning, and research, and work, and confidence on your part. The cost of 'drop in' lithium batteries is
much higher.
Compared to the
Renogy batteries, 3 x 200Ah Renogy AGM would give you 600Ah Nominal /
300Ah Usable at 12V and cost
$1200 total / $312 per usable kilowatt. One advantage of the AGM is they are 'maintenance free,' with really no learning curve or hassle but they are more costly and have a shorter cycle life than the other two options (much shorter than lithium, marginally shorter than flooded lead acid)