The Expandable Solar Power System (Plug and Play)

[Sunking]

No no no no no no. What I'm saying is that the Battery should be kept at 85% or above to make them last.

Makes no difference whatsoever. Battery cost alone wile be 3 to 5 times higher than the mean ole power company will charge you. You just volunteered a 400% or maore increase in electricity silly. You will never have an ROI.

[Maitland Gill]

Right. Now what about the cost of regular replacement?

In your calculations it states "A Battery should not be drained of more than 85% of it's total capacity and 15% of this Battery would be 27.45 Amps." Draining a lead acid battery that far will kill it quite quickly, likely within a year. So where are battery replacement costs figured in? How much, per year, are you allocating for regular battery replacements? You have spec'd out about $6000 worth of batteries, so there needs to be around $6000 a year going to battery replacements.

Or you could go to a more reasonable DOD - say 40%. Now your batteries will last considerably longer, but there will be twice as many. Might save a bit, but you are still going to have to allocate several thousand a year to replace your batteries regularly when they fail.

No no no no no no. What I'm saying is that the Battery should be kept at 85% or above to make them last.

[jflorey2]

Right on the bottom, it says "The total cost for Batteries, Charge Controllers, Solar panels, and other equipment) / $4,453 (365 days)"

Right. Now what about the cost of regular replacement?

In your calculations it states "A Battery should not be drained of more than 85% of it's total capacity and 15% of this Battery would be 27.45 Amps." Draining a lead acid battery that far will kill it quite quickly, likely within a year. So where are battery replacement costs figured in? How much, per year, are you allocating for regular battery replacements? You have spec'd out about $6000 worth of batteries, so there needs to be around $6000 a year going to battery replacements.

Or you could go to a more reasonable DOD - say 40%. Now your batteries will last considerably longer, but there will be twice as many. Might save a bit, but you are still going to have to allocate several thousand a year to replace your batteries regularly when they fail.

[Maitland Gill]

You did not include battery cost in your payback calculations. At your rate you'll be replacing batteries every 2-3 years. What will that do to the breakeven time?

Right on the bottom, it says "The total cost for Batteries, Charge Controllers, Solar panels, and other equipment) / $4,453 (365 days)"

[jflorey2]

My masterpiece is finally complete. Please check for any errors and let me know your thoughts on the subject.

You did not include battery cost in your payback calculations. At your rate you'll be replacing batteries every 2-3 years. What will that do to the breakeven time?

[Maitland Gill]

My masterpiece is finally complete. Please check for any errors and let me know your thoughts on the subject.