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17-03-2022, 01:45 AM | #8 | ||
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Join Date: Jul 2012
Posts: 2,886
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I have 60kwh of lithium batteries.
Previously i had 100kwh of lead acid. lead acid is absolute rubbish now. You need to never discharge them more than 20% from full, else they crap themselves really quickly. So a 100kwh battery bank is useful for 20kwh. A lithium bank can be discharged almost to zero repeatedly. But...the most important point is the charge rate, lead acid can rarely take more than 10% of its capacity per hour...so it is described as a C10 rate. It means you probably will not have enough hours in a day to recharge a battery bank. My lithium bank has a C1 maximum charge rate...so I can recharge the entire 60kwh in ONE hour of sunshine (if I have enough panels). That is a huge advantage....and lead acid is just a stupid option. As far as batteries in the suburbs the trick is to have a time of use tariff and not have any solar panels at all.... Charge the batteries when power is cheap and run off batteries 100% of the time. In my case peak is 32c/kw and off peak is 12c/kw. Instant reduction in power bills by 65% approx...and immunity from blackouts.
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