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Chart Monthly battery output
System upgraded in April 2018 disconnected for 2 weeks hence very low output that month.
Then much increased output from May 2018 onwards as a result.
April/May 2020 output dropped as most electricity normally for electric car, but car rarely due to lockdown and with very sunny weather very little electricity imported. Sundial output around 50% of monthly import! The Zappi charger installed in July so can run off just export when possible.