After paying £7500 less than a year ago to add 2x3.3kwh =6.6kwh growatt batteries to my existing solar panels . I wanted to increase my capacity and have been quoted another 6grand if I want to increase my capacity to 13kw by taking out the 3.3 batteries and putting in 2x6.5kw growatt batteries bearing in mind growatt have stopped making discontinued these batteries
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