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A question on grid usage with SBU or SUB

shumbaman
in Solar Power

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SBU/SBU is  a good option to maximise the use of the available solar. However when solar is not available (particularly at night) are you better off switching to grid or to battery? Using batteries will obviously deplete them but if you have enough PV power they should recharge during the day and if you have enough battery storage you can see out the night and wait for the solar to start the recharging again in the morning. It all boils down to the economics and the savings derived from less grid usage compared to the the fact that by cycling the batteries they will not last as long. Anyone got some experience or ideas on this? 

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