Thanks Joklyn, The battery size isn't the challenge, and agree this is 100% linked to the hot water, sometimes the system will heat and there will still be charge in the battery, but I get the same behaviour, usually the two lines equal each other. my thoughts are that its a setting some how that the meter is still charging the off-peak power even though it acknowledges its using battery to do so. The solar team are looking at it for me but though potentially others may have had similar challeng ...