Attached are 2 pictures, both are with no shore power. One is with the solar power turned off and the fridge turned on being powered by the house bank (via the Multiplus inverter). The second is with the solar on powering the fridge and the excess going to the house bank. My question is why does the house bank show a positive watt number when its powering the fridge and a negitive number when its getting the excess charge from the solar?