Yep i already do this - based on a few variables - you do not need a PID loop but do need the following (where are you by the way ?)
IN my case i have a whole of house energy monitor so i can measure the following
Consumption (of the house)
Solar output
Grid draw or feed
Battery Charge/Discharge
In my case my POCO in Australia provides a variable rate for the supply of electricity (it changes every 1/2 hour) - between certain hours we are charged to feed into the grid - but generally on a reasonable weather day we can be assured of low power rates between 10am - 3PM
Here is my code below - feel free to ask any questions
First block is the exported part of the flow which may be a bit overwhelming
2nd part is just the Function node that does the heavy lifting
Note the following
I have 3 battereis with a total capacity of 39.9Kwh
They have their own BMS so i do not have to worry about overcharging etc - once they hit 90% charge they taper down the acceptable charge rate
Our POCO charges us a lot extra for power used after 3PM so the goal is to have the batteries fully chargeg by then and then put them into auto mode so they service the house needs and keep the draw from the grid to Zero.
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Date();\nThreePMDay.setHours(15);\nThreePMDay.setMinutes(0);\nThreePMDay.setSeconds(0);\n\n//In case it spans a day - code to be safe\nif (d > ThreePMDay) {\n ThreePMDay.setDate(ThreePMDay.getDate() + 1)\n};\n\n//Get the difference between current time and 3PM\nvar diff = ((ThreePMDay.getTime() - d.getTime()) / 1000) / 60; // Return the value in minutes\nnode.warn(\"Difference till 3PM \" + (diff));\n\n//Round this into Hours to 2 decimal places\n\nif (diff > 30) {\nRemainingTimeToCharge = (diff - 30).round(2);// Set an offset to account for battery slow charge at top SOC - take 1/2 hour off the time calculated\n}\nelse RemainingTimeToCharge = diff;\n\n\nnode.warn(RemainingTimeToCharge);\n\nmsg.RemainingTimeToCharge = RemainingTimeToCharge;\n\n\nAmountToCharge = (100 - AverageSOC) / 100 * 39900; //Set how much we need from the Grid - essentially in Kw\nnode.warn(\"This is the amount to charge with no offset \" + AmountToCharge);\n\n\nSetChargeRate = ((AmountToCharge / 3) / RemainingTimeToCharge) * 60; //Work out the charge rate per inverter\nnode.warn(\"Set Charge Rate \" + SetChargeRate + \" Amount to Charge \" + AmountToCharge + \" Remaining Time to Charge \" + RemainingTimeToCharge);\n\nSetChargeRate = SetChargeRate.round(2);\nSetChargeRatePerInverter = (SetChargeRate / 50) + 6; //Convert this into %Value and add 6 to ensure we are full at the end \nSetChargeRatePerInverter = SetChargeRatePerInverter.round(0);\nnode.warn(\"Set Charge Rate \" + SetChargeRate);\nnode.warn(\"Set Charge Rate Per Inverter \" + SetChargeRatePerInverter);\n\n\n//At the end of the charge cycle - do not stop charging too early or we will end up running over 3PM\n//This is crude and could really key in better on the Extended Battery info such as Max Charge rate and \n\n//Slowdown charging in first 1 hours to maximize use of solar\nif ((diff > 180 && Weather.match(/Sunny./i)) || (diff > 180 && (ManualChargeRamp == \"Manual\"))) {\n SetChargeRate = SetChargeRate * 0.60;\n 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