NickPowell

there is a small presdure tank but would definitely be a good idea to put a bigger one

would we use these values for bulk and float charging? or where would we set these values?

Not all pumps run at the same time. The borehole pump only comes on when the tanks drop below half. The irrigation pump comes on at 4am in the morning. The house pump runs all the time but its an energy efficient one. The pool pump more likely will be a 1.1KW will be set on timer. I have also installed 9 solar water roof top heaters to heat the pool when its installed so the Heat Pump for the pool will only bridge the gap and not run the whole day. 40KW of battery storage and 24 solar panels generating 8000 to 10 000watts should support the household during the day and the batteries should be fine at night. however I just need to get the settings on the inverter correct. Call back the installer....hes here almost daily LOL and its been more trial and error. Im hoping to get the proper settings without having to estimate and guess. Thanks

Hi Everyone, I have spent time last night reading up and understanding bulk and float charges. As I am using the USE setting with my batteries which are 48V batteries, I have calculated that 57V as a bulk charge will charge batteries to 95% and a float charge of 52V will keep the batteries from discharging below 70% From the discussion I see I might have not cleared what im trying to achieve with my setup. Essentially I am trying to be offgrid but only using the grid charge for emergencies where theres not much sunlight to keep the batteries charged. The idea is that during the day, the solar panels only will charge the batteries to 95%. At night the batteries will work exclusively but must not discharge below 50%. If the batteries go below say 48% then utility must come on if solar is not available to charge the batteries until the sun is available again then utility will switch off and the solar will charge the batteries. BUT the idea is that theres enough capacity between 50% and 95% of the battery to run the house so it never discharges below 50% but if it ever does thats where utility must come on to charge as well. Now that i think the bulk and float charges are set. I still need to set program 20 and program 21 as well as program 60 and 61. Program 20 - Battery stop discharging when grid is available --> 48v (not sure here) So the battery can discharge even if grid is avaiable so ive set this low like 44v Program 21 - Battery stop Charging voltage when grid is available --> 50v but sometimes set to FUL (full). I need to charge only to 95% Solar is to charge the battery even if grid is available. Do I set this low as well or high? Program 60 - Low DC Cut off Voltage on AC output 2 --> 45.5v (not sure here... battery specified is USE so not sure if percentage comes up) What needs to be set here? Low direct current cut off on AC output 2? DC im assuming is DC from solar or DC from Utility?? or both?? What should the cut off be then in that case considering the solar must charge exclusively and only use utility if battery drops below 50% Program 61 - Setting discharge time on AC output 2 --> 30 or ddS - not sure here either Current set on DDS not sure what it shoudl be on Thanks everyone in advance. Kind Regards Nick

well new development since changing those settings. My microwave wont go off ...seems to be working on its own but very slowly...

Yes true. What would the voltage setting be then for 95% and 45%? they are 48v 200ah batteries. Thanks Nick

Thanks have changed it. Would you not change program 20 and 21?! Also maximum combined charge (solar + utility) set to 50A or 60A...

true where do you set inverter charge limits? eg. stop charging when batteries 95% and charge if batteries fall below 45%?

thoughts anyone?

Correct

Please see attached. These are 200ah batteries

Great thanks. Yes 2 inverters but ones faulty...sending for repairs as my troubleshooting and electronics experience does have a cap Thanks any help would be great. We did have it working fine at a point but i must say this was all trial and error and I just thought someone who knows can give me the actual parameters to use.

hi well if 30KW of batteries are overcharging...im assuming 40KW would charge fine Well im pretty much off grid if I can put it that way - borehole and solar. However, I have 3 pumps and the whole house is connected. I plan on installing a large heatpump for a swimming pool im putting in so hence the decision to add another battery...also there will be yet another pump for the pool as well (so 4 pumps...not necessarily all running at the same time) Thats a good point though If I read in between the lines. I could potentially set the timer to stop charging at some point however I was hoping to set this on the inverter so when battery reaches 95% to stop charging and when battery drops to below 45% to charge and if below 40 to charge with Utility as well.

Got clarity from technician. He said there are 5 to 6 panels per string and theres 2 strings per inverter. And theres roughtly 270VDC

hi I think the technician did check this but will double check with him as I did say to get the solar panels to ensure correct and he did test that time.