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.

hi there, so the batteries and brand is GSO but if you look at the Axpert and Mercer, Infini etc all look like almost identical to this. QR Code scan on side of inverter says Voltronic Power. I actually opened the one thats faulty to try and repair and also noted the Axpert / voltronic boards. I think we did battle quite a bit using the preset battery types Li B, Li C, I think they did try PYL but cant recall - guys were fiddling for a while. Eventually got USE to work. They made up their own BMS data cable so currently connected from BMS to RS485. It is beeping currently as I think it looses comms or settings are off again as i adjusted when the batteries were getting overcharged. We couldnt get the wifi app to work as yet. I know each battery is connected in series as 1 is connected to the other, to the other, then one is made as Host and connected to BMS. Charging not evenly I would say so not sure if BMS is working as it should. This morning it was on 78% host battery, 2nd battery 81% and 3rd battery 82% So not sure to be honest.

Hi Everyone I trust you are all well. I have 2 x 6KW Hybrid Inverters (Single Phase). I am finding it challenging to get the most accurate parameters to set on the inverter. Its been and back and forth/trial and error type situation between the installer and myself. The common faluts that have been happening is either the inverter over charges or doesnt stop charging the solar batteries (on Only Solar OSO) or when Solar and Utility are set to charge the batteries it also overcharges. Im not mentioning the brand of my inverter purely because its pretty much an Axpert type inverter (they all have voltronic hardware - Axpert, Kodac, Mercer, Infini, etc etc). Its the one with the round screen. So in order to assist me, let me detail my current setup: I have 24 x 445W Longi Solar Panels connected in 2 pairs of 12. I have 3 x 10KW Solar Lithium Batteries 48v (200ah) soon to add a 4th 10kw. 1 Have 2 x 6KW Hybrid Solar Inverters (one is currently faulty so sending off for repairs), so only running 1 inverter with 12 solar panels until the one returns and works. Current Settings are: Program 00 - ESC (not relevant) Program 01 - Output Source Priority selection --> SBU (Solar to provide power as 1st priority, battery 2nd or together with solar, and Utility to power to loads if battery voltage drops to low level ) Program 02 - AC Input Voltage range --> APL (range between 90 - 280VAC). I have changed between APL and UPS as the standard socket is 220v. But not sure if it makes a difference? Program 03 - Output Voltage -->230 (i have on my own set to 220v but technician sets back to 230v) Not sure why 230 if sockets use 220 but i think the Utitilty current fluctuates between 220 and 233. Program 04 - Output Frequency --> 50Hz Program 05 - Solar Supply Priority --> LBU (solar provides power to loads as first priority) Program 06 - Overload Bypass, when enabled unit will transfer to line mode if overload occurs in battery mode. --> BYD (disabled) Im assuming because we dont grid feed - or should this be enabled? Program 07 - Auto restart when overload occurs - Disabled (technician says dont want to keep restarting everytime) Program 08 - Auto restart when over temperature occurs - Disabled (same reasonong as 07) Program 09 - Solar energy feed to grid config - Disabled (have digital prepaid and no grid feed avail in my area) Program 10 - Charger source priority - I have on OSO (only solar) but have used SNU (solar and utility to charge) if batteries go below 30%... however i prefer OSO Program 11 - Maximum Charging current (to configure total charging current for solar and utility chargers - max utility + solar charging current). --> 60A (not sure if this is right) Program 12 - not avaliable Program 13 - Maximum Utility charging Current -->30A I would assume 30A +30A from solar to charge if battery goes below a certain level and utility and solar are charging together. But generally this will only be solar charging so Utility shouldnt come on much Program 14 - Battery Type --> USE (user defined) Program 15 - not available Program 16 - not available Program 17 - Bulk charging voltage (CV Voltage) -->53.8 (im not sure what bulk charging voltage for 3 x 10KW 48v Lithium batteries in series) Program 18 - Floating charging voltage --> 49.5 (not sure what float charge for 3 lithium batteries. I dont want the batteries to charge to 100% only 95%)... so no sure here as well Program 19 - Low DC cut off battery voltage setting -->46 or 44v (technician has been changing this) Program 20 - Battery stop discharging when grid is available --> 48v (not sure here) Program 21 - Battery stop Charging voltage when grid is available --> 50v but sometimes set to FUL (full). I need to charge only to 95% Program 22 -Auto return to default screen --> stay on latest screen (technician set) Program 23 - Backlight control --> on Program 24 - Alarm Control --> on Program 25 - Beeps when primary source interupted --> on Program 27 - Record Fault Code --> disabled? Program 28 - AC output mode --> PAL as we had the other inverter running. Technician said it doesnt make a difference on 1 inverter as it wont find another Program 29 - Rest PV Energy Storage --> not reset? not sure what to set here Program 30 - Start charging time for AC Charger --> SEA00.0 Program 31 - Stop charging time for AC Charger --> SE000.0 Program 32 - Scheduled time for AC output on --> 0N00.00 Program 33 - Scheduled time for AC output off --> 0FF00.00 Program 34 - Set country customised regulations --> Ind - using India setting for South Africa? Program 35 to 42 - not available Program 43 - Lithium Battery turn on when device powered - Disabled Program 44 - Lithium Battery turn on immediately --> Disabled Program 45 - 59 - not avaliable 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) Program 61 - Setting discharge time on AC output 2 --> 30 or ddS - not sure here either Program 62 - Scheduled time for AC output 2 on --> ON Program 63 - Scheule time for AC output 2 off --> OFF Program 64 - 94 - not availale Program 95 - 99 - time settings not really relevant I would appreciate any help one can provide to get the most accurate correct settings. Kind Regards Nick