Hello,
My system consists of the following:
4 x 320 watt solar panel
SmartShunt 500a
Bluetooth Battery Temperature
SmartSolar mppt 100/50
Multiplus II 24V 3000 GX
4 x 105ah Lead Acid Leisure Batteries
Kohler SDMO 6000A Diesel Generator
Its totally off grid there is no mains electricity.
Now its come to winter the solar is pretty much useless and as soon as I put a half decent load on the batteries the voltage plummets. The generator is set to come on using the assistants with the following settings:
Load Higher Than 1800w for 80 seconds & stop when load lower than 1000w for 60 seconds
DC input is lower than 23v for 10 seconds and stop when DC Input is higher than 28 for 60 seconds
Generator when started must stay on for at least 2400 seconds.
These are the settings I was told to use by the supplier of the multiplus II. So I accidentally left a water heater turned on and when its kicked in last night around 2000watts its dragged the batteries that low that the multiplus crashed and couldn't start the generator and everything went offline until solar kicked in this morning.
Tonight I had about 400watts of lighting switched on and the batteries read 24.4v as soon as i turned the kettle on (its a low voltage one) they dropped to 21v and when I turned it off again (straight away as i didn't want the generator to kick in) they went back up to over 24v.
I did this a few times to pull hard on the batteries then disconnected them and they read 12.5, 12.5, 12.4 & 12.3 (2 batteries are 2 months older there all the same make and model)
If anyone has any advice on what settings I should be using that would be great.