Hi,
I am new to solar pannel application on inverters, and I am about to use it in a 3.5kVA inverter.
I have no idear of the calculations involved in getting the suitable watt of solar pannels.
I need enough power to charge a 12V 200AH battery together with supply.
One more thing, do I need a PWM before feeding the Inverter?
Hi Georgetwo,
With a 12 volt 3.5KW inverter at the maximum the current from the 12 volt battery/batteries will be around 300 amps. In order to supply this sort of current long term will require a battery bank with a min 1600AH with a heap of batteries in parallel. As far as the pv to charge nothing under 3KW will be enough. I would suggest you have a backup generator to kick in when your single battery goes under 12 volts which will be every time the inverter is used.
I've lived off the grid for over 7 years and our house array is a 2400 watt inverter 12 off 2 volt 600ah sonnenschein batteries in a 24 volt array along with a 1.3 KW pv array. For backup I have a 80 amp forklift style battery charger which runs off a petrol generator. I do expect our battery bank will last another 8-9 years as we do make sure we don't deep discharge them.
For the input current you will need to run that inverter PV alone won't be enough so a wind generator will be a good option and just hope the wind blows enough to charge your battery.
If you want any help please be a bit more specific and I will be happy to guide you.
my battery doesn't last long but the sun is quite high and I dont use more than 200w both day and night .I am not so sure of the watts of pv to apply. Thanks