Hi All,

 

Im playing around with the following 

2 x 330W Canadian Solar feeding ------->FM60 charge controller

FM60 feeding --------- > and 4 x 105A batteries in 24v.

 

batteries --------------------> connected to a 1000w pure sine wave inverter

running 2 PC's and a printer.

 

 

All works well but the voltage does drop suddenly when I switch on the laser printer (as expected).

 

I was wondering (and saw on youtube) if it is possible to insert a Supercap after the batteries and before the inverter to deal with / smooth out this sudden voltage drop.

 

Has anybody done something like this, any advice. What type of supercap etc (Ive seen a 16v 700uf for R750 - in picture)

 

Thanks in advance

 

Ive read the supercap threads on the forum and came across this lovely photo :

 

 

 

 

 

1 hour ago, Merlin said:

possible to insert a Supercap after the batteries and before the inverter to deal with / smooth out this sudden voltage drop.

My gut feeling is that it's not going to help much. Whenever there is a large amount of current to be delivered, the cap will likely be the first to provide some of the charge, but as soon as it does the voltage will drop. Now the battery is at a higher voltage than the cap, and the battery will do the bulk of the work. Of course this happens a bit more continuous: Batteries in parallel contribute current according to their individual capacities. Since the battery is far bigger than the capacitor, the battery will do most of the work. The capacitor also has a linear discharge curve, which means it loses voltage far faster than the battery does.

What it might help with is to filter out some of the DC ripple caused by an inverter that's drawing a lot of current.