I have a Multiplus compact 12/2000/80-50 that came in a campervan i have purchased. I need more power, so was wanting to upgrade the batteries(done), and instead of buying a whole new unit, buy another CMP 122200100 inverter/charger and run them in parallel to achieve the power i need for my summer trip. I now see that it appears this part# has been discontinued, but replaced with PMP 122200102. Can i purchase this new part # and run the 2 in parallel still? or are the changes significant enough that they will not work together?
It looks like you can get one ebay. Not sure where you are from. You could look at getting a 5000va model as well.
Parallel installations are never quite 2 x the unit installed.
It is much better to buy a larger unit outright.
That being said also setting up a parallel connection with an old and new unit is not advised in any case as component ageing is also a factor.
At the end of the day though there are other options as mentioned by owenb79