I just got an AC200MAX - also have (4) Renogy 200W panels. I see in the manual an “optional” part, this D300S Module.
I assume I can wire the 4 panels in series, correct?
Why do people need this Step Down Module? Don’t want to damage anything but can’t find any documents that say when it is needed.
Your help is greatly appreciated.
What’s the maximum voltage on the panels (VoC). As long as that added up is less than the max on the bluetti then you are fine.
Four in series are fine. The D300S is for those that have an existing higher voltage rooftop array they want to use with the AC300.
Thank you for the reply - The Panel Voc is 27, x 4 panels = 108 V. AC200Max says it takes 10-145VDC, 15 A. So voltage is ok for that
(could actually run 5 panels voltage wise except the MAX says 900 W maximum, but the voltage would be OK). Have to test it all out. Guess if 4 panels is showing less than 800 W it might be possible to add another panel to get the quickest recharge.
You can safety exceed the maximum wattage, just not the maximum voltage.
Think of it this way - the MPTT controller pulls power like your TV pulls power from the wall socket.
The wall socket can give you, say 2000W, but the maximum the TV can pull is 120W.
So you can give the AC200Max 1000W but it can only pull 900W so you are fine.
I actually find the 900W to be a bit of a soft limit as I have seen my unit take in 930W for a bit of time on a nice sunny day with my 975W array.