I run a Samlex EVO 4024.
I have no Grid Power but the inverter comes with Dual VAC Input (Grid & genset) with a built-in Fast Response ATS, this is the same on the new version. Of course all very well documented, you have to wade through a heap of info ! It cannot be said they leave much unaddressed. Note that most folks do not realize that the Default Charge Rate is LOW ! The 24V model can do up to 100A.
Because I use a PURE SINE Inverter Genny (Champion 4650W) I have limited the Charge rate to 80A @ 24V which still allows for full Passthrough Power to house while the battery bank is charging.
CATCH ! At first I was FLA back in the day & used my Construction Generator which is Mod-Sine, the Inverter/Charger will NOT correct for it, what goes in is what comes out, this is quite noticeable on electrics & surge loads when a motor starts (fridge, well pump etc). It will also vary Frequency between 56Hz-64Hz and I can tell you "stuff don't like that at all" and you have to program the EVO to "tolerate" those limits otherwise it will cut off. If memory serves by default it is limited to 58Hz-62Hz. I've retired my Construction Genny from doing any such work quite a while back after I started implementing LFP Battery Packs. To put it nicely, it got gnarly.
Using an Inverter Generator that outputs PureSine made everything so much happier ! The digital clocks no longer Lose or Gain time (MSW at work with shifting Frequencies), the Charger actually runs a bit cooler and better (more efficiently). For 24V/80A, it is pulling 120V/23A from Genset.
I have done Full Inverter Charging WHILE getting full 79A on top from my Midnite Classic 200 with 159A hitting the battery bank (now at 1293AH). During my Thrash Tests, I had the Classic 200 pushing 79A, the Inverter-Charger pushing 80A + An external charger pushing 100A for a total of 259A to Bank. No issues to note other than the 4/0 wire got a "warm" but NOT HOT ! I use Roral Excelene Ultra-fine wire welding cable by Southwire.
Solar Controller attached to EVO NOTES:
I will be adding a 50A (Max Limit) SCC to the Inverter's SCC Port (May possibly use my Spare Midnite Kid for this) BUT this will also have a BREAKER between the Inverter & SCC, this IS Required as the EVO has no internal breakers. This is also why you have to have a Breaker between the GenSet & Inverter plus a Breaker from Inverter to VAC Sub-Panel. DO FOLLOW THEIR GUIDELINES !
FYI:
The EVO Series does have ModBus RS485 AND CanBus ! They have not made the Protocol stacks public and there is no Application to monitor or administer the EVO. You can "try" to sniff it out if you wish. I do have the ModBus Stack but under a Dev NDA and cannot share it.
RJ-45 Jacks for Communication Ports “COMM 1” and “COMM 2” - For RS-485 networking and MODBUS Serial
RJ-45 Jacks for Communication Ports “COM 3” and “COM 4” - For “CANbus” Serial Communication Protocol (for future use)
ALSO, Note that the Batt Temp Sensor can ALSO be used to control charging (On/Off) with a Lithium Smart BMS, see product specific manual. It will require an NO Solid State Relay. * NOT ALL BMS' can do so !
Hope it Helps, Good Luck.
Steve
PS, please do not ask for the protocol stack info, I cannot share it.