XW Charge Rate issues

Dcline

I have (2) XW+ inverters with a 14KW Kohler generator with 830AH Fullriver batteries. 

My issue is I used to have the charge rate set in the SCP @ 50% & now the inverters won’t allow more than 25%. I have checked all connections and all is good. 

This has not been an issue for a few years.

Any thoughts would be appreciated 

Thanks

BB.

Is that 50% of generator DC output current @xx volts?

• 25% * 830 AH AGM battery bank charging current = 207.5 DCAmps
• 14,000 Watt genset * 0.8 Derated genset/AC output power * 1/240 VAC (?) battery bank = (roughly) 46.7 Maximum Genset/AC 240 VAC current draw for charging (max genset AC current to inverter-charger)
• 14,000 Watt genset * 0.8 derated genst/AC output power * 0.80 (minimum typical charger eff) * 1/58 battery bank = 154 Amps (rough estimate of Genset+Losses max DC charging current)

25% is probably the maximum DC battery charging current I would suggest (unless I am otherwise corrected by others that know more than I)--Check Fall River battery manual for maximum recommended charging currrent (typically 10-13% is a "good charging current" for lead acid long battery life).

The FullRiver manual suggests 20% rate of charge max nominal rate of charge. Or Icharge = 0.15 to 0.35 * C20 hour battery bank capacity (recommended "acceptable" charging range).

https://fullriverbattery.b-cdn.net/wp-content/uploads/charging-instructions-english.pdf

• 830 AmpHour battery bank * 0.20 rate of charge = 166 Amps Nominal FullRiver charging current for your bank

Numbers above are guesses... Don't know your battery bank (12/24/48 VDC) or AC line voltage (120/240 VAC) for your system. Also, the 0.8 charger efficiency is probably closer to 93-95% efficiency for your XW+ vs the 80% I used in the above examples (a bit more conservative).

-Bill

Dcline

Thanks

Battery bank is 48VDC & AC is 120/240V. 

Riley

I'm trying to recall what the charging % is based on  with the XW. I think it's the % of the input breaker from the generator. I would check that breaker setting (it's actually a value that  you enter into the SCP or Insight). Perhaps that's not set correctly... but doesn't explain why it would behave differently now.... 

BB.

I think I remember one AC genset input setting was based on--50 Amp breaker would be loaded to a maximum of 80% of entered breaker value--I.e., 50 amps * 0.80 = 40 Amp max genset draw (that 40 amps could be split based on need, between AC loads, battery charging, etc.)

-Bill "certainly know very little about XW family" B.

Dcline

Thanks Bill

Dave Angelini

Close Bill, Actually 60 not 50 but close enough.  50 is Outback Radian
That has changed with XWP that is also Soc controlled.
AC out always has priority over DC charging. Just set AC in amps to the breaker on the generator.

Dcline

Trying to revisit this again. I have 2 systems with the same generator and the same inverters. 1 system allows 50% charge rate and the other will not allow anything higher than 20%. What gives here?

Dave Angelini

Configuration programming is correct?

Dcline

Dave

it is correct. This system had been set to 50% for the last 3 years and now all of the sudden it cannot be set higher than 20%. I have checked all wiring at the inverters and the generator and all is good. If I set it up higher I can hear the generator start to get loaded and then the inverter goes into bypass (———) and then restarts. 

Yesterday the generator did trip off with a low hertz warning when I was trying to raise the % number. 

Dave Angelini

It is probably damage to the transfer relay ( Doubt it) the generator (Suspect it) the AGS, or your battery.
An AGM, so are the cells all the same in a static voltage test?
 Did you check all of the other settings (like AC2 input electronic breaker) in case they changed?
Easiest to borrow or buy another generator for test. They do have an endpoint!

For the test I would take AGS out of xanbus network, start gen with input to XW breaker open. warm up generator, close input breaker and charge. If you are not hearing the gen connect and disco, you have found the issue.

Dcline

Thanks Dave

I will do a bit more research and post results.