Hi all,
I'm stumped.
Equipment:
Grid-tied, no feedback.
All on the latest firmware.
VenusGX
250/100 with 3.5kw array
MPII 5kva
BMV712
150ah Lithium bank with 50mm2 cables Less than 4m return.
The Victron Wiring Unlimited says, under DC Ripple, I quote: When measuring ripple, remember that this only occurs when the system is under full load. The same applies as for voltage drop. Ripple can only be detected when the inverter is powering a full load or when a charger is charging at a high current.
The scenario of today's 2 x DC Ripples warnings on the Venus:
On a SOC van 99-100%
AC Watts for the two DC Ripples:
Ripple 1) 1712w down to 562w
Ripple 2) 602w up to 1380w then down to 332w
Sunny clear day.
So I did a test with SOC 94%
Load powered 2000w.
Added another 2000w, inverter running at 4048w.
Removed the added 2000w load, inverter running at 2000w again.
SOC down to 93%
Never a DC Ripple.
Why is that, that under a small load, I get a DC Ripple, yet under max loads, no ripple?
A trick I pull that removes 99% of the Ripples:
Ripples tend to happen when I higher volts:
Bulk : 55.2v
Float : 54.4v
But if I set parameters to:
Bulk : 54.6v
Float : 53.4v
Nearly no Ripples, as I don't get to 100% SOC fast. :-)
Regards
Jaco Reinecke