Bug in Venus OS v3.52 ? 3 x MP-II 48/5000 15 kWh battery with CAN-BMS Grid meter present All loads on AC-out, except Fronius inverter on AC-in Raspberry Pi with Venus OS supplied by the battery, otherwise no DC loads DESS off With peak shaving = “Always”, the battery continues to discharge wi…

[image] grua: In my opinion, there is no reason for this behaviour if the grid is stable and there are no extremly high load-peaks? I’ll second this…at last this is what I understood with regards how peak-shaving should work.

I have this issue as well on a system I am commissioning. I have: 1x MP-II 48/3000-35-32 Cerbo S GX Firmware v3.41 Latest ESS assistant (January 2025) all loads connected on AC-in. No loads connected to AC-out (yet). CT clamp installed at grid connection point. The maximum grid supply @230VAC …

Im observing this behavior lately too and don’t like it either. So using old firmware could be a solution, but then we are loosing bug-/securityfixes and maybe some useful features/improvements unlike peak-shaving without the option too disable it. Does this hurt battery life?

[image] Sean: While testing I also found that the peak shaving function seems to also exceed the maximum current draw advised by the BMS! This seems to be a major oversight as battery maximum discharge/charging rates advised by a BMS should ALWAYS take priority over any other settings What th…

Thanks that’s good info to know about peak shaving and how it operates. I have sized cables and fuses for the maximum amps I want to put on the battery packs, if on a hot day it’s not inconceivable that a fuse may trip under a peak shaving event. I had designed my system assuming that peak shaving …

You could at least set the current above which peak shaving should occur. If i’m not misstaken, a setting like this won’t cause any peak shaving bellow 40A per phase. [Screenshot_20250303_153044_Chrome] [image] Venus OS v3.30 - Peak shaving for ESS - Victron Energy Today we’re releas…

Hey Dognose I appreciate your responses on this topic. Your suggestion does work, I have tested this at various current settings to validate it does actually affect the operation of the peak shaving function as expected. In my case the maximum I can set it to is 50A, when my actual grid connection …

Are you sure about your grid? 100A (per Phase) is a huge grid connection for a private property. Is it possibly 100A Total, so 33A per Phase? The Idea of the Peak Shaving is to prevent your grid breaker from dripping. So, if your grid for example has 33A per phase, and you set the Prakshaving to 3…

Hi Dognose yes I have 100A single phase, 230VAC. 63A or 100A is typical for Australian houses. The setting in VEConfig for Shore current can only be set to 50A as far as I can tell. The original poster’s comment I believe is more that the inverter is pulling hundreds of watts from the battery when…

Bug?: Peak shaving drains battery permanently despite minimum SOC

Q&A and troubleshooting

JeroenSt July 25, 2025, 10:41am 14

I also vote for an option to set peak shaving to never as it drains my battery and my grid can supply 40A stable and even more for short periods.

Peak shaving on:

Peak shaving off (due to minimum soc):

Venus OS v3.70~35 available for public testing

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Bug?: Peak shaving drains battery permanently despite minimum SOC

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