- Joined
- Nov 3, 2019
- Messages
- 2,920
- RV Year
- 2022
- RV Make
- Newmar
- RV Model
- London Aire 4551
- RV Length
- 45
- Chassis
- Spartan
- TOW/TOAD
- 2020 Jeep Wrangler Unlimited Rubicon
Neal - You are missing a key point. Nothing being discussed cares about the brand of charger, but not having a Magnum puts you at a disadvantage unless you are taking data from the EMS and responding to the commands designed by EMS to manage the voltage.Let's take a step back. Many of us, self included (guilty as charged) have Magnum on the brain. @Joe Hogan has Victron as do I. Modern inverters such as Victron are "smart" inverters and adjust charge rates, etc. as needed. The term "max charge rate" is a Magnum term, that is not present in Victron. Victron's inverter has you enter the shore current limit - i.e. what is the size of your input you're connected to. If connected to a 50A pedestal, this can be set to 50A, if GEN (for me) then 30A, if connected to a 120V/15A plug then 15A. It has nothing to do with charge rate. There is no setting for such that I can find via the Cerbo GX, I'd have to check the BMS, etc. via Bluetooth to see more settings available.
From the Victron manual, the charge rate is taken from the surplus after the loads are met:
The parameters screenshot below is not settable, it's per the BMS as limits per type of battery. It doesn't mean this is a max charge rate or anything of the like of Magnum.
As to running on GEN the Cerbo GX new UI has great info and can show you the watts in, watts out, etc. You can look at the detail of supply and demand easily. Also VRM has numerous charts you can use and learn how it works and manages the loads, charging, etc.
Cerbo GX firmware 3.54 as of this posting:
View attachment 27126
View attachment 27125
Your victron is only as smart as the data it has. Victron does not monitor any other loads. According to the documentation, the line rate limit is how the max rate is set. This is identical to magnum, and only the wording is different. If you set to 30AMP line, it will consume 30amps during a bulk charge. The instructions are very clear that you should set this low enough to allow of other devices.
With a charge rate of 30 amp, and ignoring all the other consumers of power, you are taking 30amp from L1. If you have a 2nd charger, and its installed properly, then it will take power from L2.
When being stored, or only using 12v appliances, you can safely operate at 30 amp and never have a problem. Having any other power consumed from the power will also take power from L1+L2. The EMS job is to adjust the charge rate as part of charger before it shunts power on other devices. It will shunt power, but the timing can sometimes be too slow.
There are other power sources that do not have the ability to shunt. The refrigerator, outlets in the RV, etc.
With a 10KVA, loads of 8amps can be enough to trip the breaker. With a 7500KVa generator, 31.25 is the max amps.
You feel comfortable with your setup, and I am certainly not telling you how to run your coach. I am just explaining the science behind the settings and educating others on how this works. @Joe Hogan may benefit from some of this knowledge. If not, feel free to scroll on. I just enjoy the topic and do this daily in my work when designing rack power loads for datacenters. That environment is very different from RV, as guessing is forbidden, and even a 1amp out of spec is reason to fail an audit.
If I owned a Victron, I would set it to a max rate of 20amp for daily use on 50amp, and 5 amp for anything less. That is just me, not a recommendation for others.