I've been exploring the overload limits of my Rosie, and today I realized that using the mngp2 displayed numbers for the L1 and L2 output doesnt show the actual load and output on the legs when into surge territory, the numbers show significantly less than whats going on.
I ordered a victron energy meter so I can track the difference between actual L1 and L2 and mngp2 displayed output, just curious if there's a firmware tweak that could be done or if its a side effect of how the Rosie protection system functions.
Quote from: Brucey on June 23, 2025, 05:21:08 PMI ordered a victron energy meter so I can track the difference between actual L1 and L2 and mngp2 displayed output, just curious if there's a firmware tweak that could be done or if its a side effect of how the Rosie protection system functions.
@Brucey, were you able to use that victron energy meter? I was looking at that recently to use it to supply info to a CerboGX about the AC info as I am still running a Magnum I/C. (hoping to replace that this winter with a big rosie). But info on anyone actually using the Big R in a motorhome appears to be top secret information. Even Midnite cannot point me to anyone that has done this. -Bill
Quote from: bigbillsd on November 18, 2025, 02:10:04 PM(hoping to replace that this winter with a big rosie). But info on anyone actually using the Big R in a motorhome appears to be top secret information. Even Midnite cannot point me to anyone that has done this. -Bill
I have a RosieRV in my Class C with two EG4 100Ah 48 volt Lithium server rack batteries. I also have a Samlex 1200W 12 volt inverter running off the two 100Ah 12 volt lithium house bateries. I installed a breaker box with 6 spaces and moved the heavy loads over to it. Rooftop Rec Pro AC/ Heat pump, electric hot water, microwave. The Samlex runs the lite loads such as slide outlets for laptop and cell chargers, TV's , WiFi router, network switch, NAS server that holds movies and TV shows.
The Samlex gets its AC IN from Rosie so after Rosie reaches low battery disconnect the 12V system kicks in and runs off the house batteries. This usually gets me through the night when boon-docking.
I have a Victron Orion 12V to 48V converter/charger that puts out 380 watts at 48V (8 amps)to give the 200Ah battery bank some charge while driving.
Everything seems to work just fine...
Quote from: bigbillsd on November 18, 2025, 02:10:04 PMQuote from: Brucey on June 23, 2025, 05:21:08 PMI ordered a victron energy meter so I can track the difference between actual L1 and L2 and mngp2 displayed output, just curious if there's a firmware tweak that could be done or if its a side effect of how the Rosie protection system functions.
@Brucey, were you able to use that victron energy meter? I was looking at that recently to use it to supply info to a CerboGX about the AC info as I am still running a Magnum I/C. (hoping to replace that this winter with a big rosie). But info on anyone actually using the Big R in a motorhome appears to be top secret information. Even Midnite cannot point me to anyone that has done this. -Bill
Not yet installed but Victron did issue an update saying the power meter no longer needs 0.5A breakers or fuses on the L1 etc so that does simplify installation.
Quote from: Wizbandit on November 19, 2025, 06:45:38 AMQuote from: bigbillsd on November 18, 2025, 02:10:04 PM(hoping to replace that this winter with a big rosie). But info on anyone actually using the Big R in a motorhome appears to be top secret information. Even Midnite cannot point me to anyone that has done this. -Bill
I have a RosieRV in my Class C with two EG4 100Ah 48 volt Lithium server rack batteries. I also have a Samlex 1200W 12 volt inverter running off the two 100Ah 12 volt lithium house bateries. I installed a breaker box with 6 spaces and moved the heavy loads over to it. Rooftop Rec Pro AC/ Heat pump, electric hot water, microwave. The Samlex runs the lite loads such as slide outlets for laptop and cell chargers, TV's , WiFi router, network switch, NAS server that holds movies and TV shows.
The Samlex gets its AC IN from Rosie so after Rosie reaches low battery disconnect the 12V system kicks in and runs off the house batteries. This usually gets me through the night when boon-docking.
I have a Victron Orion 12V to 48V converter/charger that puts out 380 watts at 48V (8 amps)to give the 200Ah battery bank some charge while driving.
Everything seems to work just fine...
If I load up say L1 of my Rosie with microwave, airfryer, baseloads, the actual load is around 4kW, in Victron vrm I can see the dc load of 4kW+, however on the mngp2 display where you have it showing both legs output numbers, L1 will show something like only 2kW. Which honestly wouldn't be a problem but you dont realise you are loaded up on one leg unless maybe you see the red light start blinking indicating it'll shutdown with overcurrent protection soon.
Ideally the mngp2 numbers would match reality so its easier to balance the legs.
Quote from: Brucey on November 19, 2025, 11:18:46 AMIf I load up say L1 of my Rosie with microwave, airfryer, baseloads, the actual load is around 4kW, in Victron vrm I can see the dc load of 4kW+, however on the mngp2 display where you have it showing both legs output numbers, L1 will show something like only 2kW. Which honestly wouldn't be a problem but you dont realise you are loaded up on one leg unless maybe you see the red light start blinking indicating it'll shutdown with overcurrent protection soon.
Ideally the mngp2 numbers would match reality so its easier to balance the legs.
Rosie is limited to 3500 watts per leg and that's at a power factor of "1". Most setups hover around PF of .75 to .80 which means an overload could be triggered at around 2800 watts on a leg. Rosie does not allow 7000 watts on a single out unless you combine L1 & L2 in a 120/120 Topology which requires connecting L1 & L2 together on both AC IN and AC OUT.
Quote from: Wizbandit on November 19, 2025, 04:03:23 PMQuote from: Brucey on November 19, 2025, 11:18:46 AMIf I load up say L1 of my Rosie with microwave, airfryer, baseloads, the actual load is around 4kW, in Victron vrm I can see the dc load of 4kW+, however on the mngp2 display where you have it showing both legs output numbers, L1 will show something like only 2kW. Which honestly wouldn't be a problem but you dont realise you are loaded up on one leg unless maybe you see the red light start blinking indicating it'll shutdown with overcurrent protection soon.
Ideally the mngp2 numbers would match reality so its easier to balance the legs.
Rosie is limited to 3500 watts per leg and that's at a power factor of "1". Most setups hover around PF of .75 to .80 which means an overload could be triggered at around 2800 watts on a leg. Rosie does not allow 7000 watts on a single out unless you combine L1 & L2 in a 120/120 Topology which requires connecting L1 & L2 together on both AC IN and AC OUT.
I understand. I'm talking about the displayed numbers, if you press INV then turn the dial so you see L1 and L2 output numbers, when operating in its surge range of operation (60A for 60 seconds). Basically when you exceed 3500W leg imbalance temporarily, that mngp2 view actually shows util of say 2kW of L1. Instead of 4kW. Something to do with the mosfet desaturation to deal with the surge operation? If the loads are balanced, say 3kW each leg the mngp2 numbers are accurate.
I am going to start a new thread here to ask questions to see if I can use the Rosie to power my whole coach.. @wizbandit and @Brucey
Quote from: Brucey on November 19, 2025, 04:55:32 PMQuote from: Wizbandit on November 19, 2025, 04:03:23 PMQuote from: Brucey on November 19, 2025, 11:18:46 AMIf I load up say L1 of my Rosie with microwave, airfryer, baseloads, the actual load is around 4kW, in Victron vrm I can see the dc load of 4kW+, however on the mngp2 display where you have it showing both legs output numbers, L1 will show something like only 2kW. Which honestly wouldn't be a problem but you dont realise you are loaded up on one leg unless maybe you see the red light start blinking indicating it'll shutdown with overcurrent protection soon.
Ideally the mngp2 numbers would match reality so its easier to balance the legs.
Rosie is limited to 3500 watts per leg and that's at a power factor of "1". Most setups hover around PF of .75 to .80 which means an overload could be triggered at around 2800 watts on a leg. Rosie does not allow 7000 watts on a single out unless you combine L1 & L2 in a 120/120 Topology which requires connecting L1 & L2 together on both AC IN and AC OUT.
I understand. I'm talking about the displayed numbers, if you press INV then turn the dial so you see L1 and L2 output numbers, when operating in its surge range of operation (60A for 60 seconds). Basically when you exceed 3500W leg imbalance temporarily, that mngp2 view actually shows util of say 2kW of L1. Instead of 4kW. Something to do with the mosfet desaturation to deal with the surge operation? If the loads are balanced, say 3kW each leg the mngp2 numbers are accurate.
Brucey:
When an imbalance occurs, Rosie acts strangely. It happened to me with a 120V water heater. From 0V to 3500V or more. The red light will come on "overload" "I think I saw that". I never looked at the mngp2 L1 L2 to check the imbalance voltage. Solution 240V water heater.