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Thread: Multi Plus II
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01-25-2023, 12:35 PM #11
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I am guessing that the way you have your batteries wired together is causing your voltage to sag, or, the internal BMS is limiting the amperage output of both batteries to just the output amperage of a single battery.
To fix this, you need to wire your batteries using a "Buss Bar" system (each battery is wired to a Buss Bar and the load is taken from the Buss Bar instead of the battery posts). When you wire your batteries to a Buss Bar, each battery can contribute 100% of it's rated capacity to the load, versus, both batteries being limited by the first battery in the parallel configuration.
Here is a research paper explaining why a "Buss Bar" system is better...
And here is a picture of the type of Buss Bar I am talking about...David and Peggy
2019 Ford F350 Lariat, 6.7L Diesel, Dually, Long Bed
Running with 20k Reese Goosebox (Love It) and Ford Factory "Puck" system.
Stopping with 8,000 lb Disc Brakes and Titan Hydraulic over Electric Brakes system.
Powering all this fun with 1200 Watts of Solar, two Tesla, Model S, battery modules, 24 volt Victron Inverter.
2018 Solitude 310 GK
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01-25-2023, 08:17 PM #12
Multi Plus II
I agree with this especially when dealing with such a large battery bank. Additionally, I might add that it may also be good to take the batteries out and charge them separately with an external charger until they get to a known 100%, otherwise the system may be reporting an incorrect value. One battery may be at a different SOC than the others. Starting of from a known good point can help with that.
Good Luck!
Bill2019 GMC 3500 SRW Sierra Denali Duramax
2020 Reflection 315RLTS
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01-25-2023, 11:42 PM #13
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I've seen a couple of installs now with the MP-II mounted horizontally on top of the dog house. Any concerns about heat build-up inside the MP-II?
2022 Momentum 351M-R
2019 Ford F450 Platinum CC 6.7L Powerstroke FX4; Truck Covers USA American Work Tonneau; B&W 25K hitch; Airlift 5000 Ultimate+ w/WirelessAir; ZRoadZ back-up lamps
Gone: 2018 Reflection 28BH; 2017 Ford F350 Platinum CCSB 6.7L Powerstroke FX4; 2015 GMC Denali 2500HD CCSB Dmax
Gone but still in the family: 2004.5 Chev 2500HD CCSB LTZ Dmax
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01-26-2023, 05:59 AM #14
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01-26-2023, 06:01 AM #15
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01-28-2023, 11:41 PM #16
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Someone asked to see pictures of the install. Here are a few. You can’t see all the panels because there are 1-2 behind me near the ladder. I have a total of 9 panels: the 350W that came with the trailer and 8x 200W panels I installed.
You can see a picture I took of the Cerbo GX in installed by the TV. This was a rather humorous thing that happened: my wife was warming something in the microwave, one of the kids had a hair dryer going in the bathroom and the A/CS we’re running. It’s not every day I see 6kW getting pushed through the trailer, of course!
I apologize that the pictures are flipped around. I’m posting from my iPhone and Apple loves to store things flipped. I’ll try to correct when I get near a computer.
Last edited by xxn5ac; 01-28-2023 at 11:54 PM. Reason: Spelling
Steve & Lori Hicks and Luna, the wonder dog - Liberty Hill, Tx
2022 Solitude 390RK-R
2022 3500 Ram Limited Longhorn Mega Cab 4x4 SRW - 6.7L HO Cummins with Aisin Tranny
N5AC
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01-29-2023, 11:05 AM #17
Looks awesome! Thanks for sharing!
On Edit: I rotated the pictures.
BillLast edited by Redapple63; 01-29-2023 at 11:36 AM.
2019 GMC 3500 SRW Sierra Denali Duramax
2020 Reflection 315RLTS
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01-29-2023, 11:36 AM #18
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01-29-2023, 02:18 PM #19
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Last edited by ExNihilo; 01-29-2023 at 02:26 PM. Reason: picture orientation
Ex-Nihilo
2022 2970RL (Fabricated 1/4 Inch Bumper w/ RV Generator Boxes)
1200AH Lithium, 1000w Solar w/ Victron Multi-Plus II
5.5K Axles- EOH Disc Brakes- Hensley Arrow
Road Master Slipper Springs
2021 RAM Longhorn 2500 Cummins 6.7
Chattanooga TN
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01-29-2023, 02:52 PM #20
2022 367BHS Reflection 5th wheel ...
Today, 07:31 AM in Trailers For Sale & Wanted