Rec bms contactor. REC-Precharge Module V3.

Rec bms contactor Protective OFF. We're offering an all-in-one kit to easily build your own energy storage system using the REC Active BMS. com; www. Features: - robust and small design - low power consumption @ 11-68 V DC - 2/4/8/12 s delay - integrated 66 Ω power resistor - 2 A open collector contactor coil drive - This kit is for use with the new 2Q BMS and includes 3 quality silicon coated pre-wired cable harnesses: 1) 16 Cell tap harness with 1-M (3 ft ) leads 2) Input/outputs prewire for remote relays, interlocks and contactors and remote ON/Off power switch 3) CANBus cable with M-12 adapter (Victron and SMA RJ45 versions REC-BMS offers a full line of accessories to build out and integrate your professional grade BMS system. I want to have seperate contactors for charge and discharge. I'd love to know if there is a way to reset the contactor after the REC bms has disconnected due to low voltage that doesn't include using the REC BMS PC software. 150A Bosch alternator + Mastervolt Regulator. Oct 15, 2022 #43 Just my 2 cents from my experience, with what I would call "middle range mail: info@rec-bms. I have installed many REC-BMS systems using contactors and the REC precharge module, i don’t have any experience with the use of a shunt trip breaker. If on the controlled side when contactor is off REC can not control the contactor. The BMS had opened (broken the circuit) the contactor and I saw no other way to reset it BMS Connect - Free download as PDF File (. sensor wires (2), and remote ON/OFF switch, unless you are just replacing a unit or doing a custom installation. Ha, maybe I wasn't clear. 0 A Off Grid and Marine Energy had a very nice sale on the Tyco 500A contactor for use with our REC BMS on our large LiFePO4 house bank - it will be perfect for our setup. Now I dont use the rec bms (but the jbd-sp040s020), can the rec bms pre-charge work as stand-alone? or potentially work by the relay of the BMV-712? T. Compatible with CAN supported ESS inverters/chargers for integrations in PV systems. Includes small aux. REC Q BMS unit and a high input capacitance system (SYSTEM). This last discussion FINALLY added it all up to what made sense to me about the load dump! Thanks @VanGoSki do you think it is a good idea that using the a separate switch to shutdown regulator power in addition to main battery switch. 1 for Dual Latching Relay Systems . The document provides a diagram and description of a battery management system (BMS) that includes 16 lithium ion cells connected by cables to bus bars, a 200A fuse, 200A shunt, 48V DC contactor, and REC BMS device. Now turn on the BMS and measure system voltage. 1 Off Grid and Marine Energy had a very nice sale on the Tyco 500A contactor for use with our REC BMS on our large LiFePO4 house bank - it will be perfect for our setup. Use the Batrium to activate a precharge circuit along with the contactor (can use the REC precharge unit). But the contactor is in my POS+ path between fuse and POS+ bus bar. After charging the bank at around 250a for 3. Victron also has a forum for REC BMS which is a plus; not official support but pretty close. It supports multiple Lithium-Ion chemistries, offering features like single cell voltage and resistance measurement, SOC/SOH calculation, temperature protection, passive cell balancing, shunt current measurement, multiple isolated Off Grid and Marine Energy had a very nice sale on the Tyco 500A contactor for use with our REC BMS on our large LiFePO4 house bank - it will be perfect for our setup. Jul 18, 2021 #43 For what it’s worth, I have a 4s4p system with 16 280 ah cells from Amy Wan in a van build. In my case, the high side bus (including the inverter/charger) is on a 500A contactor, but I've fused it down to 350A. To get that size of amps you probably need to use a contactor. Our customized solutions are implemented in diverse applications: planes, boats, hybrid and electric cars, test systems, motorcycles, solar powered REC ACTIVE BMS 4 www. com Table 2: BMS unit connections. Professional liveaboard customer needs reliable power for work. The non Victron REC shows this wiring, having charge and discharge contactor seperate WOW! I have spent all day reading this post. Joined May 3, 2020 Messages 10,443 REC-A BMS and Contactors/Pre-Charge/Etc. Skip to content REC 2Q BMS products are now back in Stock!! Country/region Off Grid and Marine Energy had a very nice sale on the Tyco 500A contactor for use with our REC BMS on our large LiFePO4 house bank - it will be perfect for our setup. We have 12 x Eve 280ah cells wired in 3p4s We’re now at the stage of programming our settings and connecting our Rec Active BMS, Victron 3000 kva inverter and battery protects, which we have one for 12 v load and one before batteries for incoming charge from solar, wind etc. com 1 Features: - robust and small design - low power consumption @ 11-68 V DC - 2/4/8/12 s delay - integrated 66 Ω power resistor - 2 A open collector contactor coil drive - reverse polarity protection - over-voltage protection - one-year warranty mail: info@rec-bms. REC-Precharge Module V3. They don't. I install a simple 608Ah REC-BMS system. We specialize in applications for managing battery systems. Prewired harnesses make the installation much faster. Check out the thread on it in my signature. The purpose of the circuit is to power the auxiliary relay at BMS startup and shunt the contactor with a low value resistor for charging the capacitors inside Multi. Lead is dead, officially. The yellow trace is a probe measuring across a 50mv/500A shunt on the battery negative. REC-Precharge 12V 608Ah REC-BMS. When the REC Q internal relay is opened, Vbat is removed from the REC PRE-CHARGE BMS+ input. I know these are legs of a transistor and doing some research, it sounds like Regarding REC BMS Contactor, can't find description on the wiring in documentation. 5hrs I discovered the contactor would not close after opening the circuit. REC Q BATTERY MANAGEMENT SYSTEM 16S Our REC BMS SI/Q series BMS with integrated CAN communication protocol can manage up to 16 cells in series and supports most cell Main fuse placement question using REC BMS, Contractor, Pre-Charge unit and Victron equipment My understanding is that the fuse is there to protect the cable, and not the contactor. I used the rec bms with Tyco contactors and it’s been working great after some tweaking. WS500 compatible. REC sells the modules to drive these or you can simply use the simple circuit as posted in the largest LFP thread on the forum. A new process REC BMS wire marked "Relay DCH NO" when cross referenced to the manual is called "main relay normally open" which is the wire the manual says to use to connect to the small red wire on the connector/relay. Relevant Details about BMS' Here are a few key details that people often inquire about regarding Lithium Battery BMS's: 1. connection description 1 Internal Relay – house system contactor control Normally closed 2 Internal Relay – house system contactor control Fused input 3 Internal Relay – starter contactor control Normally closed Higher Wire is proud to be offering REC 2Q BMS kits for our customers! Released in 2023, the 2Q is the latest smart BMS from REC, and can talk to various charger/inverter manufacturers. The cons is We use REC BMS for larger builds, especially those that want to take advantage of CAN communication with Victron, SMA and other inverters or charge controllers. The BMS doesn't actually pass the current, so the current is limited by the contactor chosen and any shunt that's part of the system. While the CAN bus side of things seems to be working fine, I can't seem to get the BMS to send out anything via pin-4 so as to energize my Pre Charge module and I have a LiFePO4 house bank on my boat that I am setting up with a REC-Active BMS. Contactors/ Relays Blue Sea Battery Switch 350A 3 Position w/AFD. So now it makes no sense whatsoever to run lead batteries in a cruising boat. Batrium, Rec-Bms, and Orion are three bms’s that can handle any size of amp draw (depends on the contactor you choose). The REC BMS triggered the contactor to open due to battery low voltage and shut off I talked to REC-BMS on how they would do this system and they advised using 4 BMS's (1 master that talks to Victron through CANBUS and 3 slave BMS's on each battery pack). If OGME has what I need, I’ll definitely be Rec-BMS + Raspberry Pi (No Cerbo Issue) REC BMS, Wakespeed CANbus alternator controller - how to connect to Cerbo GX. The pins on the BMS which the pre-charge relay would connect to are labelled "emitter" and "collector". Reactions: SupraSPL and Ampster. com. REC 2Q BMS: from 4 to 16 in-series connected cells per unit; single cell voltage measurement (0. To do that with their Master and two slaves it's going to be about $2100 - so it ain't cheap. Comment. I have a REC ABMS Victron compatible, and a Cerbo GX, a Victron MPPT and a Victron DCDC charger. I bought the 2 contactors through REC, and yes on the pre-charge module. rec-bms. We will also go into detail about how we wired and set up each of these components. It also includes the wifi module, which is required to program the BMS, as well as an I have a REC Q BMS which I opted not to buy the pre-charge relay for. REC BMS has customized solutions that can be implemented in diverse applications such as planes, boats, hybrid and electric cars, test systems, motorcycles, solar powered plants, energy storage, and more. Anthoney D. And thats great feedback from REC regarding the wiring and Off Grid and Marine Energy had a very nice sale on the Tyco 500A contactor for use with our REC BMS on our large LiFePO4 house bank - it will be perfect for our setup. 1 for Dual Latching Relay Systems I am a bit confused about how to wire my setup. It supports Active Balancing, 2 relay outputs, 2 opto outputs and up to 8 temp sensors. LLT which are in a very good price level and more technically up to date than REC and other BMS Systems for 500-1000 €. W. Would get your info direct from REC: If the REC BMS needs to open the contactor to protect the cells from overvoltage, there is sufficient time in the CAN bus protocol for the WS500 alternator regulator to take the alternator off-load before the BMS opens the contactor. 1 Auxillary Alternator with Nations/Wakespeed/REC-BMS. com Features: - robust and small design - low power consumption @ 11-80 V DC - 1/2/4/8 s DIP switch delay settings (default single coil relay/s 4 s delay) - up to 120 V, 4. I couldn't get my systems back online after a LVD until I set a new low voltage parameter. Great people! Great communication, prices and support. contact for status monitoring or system interlocks. Is this correct? The REC BMS Master system manages high voltage up to 600V or high current up to 7500Ah, integrating up to 15 Slave 16S BMS units. Be sure to include the custom wiring harness with cell & relay wires, CAN and RS485 cables, temp. In the REC Active BMS manual, this contactor is shown (leading to "non-Victron equipment" which is evidently the loads). Active BMS for 12V Systems. (Not required for use with your REC BMS) IHV200 High Voltage DC Contactors •Designed to be the smallest, lightest weight, lowest cost sealed contactor in the industry with the high current rating (carrying up to Rec-BMS + Raspberry Pi (No Cerbo Issue) How to connect 3 bms systems (REC bms) to a Cerbo GX over CAN-BUS. It is ideally suited to the latest in battery technology and includes CANBus and NMEA2k communications to integrate into an overall Energy Management Network and the REC BMS product line. I used Batrium (and really like it) and used a kilovolt EV200AAANA contactor ( you will need a slightly different one for 48v). Using a special Ecomomizer circuit they pull in the contact hard and fast to reduce arcing, then switch to a You should ask REC, how to set up the BMS to only switch the contactor on, to an energized system. You cannot separately aktivate charging and discharging with seems to be possible with MOSFT-style BMS. REC sees a lot of use on Victron hardware. The supported BMS are working with passive balancing mail: info@rec-bms. pdf), Text File (. mail: info@rec-bms. 1 for Dual Latching Relay Systems The REC BMS communicates via CANbus with all of our charge and major discharge sources to ensure that the The REC PRE-CHARGE will float its Contactor- output (it powers the Main Contactor coil via an open collector configuration) which deenergizes the Main Contactor coil and opens the Main Contactor. What is a BMS? A BMS, or Battery Management System, is an If the battery is fully discharged by a DC load (that the BMS can't control) then it will disconnect the main contactor which basically turns off the battery. When there is no grid available, you could use the light bulb over the contactor terminals to energize the system, only if the BMS detects proper voltage on inverter side, it should switch the contactor on. Select your options to build you own custom BMS kit and save 5% on all accessories! Works with most cell chemistries and 5-16 Cell packs with a 16-62 VDC range. com 4 General Description of the BMS Unit: The Battery Management System (BMS) monitors and controls each cell in the battery pack by measuring its parameters. In series applications each Off Grid and Marine Energy had a very nice sale on the Tyco 500A contactor for use with our REC BMS on our large LiFePO4 house bank - it will be perfect for our setup. I feel the BMS needs to get me four outputs. For Smart system integration it supports both Victron and WS500 communications on REC 2Q BMS CANBus Cable with a MATE-N-LOK connector to Victron RJ45 connector 2M (6 ft) Off Grid and Marine Energy had a very nice sale on the Tyco 500A contactor for use with our REC BMS on our large LiFePO4 house bank - it will be perfect for our setup. . System: 24V 16 EVE 280AH cells in a 2P-8S configuration. Joined Dec 8, 2020 Messages 29. The Wakespeed is configured as a slave to the BMS 2) Single Contactor controlled by the BMS disconnects both the battery from charge and loads during an irregularities, coordinating with the voltage regulator connected to the alternator. Exotronic 60A Mini Panel Mount Waterproof DC Circuit Breaker. It can be used in both parallel configurations where you have several cell packs working together and any one pack can be disabled without affecting the rest of the system. Our REC BMS Q series with integrated CAN communication protocol can manage up to 16 cells in series. Battery pack parameters such as voltages, current, Hi all, We’ve been building our system onboard our boat. But it's only a couple boat bucks so Late to the game but yes, the shunt is bi-directional and the newer version of the REC Active BMS has internal fusing for each cell and the relay. Product Facts Designed to be the smallest,lightest weight, lowest cost sealed contactor in the industry with its current rating In this series, we will share our research and thoughts as to why we selected REC BMS, the Victron Quattro inverter, the Victron Color Control GX, and the Victron Smart Solar MPPT solar charge controller. I am using a REC Active BMS connected to Cerbo GX, Multiplus Inverter/charger and Wakespeed regulator. The WS500 is a next generation Smart Regulator for Marine, Off-grid and RV applications. Is there a specific way it needs to wire for a flow or either way works? Thx. Joined Jul 24, 2020 Messages If I had a rec BMS, I'd have one main contactor for all failure conditions should there be a CAN failure(HVC, LVC, TEMP, Ect) conditions, and use a BP65 for my DC loads. It protects sensitive components like contactors, inverters, and dc-dc converters by slowly pre REC PRE-CHARGE UNIT. Only the connections relevant to the pre-charge Smart CANBus Integration of your off grid, marine or ESS energy system using REC BMS, Arco Zeus, Victron and Wakespeed WS500 products I got the advice to add a pre-charge (from rec bms) for my contactor last line of defense system (image below). Works as the primary on/off switch the BMS The REC 2Q is the next step in the REC BMS evolution. REC ABMS + Victron MultiPlus 12 / 3000 / 120 = Oscillating SoC The REC BMS Wi-Fi module allows you to control and monitor your BMS on your favourite browser using a Wi-Fi network in either a STA(Station) or AP(Access Point) configuration. Wtavern New Member. Tinned 50mm cable. REC ABMS + Victron MultiPlus 12 / 3000 / 120 = Oscillating SoC 1) The BMS controls charging by sending messages over CANbus to the Wakespeed regulator. Joined Feb 16, 2021 Messages 95. The little brother to the Tyco TE EV Series this is a budget contactor designed for smaller battery packs. For single BMS 4S applications up to 3,000 Ah capacity, the REC "Active" BMS will be your best option. Several systems use wakespeed WS500 * REC ABMS at $572 (with optional wifi module) is a very strong contender as well. If there is high input capacity (> 2,000 uF) at the charging sources/discharging loads, pre-charge should be used to avoid high current spikes when the contactor is turned on. Blue Sea Switch HD You would in effect need 3x BMS systems (controller, current sense, contactor, soft start etc), one for each paralleled battery, then a master unit to communicate with the 3 sub units (presuming the REC BMS MASTER UNIT 9M works, allowing parallel connections with the Active BMS - although I've not had any experience of that one so would need to mail: info@rec-bms. Off Grid and Marine Energy had a very nice sale on the Tyco 500A contactor for use with our REC BMS on our large LiFePO4 house bank - it will be perfect for our setup. Through this CANbus connection, the BMS can actively control alternator-based charging to ensure safe and optimal charging of LiFeP04 battery banks. 0 A pre-charge - The REC Active BMS Kit includes cables and WiFi module and is designed for 12V systems, providing advanced battery management with 2A active cell balancing. txt) or view presentation slides online. There is no documentation on how to wire the contactor to the BMS w/o the pre-charge circuit. Thread starter VanGoSki; Start date Aug 26, 2020; Prev. TAS CPA New Member. It has identification +/- in the data sheet and list them as POS and Neg. If OGME has what I need, I’ll definitely be REC Pre-Charge Unit is a compact device that prevents damage to your electrical system by eliminating high inrush currents during power-up. Joined Jun 4, 2021 Messages 1,526. Don't trust your safety and expensive battery system to a cheap or repurposed BMS! This professional grade BMS now supports 3 Outputs, 2 of which are customer configurable using the Wifi module. The BMS is working as it should, except for the fact that I can't seem to get the NO discharge relay (or any relay for that matter) to latch and supply voltage to the Precharge module and thus my main contactor supplying my loads. Also, the slowblow fuse on the relay works well with Tyco type contactors that have a high inrush current for a few hundred milliseconds. The REC ACTIVE which I use has signals for charge and discharge contactors. It looks like on the 2Q BMS you use the opto-isolated outputs I just fired up my Van electrical system for the first time and was very surprised by the size of the transient in spite of using the REC BMS Precharge unit set to 11 seconds. I'm using a REC BMS and a TE Kilovac 500a contactor. It includes the BMS, premade wiring harness, shunt and 200a contactor. toms Solar Wizard. 1 for Dual Latching Relay Systems The REC BMS communicates via CANbus with all of our charge and major discharge sources to ensure that the But - I'm guessing you're looking at about $700 all in for a single REC-BMS Active BMS with the contactors, shunt and such. REC BMS offers diverse battery management system configurations suitable for each individual customer, including additional programming and REC PRE-CHARGE UNIT V3. A . If you don’t limit inrush current it’s likely the contactor I installed one rec bms last month and i don't use this because im not sure about firmware compatibility and skylla charger was'nt stop charging before rec bms open the security contactor, even if can bus was ok, remote start stop charger working and Vmin cell and Vmax cell is known by cerbogx The cooperative effort between Wakespeed and Slovenian BMS manufacturer REC enables Wakespeed’s WS500 alternator to share connectivity with the REC BMS via a CANbus interface. The REC PRE-CHARGE will float its So even with the BMS's and contactors this is still going to be cheaper than replacing the lead. 0 V, resolution 1 mV) BMS Connect - Free download as PDF File (. New posts Registered members Current visitors Search forums Members. At system start up the REC Q BMS Disconnect the Contactor + wire from the pre-charge unit to disable contactor engaging. If OGME has what I need, I’ll definitely be I prefer the 7700 style and this is compatible with the REC BMS for sure. Ampster Renewable Energy Hobbyist. If the voltage stays Need some tech insight on REC BMS op. com 2 Features: - robust and small design - low power consumption @ 11-80 V DC - 1/2/4/8 s DIP switch delay settings - Up to 120 V, 4. Key components are labeled with their dimensions. I know more people would prefer contactors and the long list of features of the Rec BMS, but it's good to hear Strange issue I'm having, I have a 1200AH 24v LiFePo4 battery bank connected to four Victron Miltiplus 24/3000/70 charger/inverters. Aug 3, 2021 #1 Looking at the plans of others and also at REC's schematics, it looks like there should be two contactors. Novi trg 9, 6230 Postojna, Slovenia mail: info@rec-bms. a magnetic latching contactor but that required a custom PCB that will generate the necessary current pulse to open the contactor when the BMS relay opens.   Designed to provide unsurpassed battery management in 12 volt systems, the REC Active BMS delivers Schütz / Relais /Contactor als Schalter (gibt es aber Glaubenskriege ob das ein Vor- oder Nachteil ist) Der große Vorteil: das REC BMS hängt nie im Batteriestromkreis, nur der Shunt und das Relais, daher kann man da durchgehend mit richtig dicken Kabeln arbeiten. After the pre-charge timer the voltage should rise to at least 80 % of the battery voltage. What's new. REC Active BMS for Lithium cells is the first of its kind on the market providing active bi-directional balancing. Class T fuse with shunt and contactor mounted directly to a Victron Lynx Distributor. Inverter is Multiplus 3000. I followed the wiring diagram on the REC site (attached below), which broke out the Victron (Inverter) and non-Victron (house lights, refrigerator, etc) loads onto separate contactors. Contactor. If OGME has what I need, I’ll definitely be A major stumbling block is the BMS and the main contactor. meetyg Solar Addict. If OGME has what I need, I’ll definitely be Off Grid and Marine Energy had a very nice sale on the Tyco 500A contactor for use with our REC BMS on our large LiFePO4 house bank - it will be perfect for our setup. If OGME has what I need, I’ll definitely be Or use REC to control whatever size contactor you need. REC Active BMS relay for Contactor. com 3 . REC 2Q 16S BMS; 16S Cell wiring harness; Current and Temperature probe wiring harness; Power and I/O wiring harness; 500A current shunt; Wi-fi module and wiring harness; Just add cells, CANBus cable, field wiring and relay/contactor! The REC Off Grid and Marine Energy had a very nice sale on the Tyco 500A contactor for use with our REC BMS on our large LiFePO4 house bank - it will be perfect for our setup. It includes the BMS, wiring harness, shunt and 200a contactor. 8 cells built neatly into a solid battery box. Thread starter TAS CPA; Start date Aug 3, 2021; T. So it’s a proven solution. We have the first install next week with the new WiFi management module which looks really interesting.   Designed to provide unsurpassed battery management in 12 volt systems, the REC Active BMS delivers REC-BMS is the best one i’ve found, i also use Batrium and Forums. with time-set. Designed to be the smallest, lightest weight, lowest cost sealed contactor in the industry. Then the _NO one goes to the positive control line on Generally good. It seems that contactors are used in the more expensive BMS setups but there are quirks with using relays as well. 1–5. In my REC BMS system the fuse is after the battery and before the contactor, pre-charge bits etc seems to work fine. This REC Active BMS relay for Contactor. The capacity of the battery pack differs from one cell to another and this increases with number of charging/discharging cycles. REC is a world-wide company oriented in research and development of electronic solutions in environmentally friendly applications ranging from EV to PV installations. For precise current measurement we are choosing Shunt current sensor REC BMS. 1) HVC -- high voltage cut out that will trip the main contactor. 0 A pre-charge - integrated 15 and 30 Ω power resistor + 10 Ohm NTC - 6. The pins on the BMS which the pre-charge relay would connect to are labelled Figure 3 shows the integration of the pre-charge unit in a typical 24 V battery power system, using REC 1Q BMS with an internal relay control. This circuit will power on the contactor after 510 seconds and at the same time will disconnect the resistor. com Novi trg 9, 6230 Postojna, Slovenia mail: info@rec-bms. I built one of the first Wakespeed/REC-BMS ACTIVE systems in existence four years ago and helped Wakespeed work out the kinks with it. In most of the cases they use the REC contactor pre-charge module along with a BlueSea RBS-ML 500A contactor. I am setting up a LiFePO4 system for my boat. com 2 Features: - Bi-stable and mono-stable latching relay driver - 62 V DC max supply - 6 A coil drive with over current protection - 100 ms set/reset pulse - robust and small design IP 66 - extremely low power consumption - reverse polarity protection - over-voltage protection - one-year warranty Off Grid and Marine Energy had a very nice sale on the Tyco 500A contactor for use with our REC BMS on our large LiFePO4 house bank - it will be perfect for our setup. For example: The BMS which use contactors only have one contactor for Charge and Discharge. Since lifepo4 can tolerate overcharge better than it can overdischarge, that's why I'd have a dedicated BP65 just for the DC loads as you don't want that killer the battery The Tyco EV series relay/contactors are market leaders in providing high voltage, high current sealed fail-safe DC power switching. Page 13 REC ACTIVE BMS 4S Contactor Connection: Charging/discharging contactors are driven by charge/discharge relays in the BMS. com Rozna ulica 20, 6230 Postojna, Slovenia mail: [email protected]; www. 1 Novi trg 9, 6230 Postojna, Slovenia mail: [email protected]; www. If it was safe Rec BMS would save a lot of power and recommend a latching contactor and provide dual wire signalling for driving latching contactors. Build your kit and Save! WS500 Single Alternator Kit Builder WS500 Dual The REC SI-Q BMS Slave is built on the same platform as the standalone SI-Q Series BMS, but works in conjunction with a REC Master Controller for larger systems configurations. 2. REC also makes a good contactor based BMS, but I have no experience with it. CERBO canbus to REC BMS Wiring. It's more in the vein of the Orion BMS. com 4 side of the contactor 11 PACK- BMS Power supply negative (Cell 1 negative) 12 CELL 1+ Cell 1 positive 13 CELL 3+ Cell 3 Typical EV200 applications include battery switching and back-up, DC voltage power control, circuit protection and safety (36-95V coil) For medium size BMS safety interlock application, the EV200 series is hard to beat, with a 500 amp capacity. Given that it's contactor based BMS, the current it can deal with is only limited by the size of the contactors. Auxillary Alternator with Nations/Wakespeed/REC-BMS. Specifically i’m concerned with the durability of the breaker contacts if they are disconnected under load, it seems that while they have a DC rating they are primarily used in AC applications. External contactor is the only way to go. I forgot who did this but it isa 1,000Ah LFP battery and it’s been in use like this for many years. yxgysr almzgu cvlbik eyfsnl bst btyz gowokd djdir ousy sjxjft vynrdu tccep wiri hkkha bbw