We decided to try a DC-DC charger from Renogy. This multi-stage, multi-input battery charger can charge a service battery from a starting battery linked to an alternator or by utilizing solar panels connected directly to the unit. DC-DC Chargers are essential components for properly charging and maintaining your second battery bank in your dual battery bank system. The charger needs to select the charging mode according to the battery voltage. See photo 1.2. 18-16AWG copper cable recommended. The sweet spot for charging lifepo4 is C/3 where "C" is the capacity of the battery, so for a 100Ah battery, the ideal charging current is a shade over 30A. This diagram shows the whole connection of the DC-DC On-Board Battery Charger. After install I received a dash light for . Let me know if I can be of any more assistance. The Renogy is $130 less. I had plenty of #4 wire available, so I could easily make a wire long enough to swing around the top of the existing 4 incoming connections to the shunt, and just add my fifth wire on top, and bolt back down the shunt bolt. The LC wire can automatically adjust the charging current to prevent excessive charging current from damaging the house battery. This will give maximum battery cell life. That seems to happen regularly on newer alts., so you need the signal wire attached to the D+ wire of the alt. I screwed down the DC unit to the wood blocks which Eddie had already connected to the Camper floor. This guy Matt at Adventurousway.com has some great info ok on with the show ! With up to 99% MPPT tracking efficiency and 94% convert efficiency, the charger can fully charge a 1kWh battery within 2 hrs with solar energy. So we did just that and changed out our 50A breaker for a 60A breaker. These six charging voltages meet the requirements of lithium batteries and lead-acid batteries in order to provide more charging options. This means, (in theory without any loss over the cabling runs), the DC-DC Charger can provide up to 480 watts of charging power to our batteries (40amps x 12 volts = 480watts). It came with a positive / negative alligator clip that you can just connect to your battery. Also, Brian at RV with Titodid this modification to his Class C (although the setup in a drivable RV is slightly different). / 1.3 kg Equalization Voltage: N/A Float Voltage: 13.2-13.8v Boost Voltage: 14.1-14.7v Operating Temperature: -20C to +50C I am experiencing the same problem for my 2.0 amp Renogy charger no green light. The new ground wire was working as expected, and the red dc wire was turning on the DC unit. This wire will handle up to 45A and reasonably hot temps inside the engine bay. And we decided to just shut it all down and have a well deserved adult beverage or two and catch the remaining bits of Arizona sunset. Well after having this fitted for just over 2 weeks I can honestly say how easy it was to fit. Compatible with a multitude of alternator types, the DC-DC battery charger offers correct charging for AGM, Flooded, Gel, and Lithium batteries. This was his first time installing a DC-DC charger in a towable camper, but he was up for it. Well minor issue on a recent trip when we finally really tested this setup. 18-16AWG copper cable recommended. I appreciate Eddie explaining ( a few times ) , the exact steps Id need to do to finish this one on my own. The DC-DC Battery Chargers are the most effective way to charge your house batteries from the starter battery. Exclusively available with the BT-2 Bluetooth Module accessory and Renogy DC Home App available on the IOS and Google Play Stores, you can monitor this device remotely and simply through your phone and stay constantly updated. High-Powered 550W Monocrystalline Solar Panel . And finally, connect the a DC positive wire to switch ON the converter and see if it works. hi Steve, thanks for reading my post. Opened up the hood of the truck and flipped the breaker to ON which means we were sending power from the truck battery to the DC Charger. I have dealt with Renogy Customer Service in the past, and they were very responsive. Is it necessary to connect? Due to afternoon shade and an AC-power heavy dinner (toaster oven, microwave) and heavy use of the 3 DC fans in the camper (it was 93F), we brought our Battle Born batteries down to 54% after morning coffee and a toasted bagel. Question: can I use a smaller gauge wire like a an 18 gauge wire instead of a hes y 4 g cable? So, we really dont need more battery capacity just an alternate backup system to recharge the batteries when there is no sun for the solar setup OR there was to be some sort of problem with our solar setup (such as a malfunctioning solar controller, etc.). DCC30S 12V 30A Dual Input DC-DC On-Board Battery Charger with MPPT. Their app is easy to use and understand so I am happy with my choice of purchase. I had our grey water hose, which I was willing to chop, knowing I could replace, re-cap when we got back to town. It allows me to charge my batteries with proper multi-stage charging by both my alternator AND solar panels. Both ways can be charged at the same time to minimize charging time. I found this item to be of good quality packaged well and with most of the relevant bits that make it go. Eddie then connected the DC positive wire from the green terminal left connector, to a test DC positive on our batteries and. See owners manual for more details. The RV came with a mechanical solenoid isolator but I believe it was broken. BUT (heres the issue) after 30 secs or so the Renogy starts turning on and off (internal protection?) Please note the LC cable is not included. Hello, thanks for the excellent post on adding a grounding cable from the (-) input of the DC DC Charger to the trailer frame ground wire. Lift off the seat, its heavy, I just sat it on a crate positioned between the two seats.5. 50A DC DC Board Battery Charger with MPPT Renogy 20/40/60A DC to DC Battery Charger Rover 20/30/40/60/100 Amp MPPT Charge Controller Rover Elite 20/40A MPPT Solar Charge Controller 40A Set w Holder ANL Fuse, 40 amp (40A ANL Fuse Set w/Fuse) Renogy One All-in-One Smart Panel System Energy Monitoring ; Nominal System Voltage : 12V DC : 12V DC Renogy's DC to DC MPPT on-board Battery Charger is designed to give you options! What is its purpose? step 11 : slippery silliness ! What will happen if the service battery is fully charged? Note: Our product department found that there are some errors in the paper manual attached to the battery charger sold before March , and now the manual on the website has been updated. Also note, I increased the breaker amps in a subsequent edit to this post. Filter By Request Wholesale Price REGO 12V 60A DC-DC Battery Charger Compare $499.99 Add to Cart DCC50S 12V 50A DC-DC On-Board Battery Charger with MPPT Compare $269.99 $339.99 This multi-stage, multi-input battery charger can charge a service battery from a starting battery linked to an alternator or by utilizing solar panels connected directly to the unit. Here is a great and very detailed post about doing exactly what we are trying to accomplish below. This side of the DC Charger is the outgoing power, which connects to the camper batteries. Very happy so far. A charger like the Renogy 12v DC To DC On-Board Charger is a great vehicle charging solution. This controller supports Gel, AGM, Flooded, and Lithium battery, but please make sure to set the correct battery type once it is installed. Please note the D+ Ignition Cable is not included. 3. 3. A DC-DC charger is, by its nature, going to limit how many amps it tries to pull from the source. In my latest RV mod, I install a high amperage 30A 12VDC port into the bed of my 2018 Ram 3500 pickup truck. hi Brian, probably no big deal to leave the 7 pin wired for trickle charge. 2. step 14 : Well, our travel plans were such that we had to get on the road, even though this install wasnt done. The DC-DC battery charger isolates the input and output to prevent voltage transmission errors and interfere with house battery charging. Now it was time to test our setup ! I ordered some more #4 welding cable, some more ring connectors, bought a good linemans cutters from Home Depot (to make a clean cut in the #4 cable), as well as ordered a manual hammer crimp tool to connect the ring connectors to the #4 wire. Charger then connects to two 12V 35aH solar AGM batteries from harbor . The system prioritises solar but in my opinion it would be better if it prioritised the alternator. 18-16AWG copper cable recommended. Renogy DC-DC Chargers support a variety . 3. The DC-DC battery charger is capable of identifying whether the generator is started, to prevent over-discharge of the starting battery and protect the generator. So far I love it and can highly recommend. Maximum System Voltage: 1500V DC (UL) Operating Temperature: -40F to 185F . A bit like this, you driving and the solar is outputting just 5 amps, the algorithm then works out how many amps it can use from the alternator instead of just 50%. As a bonus it can be reduced to half power if full output is not required (like for example the first few minutes after engine start with a timer relay). Biases to solar power when it is available. We recently reviewed some of their 100-watt, 12-volt solar panels, and we were impressed.So we were eager to find out whether the Renogy DCC50S 12V 50A DC Board Battery Charger meets that standard.. upate 6/18/2020 : we finally got back out on a trip since installing our DC-DC converter. I needed a reliable DC to DC charger with solar input which had a maximum battery input of 50 amps. We had followed the instructions as closely as possible. this was something I could handle on my own (with some advice from Eddie, naturally). here is a closeup of the anderson connector on the tail of the Truck (source) and the trailer side (load) the garden hose connector. This Renogy's DC to DC MPPT on-board Battery Charger has a built-in Voltage Sensitive Relay (VSR), thanks to which the charger will Trickle Charge the service battery and maintain its fully charged status, and will also Trickle Charge the starting battery via solar panels. So added a 60A rated relay to cut off the PV input, controlled by the D+ (engine on) feed on my Sprinter W906, so can charge LiFePO4 batteries at 50A from ALT input (need appropriately sized cable from starter battery) when the engine is running. Attach connector plug to the tailgate of the Truck. In countries like the U where the sun is low or never out at all, you need to add a solar power cut off switch, this will fool the charger in thinking its nigh so will go from 50% 25 amps per 50 mode to 100% mode. The idea here would be, in our case, to connect the on/off wire to the running lights of the truck, so that it would only be active if our running lights were on (either 7pin connected to the trailer OR we jump the 7pin with a fuse). See photo 5.8. The Terminal fuse protects the wire from the battery to the breaker, then the breaker protects the wire run along the length of the truck. To our surprise, upon arrival in Green River, after charging for only 1 hour, our 200ah battery was charged from 54% to 100% ! This implies that various levels are employed while the battery charges. The Renogy DC-DC Battery Charger is multi-certified to CE, FCC, and PoHs. Great bit ov kit once up a running would Recomend, im running 640 watt renogy panels, 2000w Renogy inverter, Renogy Bluetooth, x2 Renogy smart lithium batteries, and dc50 mppt charge controller. # 1. Please allow up to 1 to 2 business days for processing and 3 to 5 business days for shipping. Starts out fine when I run engine and turn on lights. Installing your own DC-DC Charger at home is actually incredibly simple when you follow this easy step-by-step guide! The D+ Ignition cable is a design method used to identify whether the generator is started. 18-16AWG copper cable recommended. Pass the two #4 wires through the floor of the camper into the battery compartment. This enables the backup battery's charge to be replenished quickly. 1. Below are the supplies I used to wire this in:Renogy DC-DC Battery Charger with MPPT: https://amzn.to/3lkLr96(they sell out quick but are back in stock quickly as well)4 Gauge 25 feet red wire: https://amzn.to/2YE7VIyThe conduit shielding: https://amzn.to/3hCbFSg4 Gauge black wire: https://amzn.to/32wdoC7Wire stripper: https://amzn.to/2YFbwpATerminal Lug pack: https://amzn.to/3b1exFQHammer crimp: https://amzn.to/32zW8fEMarine style terminal kit: https://amzn.to/3hx1DSzMarine style terminal fuse mountsSingle Fuse: https://amzn.to/3hxp5idDouble Fuse: https://amzn.to/3lu3Hx560a fuse: https://amzn.to/3aY0l0l80a fuse: https://amzn.to/3llO8XU (get 75a instead if they have it) It is able to charge: Flooded, Gel, AGM, and Lithium batteries using multi-stage charging. This is true of any DC-DC charger, not just Renogy. Luckily, there was an existing ground which Eddie could re-use, right under the tail. yowza. Make sure that the entire system is a 12V system, 2. This multi-stage, multi-input battery charger can charge a service battery from a starting battery linked to an alternator or by utilizing solar panels connected directly to the unit. Haven't observed any overheating issues, but may add a 12v computer fan to help shift some air across the rear just in case. If you have any questions regarding this product, please, 2.65 X 1.38 X 0.55 in (67.3 X 35 X 14 mm), 12V 40A DC to DC On-Board Battery Charger, DCC30S 12V 30A Dual Input DC-DC On-Board Battery Charger with MPPT, 1000W 12V to 230V/240V Pure Sine Wave Inverter With English Standard Socket (with UPS Function), 12V 60A DC to DC On-Board Battery Charger, 3000W 12V Pure Sine Wave Inverter Charger w/ LCD, 12V 200Ah Lithium Iron Phosphate Battery w/ Bluetooth, 12V 100Ah Lithium Iron Phosphate Battery w/ Bluetooth, RBC3050D1S Fuse Installation Instructions, Monitoring Screen for DC-DC MPPT Battery Charger Series manual, Operating Temperature Range : -31F~149F / -35C~65C, Dimensions : 9.6 x 5.7 x 3.0 in / 244 x146 x77 mm, Communication Port:RJ45 (RS485 Protocol), Operating Temperature Range: -4F~113F / -20C~45C, Dimension: 2.76 x 4.33 x 1.25 inch / 70 x 110 x 31.8 mm. We had several days of heavy cloud cover, mist and steady rain while staying at Hartman Rocks near Gunnison, CO. Disconnect the two wiring harness connectors under the driver seat, one is white and one is yellow. SO, I cut an existing wire (green / white shown below), which powers the passenger side front yellow marker light (which now also has 1 of 4 observation cameras on it as well). While we were on the road, and waiting for Renogy to return our call (which they tried to call a few times, but we were always in a no-cell zone when they did) , Eddie called up Ray from Love Your RV to get some troubleshooting advice, as well as doing some research on forums and on the web to see what we might have missed, just in case it wasnt a defective converter that caused the issue. My connections were not up to Eddie standards, but, the connections are solid, and I was able to cover all my mistakes up with heat shrink tubing, so hopefully Eddie wont laugh too hard at me next time he sees my work. Step 7: mount the breaker to the Truck compartment, and pull the new #4 wire for connection to the breaker. B2B chargers are hands down the best way to charge if you drive regularly IMO. Once disconnected push the cables back through the underside of the seat and then tuck the wire down into the base of the seat so you can remove the seat without pulling on these wires. The D+ ignition cable can be purchased at the local store or online, it suits both D+ and LC terminals. BTW this mod is working great, when we need it, it really fills up our lithium batteries quickly. step 17 : So now that we knew everything was rewired and working properly, it was time to connect the DC ON wire to a 12 volt source, in our case, some running lights so that when the truck is in tow mode you could send power, if desired, to the DC Charger. Renogy 30A DC2DC Charger with MPPT - DCC30S 12V 30A DC to DC Battery Charger with MPPT; Bluetooth Module for the charger - BT-2 Bluetooth Module for Renogy Products w/ RS485 Port; 500A Battery Monitor - Renogy 500A Battery Monitor with Shunt; 100A Smart Battery Protect - Smart BatteryProtect - Victron Energy (each 100 watt panel can push about 5-6amps of 12 volt power). step 13 : old lucky 13 ! I verified that, even IF the DC Charger has its red DC ON wire connected to power, the unit will NOT turn on, unless it has incoming DC power. This diagram shows the whole connection of the DC-DC On-Board Battery Charger. How to set the charging voltage value of the charger? Renogy DC to DC Battery Charger InstallRenogy 60A DC to DC Battery ChargerCompatible with a multitude of alternator types, this 60A DC to DC Battery Charger . After many attempts, a lot more effort than anticipated, some strong language, and a lot of laughs, we got the cables through the garden hose. For additional safety, it isolates the input from the output preventing incorrect voltage transmission. Thanks. Bluetooth Monitoring Ready! The D+ Ignition cable is capable of identifying whether the generator is started, to prevent over-discharge of the starting battery and protect the generator. Compatible with a multitude of alternator types, the DC-DC battery charger offers correct charging for AGM, Flooded, Gel, and Lithium batteries. This multi-stage, multi-input battery charger can charge a service battery from a starting battery linked to an alternator or by utilizing solar panels connected directly to the unit. Obviously we can change our power consumption habits to adjust to the lack of sun (not using the microwave, not using the electric water kettle etc), but even then, after 3 days with no sun, our batteries start to dip down to low levels. Totally demoralizing after a long 6-7 hour overall project effort. For boats, the DC to DC charger will be plugged into a dockside outlet for use when the boat is in port. Well post some feedback once we use it ! It accepts and regulates a charge from either (or both) your starting battery (alternator) and solar panels, acting as both battery isolator/charger and charge controller. Why do we need Smart DC-DC chargers? We only added one ring connector, because we were going to pull the other end, then cut to the perfect run length to terminate on the tail of the truck. It has multifunctional safety technology including over-voltage protection, over-temperature protection, and reverse polarity protection to make it safer for use. We dont anticipate using this very often (since our Solar is always on), so we wanted to have a way to connect and charge as needed. On the negative, only the two negative marker wires where cut, as well as the negative tiny wire to the TPMS. However, I did find that not supplying the BVS which is required but supplying the ignition detection wire that isnt was odd. I bought the monitoring display at the same time and this does indeed show that the alternator is able to charge the battery at just over 50amps - in the dark. Solar is to be fitted over the next couple of months again we will be getting a renogy kit, well worth the money our last big item will be 3000w 12v inverter to run all our electrical equipment, We are well pleased with all our purchases. Please allow up to 1 to 2 business days for processing and 3 to 5 business days for shipping. The D+ is going to my running lights on my TT after the 7-pin connector. This one took a few more steps to complete after the fact than normal. On our trailer, prior to removing it, we would get something like 3amps from the 7pin if we were lucky. 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