• Have you tried out dark mode?! Scroll to the bottom of any page to find a sun or moon icon to turn dark mode on or off!

diy solar

diy solar

Help with this idea, 220 amp alternator, 2 DC to DC chargers…

dimarrco

New Member
Joined
Nov 23, 2020
Messages
27
I have a Chevy Silverado 2500 HD LT. It has a 220 amp alternator. I have a LiTime 40 amp DC to DC charger that I will be using for the a second battery that’s under the hood. I will be running 1/0 wires to it and to the second battery. This seems like a no-brainer.
The 2nd DC the DC charger is going to be the LiTime 12v 40A DC to DC charger with MPPT or just another one of the DC to DC Chargers above might go to a 60 amp. I will be using 2/0 wires that will run from the engine bay back to the end of my truck with Anderson plugs at the end to hook up to an Anderson plug into the trailer/ dc to dc charger for charging battery banks there. and powering some equipment within the trailer. Now does any of this sound feasible or not? It sounds logically that it could work out with that big of an alternator without frying it.
Next question can the DC to DC charger actually be used for DC circuitry within the trailer( i’m thinking don’t do it) If not, I can always use the battery banks of course and I’ll have solar panels on top, 7 to 8 100 W panels.. the reason I asked these questions because I’m just trying to figure out what I can and can’t do but would like to have ability to charge the 2 Lucitti battery banks when solar is down from the alternator while I am driving and pulling the trailer .
Next question should I use the DC DC charger with the MPPT or should I use a 60 amp or 40 amp without the MPPT? The battery boxes from Lucitti do you have MPPT controllers already within them? Yes I know I got a lot going on here.
next question since the secondary battery in the engine bay will be exposed to cold hot fluctuating temperatures. What would be a better battery to use? I was thinking AGM but then ,a deep cell ,but then you can only discharge down to 50% which I’ll be using a winch on this one particular battery, at times that it would be necessary ,just not constantly. But I do want to be able to use the wench as much as possible, in those times of emergency, without burning out the battery or the winch. I know a lot of them have to be used in stages and let them cool down. This battery will also be used for some lighting accessories on the exterior of the truck,if I was off-road or when needed.

Some of this may be overkill, but it can in time save some electrical issues down the road say alternator that type thing find circuitry all that stuff. Yes, I am new to what I am speaking of, although I have worked with electrical components and made my own circuits within many of my vehicles in the past without any issues, I just haven’t used any of these DC/DC chargers and would like to know if any of this is going to be an issue .

 
I use two dc to dc chargers in parallel for 100amps charging from my 220 amp alt in my 2019 2500hd, I charge twin 280ah diy batteries. I only use DLO cable for mobile applications, I have 1/0 charge lines from the accessory battery to the back seat area of my truck.

6C10D768-FBDE-43C7-88F4-552A7FD2DC74.jpeg9EBD235A-5512-4A57-8764-873B26C7663C.jpeg718126EE-089D-4217-B741-89CA8DBFD99E.jpeg00A819D6-9111-48DA-94A9-58EF38938A33.jpeg
57AE8A04-7573-43D3-86E4-E7B885EDAB0B.jpeg
 
Last edited:
It is funny, because I have been looking at a similar truck. Is yours the diesel or gas, I ask because they use different amounts of electricity to operate. Also don't under estimate just how much power is used by running things like air conditioning and radiator fans.

As far as moving power the length of a 24 ft truck, and then further back to the trailer, your best bet is to use an inverter to convert the 12 volt to 120 vac, and then run it to where you need it. This way it is easy to connect the trailer up to power ( just a normal RV electrical plug ) vs dealing with massive wires and connectors.
 
I ran a 2ga DLO from the main buss bars to a lift gate plug in the bed, this can be switched to either the truck alternator charge circuit(I can add another D/C to D/C charger in a RV) or after the D/C to D/C chargers and be part of the trucks 560ah bank.

I have a plug on my commercial cap that runs to a blue sea circuit box that powers lighting, mobile 4 camera DVR, refrigerator, battery charging for work tools and lighting.

The truck has a Victron 12/3000/120 inverter with a line run to the cap for a microwave and plugs for extension cords.

73834318-FAD3-40C1-907C-4615070278EC.jpeg7D3A9166-25C9-4974-894A-8B54C2E59160.jpeg18613487-17BC-4A07-9AD2-73ED95F2ADF7.jpegF6E1781F-14BA-49CD-85A7-9F3D16C45D26.jpeg

0D8297AA-6B80-459D-8AB1-F42441712374.jpegD5B2459B-2D4E-407D-9CE9-1FF3F9FC3162.jpegC0CB7AA7-EC10-46EA-A10A-A83BA283A123.jpeg506660B9-5B39-429D-9105-79AD376CD420.jpeg4A8084C9-EE8E-4DF8-840E-54EF822EC423.jpeg53D7F50A-102F-4CF7-9FF7-283ABC83AD1A.jpeg
 
Last edited:
Is your truck diesel with the second battery, if so keep it simple and power the winch from that. My truck has the snow plow prep and has the 220amp alt to power the plow, if yours is the same it can probably power a decent size winch.

Then if wanting to charge batteries in a rv run a charge line back to the bumper with a decent plug, and from the plug to a d/c to d/c charger as close to the batteries being charged as possible.

The way I set mine up I have another 2400ah I can put in my commercial cap or RV to augment my on board 560ah.

I am setting up four mobile battery boxes that have two 12 volt 304ah batteries in each.

2318384D-85BA-44F9-A6F3-0E0D15927607.jpegD2B9628C-4DB4-4682-AE80-2604B9E607C2.jpeg
 
I'm confused here but yes you can definitely use 2 DC DC converters in parallel and also can have a mppt all charging as long as the battery can handle all the incoming amperage.
 
As far as moving power the length of a 24 ft truck, and then further back to the trailer, your best bet is to use an inverter to convert the 12 volt to 120 vac, and then run it to where you need it. This way it is easy to connect the trailer up to power ( just a normal RV electrical plug ) vs dealing with massive wires and connectors.
I did just that. I needed to be able to charge a 24V system off the truck and rather than add a 24V alternator, I installed an inverter. This gives me backup power if the camper inverter ever went down.

 
That's really heavy wire for that light of amperage. It only has to carry the load of the charge controller, not the full output of the alternator.
The recommended wire gauge (found in the link you provided) is 6 AWG for the 40A.
Nice part about a DC-DC is if there is a little voltage drop on the feed wire, doesn't matter. It will boost the output. That is what a DC-DC does.
 
A little voltage drop, nothing.
A lot of voltage drop, the DC-DC throttles back or shuts off. They have pretty smart programming in them.
It will be interesting to see how to shove 2/0 wire into that DC-DC. I've never seen one that small that can take that large of a wire.
Manufacturer publishes wire size chart in the manual. That should be a pretty good sign that is what size to run.
 
I ran a 2ga DLO from the main buss bars to a lift gate plug in the bed, this can be switched to either the truck alternator charge circuit(I can add another D/C to D/C charger in a RV) or after the D/C to D/C chargers and be part of the trucks 560ah bank.

I have a plug on my commercial cap that runs to a blue sea circuit box that powers lighting, mobile 4 camera DVR, refrigerator, battery charging for work tools and lighting.

The truck has a Victron 12/3000/120 inverter with a line run to the cap for a microwave and plugs for extension cords.

View attachment 275118View attachment 275119View attachment 275120View attachment 275121

View attachment 275127View attachment 275128View attachment 275129View attachment 275130View attachment 275131View attachment 275132
What does DLO stand for?
 
Is your truck diesel with the second battery, if so keep it simple and power the winch from that. My truck has the snow plow prep and has the 220amp alt to power the plow, if yours is the same it can probably power a decent size winch.

Then if wanting to charge batteries in a rv run a charge line back to the bumper with a decent plug, and from the plug to a d/c to d/c charger as close to the batteries being charged as possible.

The way I set mine up I have another 2400ah I can put in my commercial cap or RV to augment my on board 560ah.

I am setting up four mobile battery boxes that have two 12 volt 304ah batteries in each.

View attachment 275162View attachment 275166
That does answer my questions. You have mentioned everything that I planned on doing and about to execute that plan. I’m going to put a DC to DC charger in between the batteries in the engine bay. Then run a charge line/power line to the back of my truck via outlets/plug to a camper then use a DC to DC charger for charging battery banks in the camper.
My truck is a 6.0 gasser w/220 alternator, 2500hd Lt. thank you for the input. I figured it could be done.
 

diy solar

diy solar
Back
Top