Sterling 24v DC-to-DC in Series + Parallel for 48v Battery Bank

[Josephclimber]

I have one 270amp/28v alternator and 4 Sterling 24v/35amp DC to DC.
I'm planning to have a 48v lithium battery bank.

Question: Can I connect the Sterling DC to DC in series PLUS parallel to get 48v/70amp to safely charge the 48v battery bank?

 

[Crowz]

I would say no since a dc to dc charger is designed to put out a fixed voltage on the output side.

So if it gets 12v in it will put out 12v.

If it gets 24v in it will put out 24v. Its never going up by putting it in series. It will just keep putting out 24v.

They make a 24v to 48v unit but its not an in series thing.

 

[justinm001]

What alternator is it? Sounds like mine a 50dn as it's the same 270a.

I used victrons 24-48 8.5a dc to dc converters. You can parallel them together. I have 4 of them plus 2 24-12v 70. I have a thread on here as I'm just finishing the setup.

 

[Josephclimber]

I would say no since a dc to dc charger is designed to put out a fixed voltage on the output side.

So if it gets 12v in it will put out 12v.

If it gets 24v in it will put out 24v. Its never going up by putting it in series. It will just keep putting out 24v.

They make a 24v to 48v unit but its not an in series thing.

Thanks Crowz.
I was looking for some of those options 24v to 48v but they all have very limited output OR they are extremely expensive.

I was trying to see if I could use the 48v battery bank instead of 24v.

 

[Josephclimber]

What alternator is it? Sounds like mine a 50dn as it's the same 270a.

I used victrons 24-48 8.5a dc to dc converters. You can parallel them together. I have 4 of them plus 2 24-12v 70. I have a thread on here as I'm just finishing the setup.

Yeah I have the DN50 270A/28v one too!
I have at least 140amps to spare since I removed a ton of loads including the original air conditioner.

I was looking for a solutions that would allow me to use close to 120-140amps from the alternator to charge the house battery bank, which can be 24v or 48v (I still don't have them). I would prefer to get a 48v battery system but I can live with a 24v system too.
Just trying to get the best out of everything I can.

I already have the 4 Sterling 24v/35amp DC to DC.

Ps. Your system sounds insane dude!!!

 

[justinm001]

Thanks Crowz.
I was looking for some of those options 24v to 48v but they all have very limited output OR they are extremely expensive.

I was trying to see if I could use the 48v battery bank instead of 24v.

Like $200 for 400w. I bought 4 of them in parallel work great just gotta get the alt setup.

Victron Energy Orion-Tr IP43 24/48-Volt 8.5 amp 400-Watt Isolated DC-DC Converter https://a.co/d/4qQAUtZ

 

[justinm001]

Yeah I have the DN50 270A/28v one too!
I have at least 140amps to spare since I removed a ton of loads including the original air conditioner.

I was looking for a solutions that would allow me to use close to 120-140amps from the alternator to charge the house battery bank, which can be 24v or 48v (I still don't have them). I would prefer to get a 48v battery system but I can live with a 24v system too.
Just trying to get the best out of everything I can.

I already have the 4 Sterling 24v/35amp DC to DC.

Ps. Your system sounds insane dude!!!

I'd still go with 6 or so of those victron adapters. $1200ish. Other option is 48v balmar which is like 3 grand then some wakespeed or other to run it.

Depending on your inverter size 24v might be a good option. I love the 48v and using smaller cables but could be in your favor to just stick to 24v.

Yeah my system is a bit insane. Wanted full redundant system