I bought a small dc-dc converter today for a nice price from TRC Electronic s. I think most of their gear comes from China. The stuff from China has worked well for me so I am not a basher. They have an interesting product offering so if you need something then take a look at what they have.
A few hours after I ordered the converter I received a call from Eric at TR C thanking for order and explaining he was my Power Conversion Expert. (I explained that I was expert as well.) A nice touch although we know he was also doing some fishing for some bigger orders. I explained this was a on e up job. I am semi-retired so probably not going to put a dent into their bottom line. I told him I liked products and would always look to TRC firs t.
By now you're probably wondering what I am doing with converter so I will t ell. We engineers are a curious bunch, so here goes.
I am off grid in New Hampshire. I have a Kohler generator that I run when sun isn't performing well. Generator controller sucks battery down in a fe w hours if my inverter isn't providing 120vac to the generator. So generat or relies on shore(inverter) power to keep float charger running. This is typical. I have crappy inverter that pulls 2 amps from my 48v battery bank - Yes, about 2.4kWh each day when ideling along - a large part of my power budget. So I prefer to keep it off when sleeping or at part-time job. DC toDC converter is 48vdc in and 13.5vdc out to keep battery float charged wi thout running crappy inverter.
So if you need a converter then give Eric a call at TRC ELectronics. In th e meantime take a look at their products. AGAIN - I AM NOT AFFILIATED WITH TRC IN ANY WAY OTHER THAN LIKING THEIR PRODUCTS.