larman
Senior Member
- Joined
- Nov 29, 2017
- Messages
- 232
- Location
- United States
- Vessel Name
- Livin The Dream
- Vessel Make
- Sea Ray
I am thinking of adding a dc to dc charger was curious if it would charge two batteries run in parallel?
Make sure you have an external alternator regulator, so you don't burn up your alternator, which was designed to only recharge a start battery. Don't ask how I know this....The source would be the battery/alternator from the engine. This would help charge the house bank so I can charge them while underway without having to run my generator and ac battery charger.
That’s a valid concern, depending on the batteries you install. But, most internally regulated alternators will not put out rated amps for long.My only concern is the load on the alternator. I have a 100 amp alternator. I am sure it would be working a long while underway to recharge the housebank.
Yes if you only have one battery, if you have 2 then 40A, 3 then 60AI have the stock alternator on my Lehman - 55 amp. I thought I’d buy the victron 30 amp dc to dc charger, but after consulting with Peter Kennedy at PKYS decided to do the 18 amp charger. Turns out the lithium battery I purchased recommends a 20 amp charge rate. I haven’t actually received the battery yet to double check the specs.