Thursday, August 30, 2018

Re: [Electric Boats] House battery?

 

Brian,
Yes, there are pros and cons to having a separate battery bank.

There are "regulators" that will take your higher voltage bank and provide you with a 12V output to run "house" stuff.

The good news is that you then have one less battery to worry about, one less charging system, etc...

The bad news is that if your drive battery goes dead, your house is then also dead.
Worse - if you use a lot of house stuff, you would eventually drain your drive battery.

So you have to figure out what works for you.

That having been said - it may also come down to a practicality issue of:   "how big is your house load".
Many of the step-down regulators that I have seen have been relatively small current.

If you're only running a radio and a few (LED?) running and house lights, then using a small regulator to run this stuff off a single big battery would work fine.

If you are planning a BIG load (lots of lights, a 12V blender, your fridge, vacu-flush toilet, bilge pumps, water pumps, GPS, Radar, TV's, etc...) - then you probably want to think about a separate house bank.

Maybe that's the way to look at it...

Just a thought,
John

On Thursday, August 30, 2018, 9:35:26 AM CDT, Daniel Michaels nov32394@yahoo.com [electricboats] <electricboats@yahoogroups.com> wrote:


 

I use 60v for my motor. I use a single 12v stepped down from the 5 12 v batteries in a series to get to 60v. Works great because I do not use the motor bank unless I need it. I have 6 solar panels connected to 6 controllers one to each battery to keep everything in balance. 


On Thu, Aug 30, 2018 at 8:25 AM, kd5crs@gmail.com [electricboats]
<electricboats@yahoogroups.com> wrote:
 

Hello all, first post. I'm in the process of converting an old powerboat to electric drive. The goal is to cruise at low speed around the lake, and basically use it as a RV for family camping. I'm using an e-propulsion Navy 6 electric outboard.

I'm pretty close to deciding that my battery bank for the drive will be 8 Valence U27-12xps which I have access to at a good price. That'll be 2 130 Ah banks at 48v.

My question: should I get a 9th battery just for 12v house loads, or just use a DC/DC from the main battery? I have some pros and cons in my head but I don't know if they are correct or not, so I'll just ask in the open ended way: how do you handle 12v on your higher-than-12v drive system, are you happy with it, would you change it next time?

Thanks,
Brian

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