Guests - If You want access to member only forums on HSO. You will gain access only when you sign-in or Sign-Up on HotSpotOutdoors.

It's easy - LOOK UPPER right menu.

Sign in to follow this  
Followers 0
Guest

Wiring 12V Parallel

7 posts in this topic

Hey All-
Great board you have going here!! Maybe someone out there can offer some advice. I'm wiring up a 12V 55# MinnKota this weekend on our boat. I purchased two new Trojan Batts, and plan on running them in parallel to remain at 12V but add some run time. My question is about the on-board charger. We're running a 2 bank, 10 amp model from BPS. What is the most logical way to hook it up to my setup?? We're currently running one bank to the TM batt and the other to the starting batt. Can I hook up both banks to the TM batts in parallel without disconnecting the jumpers between them?? I assume that by hooking one bank up to a TM batt, it will "see" the parallel batts as one big 12V, but may take a long time to recharge both at 5amps??

Opinions/suggestions please!!

Thanks

chico

Share this post


Link to post
Share on other sites

You will need to disconnect the jumper between the batteries. You could leave it on when you charge but that is only if your batteries discharge at the same rate, if they don't then on will be overcharged prior to the second coming to full charge. You might want to put a QD between the batteries, use the charger on the two trollers. And buy a 11/2amp for the starting batt.

Rob

Share this post


Link to post
Share on other sites

Like Rob said with ac chargers they will not charge the batteries correctly more then one battery at a time. you should wire both banks to trolling motor. do you really need to charge running battery?

------------------
JIM PAYNE

Share this post


Link to post
Share on other sites

Batteries can be viewed as buckets of water. If you have two buckets of water tied together, the may discharge at different rates. But you can charge them in parallel, because the lower battery or bucket will fill until matches the level of the other. After they have leveled off they charge at the same rate until completed.

Share this post


Link to post
Share on other sites

I currently use 2 12V batteries for my trolling motor setup and I use a single 2amp auto charger connected to one of the batteries. It takes about 24 to 30 hours to get to full charge. I would think that a 5 amp should drop this time substantially and how often are your batteries going to be fully discharged?

Do you really need to charge them faster than 15 to 20 hours??

Grabs is right about the water thing......both batteries will discharge and charge at the same rate. Because they are connected, if one discharges a little faster, the other will put energy back into it until they are at equal charge. They will always, by definition, have the same measured amp draw when connected in parallel.

Share this post


Link to post
Share on other sites

Ok guys-
I'm going to try running one bank thru the TM batts. The charger is supposed to have full power transfer- meaning it will put the amps to the batt that is less charged. If the engine batt is full, it will maintain it, but turn the rest of the power to the less-charged one: more than likely the TM's. Hopefully it works as advertised! The time thing really only becomes a factor when we're fishing somewhere for all week. I would think that 8 hours of charge time should be OK with 10 amps total- most of which will be going to the TM batts. Would it be wise to charge thru the end batt of the parallel or the one the TM is hooked to?

Sorry for all the questions guys- just want my investment to last a little while, you know?

Thanks again for your time...

chico

Share this post


Link to post
Share on other sites

It makes no difference which of the two batteries you connect the charger to. Pick the one that is most convenient.

Share this post


Link to post
Share on other sites
Guest
This topic is now closed to further replies.
Sign in to follow this  
Followers 0



  • Posts

    • jobs and better paying jobs.   that's about it for me.  Sure there are some perks, but I'd give it up in a second if I could come close to matching my income in Grand Rapids. What sort of field are you in?   Anymore it's all indeed, monster, or some sort of online service.  Maybe a recruiter can place you in something, but it might be a sucky job.  I went to a recruiter a few years ago and they could put me a job in a few days, but it was sort of on the edge of my field and the job sucked.  Still, if I was in a pinch, I'd do that in a heartbeat over sacking groceries.   Nobody reads the newspaper and C-list is for sex work and scams.
    • Thanks for the advice, we do know the areas that we like have liked in the past. Cities is a vague reference as most people up here call everywhere down there the cities. We would be looking at the west metro area or nw suburb area.   Job on is the big thing right now ideally my wife could take a few years off to raise our boys as typically the "cities" pay is more than up here.. I have been looking but what is the best way? Indeed? Newspaper? Clist?   We we are a good distance in a way but we are close to our families. When we get company we get them for 3 solid days. Also once we had our twins it was more so they could see there cousins, aunts, uncles, and grandparents more often than 1-2 times a year.
    • The gdp is right around 18 Trillion Dollars.   Ten years of that, including even a little nominal growth is north of $200 Trillion.   So you are talking about 4.5% over ten years.     And that is assuming that these economists are able to forecast accurately.   We had other economists telling us about the "multiplier" where a dollar of government spending increased GDP by way more than a dollar.     I didn't believe them either.   
    • I put a few miles on this weekend as well. Out on the lake and back a few times. But, I was about a mile out!
    • Those people always try to block the launch when they see me pull up
  • Our Sponsors