Roadtrek RV 12V >1,000 ah

[Willy T]

Whatcha wanna bet a card carrying Green Mafia Marketer with long hair in a pony tail, beard, over 60, and smoking Whacky Tobacky? Betcha it was Willy

Is this a Solar Forum or the Comedy Club ?? I had feeling when Solar Pete said he was going to create the section it'd just be another place where you could come and bash and trash posters.

[inetdog]

Is this a Solar Forum or the Comedy Club ??

Yes.

[Mike90250]

Roadtrek RV 12V >1,000 ah

moving posts to this thread

[Sundetective]

I think the bigger question is the four parallel strings of two six volt batteries each, assuming that this a 12V system.
Now if it is 48V, then we have a different animal.

4 in parallel isn't nothin.

If old Bill can remember properly a well known fellow from Northern Wisconsin
was running posts about 7 in parallel. I would have to look it up but from memory
it was at least 7. This was in the Fieldlines Forum.

However Mike90250 has mentioned liking some of the man's unique ideas,
Like how to beat the lifecycle clock and get extra life from your batteries.
Not saying that I buys that one.
There is no doubt that da man did the long string for his machine shop.
Barn / machine shop or whatever.
He loved it the last time I looked which is a good while back.

Bill Blake

[Sundetective]

4 in parallel isn't nothin.

If old Bill can remember properly a well known fellow from Northern Wisconsin
was running posts about 7 in parallel. I would have to look it up but from memory
it was at least 7. This was in the Fieldlines Forum.

However Mike90250 has mentioned liking some of the man's unique ideas,
Like how to beat the lifecycle clock and get extra life from your batteries.
Not saying that I buys that one.
There is no doubt that da man did the long string for his machine shop.
Barn / machine shop or whatever.
He loved it the last time I looked which is a good while back.

Bill Blake

Actually a parallel string going 7 Long isn't nothin.

Let's try 24 Rolls 4000 Series Batteries in a 2 X 12 configuration.

A string not 7 Long but 12 Long.
You heard it !
24 batteries.

Being as how it was in September of 2012 I though of something
my old Dad might have said about the first guess from memory.

'Dont Let dat Lie get out'.

So I spent the time and effort to Looks it up - just for SPT.

Bill Blake

[Mike90250]

I'm not saying it can't be done, it can, BUT you need to know how to test the parallel strings, have matched cables, do constant monitoring, proper fusing and put up with the horrific copper losses. As for first-timers starting out that way, it's generally going to not have the best results.

[inetdog]

I'm not saying it can't be done, it can, BUT you need to know how to test the parallel strings, have matched cables, do constant monitoring, proper fusing and put up with the horrific copper losses. As for first-timers starting out that way, it's generally going to not have the best results.

At least the interties between batteries and through the fuses to the bus bars do not have to be the horrendous size wires that will be needed between bus and inverter(s).
And the bus bars will provide a better place to physically mount the mother of all wires than any battery terminal post could be.

[lkruper]

LOL. Yeah I figured that out already. Its the 12 volt 3000 AH batteries (2000 pounds) that make my head explode. That high end of a vehicle could have easily used say 144 volts @ 120 AH LFP or LiMm. Would have been less expensive, 1/5 the battery weight to haul around. 1/4 the space, provided more usable energy, last longer, and a whole lot safer. Just plain ole stupidity. Sounds like a Hippy or Mechanic was the designer.

I got my information from this link: http://www.colonialroadtrek.com/road...s-e-trek/9961/ They call the solar panel a "battery maintenance tool".

You list 144 volt LFP batteries as less expensive than the AGMs. What brand of LFPs do you have in mind?

[Sunking]

Actually a parallel string going 7 Long isn't nothin.

Just because you can does not make it right. Electrical Codes will permit it, but electrical codes are not design guides and do not take performance into consideration. Engineering Practices allow \\ wit under very strict restrictions. A good Example of that is a 48 volt 16,000 AH battery, or 4 parallel strings of 4000 AH batteries. Hanging above it is a 5000 lb custom designed laminated copper buss that is 4" x 8" x 20'.

Another justification for doing two strings where the project is mission critical allowing to take one string off-line.

But here is the catch. Neither system above is a Cycle Application, strictly Emergency Stand By operations. The equipment runs directly off the rectifiers not the batteries. The batteries just sit there and Float waiting for the power to go out. When power goes out depending on design gets you 4 to 16 hours to get power restored or the generators up and running. Not even the USN would parallel batteries in a submarine.

[Sundetective]

Just because you can does not make it right. Electrical Codes will permit it, but electrical codes are not design guides and do not take performance into consideration. Engineering Practices allow \\ wit under very strict restrictions. A good Example of that is a 48 volt 16,000 AH battery, or 4 parallel strings of 4000 AH batteries. Hanging above it is a 5000 lb custom designed laminated copper buss that is 4" x 8" x 20'.

Another justification for doing two strings where the project is mission critical allowing to take one string off-line.

But here is the catch. Neither system above is a Cycle Application, strictly Emergency Stand By operations. The equipment runs directly off the rectifiers not the batteries. The batteries just sit there and Float waiting for the power to go out. When power goes out depending on design gets you 4 to 16 hours to get power restored or the generators up and running. Not even the USN
would parallel batteries in a submarine.

King,

Your singing to the choir on this one.

You no see the smiley faces ??

There seems to be some discrepancy in the
soundness of dat Northern Wisconsin story
however some of it seems to escape you.

Much of the show and tell is absolutely wonderful.
Some seems way off the mark.

If you compare what was said in another forum with
here you couldn't help but notice some of it.
Doesn't bother me any.

Bill Blake