Hello im off grid in no. NEVADA

[bcroe]

What would be the best conductor to build a buss bar from?

Use electrical quality materials, plated is good. Bruce

[Rob775]

If you tie them together just be careful that one battery bank doesn't do all the work. The same goes for the CC's. They need to work together or they will fight each other to maintain the system charge voltage.

Let us know how it works out for you.

Oh, Happy New Year.

Thank you,
Happ new Year!!

[Rob775]

Just a note, copper needs to have very high purity to achieve lowest resistance. Copper pipe
IS NOT guaranteed to achieve this. Bruce Roe

What would be the nest conductor to build a buss bar from?

[bcroe]

The plan is to use copper pipe as a pos and neg buss bars

Just a note, copper needs to have very high purity to achieve lowest resistance. Copper pipe
IS NOT guaranteed to achieve this. Bruce Roe

[SunEagle]

Each charge controler will have 16 6v batteries or 2 48v batteries to maintain.

The plan is to use copper pipe as a pos and neg buss bars for the controllers and inverters to tie together and tie the batteries to the buss bars with equal length wires. This was sugested to me by a tech at Arizona wind and sun (a retail store).

If you tie them together just be careful that one battery bank doesn't do all the work. The same goes for the CC's. They need to work together or they will fight each other to maintain the system charge voltage.

Let us know how it works out for you.

Oh, Happy New Year.

[Rob775]

Each charge controler will have 16 6v batteries or 2 48v batteries to maintain.

The plan is to use copper pipe as a pos and neg buss bars for the controllers and inverters to tie together and tie the batteries to the buss bars with equal length wires. This was sugested to me by a tech at Arizona wind and sun (a retail store).

[Rob775]

I have 2 80 amp charge controlers

I will also have the banks split in 2 for the charge controllers to have a better chance of keeping up with demands of charging.

[SunEagle]

Curious....
How do i figure out the proper charge rate for the batteries?

The charge rate for Pb type batteries are usually between C/12 and C/8 where C = Ah rating of your system.

For a 900Ah battery system you need to get your charging amps between 75A and 112.5amps. I usually focus on a C/10 charge rate which would be 90amps but unfortunately that is more then a typical CC that has a maximum rating of 80Amps.

If you get lower than a C/12 rate you run the risk of getting the battery plates sulfated which causes them to die.

[Rob775]

Curious....
How do i figure out the proper charge rate for the batteries?

[Rob775]

Thank you once again SunEagle.
This now makes sense.

[SunEagle]

225 ah 6v x 8 = 48 v 225 ah bank

x 4 banks = 900 ah

900 ah x 48v = 43,200 watt hours

43,200 wh = 1000 wh load 43.hours

Did i learn this correctly ?

Yep. The only thing you may have wrong is the number of wh load for 43 hours. Most Pb battery systems can be safely discharged 20% to 25% each day or you end up shortening their life and reduce the number of allowed cycles.

To be safe I would say your bank can deliver 43,200 wh x 25% or 10800wh which comes to a load of 450 watt for 24 hours. Of course less time allows for a bigger load.

[Rob775]

225 ah 6v x 8 = 48 v 225 ah bank

x 4 banks = 900 ah

900 ah x 48v = 43,200 watt hours

43,200 wh = 1000 wh load 43.hours

Did i learn this correctly ?

[Rob775]

Ok so these are the specs.on the batteries I have now

[SunEagle]

The mathematics of the batteries is my weakest area of understanding how they add up and work

Well I made a mistake by telling you how many 6V batteries you need for a 48V system. When I said 20 x 6V batteries wired as 5 parallel strings of 4 would get you a 48V system. it would really only be a 24V system. You have determined the correct number of 6V as being 24 which wired in 3 parallel strings of 8 will get you a 48V system.

For future reference, when you wire batteries in series you add up the voltage but the Ah is the same as one, when you wire batteries in parallel you add up the Ah rating but the voltage is the same.

As for a 3 year old 48V battery, I would be cautious about getting even half their rated life cycles but if they are cheap then they might be worth it.

[Rob775]

Mike90250
Thank you. That was a good read. Im going to have a another look at how mine are connected.
the load and charger wires are connected same place.