3 parallel Lead Acid strings

[Mike90250]

Then, why not opposite ends of the bus bar ...

usually makes complex cable issues, I like more symmetrical cables.

[NEOH]

Will do it as you suggest. My problem is to find the busbar here. Have been calling many electrical supplier AND the very few solar provider, nobody has busbar

Is cadmium-plated solid copper OK ?

example: Something like this ...

https://www.ebay.com/itm/Solid-Coppe...0AAOSwDNdV3eqG

[Sunking]

Can the OP add a DC Rated Fuse in series with each string ?

Yes but it needs more OCPD/ As you noted one OCPD on each battery, but there also needs to be OCPD looking at the CC and Load on the buss feeders.

[dapago]

Does not compute. Busbars are not rated in AH, the are rated in AMPS. The busbar current ratings (Amps) must be equal to or greater than the load imposed on it. If you have at least 1/8 inch thick copper 1 inch wide busbars will exceed anything you can throw at it as it will be rated at least at 200 amps.

FWIW the bus bars are the least of your concerns, or perhaps mine. What I want to know is just how you plan to integrate Over Current Devices using bus bars.

My mistake sorry.

will try to find 200 amps busbar or may have to order them in the US. Was thinking of using earth bar but apparently (true?) I have been told that they are only brass coated (?)

[dapago]

Then, why not opposite ends of the bus bar,
Inverter (+) @ top of bus bar, near string #1's connection
Inverter (-) @ bottom of bus bar, near string #3's connection

Same with CC's

Will do it as you suggest. My problem is to find the busbar here. Have been calling many electrical supplier AND the very few solar provider, nobody has busbar

F169EE73-3AC7-4477-8FB7-7A9159E2481F.jpeg

[NEOH]

Does not compute. Busbars are not rated in AH, the are rated in AMPS. The busbar current ratings (Amps) must be equal to or greater than the load imposed on it. If you have at least 1/8 inch thick copper 1 inch wide busbars will exceed anything you can throw at it as it will be rated at least at 200 amps.

FWIW the bus bars are the least of your concerns, or perhaps mine. What I want to know is just how you plan to integrate Over Current Devices using bus bars.

Can the OP add a DC Rated Fuse in series with each string ?

[NEOH]

I'd size it for 2x the surge rating of your inverter. AND i'd feed it from the center of the bussbar, not the end

if the inverter can draw 250A at surge, i'd size the bussbar to 500a

Then, why not opposite ends of the bus bar,
Inverter (+) @ top of bus bar, near string #1's connection
Inverter (-) @ bottom of bus bar, near string #3's connection

Same with CC's

[Mike90250]

An other question. What Ah is needed for the busbar for my bank?

I'd size it for 2x the surge rating of your inverter. AND i'd feed it from the center of the bussbar, not the end

if the inverter can draw 250A at surge, i'd size the bussbar to 500a

[Sunking]

An other question. What Ah is needed for the busbar for my bank?

Does not compute. Busbars are not rated in AH, the are rated in AMPS. The busbar current ratings (Amps) must be equal to or greater than the load imposed on it. If you have at least 1/8 inch thick copper 1 inch wide busbars will exceed anything you can throw at it as it will be rated at least at 200 amps.

FWIW the bus bars are the least of your concerns, or perhaps mine. What I want to know is just how you plan to integrate Over Current Devices using bus bars.

[Sunking]

Just need to know if that is correct and if each batts will be well balanced.
cant afford to damage my batts or have unbalanced batts.

Yes.

[dapago]

An other question. What Ah is needed for the busbar for my bank?

[dapago]

017B5036-FA62-453B-868C-237A7D24FD8C.jpeg



i have made a little diagram. Just need to know if that is correct and if each batts will be well balanced.
cant afford to damage my batts or have unbalanced batts.

[dapago]

For lead-acid batteries you do NOT want to add the cross connections (dotted lines). The batteries and strings will be better equalized if you do not use them.
For lithium chemistry batteries, which do not tolerate overcharging some batteries in a string to get full charge on others, you would want to use the cross connections.

Thanks a lot for your inputs!!! Really appreciate it.

[Sunking]

So I don

You can connect Pb batteries as show below (Alternative) IF THE CELLS ARE 2 VOLTS. They cannot be 4, 6, 8, 12, 24, or 36 volt Pb batteries which is shown Conventional.

[inetdog]

My answer is not showing On my iPad
will open a new message.
i was asking that if the dot lines are not necessary, will the bank be well balanced?
if not, can we use method 4 and if so what will be the diagram?
sorry to bother you again

For lead-acid batteries you do NOT want to add the cross connections (dotted lines). The batteries and strings will be better equalized if you do not use them.
For lithium chemistry batteries, which do not tolerate overcharging some batteries in a string to get full charge on others, you would want to use the cross connections.