Dual Array and MPPT

[rdougy]

Hi all,
Looking at two arrays in my cabin/shed.
1. 6x180w PV in 3s2p going into vic 250/100 MPPT and then to multiplus II and banking into 4/12v/120ah as a 24v/240ah bank.
2. 2x180w PV in series into victron 150/35 and specs as above.
All through Lynx Shunt and Lynx Distributor.

My questions are as fol:
a. Can I add another battery bank say 12v300ah onto the 150/35 array with a 500A shunt into the distributor?
b. Will both arrays need seperate isolators?

 

[sunshine_eggo]

Hi all,
Looking at two arrays in my cabin/shed.
1. 6x180w PV in 3s2p going into vic 250/100 MPPT and then to multiplus II and banking into 4/12v/120ah as a 24v/240ah bank.
2. 2x180w PV in series into victron 150/35 and specs as above.
All through Lynx Shunt and Lynx Distributor.

My questions are as fol:
a. Can I add another battery bank say 12v300ah onto the 150/35 array with a 500A shunt into the distributor?
b. Will both arrays need seperate isolators?

a. No. You are adding another battery in parallel with your existing battery. It should likely be done at the Lynx. You need to follow the best practices per line #6 in my signature.

b. I don't understand this. Each array is already separate as each array is on its own MPPT.

 

[740GLE]

If your first system is 24v, why would you want to add a single 12v battery?

Or would you be adding a 24v 300ah to your existing 24v battery?

 

[sunshine_eggo]

God damn it. How am I missing this detail?

Hell no, you can't parallel a 12V with a 24V. You must completely separate the systems.

Time for bed.

 

[740GLE]

God damn it. How am I missing this details?

Hell no, you can't parallel a 12V with a 24V. You must completely separate the systems.

Time for bed.

Tough to tell if it’s a typo or what.

Half the fun is trying to get in their head to guess what they really meant vs what they type.

 

[robbob2112]

God damn it. How am I missing this detail?

Hell no, you can't parallel a 12V with a 24V. You must completely separate the systems.

Time for bed.

Drink less beer

 

[740GLE]

Drink less beer

Or more, like a constant 4 beer buzz improves your bowling or horseshoes game.

Gotta know when you need a top up!

 

[robbob2112]

That is true, when I was 20 and I would shoot darts I could hit a bullseye everything between the 4th and 6th beer.... but I never could shoot pool no matter how much I drank.

 

[740GLE]

I’m good for sinking two to three balls, then I get over confident and it all goes to shit.

 

[sunshine_eggo]

I've had the same two beers in the fridge for at least 4 weeks. Drinking ain't my problem... Sleep is.

 

[Brett V]

Drink less beer

More beer! This has been eloquently explained in the Buffalo Theory