New system up and running

[Jejochen]

Hi guys and girls,
It has been a quite fucked up year (see my last post: https://diysolarforum.com/threads/house-burned-down.83098/)
I went quit in that post because i first wanted to have the insurance everything settled, and to not stir kinds of stuff up. I can gladly say the house has been (almost completly) rebuild, and the insurance was very helpfull in it. I'll never complain again when the yearly fee comes in.
(All is good but the accidental nightmares and stuff from the kids/wife etc..., but thats something else)
So, i built a shed 25 m away from the house and did put the new system in:
3 x MP2 5000/48/70, all loads on ACOUT
Cerbo + screen
Lyncx busbar system
Pylontech US5000 16 pieces
Fronius 10 Kw 3phase inverter with 10 kwp solar panels
Waiting on the RS450/200, comes in in a few weeks, for another 10 kw-ish solar panels

gotta say the pylontech batteries are a pleasure to work with. Excellent warranty also, 10 years. No more hassle with diy, and no troubled sleep at night.
Thanks for all the support, and keep it safe,

 

[42OhmsPA]

Welcome back.
Nice install and don't quit attitude.
Glad to hear you are mostly recovered.
PS - I almost needed my blue light blocking glasses opening those photos.

 

[upnorthandpersonal]

pylontech batteries are a pleasure to work with

Just make sure to remember they're 15s and not 16s.

 

[Brucey]

Waiting on the RS450/200, comes in in a few weeks, for another 10 kw-ish solar panels

Welcome back. I guess Victron must be nearly done with their redesign of the rs450s.

 

[Jejochen]

Just make sure to remember they're 15s and not 16s.

Yep, used all the values provided by them to config

 

[Jejochen]

X

 

[Jejochen]

Welcome back. I guess Victron must be nearly done with their redesign of the rs450s.

Will recieve mine this week

 

[Brucey]

Will recieve mine this week

How are you handling the battery fusing this time around? Megafuses in the distributors, anything else?

 

[Jejochen]

How are you handling the battery fusing this time around? Megafuses in the distributors, anything else?

The fuses in the distributors, and the pylontechs have a bms per unit wich can cut off

 

[Brucey]

The fuses in the distributors, and the pylontechs have a bms per unit wich can cut off

Let me play devils advocate here.

There is a school of thought that even an 80V ceramic megafuse is insufficient to interrupt the current available from a lithium ion battery. Now it looks like in this new design there is a megafuse for each battery which is a big improvement over your last one where everything daisychained through one megafuse.

The most recent ABYC regulations require class t fuses for lfp batteries (20,000AIC rating).

So Victron released their class t power in.

If I was tweaking your design I would use two class t power ins (four fuse positions) and then connect each cabinet of four batteries to each class t. Because BMS can fail and when they do its usually failed closed. However it's now a separate building so can sleep soundly either way.

 

[Jejochen]

I

Let me play devils advocate here.

There is a school of thought that even an 80V ceramic megafuse is insufficient to interrupt the current available from a lithium ion battery. Now it looks like in this new design there is a megafuse for each battery which is a big improvement over your last one where everything daisychained through one megafuse.

The most recent ABYC regulations require class t fuses for lfp batteries (20,000AIC rating).

So Victron released their class t power in.

If I was tweaking your design I would use two class t power ins (four fuse positions) and then connect each cabinet of four batteries to each class t. Because BMS can fail and when they do its usually failed closed. However it's now a separate building so can sleep soundly either way.

Ill look into it. The system has been drawn and parts provided by belgiums nr 1 battery company, so if anythings goes south its on them.
Most important for us this time is the seperate building
Ps: my 1st system also had 1 fuse / battery bank

 

[NC_hydro]

Welcome back. I guess Victron must be nearly done with their redesign of the rs450s.

I can't find squat about when we can expect the updated units. I'm gonna need a RS450/200 here in a month or so when things start warming up.

Edit: I just saw on Bimble Solar for the RS450/100 out of stock Current ETA for new orders February 14th. Finally some news!

 

[Jejochen]

I can't find squat about when we can expect the updated units. I'm gonna need a RS450/200 here in a month or so when things start warming up.

Edit: I just saw on Bimble Solar for the RS450/100 out of stock Current ETA for new orders February 14th. Finally some news!

Over here they are on stock everywhere from last week

 

[RV8R]

I

Ill look into it. The system has been drawn and parts provided by belgiums nr 1 battery company, so if anythings goes south its on them.
Most important for us this time is the seperate building
Ps: my 1st system also had 1 fuse / battery bank

Welcome back @Jejochen

There are many “Impressive” Members on The Forum ,,, And IMO You are “One of Them”.

Wishing You Specially a “Very Happy New Year”

All the Best to You & Your Family for 2025.


I want You to know, your thread/story has helped me pay more attention to my own designs & especially DC. You have selflessly “rang the bell” for other members of the forum to review our designs / systems for safety.

25M away in a separate small building .

 

[Brucey]

I

Ill look into it. The system has been drawn and parts provided by belgiums nr 1 battery company, so if anythings goes south its on them.
Most important for us this time is the seperate building
Ps: my 1st system also had 1 fuse / battery bank

I know but then all those fuse outputs then met on the one solitary fuse/weak point. Huge improvement now where you have each fuse terminating on the bus individually.

 

[Brucey]

I can't find squat about when we can expect the updated units. I'm gonna need a RS450/200 here in a month or so when things start warming up.

Edit: I just saw on Bimble Solar for the RS450/100 out of stock Current ETA for new orders February 14th. Finally some news!

Thinking just a second 450/100 for matching twins?

 

[Jejochen]

Welcome back @Jejochen

There are many “Impressive” Members on The Forum ,,, And IMO You are “One of Them”.

Wishing You Specially a “Very Happy New Year”

All the Best to You & Your Family for 2025.


I want You to know, your thread/story has helped me pay more attention to my own designs & especially DC. You have selflessly “rang the bell” for other members of the forum to review our designs / systems for safety.

25M away in a separate small building .

Very nice to hear. If my story helps only one person to avoid such a disaster, it was worth it. Cant recommend it lol

 

[Jejochen]

The rs450/200 is in. Very nice unit

 

[LydMekk]

If I ever need another SCC I would go for the 450/200. Nice unit.

 

[robbob2112]

Congratulations on your physical recovery. I have some good friends that lost their house in the Marshall Colorado fire a few years back. They also just got out with the clothes on their backs and few minutes notice. It took therapy to quiet the nightmares for them and several hundred of their neighbors.

Marshall Fire - Wikipedia

en.wikipedia.org

Glad the new power center is away from the house.

The Mega fuses have to low an AIC in my opinion.

Given where you are at I would use NH01 fuses with the aR speed rating. Maybe the NH02 series for even higher AIC.

I just don't think the solar designers of the LFP battery system have a concept of the amount of current that the combined batteries can push.

I measured just a 12.8v280ah battery and did the math, IF the BMS failed short so just passing current and a likely failure mode, that little battery would push 8000amps. It wouldn't last long but for that short duration everything would be getting way to hot and melting.


Since you have fuses at the Lynx I would probably get the NH series mounts and fuses and put them on the sides of the battery enclosures. So

Battery - short wire - NH fuse - longer wire to the Lynx.

Then keep the mega fuses in the Lynx. A one time expense which protects from a shorted BMS. And probably never blow a fuse or have to replace one, but paranoid me would do it anyways.