NiyiOmoIyunade:
Yup! All Victron MultiPlus & Quattros support these advanced features natively.

You can set precise AC current limits on both AC Mains and AC Gen inputs and dynamically even adjust the limits of one input on the fly from VEConfigure or VictronConnect or GX Device (with a GX device you can even adjust the AC current limit over the internet)

Having set your AC current limit, you can then set PowerAssist boost factors (allows the inverter to borrow power from the DC bus to assist a Gen or Mains supply and prevent it from being overloaded). Thus a 2.5kva Gen may power over 5kva of loads with no stress on the gen - Victron afficionados catchily call this "Small Gen, Big Power"

Once the two above are set, then you still have a Dynamic Current Limiter that allows the inverter to smoothly transfer loads to a Gen AC input so the Gen sees no sudden shocks - this is much like how inverter ACs ramp up power slowly. The inverter absorbs the power difference and passes it to the Gen small small up to the user set limit.

In my case I am taking about a max of 4.5kva from a 5.5kva Diesel Gen - the Gen takes on the loads slowly over like 15minutes and doesn't even realise it is loaded 80% - it just chugs along happily.

The last feature is "Weak AC Input" - if you set this your inverter will take power from the worst of supplies - low frequency, low voltage, poor surge response and still charge the battery successfully but you sacrifice some efficiency as the power factor derates.

These are the features that make a premium product like Victron worth the extra expense - they do easily and reliably what other brands cannot even imagine to begin to do - again this is superior engineering as at today - in the future it may become a normal standard feature of all inverters.

Victron is beast on all fronts, boss. The thing handles kilowatts level accidents like a dog would a rag doll....just today, I saw a 30kva, three phase systems loaded with with a faulty 3phase AirCon module repeatedly have one phase trip off and come back on, instead of tripping the whole system.

The Victron was basically battling a dead short on one of its phase, I think.

It was happening repeatedly with contactors going crazy inside the unit......omo, see as I fly go off the erring AirCon ehn!

NiyiOmoIyunade:
This is an interesting project indeed. Looks like a good use case for an hybrid system - AC coupled till eveningish and DC or mains/genny backup till 10pm

But you need to double check the numbers first of all.

600,000Kva is humongous - perhaps you meant 600Kva or 600,000Va? That is more approachable.

Also think of the space required to mount 1,500 panels of 400w each? Each panel must be at least 2m by 1m - I doubt your average mall has that much surface area to use.

This is no mean undertaking - we are happy to collaborate with you - please do reach out per details on signature.

SuleimanKano:
Good morning Engineers.

I trust everyone is keeping good and staying safe at this moment in time.

It my first time posting here although have been a regular follower of this great thread.

I need technical support on a project we're  trying to design for a client. However, the Professor who happens to be an Electrical engineer is way too busy for us to sit down and make a realistic design for the client.

In view of the above predicament, we're approaching the deadline for submission which happens to be tomorrow.

We're to design a solar back up system for a supermarket cooling system.

Based on our load analysis, 600,000KVA Inverter System is required, so we break it down to  60,000KVA x 10 Inverters.

Regarding solar panel, we decided to utilize 400W x 1500panels = 600,000W

To save cost, the Professor is of the view that we should do away with batteries. Hence, we are to deploy 300KVA transformer and 300KVA Perkins Generator.

However, new ideas are welcome on the best realistic design, installation and maintenance.

Feedback did be appreciated.

I await response.

CC
NiyiOmoIyunade
zeestone99
Ojeysky
kiekie1
JUO
mctfopt

please my one and only appeal is for you to use inverter ACs for this size of project.

@niyi...when the roll is called up yonder, biko i de here too oh.

We have these Panasonic energy storage batteries that just arrived for sale.

Battery Chemistry: Valve Regulated Lead Acid

12V ,105AH @20HR with 34kg net weight

Just 13units remaining (#80K)

N.B: it's for energy storage and not the UPS brother.

Contact me if you are interested.

futurenix:
We have these Panasonic energy storage batteries that just arrived for sale.

12V ,105AH with 34kg net weight

Just 13units remaining

N.B: it's for energy storage and not the UPS brother.

Contact me if you are interested.

More details please, battery chemistry and cost required

Trippledots:


please my one and only appeal is for you to use inverter ACs for this size of project.

@niyi...when the roll is called up yonder, biko i de here too oh.

Indeed, I actually don't know why anyone who knows about both options (especially household) will not prefer inverter AC. Everytime I put on my normal AC (bought before I got to experience the inverter AC) I just wish I could turn the clock

That said I doubt there are central inverter AC which I guess will be appropriate for large supermarkets

Updated. Though it's not your type of chemistry but it's a good battery. Anyone in startimes transmission station can attest to the performance of the UPS model.

ojeysky:


More details please, battery chemistry and cost required

Trippledots:


With all due respect, I don't think you actually needed help with optimizing your 24v system rather you just wanted to get sympathetic cheer in going back to your 12v system. That in itself is not bad but let's not abuse free consultation that is done here.

cheers.

Really, I don't think much thought needs to be put in that even if it appears that way.

I can assure him that when his load requirements increases and it begins to make mockery of the efficiency his darling 12v appears to offer, he will not need convincing to up the system voltage.

In the journey of AE, we need to crawl first before we walk and then run. It is good experience, though not sacrosanct, to go thru 12v system settings so that you'll know the proper comparisons between the different set points.

I still retain some 12v system set up. Lithium chemistry made my adoption of higher system voltages easy since I have to worry less about lead acid balancing and the hassles that come with it. I installed a 24v system barely 6 months ago and when I realized what I'd been missing, I am already accumulating requirements for a 48v system to come online in about 2 months time. Even now the way I look at the 12v systems is the way a husbandman looks at his layers that has reduced egg output: should I just off these layers and fry them chop or make I just sell them or dash them out?

I'm seriously toying with the idea of connecting the two 12v LFP (different brands) in series to get a 24v even though it appears the in-built BMS will not tolerate series connection. The worst that can happen is to lose the BMS, but the cells will still be alive, right? Please what do y'all think?

Oga NiyiOmolyunade few posts ago said he was already giving out items that had been decommissioned and remained redundant. Subsisting on a 48v system now, I believe those redundancies aside from the "endangered lead acid batteries specie" also include inverters and accessories of lower voltages. These are signs of improved standards; these are beautiful stages that everyone here will navigate thru.

ceaser:


...I can assure him that when his load requirements increases and it begins to make mockery of the efficiency his darling 12v appears to offer, he will not need convincing to up the system voltage....

Well said boss.

ojeysky:


Indeed, I actually don't know why anyone who knows about both options (especially household) will not prefer inverter AC. Everytime I put on my normal AC (bought before I got to experience the inverter AC) I just wish I could turn the clock

That said[b] I doubt there are central inverter AC which I guess will be appropriate for large supermarkets[/b]

true...I know cassette inverter ACs are available. Those can be a last option.

WE BUY DEAD/SCRAP BATTERIES!!!

We also buy off scrap/dead batteries from any state to Lagos(T&C applies) .

12v 200a ..... N15,000
12v 150a.......N11,000
12v 100a.......N7,500
2v 500a.......N5,500

If outside Lagos state , send the scrap batteries to your nearby Lagos park & get your payment alert immediately after confirmatory remarks from me with the transport company manager / secretary or driver .


Contact,
Smartcell global services
CALL:: 081-350-31951
WHATSAPP::: https:///2348170385620

Who pays the waybill fare? Location is delta state

kiekie1:
WE BUY DEAD/SCRAP BATTERIES!!!

We also buy off scrap/dead batteries from any state to Lagos(T&C applies) .

12v 200a ..... N15,000
12v 150a.......N11,000
12v 100a.......N7,500
2v 500a.......N5,500

If outside Lagos state , send the scrap batteries to your nearby Lagos park & get your payment alert immediately after confirmatory remarks from me with the transport company manager / secretary or driver .


Contact,
Smartcell global services
CALL:: 081-350-31951
WHATSAPP::: https:///2348170385620

https://www.pv-magazine.com/2020/08/10/jinko-unveils-new-610-w-solar-panels/


610w panels..chhoooi

Meanwhile, trying to advice a pal.
He is torn btw 8 units of 12v 200ah quanta amaron and 8 units 6v 400ah thundervolt agm battery.

The thundervolts are rated @ 20hr, while quanta is @ 10hr. So apparently quanta is better, its just the 2s2p vs 1s1p connection and the better battery we are a lil confused about.
Price wise thundervolt is a lil cheaper

Allem:
Who pays the waybill fare? Location is delta state

Hello, simply contact details below if you've scrap batteries to dispose as advertised.. Thanks

Contact,
Smartcell global services
CALL:: 081-350-31951
WHATSAPP::: https:///2348170385620

12v 32inches LG dc television available, #40,000. Call/WhatsApp us on 08168986461

360w Gpower solar panel available, #45,000. Call/WhatsApp us on 08168986461

MC4 connector still available, #1,000 per pair)male and female). Call/WhatsApp us on 08168986461

earthrealm:
https://www.pv-magazine.com/2020/08/10/jinko-unveils-new-610-w-solar-panels/


610w panels..chhoooi

Meanwhile, trying to advice a pal.
He is torn btw 8 units of 12v 200ah quanta amaron and 8 units 6v 400ah thundervolt agm battery.

The thundervolts are rated @ 20hr, while quanta is @ 10hr. So apparently quanta is better, its just the 2s2p vs 1s1p connection and the better battery we are a lil confused about.
Price wise thundervolt is a lil cheaper

When taken to same terms both battery are same. One is 12V 200AH @ 20A draw while the other is 6V 400AH @ 20A draw. So basically, same avaliable total energy at that current draw - 2.4kWHr

The only diffrenece between them, if the specs are true, will be how they maintain capacity at higher current draw.

mank1234:


When taken to same terms both battery are same. One is 12V 200AH @ 20A draw while the other is 6V 400AH @ 20A draw. So basically, same avaliable total energy at that current draw - 2.4kWHr

The only diffrenece between them, if the specs are true, will be how they maintain capacity at higher current draw.

Hmm...I think total should be more than that @48v would be about 19kwh and if 50% ceiling is applied, total available would be half of that. Nevertheless both configuration are same capacity wise but I guess durability would not come in in terms of brand

ojeysky:


Hmm...I think total should be more than that @48v would be about 19kwh and if 50% ceiling is applied, total available would be half of that. Nevertheless both configuration are same capacity wise but I guess durability would not come in in terms of brand

Yeah. I should have added capacity from one battery.

justcallmenuel:
360w Gpower solar panel available, #45,000. Call/WhatsApp us on 08168986461

A very simple calculation based on the nameplate data reveals that the panel is actually 320w instead of the 360w written on it.

From the nameplate:

The surface area of the panel is 1.956m x 0.992m = 1.940352m2

The panel efficiency is 16.5%

Irradiance standard test condition is 1000w/m2

From these data, we can calculate the true capacity of the panel.
capacity (w) = area x efficiency x irradiance /100
capacity = 1.940352 x 16.5 x 1000 /100=320w

So, this is clearly a 320w panel being sold as 360w

earthrealm:


Meanwhile, trying to advice a pal.
He is torn btw 8 units of 12v 200ah quanta amaron and 8 units 6v 400ah thundervolt agm battery.

The thundervolts are rated @ 20hr, while quanta is @ 10hr. So apparently quanta is better, its just the 2s2p vs 1s1p connection and the better battery we are a lil confused about.
Price wise thundervolt is a lil cheaper

Both configurations have about 19,200Wh of stored energy.

Please advice your pal to spend a little more money and buy Lithium battery of about 12,000wh (60% of the AGM capacity). He will get more usable energy, it will perform much better and also outlive the AGMs.

I think there's a typo error on the efficiency, it's supposed to be 18.5%.

I can count 6 cells on the width and 11 on the length not including the one not visible so its obviously a 72 cell of 5W each

Moreover, I am not sure there is a 320W with that lower efficiency considering the panel size and Irradiance while calculating.

Most 280W panels have above 16.5% not to mention a 320W then the 360W.

dapsyra:


A very simple calculation based on the nameplate data reveals that the panel is actually 320w instead of the 360w written on it.

From the nameplate:

The surface area of the panel is 1.956m x 0.992m = 1.940352m2

The panel efficiency is 16.5%

Irradiance standard test condition is 1000w/m2

From these data, we can calculate the true capacity of the panel.
capacity (w) = area x efficiency x irradiance /100
capacity = 1.940352 x 16.5 x 1000 /100=320w

So, this is clearly a 320w panel being sold as 360w

futurenix:
Updated. Though it's not your type of chemistry but it's a good battery. Anyone in startimes transmission station can attest to the performance of the UPS model.

I have people that still prefer the lead acids o, infact they are much more and I don't think that will change anytime soon
I missed your contact info

ceaser:


Really, I don't think much thought needs to be put in that even if it appears that way.

I can assure him that when his load requirements increases and it begins to make mockery of the efficiency his darling 12v appears to offer, he will not need convincing to up the system voltage.

In the journey of AE, we need to crawl first before we walk and then run. It is good experience, though not sacrosanct, to go thru 12v system settings so that you'll know the proper comparisons between the different set points.

I still retain some 12v system set up. Lithium chemistry made my adoption of higher system voltages easy since I have to worry less about lead acid balancing and the hassles that come with it. I installed a 24v system barely 6 months ago and when I realized what I'd been missing, I am already accumulating requirements for a 48v system to come online in about 2 months time. Even now the way I look at the 12v systems is the way a husbandman looks at his layers that has reduced egg output: should I just off these layers and fry them chop or make I just sell them or dash them out?

I'm seriously toying with the idea of connecting the two 12v LFP (different brands) in series to get a 24v even though it appears the in-built BMS will not tolerate series connection. The worst that can happen is to lose the BMS, but the cells will still be alive, right? Please what do y'all think?

Oga NiyiOmolyunade few posts ago said he was already giving out items that had been decommissioned and remained redundant. Subsisting on a 48v system now, I believe those redundancies aside from the "endangered lead acid batteries specie" also include inverters and accessories of lower voltages. These are signs of improved standards; these are beautiful stages that everyone here will navigate thru.

Do you mind elaborating on highlighted section? I remember in one of my previous posts I mentioned that there may be more run time on 48v systems and 24v system with same capacity and load, will be good to hear your experience.

Yea, and as long as there are still lead acid with good performance, it's still going to be some users preferred choice. Someone I was introducing LFP to even gave me the popular quote " the devil u know is better than the angel you don't know". See my digits

.

s

ojeysky:


I have people that still prefer the lead acids o, infact they are much more and I don't think that will change anytime soon
I missed your contact info

dapsyra:


Both configurations have about 19,200Wh of stored energy.

Please advice your pal to spend a little more money and buy Lithium battery of about 12,000wh (60% of the AGM capacity). He will get more usable energy, it will perform much better and also outlive the AGMs.

ojeysky , mank

The change to Lipo4, may not work, as users budget was only four batteries, it was a battle to get him to agree to 8 batts.
2ndly, am not sure his inverter supports Lithuim charging.

The 6v 400ah thundervolts rated @20hr is part of my concern, cos when you change the rating to @10hrs as compared to the 12v 200ah quanta batt rating they may actually turn out to be 350ah

3rdly, the 4s2p connection of the quantas vs the 8s1p of the thundervolts, i prefer the single series connection of the thundervolts, just wondering how to connect HA02 balancers to them in 8s1p

Lastly, what is the likely avg price of the lithuims you mention?.are they readily available in country now?

Seems there has been an upgrade to the ha02, ha12, shows the actual battery voltages via a phone app!
Magnificient, the major challenge i had with ha02 was seeing what was going on/knowing if it was working or not

futurenix:
I think there's a typo error on the efficiency, it's supposed to be 18.5%.

I can count 6 cells on the width and 11 on the length not including the one not visible so its obviously a 72 cell of 5W each

Moreover, I am not sure there is a 320W with that lower efficiency considering the panel size and Irradiance while calculating.

Most 280W panels have above 16.5% not to mention a 320W then the 360W.

Are you suggesting that the manufacturer of the panel does not know the correct efficiency wafers they used?

Or

The forger of the nameplate copied wrong data from somewhere else?

It maybe forged that I can't disagree and we still cannot neglect the fact that some factories don't take QC seriously.

However ,even at the 320W that u suggested it can't be 16.5%.

Let the seller contact his supplier and confirm where the issue is if it's not forged except he does not care to know why.

dapsyra:


Are you suggesting that the manufacturer of the panel does not know the correct efficiency wafers they used?

Or

The forger of the nameplate copied wrong data from somewhere else?

DISCOUNTED PRICE!!!

Genus Heiwa 1625VA/12V Inverter (LED)
Output load : 1400VA, Peak Efficiency: >73%, Charger 15A +/- 1A, Tech: ASIC Technology , Dimension: (398*260*152)mm. Wave form: Pure Sine Wave.
Price: 85,000

- Genus 950va 12v ....... 50,000
- Genus 1675va 24v ..... 82,000
- Genus 2050va 24v ..... 87,000

Contact,
Smartcell global services
CALL:: 081-350-31951
WHATSAPP::: https:///2348170385620

SmartcellNuggets : Once you got a solar panel on a roof, energy is free. Once we convert our entire electricity grid to green and renewable energy, cost of living goes down.

Kindly reach out for our available stock at best discounted price!

* JINKO PANELS (370w & 390w mono)

* Canadian solar panels

* Era solar panels

* JA solar panels

* SCHNEIDER Inverter (1.5Kva, 2.5Kva, 4kva, 8.5kva)

* VICTRON Energy Inverter (3Kva, 10kva, 15Kva)

* MPPT Charge controller
( TBB, SCHNEIDER & VICTRON)

* PHOCOS 5000 Watts Hybrid inverter


* SMA SOLAR
(SI 6.0H, 8.0H, SunyBoy 5.0)

* TROJAN Battery (USA)
( 6V 315Ah AGM, 12V 170Ah Flooded, 12V 205Ah AGM)

*Quanta battery (India)
(12V 150Ah, 12V 200Ah)
e.g white carton quanta 200a ... 147,000.
Brown carton 200a ..... 140,000

* HOPPECKE Battery (German)
( 2V, 1500Ah)

* Deka 210a battery (USA)

* SHOTO Battery
(2V, 1000Ah)

* Solar pv cables ( 6mm, 10mm & 16mm size)

INSTALLATION ACCESSORIES such as Aluminium Rail (4.2m), Middle clamp, L- foot, End clamp, Earthing Kit & Lug, Rail splice/Joiner, Adjustable Tilt kit etc with full stock on ground , available for order at best discounted prices.

Contact,
Smartcell global services
CALL:: 081-350-31951
WHATSAPP::: https:///2348170385620

SmartcellNuggets : Once you got a solar panel on a roof, energy is free. Once we convert our entire electricity grid to green and renewable energy, cost of living goes down.

So I got 5units of these fushiai desktop and standing fans for my use, other DIY needs came up and want to sell 2units(one desktop and 1 standing) from them. Anyone interested should contact me. They are still brand-new 40k firm


[img]
https://www.youtube.com/watch?v=SL9gFXIJRak[/img]