DC distribution to multiple MPP's
- Thread starter layertone
- Start date
John Frum
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busbars
I can elaborate upon request.
Appreciate if you can, thanks!
John Frum
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Each battery has its own breaker.
The rack has busbars on each side to aggregate the batteries.
The batteries + rack makes the battery subsystem.
The all_in_one devices are similarly aggregated on their own busbars.
Making the all_in_one subsystem.
Then you connect the battery subsystem to the mpp_subsystem with feeder wires.
I can help you size the wires and over current protection if you tell me the details of the batteries and the all_in_ones.
Code:
battery_subassembly {
pos {
|<->battery.1.pos
|<->battery.2.pos
|<->battery.3.pos
|<->battery.4.pos
|<->battery.5.pos
|<->battery.6.pos
|<->1A_fuse<->shunt.pos
|<->class_t_fuse<->inverter_subassembly.pos
}
neg {
|<->battery.1.neg
|<->battery.2.neg
|<->battery.3.neg
|<->battery.4.neg
|<->battery.5.neg
|<->battery.6.neg
|<->shunt<->inverter_subassembly.neg
}
}
inverter_subassembly {
pos {
|
|<->fuse<->mpp.1.pos
|<->fuse<->mpp.2.pos
|<->fuse<->mpp.3.pos
}
neg {
|
|<->mpp.1.neg
|<->mpp.2.neg
|<->mpp.3.neg
}
}SignatureSolarUS
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the EG4 rack with busbars included?
@smoothJoey yes plan is to have all of the inverters to batteries.
@SignatureSolarUS Yes, I ordered the EG4 rack at Signature Solar. Not sure if it's necessary to use the busbars with these new EG4-LL units as they can be paralleled right on the unit itself
@SignatureSolarUS Yes, I ordered the EG4 rack at Signature Solar. Not sure if it's necessary to use the busbars with these new EG4-LL units as they can be paralleled right on the unit itself
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SignatureSolarUS
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That is not for paralleling, that is if you bought 1 battery and wanted to connect 2 units, the daisy-chaining of battery cables will create very uneven resistance
John Frum
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Depending on the current requirements of the all in one units you may want to do 1 to 1 connections.
Then parallel the units only in the ac domain.
I purchased 6x units & the rack
SignatureSolarUS
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then you should be good. there are 4 free terminals on top, use them with your MPP inverters if you can.
"it's so easy there must be something wrong"
Signed up for these units, https://watts247.com/product/lvx604...t-the-2k-range-add-yourself-to-the-watchlist/
John Frum
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6000 ac watts / .85 conversion factor / 48 volts low cutoff = 147.058823529 service amps
147.058823529 service amps / .8 fuse headroom = 183.823529412 fault amps.
The 150 amp continuous max draw of those units makes a 1 to 1 mapping to a battery that can only deliver 100 amps continuous not well matched.
I assume the units will be stacked on the ac side as well.
Knowing how they are to be stacked in the ac domain would fill in the picture a bit but the numbers above should be clear.
Any thoughts on using Square D QO load centers for battery banks & All-in-1 inverters on breakers?
John Frum
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You mean as a busbar?
If yes, no.
John Frum
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By busbar I mean something like this.
www.waytekwire.com
Not that exact one per say but like that.
Blue Sea Systems 1993 PowerBar 1000, 12 5/16 Terminal Studs | Waytek
Blue Sea Systems 1993 PowerBar 1000, 12 5/16" Terminal Studs and 16 Terminal Screws with Cover is in stock and ready to ship. Order today!
www.waytekwire.com
@smoothJoey nice find! This might be the ticket, appreciate you sharing!
It's a bit alien, I'm just starting out. Appreciate your attention to details!
My plan is to start out with 6x EG4-LL in the rack with 2x MPP LVX6048WP & expand to more in the future.
John Frum
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How many MPP units shall we plan for to future proof?
6x of those batteries could service up to 4x of the MPP units.
Good to know! Max parallel out at 6. Open to add more 6x rack units down the road
John Frum
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Please clarify your answer, I'm not sure what you are driving at.
1 Rack unit = 6x EG4-LL
Parallel all-in-1 inverters= LVX6048WP
Photo Credits: https://watts247.com & https://www.signaturesolar.us/
Parallel all-in-1 inverters= LVX6048WP
Photo Credits: https://watts247.com & https://www.signaturesolar.us/
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