In reading through the manual in prearation before delivery of the gear was alarmed when I read this,
“The AC input must be protected by a fuse or magnetic circuit breaker rated at 32 A (for 3 kVA model), 50 A (for 5 kVA
model) and 100 A (for 8 kVA and 10 kVA model) or less, and the cable cross-section must be sized accordingly.
If the input AC supply is rated at a lower value, the fuse or magnetic circuit breaker should be downsized accordingly.”
When I was interested in the the vicron stable I contacted Vicrton with what I wanted to replace who contacted a supplier whor recommneded the Multiplus 11 and MPPT. I studied the data sheet and 29A was rated as the output current and 27A when charging, similar to my previous inverter so with 32A supply already set up thought I was good to go.
The last sentence in the quoted paragraph gives me some confidence I am ok but why the very high100A rating that is as much as the main supply fuse.
I noted from a previous topic that one can set a limit on the input current in EV config something for me to explore further
The other thing I do not understand is the power assist on Output 1 @129A?
Ai gave me this answer.
For example, if a system has an AC input limit of 15A and a load requires more power, PowerAssist will reduce charging and then use battery power to make up the difference, even reducing the incoming watts from the source if necessary to manage the total power flow.
But I am not that much wiser
Dafydd
Thanks for the link. I have signed up for that. Loads of very useful stuff in there. I have not come across any other manufacturing support on anything like what Victron have got. “Pig in the proverbial.”
And to add on, unless the circuit feeding the inverter is rated less than the 100A it is capable of passing through.
For example my main house feed is 60A so 100A for the system is way too high.
On some houses the incoming is only 32A and so adjusted wiring size and breaker (as well as inverter settings) is necessary.
Thank for the above replies. I have an 100 amp supply to the premises but the cables to the inverter are designed around 32 A a legacy from the previous install. The capability of the inverter to deal with the 100 A explains why it is so heavy!
Been getting my head around the various comms cables, and the schematic of connecting the MPPT 450/100 to the Cerbo has a choice of using either VE can or VE direct. The one difference I can see is that the VE can needs a terminator at both ends whilst the direct is slimmer. Is there a preference.
I dont have one unless you are considering cost or expansion.
Can is useful if you have a bunch and you want to daisy chain them. The terminators come with the GX so that is covered either way.
Ve direct is nice and solid comms too.
An RJ45 cable is cheap and available in various/custom lengths. The connector also sits well in the socket where vedirect is much smaller and more likely to unseat if bumped.
From an ease of install/use/reliability I would take CAN any day.
On some USA Videos they power the LED’s on the Lynk distributor with device that takes the voltage from the battery terminals and reduces the voltage to suit the LED’s. Not seen anything like that here. So what is the solution used in UK.
A lot of solar setups I have seen include fusing of the solar inputs before going into an inverter/MPPT and that would be each string being individually fused with 2 fuses i.e + and - .
Not seen any mention of these on the Victron schematics. What is the take in the community on this?
My current AC supply set up for the previous inverter has the supply coming from the house CU on a 32 amp breaker but not on a RCD as was told not to have the inverter so protected. The supply also has its own inverter isolator. The Multiplus 11 requires an RCD so for convenience will fit an RCBO.
The solar gear is in an outhouse some 15m away and the previous inverter had built in isolation switches for both DC and AC. I have isolation DC on the panels some 70M away so for convenience will fit a DC isolator prior to the MPPT. The question is, do I fit an isolator on the AC before going into the inverter?
The incoming is a 4 core cable so 2 conductors will be the feed and 2 will be Out 1 for the critical loads. I was thinking on the lines of a 4 pole isolator but I am unsure about including in the switching the out 1 conductors. I can see positives and negatives in that approach.
These are usually modifications (plenty DIY ones to look up and ot, there are some ‘professionally’ offreed ones) as the lunx shunt provides power and and comms connection to the GX.
Local regulations.
I fuse right by the panels (and have a disconnec there if i think it is necessary). There is always a dc disconnect right by the MPPT/installation. Sometimes second fusing. Again it depends on the installation.
I did not fuse the PV strings in the original set up but I will now, and have will 2 isolators one at the array and one before the MPPT as had previously.
I did not fuse the PV strings in the original set up but I will now, and have will 2 isolators one at the array and one before the MPPT as had previously.
I cannot find any volt reducing semiconductor components to make a power source for the Lynx LED s. There was a link on one of the American videos to amazon but they were all bulky devices which would not fit in the distributor. I could make one that sits outside the device but not very neat. Looked on Radio spares could not find a slim component on there either.
I am not at all pleased with the supplier of the gear. Was meant to have been despatched on 22nd December but it was not. Not replying to my queries either. Took my money though.
Raring to go now as have got all the bits to put it all together. Will have another look at positioning the Lynx distributor as having bought cable I am pleasantly surprised how flexible it is.
The Lynx Distributor can monitor your fuses. Usually it gets connected via RJ11 plug to a Lynx BMS. It transfers fuse status via I2C bus to Venus OS and generates an alarm when a fuses is blown.
Check out this open-source project which integrates the Distributor directly into Venus os.
Have another couple of queries.
The gear has now turned up "unannounced” so can move on with the install.
Reading through some stuff I came across a mismatch between VE and BMZ around the float voltage. I found an EV document just on the connecting of the BMZ battery to the EV system and it states to set float voltage to 60.0V. The BMZ documents state the float voltage is 52.5 volts. I do not think they can both be wrong so wondering if they are quoted in different contexts.
Been wondering how best to run the cabling. I thought that running the “energy” cables in trunking was not recommended but I saw a professional build on you tube where it was all in trunking apart from the emergence of the battery cables from the Lynx distributor to the battery. The other thought is a cable tray but that does not look as neat. Any views.
Will have a challenge installing the Multiplus its 42 kg and top heavy.
