Greatwhite

Item Wanted: BSL 6.4kWh Batteries 1 or 2 off Packaging Essential: Not required in collecting in GP, but if delivering, shipping protection would be required Desired Age: less than 4 years, battery usage stats to be provided Location: Kempton Park Willing to accept a shipped item: Yes, Details to be discussed Ballpark/Budget Amount: Fair market Price subject to usage stats

I know on a parallel setup the aux input cannot be used on one inverter only. Is there a reason you can't put the generator onto both? And limit each to take off half the capacity of the genset?

Could you elaborate?

That was what I believed to be the case, thank you. Was hoping someone might have some real world experience in this regard and could comment also

Have a look at this thread:

No one tried this?

Can a smallish invertor generator be used with a Sunsynk Invertor? On one of the Sunsynk youtube vids they talk about generator application/integration and suggest a generator with double the rating of the inverter. Reason given is frequency variation as a result of load variation which makes sense. Since 'stashing' a 'little' 16kw genset in my yard is not feasible both from a financial or space/location point of view and since my average day time and evening power use is probably not more than 2kw, for which a 16kw would be grossly oversized and inefficient and since, as I understand it, an inverter generator doesn't suffer frequency issues, could say a 4kw unit be used - limiting the generator input to say 3kw? Having answered that, when load is lower than the envisaged 3kw can the excess be sent to charge the batteries? i.e. keep load constant and a reasonably high but sustainable % of max genset power so that efficiency is decent. And having answered that, could the same logic be applied to 2 Sunsynk inverters running in parallel? i.e. set a limit of say 1.5kw (half 3kw above) on each inverters and share the input from the genset. (The Sunsynk training vids make it clear you can't use the generator input on one inverter only when you have paralleled units)

Removed - I misread the question

I agree with @___ There isn't really enough capacity even in newer PoE stds for powering household requirements. Not something I would want to be pioneering with but someone has to be brave and and give it a go. That is not to say it doesn't have its place though with low power devises like LED lighting. @mmacleod I assume you are looking to use all the 'smart' features/power management? Otherwise it seems a very big investment to make for little return? FWIW, I used a TPLink splitter to pull power off my PoE NVR to power some Infrared illuminators (basically 10w flood lights operating in the infrared range of my cameras). Activated by a day/night sensor. Parts all bought on takealot except the illuminators that I got from Communica (were supposedly in stock, but ended up having to wait for them to import more stock). Hardly the scale you are looking for but it works and splitters are the older 802.3af std

I have to ask another question: where did the 450v value come from? Per the link I posted MPPT limit is 425v and max DC is 500v. @WannabeSolarSparky posted the current rating per MMPT has been raised to 13A (have you got a published datasheet for that?), on that basis, has the MPPT voltage been raised too and do you have this current/latest firmware? (don't assume your new unit has the latest firmware) I personally would not take a chance on current - why publish a max value if you can exceed it? At least contact the chaps and Sunsynk before you make an expensive mistake. Bear in mind current is often limited by the size of the contacts. conductors, etc i.e. hardware.

The voltage it per MPPT. However, I think I see a problem - If I am not mistaken, your peak current on your MPPTs for the 5kW Sunsynk is 11A (https://www.sunsynk.org/5kw-hybrid-inverter). peak current of the panels is nearly 14A (https://www.jinkosolar.com/uploads/5ff587a0/JKM530-550M-72HL4-(V)-F1-EN.pdf)

I found some stuff from China that is a nominal 48v battery charger designed for charging LiFePo batteries which I am mulling over - about R3k. It even has CANBUS which would be great if it could be integrated to the CANBUS on the inverters & batteries, but according to a mate of mine that deals with CAN, it can be a minefield, so am contemplating just using the ATS trigger on the inverted to simply switch on/off the unit at the lower and upper thresholds. Manual change over between grid and generator will still present a problem, I think, since since the generators ability to reliably maintain 50Hz with load fluctuations will still exist. Two x 8kW inverters in parallel. I believe you are probably correct and something I considered, but: 1. I'm not sure this is something I could ask the wife or kids to do if I'm not there. 2. The smallish (+/-4.5kW actual) power of the genset, still presents the 50Hz synchronization issue as loads fluctuate.

I was also told you can mix the 5.1 and 6.4 kwh BSL batteries, but I've not see it in writing anywhere from BSL.suggest you email them and confirm. Unless your power usage is really minimal, 2x 5.1 will still get fully utilised. The other advantage is that if by some turn of bad luck a battery develops a fault, you least still have the other battery. Lastly, the 8kwh must be back breakingly heavy if you are racking yourself. If the 1C rating is important to you, just check thar the 8.2kwh actually is rated 1C. My 6.4kwh BSL batteries are, according to the datasheet I have only rated at 90A, whereas the 5.1kwh is rated at 100A.... I looked for a datasheet for the 8.2kwh BSL, but couldn't find one

Generally not so simple. Google it a bit, but in short, synchronization and harmonics can both cause problems, particularly if you are looking to use a small 2pole (3000rpm) genset.

Also consider portrait or lascape mounting if that creates more space. I have one strings one way the other the other to get them in the space I had avaliable and minimize shadding

Use the Vmp.

Perhaps Consider smaller panels, so you can fit a few more and get the voltage up?

Interestingly, the 5200w MPPT matches up with the single phase Deye and Sunsynk inverters, but the current limit and voltage do not - much higher voltage and much lower current allowance on the 3 phase units. This is unfortunate as it precludes the use of the larger 500w+ panels as the current will be too high, so lots of smaller panels in series

OK - that makes sense. For safety sake, why not send Deye a mail and ask them to confirm and then you know for sure.

Not sure how you arrive at those numbers - I was simply looking at the current split: 13A vs 26A so power will be double on the 26A MPPT compared to the 13A MPPT since all the specified voltages etc are identical. I would go so far as to guess that they simply have lumped 2off 13A MPPTs together and called it a 26A MPPT - probably because some part of the hardware/firmware/software can only handle 2 MPPTs. Regarding the lower power rating of the 10kW unit - it just means the max voltage at which the 13A can be used is lower and will be a limitation of some other section of their hardware.

your option a) according to their specs. I thought it was odd too when I 1st saw it. Seems to make sense when comapring to the rest of the range, but why they didn't simply make it 3x13A MPPTs I don't know

Thanks @zsde . Just reviewing the manual now. Got dedicated gen port and load limiting facilities as well as trigger. Manual seems a bit light on details of how the generator is ramped or if just bangs it on set load - will have to contact distributors as suggested.

G'day all, Any suggestions for budget inverters (3-5kw) that support 48v batteries that have support for a generator? Sort of like the Sunsynk that has a load ramping facility at generator startup as well as load limiting, but without the price tag. Thanks in advance

Kind of a silly situation - Inverter (VSD) being driven by another inverter - if there was more demand, there might be an integrated solution that would make more sense - grid tied inverter with variable frequency output. Anyway, my actual reason for responding - just cautionary note @Marv . You might be aware if this already, but if you have cause to deal with fans (I assume by 'air movement' you mean a fan of some sort) in future - especially bigger units, they are often high inertia machines and have longish run up times the startup current spike at 6-7x full load amps is accordingly long - this is particularly true of larger, slower running fans. i.e. they are under high mechanical load start. Obviously the above goes away with a VSD, I've seen a number of folk bitten with DOL starts on fans.

No on else that can offer some insights? Alternately, are there any 3kw low cost inverters that are generator friendly that could be re-tasked to this purpose? Or even an inverter where something has failed e.g. the MPPT has failed but the battery charging facility still works?