Having enphase micro inverter system installed, how to AC couple diy battery pack?
- Thread starter Peter Nemere
- Start date
daromer
Moderator
- Joined
- Oct 8, 2016
- Messages
- 5,665
Guys. Let us be friends here now. We can all have different political stands and such but those parts are not anything that we need to went nor put on other people here.
So keep it at a level of friendly discussion instead. If climate partsisa conspiracy or not have nothing to do in this thread about micro inverters coupled with battery packs.
So back on track! :heart:
So keep it at a level of friendly discussion instead. If climate partsisa conspiracy or not have nothing to do in this thread about micro inverters coupled with battery packs.
So back on track! :heart:
Elmo said:
I don't see why conspiracy discussions (not really political wranglings ) should cause trouble ...any more than a discussions about whether fuses are necessary ...
I am aware , as indicated by my first post on this matter , that this is a firewall forum , and not the place for such topics ...The Davidickeforum is the best place , where you can find me most days.
Great to see APDis up to speed on this area of investigation ....
But back on the topic of micro inverters .... My main point is these are not a good idea ... particularly for powerwallers ... really the attraction is because geeks like us like to watch output of each panel via computer , and this is the only way to do it ... for non powerwallers it's a slightly better idea , but you are still guaranteed to lose money the way micro inverters are priced at present.
Peter Nemere
New member
- Joined
- Apr 1, 2017
- Messages
- 5
ozz93666 said:
Is the reason they're considered not good for powerwallers because powerwallers seem to have (from what I've read) one option in an integrated inverter that supports batteries - the MPP PIP4048?
It sounds like since Tesla has dropped the DC powerwall for most of the world (I think it's USA only now), the future of powerwalls will be to AC couple them. We need to find a reliable device we can do this with. The nice thing here would be this could be independent completely of the solar and inverter situation, as that (micro or string) generates AC power, the grid also provides AC, sounds like the batteries will come with an inverter and also produce AC - so we just need some kind of switching/power management device that can manage the power source for the load.
Eg it's 2am and you're using a microwave and sandwich press at the same time - 4000W, well your batteries might only output 2000W so need to draw the rest from the grid?
Or am I over-thinking it and should just installa PIP4048?
PeterNemere said:Is the reason they're considered not good for powerwallers because powerwallers seem to have (from what I've read) one option in an integrated inverter that supports batteries - the MPP PIP4048?
?
I would imagine most powerwallers don't have a grid connection ... I've noticed powerwalling is a very Aussie thing ... Australia is a big country ,many regions in the outbackwhere the grid doesn't reach ... this must be the reason .
Your post has highlighted very important issues ....I think many are drawn to powerwalls/solar from good motives but are not clear on their aims or how their situation affects things ...lets go over the different categories ... logic will dictate what is appropriate for each one ...
1.. Those with a reliable grid...This must be over 90% of people ,the grid never/rarely never goes down , when it does the short period of darkness is not a bother .... These people have no need for a powerwall !!!
They may like to get into solar , for them the only sensibleoption is to grid tie , either withmicro inverters , or one big grid tie inverter(cheaper) .... This should be a great idea if they got a reasonable price for the electricity they sold ... not too manybureaucratic expenses or other charges , and they bought their equipment direct (panels $0.5/W... inverters $ 0.15/W) and could wire it up themselves ... then it would make economic sense, perhaps a payback time of around 10 years.
2.... Those with unreliable grid...and who must have a back up ..for some reason they don't like petrol generator back up , a powerwall can store the energy needed during grid failures , a standard inverter is needed ... the powerwall can be charged when the grid is running .... no need for solar , those who are tempted to get panels will often get led into economic illogicalities ... the batteries will soon be charged , and then the temptation is to sell the excess power to the grid , and since the grid tie inverters are not operating all the time the payback on grid tie inverters(unless very cheap)will never happen.
3 ... Those with no grid or who want to cut off from the grid completely ...This is what powerwalling is about ... Before the advent of recycling laptop batteries this would be very costly .... DIY powerwalls has opened this area up!
The sensible approach is first to determine your power usage , buy the panels and one standard inverter..and build a BIG powerwall ,the bigger it is the more efficiently it will run , but more importantly , their will be times when many cloudy days come together , your powerwall will have to hold the power for those days when panels are only outputting 20% ... without a big powerwall you will have to have more panels , or suffer some days with restricted power.
But I don't think anyone has yet answered the question in the title of this thread .. .."micro inverter system installed , how to couple diy battery pack" .... my understanding is you can't ... best to keep them as two different systems.hm t o AC coupl
ozz93666 said:
I answered it in my first post.
SMA sunny island inverter
or Outback GFX / radian series
or Magnum energy
or hybrid inverter not UL1741 compliant in US
ozz93666 said:
Ummm...no.
The fact that you "liked" my post and then this statement makes me think you dont understand what I've been saying. Just like your inability to understand basic scientific truths.
So just to set the record straight, we dont agree.