Suggestions for a "Plug and Play" AC coupled storage box.

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Cell-King

Member
Joined
Sep 23, 2019
Messages
58
I've built systems in the past which were DC coupled (the solar panels charged the battery via DC) but I was wondering if anyone had any resources for a battery system that is in a AC coupled configuration so that it could easily work with a microinverter situation?

I imaging a box with only a plug and a CT clamp coming out of it, you insert the plug into a socket and put the CT clamp around the mains. When the CT "notices" power leaving the house it scales up the battery charger to send the excess to the battery and when it notices a net house consumption rate it discharges the battery to minimise import.

I haven't come across anything that would work as a solution for this so I would be really interested in hearing if anyone knows of any projects like this?

I'm well aware of the other requirements such as BMS and backfeeding considerations through a plug (I wouldn't be looking to invert more than 1k watts) but I think a box such as this would be of great interest to people because of the number of houses out there that simply export everything to the grid and don't have net metering.

All replies are greatly appreciated.
 

chuckp

Member
Joined
Jul 29, 2018
Messages
402
I use APSystem micro inverters with a SOFAR Mass Energy AC coupled by-directional charger inverter. Could be something along the lines of what you are looking for.

 
Last edited:

Cell-King

Member
Joined
Sep 23, 2019
Messages
58
Hi Chuck, I'm only getting a chance to look at your post now but wow, it looks exactly like what I am talking about. It looks like it works well from your description, is that still the case? It seems quite pricey though, I bet because it's fully certified. Any ideas on where to get the cheapest price on it?
 

chuckp

Member
Joined
Jul 29, 2018
Messages
402
I got mine from Midsummer Wholesale I think the price has come down a little from when I purchased mine.


You might get a better price if you shop around. I used them because they had everything I wanted at the time.
It’s working great and I’ve no issues with at all using it with my DIY battery.
I have to use custom settings and the BMS has no coms with it. But it works very well.

i had heard of some people having problems with it when useing the python batteries but I believe that was a software issue that has now been resolved.
 
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