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Old 03-13-21, 07:57 PM   #1
nokiasixteth
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Default Ac coupled battery backup with solar

I have had my 5.2 kw solar system running for a few yrs now so far the grids been pretty reliable . But the thought of a power outage for even a day or two with me having perfectly good solar panels on my roof but useless had me thinking . So after some digging i found my solar edge grid tied system was compatable with curtailment from other inverters if they had that capability.

So i went ahead and added 2 small 42 volt 66 ah lithium batteries and a schnieder 4048 for a backup this works fine . To test to see if it would work hooked it to a backfeed breaker and shut the main breaker off outside to inside my house then turned the inverter on. This is where one problem arises i dont have a inside panel shutoff switch. It is on the outside.
One solution is obviously buy a new breaker panel and rewire the inside to it and add a generator interlocking kit.
Second solution possibly could be adding a another 100 amp breaker inside moving the main feed wireing to that breaker to feed the panel and have a seesaw type switch so that only one can be turned on at once .

Does any one have any experience in such being the indoor dont have a main off switch inside ?

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Old 03-20-21, 09:26 PM   #2
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Decided to go with the new breaker . SquareD with interlock kit will do a smaller sub panel for critical loads for everyday backup. But long term backup will be able to switch the interlock kit on and isolate my self from grid and Sw 4048 create the grid to provide power to my panels. Have my lines temporary as they will be changing just needed proof of concept first before i put more money into it. Also have a auto gen start in case or long term cloudiness i can turn the solar off and turn the generator on to charge the batteries if they get critically low.
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Old 03-21-21, 03:49 AM   #3
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Check with a local electrician, different states have different rules for what's gotta hookup how. Many wiring possibilities and only a few approved layouts. Plus it's high voltage utility power. I just went through the ordeal with a natural gas hookup. Tech came out, didn't like this. Redo this. Next visit, I don't trust your gage, go buy new. Next visit, shutoff this valve. Next visit, looks ok, now drop to like 3 psi or something. It took 2 weeks, and then we could finally go pay a small fortune for a gas meter. Yayyy!

Hey, how did the mini split grasshopper fried board end up? Never really heard anything about it.
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Old 03-21-21, 10:21 AM   #4
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Here in the sticks we have propane tanks n have to pump in sunlight . They may but it's doubtful. My person for interconnection came out and said my install was one of the best installs he has seen so far in this state . I'm pretty sure being it's a generator the interlocking kit would suffice being my place would be isolated from there grid during a power outage . I'll ask the juice company about that to.

The mini split . Ha I tried n failed the week all that cold came through I ordered it week before installed it n had it going for all that cold . I get time I will probably work on it again find a board or attempt to re solder some of those traces
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Old 03-21-21, 09:46 PM   #5
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Ok, don't hesitate to post it up on the other thread whenever you do something with it. I'll sure offer any help I can. Most all of the inverter mini splits have muscles in them like front load washers of the last decade or two. Just like HVAC, the appliance techs never do board repair, only remove and replace. It's a shame, because most of the stuff is an easy fix.
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Old 03-23-21, 07:45 PM   #6
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Im afraid that the board with all of those traces messed up is a bit above my skill level being i have not until that board soldered

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