Marktm wrote:May have missed it, but what have you found for the "L2H" unit? Several have used the Setec that operates at 220 VAC single phase:
here is my post on a small L2H. like my graphic shows mine is 1500w, enough for the fridge, furnace and sump pump. i'm not sure why i put so much thought into emergency power contingencies, in the last 7 years i've only lost power twice for more than a few hours.
Marktm wrote:I've wondered if using a center tapped xformer to produce 110 VAC split phase would have enough voltage to run most US based circuits. Total cost could be quite high for ~3000 watts power.
in my system layout you can see my idea to solve that problem, run two load centers, one for 220v loads, then from that 220 load center power a step down transformer for a second load center that is only 120v loads. this will always allow full power, where as a split phase situation will limit the 120v loads to 1/2 the max power if the loads are not balanced. industrial surplus stores have 1 3-7KVA phase 480/240 240/120 Xmers in the $20-$30 range. HGR will ship, but picking up will save on shipping. https://hgrinc.com/
also there is a setec 6KW L2H that is showing up on Alibaba, again 200v (japan?) output only, but its twice the power. i really like how it can charge too, so even as a home level3 it would be useful for us with the 3.3kw charger. only issue is with a 24-30kwh leaf with roughly 16-20 usable KWH, a 6kw or even a 3kw draw will suck the battery flat in hours. at least 1500w draw will last an 8 hour session.
https://www.alibaba.com/product-detail/ ... 3e5fwXD0Cr
BrockWI wrote:Yes almost all the MPPT controllers will max out at whatever they are rated for. I would suggest 6000w on that south face if you can get it, there might be an hour or so the MPPT will max out and not use some of the power, but the 2 hours either side of that you will get the additional power from the panels. In winter or hazy days or mornings or evening the extra panels would help out a bunch.
I did verify with the inverter supplier that this one i link to will support more than rated PV input, never more than rated power output, but it will serve to widen the peak power at mid-day. this will have to be stage 2, if and after i can get the 5.3kw peak PV stage 1 working. I ended up ordering 18x of the 295w peak panels instead of 280w.