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The system is grid tie with two inverters - SMA Sunny Boy 3.6 and SMA Sunny Island 4.4. The problem is the Sunny Island ramp up speed when charging. If there is drop in the sun (short cloudy condition, i.e. 30 seconds) and then full sun the system does not get to full speed in matter of seconds...

I'm looking for 15 or 30 kWh storage. Current offer is for REPT 280Ah, EVE 304Ah and CATL 302Ah. Can you, please, share some quick feedback on the different brands? CATL - I've used them and so far so good. EVE - I've been reading in the past for issues with low capacity on some LF280K, but...

I'm trying to reconfigure my SMA Sunny Island from increased self-consumption mode to increased self-consumption mode with backup. SMA offers the required equipment as a pre-build panel, but they state that customers can use an after-market equivalent. And here comes the issue - what can I use...

My inverter has two MPPT trackers that are rated for 15A max current per input and 20A DC short-circuit current. The MPPT voltage range is 130V to 500V. Currently, I have six 535W panels (Jinko Tiger Pro 535W) in a single string. The panel specs are: Maximum Power Current (Imp) STC 13.17A...

Let the build begin! For several months I've been planning the storage for my solar system. The inverter is SMA Sunny Island. The battery will be a DIY 48V 16S LiFePO4 one. The design will be pretty similar to the Seplos Mason one. The main difference is that the enclosure will be from plywood...

I ordered two different types of flexible busbars in order to compare them. Flexibility comparison is done without measurements. Just by the feeling I got while flexing them. The two types of busbars that I've tested are on the image below. The first is the laminated one from Weber Power Tech...

About 6 weeks ago I ordered 3 Seplos BMSes - 150A, 48V. These were needed for the DIY battery that I'm creating. Seplos failed to ship them on time. Alibaba "compensated" me with 10% refund in coupons. The shipment was "made" 1 day after the initial shipment period ended. I have paid for air...

DIY systems usually require some cable crimped with lugs at the end. So this should be kind of common knowledge I guess. I see two common pure copper tinned lugs and I'm wondering what are the differences. The first one is usually designed as SC. I.e. SC50-8 is a 50mm2 (AWG 1/0) lug with 8mm...

Soaring energy prices in EU gave the final push. I just ordered 15kWh batteries and SMA Sunny Island 4.4M. These will be used to extend the existing solar installation - 3kW solar panels and a Sunny Boy 3.6 inverter. The last push came today. Analyzing over a month of data showed that I'll not...

Today I got to the last step of commissioning my SunnyBoy SB3.6-1AV-41 (3.6kW inverter). Looking at the documents I see two PDFs with similar content, but with one major difference regarding the "normal" PV array connection. I have a single string of 6 535W Jinko PVs. Open voltage reads about...

I'm working on the design of my residential solar system. The Growatt SPH 6000 seems like a good fit. I'm aware of the service issues and I'll be getting from a local supplier that will enable warranty claims directly to him under the local jurisdictions (I'm in Bulgaria). All other options cost...

I'm looking for feedback on the approach I'm taking with my first LiFePo4 battery. A small one, but the idea is that this will prepare me for the next one (~8-10kWh) that will provide electricity for the household). The goal for the first battery is to replace a bulky 80Ah Exide Equipment Gel...