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Emporia had been less expensive for me. It was only $400, but since it's UL and EnergyStar rated, my utility has a $500 rebate. I agree, reverse engineered control of the Emporia, still relying on their cloud that they could always decide to block, is brittle. To do the excess solar with...

Maybe an old thread, but good discussion. How did those CT clamp power switches work out? Could be useful for some cases. You mentioned Emporia, hoping to get them to offer a configurable excess solar or power measurement switch, not so likely I think... If you have any home automation...

The emporia EVSE has an open-source way to control it, still through the cloud, but can be done with local control. Need to have something to decide the desired charging current, and use the PyEmVue python library to send the command to the cloud, which then sets the EVSE current and on/off...

The emporia EVSE has an open source way to control it, still through the cloud, but can be done with local control. Need to have something to decide the desired charging current, and use the pyemvue python library to send the command to the cloud, which then sets the EVSE current and on/off...

I considered the open-evse, or making something even more DIY to create the SAE J1772 PWM signal. But the Emporia EVSE was less expensive, and while still requiring use of the cloud, there's an open source PyEmVue python library that can control the charger. For a standard sort of electrical...

I don't have any SMA PV inverters. The relay is 3PST. If it's running with some significant load through the relay, an IR camera on each of the internal wires of the relay might show if it's using 2 or 3 of the contacts. My cheapo IR toy is not good enough resolution to see. Maybe I'll...

I just had the transfer relay stick closed on the master inverter, with the 605 error. The inverters were passing through grid power and the grid must have gone away and come back. The slave turned off, displaying waiting for master and ready to start up. While the master remained on and...

Which inverters are you thinking to use?

There we go, now the SOC is correct! fun to watch. One of these days I'll look at this data and see how many Ahrs & kwhrs went in and out here. By eye, if taking out all the SOC resets shown, the real lowest SOC might have been around 70? So the original SOC estimate may be reasonable in...

222.11 set to 4 mV/dC I'm not sure what a typical value should be, but that seems to be near the general google range? I think this is what mine was set to initially from the DC Solar trailer. My forklift batteries are GNB Tubular LMX. I might try to make some plots sometime, I do...

Great idea! Increase that a little bit and see what happens to SOC resets.

This does look a little similar to what mine did today. It must be the solstice. https://diysolarforum.com/threads/sma-sunnyisland-6048-lead-acid-soc-estimation.75332/#post-956816 I'm not sure I'm following the plots and description perfectly, but, I don't think the Midnite SOC estimation...

It does look similar to @Trukinbear, in that it happened at about 46v while SMA SOC was relatively high, 75% for me, about 70% for Trukinbear My voltage was about 45.7v, and not so light load of 85A, when it reset SOC. And that's after moderately discharging for about 8 hours. FLA battery...

Wow, that was a big drop in the SOC estimation, from about 75 down to 20. Dropped into the battery protection mode and connected to the grid even though it was still on-peak hours. I just happened to notice looking at the monitoring. If the grid had not been available, it would have shut off...

If you already have a battery inverter, and want to dump power into a different battery, controllably, maybe this project, with some code modification. https://diysolarforum.com/threads/amazing-diy-mppt-scc.50939/

Seems like this would be able to have the code modified, and use as a wifi controllable buck power supply. When there is excess AC coupled solar, take the input power from my main inverter DC battery (SMA SI6048US w/ 48v FLA, take the power off the AC, try to put it in the FLA), and dump it to...

Sure they're not just GFI tripped? I wouldn't toss them until trying to reset that from your envoy.

Plenty of old micros are duds. Make friends with a solar installer, they may have piles of them in the woods behind their house, and you just need to plug them in one by one and see if they work. I made several trips like the picture here. My limit was the hand truck capacity per trip. Be...

I have had a handful of times where the micros connected to the Electrak tractor have tripped the ground fault detection. Maybe this is what you call resistance check fault. The fault can be reset using the Envoy. The micros set the GFI maybe randomly, I have theories about why, or maybe I'm...

Hah, Horrors! I thought they use a little power overnight, but I guess it's really mostly the Envoy using power overnight. I turn mine off at night! Since I made a contactor transfer switch for the main grid-tied array, I leave it off at night. Might save lifetime on the AC side capacitors...

What is this particular PWM module that you speak of? Oh I see now

Just found this thread, still reading the whole thing. For 2-3 years now, I've been using old m190/m210 microinverters to discharge 10s and 14s Leaf cell battery banks now totaling about 30kwh, runs everything for a night or maybe two, depending on cloudy days. They are AC coupled into SMA...

Some communities have zoning or rules preventing street-side solar.

Agree, although it's very conveniently understood how it works. Michigan lost net metering around 2019, and now use inflow/ outflow metering called distributed generation. Inflow you pay whatever the rate you're on. Outflow get credit (currently) for the power supply or energy cost for your...

That's another idea. I've never measured how much water the HPWH gets out of the basement air.

Another SI6048 lithium battery bms option is a victron shunt with a raspberry pi running venus os, which can talk to the SI CAN bus reporting SOC to keep SI happy and operating properly. https://github.com/madsci1016/SMAVenusDriver and search in the forum here for @madsci1016 posts (the...

I guess a tankless electric is about the cheapest to install. A coozie should help a regular water heater. Mineral wool batt insulation and an old boat bimini cover. One day I'll set up temperature logging to measure the standby loss. In the mean time, I should just write down the tank temp...

I removed a nat gas boiler last winter, replaced with electric water heater as buffer tank, resistance heating only. Main heat when we're home is woodstove, so we only were spending $3-400 annually for gas. But last winter we replaced that heating load with grid banked electric which was all...

Wow that's 150A at 240v. Does it use several circuits? Hah, it does, 4x 40A, that'd be #8 copper, please remember to budget for that.

Two ideas I would consider (or have done) to accomplish using RV solar AC coupled back to a grid system. 1) Did this. Typical RV solar 2x 240w panels DC coupled to RV house battery (12v FLA) & inverter (2000w 120v) powering some AC loads in RV, for normal off-grid use. For grid-tie use...

Two ideas I would consider (or have done) to accomplish using RV solar AC coupled back to a grid system. 1) I did this. Typical RV solar 2x 240w panels DC coupled to RV house battery (12v FLA) & inverter (2000w 120v) powering some AC loads in RV, for normal off-grid use. For grid-tie use...

An SCR dimmer, https://www.amazon.com/10000W-Voltage-Regulator-Controller-Thermostat/dp/B085W43M7B plus a wifi relay board with the desired resistor(s) in place of the manual potentiometer. I'm using it to variably control a 3800w water heater element with excess solar. It's been working...

Yes, the front and rear are too close. I lowered the front panels but the angle as shown is the steepest that doesn't shade in winter. I haven't bothered tilting them this spring/summer. I didn't move the back row up yet because I'm leery of the wind from behind and hitting the fence behind...

it's a DC Solar trailer rack.... The rest of the trailer is in the garage, and the actual trailer was sold to some guy who took it to Alaska. This lists the sentences given out to DC Solar folks...

People went to jail for this ground mount. Welded braces on the panel mount arms so at least the front panels could be mounted lower for less shading of the rear panels. A little sketchy as far as supporting the panel frames widely enough, but send it. The miscellaneous panels on the...