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  • Two MN200 classics with breakers

    For those of you who have read my other posts you know I purchased a sma Prewired system from MN with two 200 classics then decided to go full SMA and do AC coupled. I don't need the classics and have removed them, their wires, breakers, sensors, etc from the control center. These have never...
  • DIY Large insulated water drain back tank?

    I have seen a lot of builds for DIY storage tanks as well as indoor koi ponds that seem to use wood, typically 2x6 on edge 6" OC bolted together and tied together with plywood on either side, and I was thinking of using scrap C Channel I have left over from building. The C Channel is 16ga...
  • (image intensive) Re-purposing Radian Load Center for Battery bank and SMA SI Load Center

    I picked up a Outback radian box (empty) and a Outback Radian Load center off Craigslist earlier this year for $150 and planned on using it but didn't know where ... Originally I thought the Outback Radian box had all the components in it but found out later it did not so I decided it would...
  • What generator works with SMA sunny island?

    I have a briggs and stratton storm protector 5500 which the SI reads as in spec but gets stuck at "warm" status till it finally errors out many minutes later with a backfeed error, default is 100w and 30sec. Does anyone have a list of approved generators for the SI? The SI is configured as...
  • Any way to commission a Sunny Boy without AC?

    In the manual AC input is marked as required for commissioning ... we planed on wiring up the SB and using the SPS output before we migrated the SI stack up there ... I am unsure what would happen if I put a gen on the AC input just to commission the SB but it doesn't seem like a good idea...
  • SMA Sunny Boy 7.7 v2?

    I have a NIB SB 7.7 and it is a "version 2" box ... no indication of anything different in the manual and it still appears the wifi is not included yet ... anyone know what the difference is between this and I assume the SB 7.7 v1 ?
  • resting SoC in Battery Backup system and battery health

    If this has been discussed before I would love a link to the discussion ... I couldn't find it with several searches I tried. With LiFePo4 batteries what is the preferred resting SoC for a battery backup system ? Should I be cycling the battery every X days down to a certain SoC and then...
  • free standing service panel (pedestal)

    I am installing my panels on concrete ballasts because of ledge issues and not wanting to pour concrete. I got my trench in and conduit uprights and lines in place ... but now I need to think how I am going to mount the panel (normally plywood with two posts in the ground) to so I can get the...
  • shared neutral from combiner box?

    Not sure if this is a "thing" or not ... 1 combiner box with 2 outputs to two separate charge controllers and 1 shared neutral ... like a 2-2-4 AL URD cable to blocks torqued to spec with copper going the rest of the way. If someone did this would you calculate voltage drop using the 4awg wire...
  • Batrium SMA Sunny Island Integration issue?

    This is preliminary but trying to rule some issues out if others have or have not had them. Feedback and testing suggestions welcome. Issue: Load shed relay tripping off then immediately back on The SMA SI shows LoBatMod1 warning in the logs, this is set to 25% SOC as start and 29% SOC end...
  • BMS with programable relays triggered by external event?

    Question: Is there is any BMS which can allow a user to control its relays as if they were a multifunction relay and trigger those relays via external input. Background: I have a batrium core + expansion board already and it allows for two external inputs which I thought would be awesome for...
  • Might have fried my Batrium K9

    Unhooked the battery today so I could space the cells out then put it all back together and plugged the Cellmate back into the leads ... shortly after smoke ... and a sparking sound. I disconnected the leads ASAP and realized I forgot my protocol of always using the tester before connecting back...
  • Batrium SoC stays same as voltage creeps down

    Was originally thinking I wasn't going to need to post about this because the voltages were 3.4 when I first noticed this. I have my batrium setup to do ramped charging dropping the requested amps starting at 85% SoC to 15, 90%/6a, 95%/2.4a, 97%/0.6a respectively. This was done with the idea...
  • DIY solar hot water controller options?

    Has anyone DIY'ed their pump controller and if so what did you use? Inputs I want to monitor, log, and use to turn on / of pumps and or valves. 1) temperature at the top/bottom of the solar water tank, and at the output of the collectors. 2) temperature of water coming into an isolated DHW...
  • SMA sunny island turning off NAS?

    I have noticed in the last week my NAS has randomly turned off ... it is on a circuit powered by my SMA SI on AC1 where AC2 is connected to the grid. I am starting to think I need to put a UPS between the inverter and the NAS but even that IDK will work as it might not detect the frequency...
  • Ground Mounting Solar Evacuated Tubes

    Seeking resources on how best to do this, rules to follow, what to expect, etc. Like how many panels to put in a string, considerations for types of glycol and its ratings, considerations for what to do when you have stored all you can store / use, suggested materials, etc. There are a ton of PV...
  • preferred battery terminal connectors?

    Going to be assembling a DIY 48vdc EVE 280 battery here in the next couple of weeks and was looking for passthrough terminal post connectors and insulators. I will admit the ones I have seen on rack mounted units were attractive so it had me hunting for different options. What are people using...
  • Batrium Ramped Charging / Discharging

    Anyone play with the ramped charging yet? I have a SMA SI I am going to use as my remote, it has max Amp charging settings for gen and grid tied sources. Since I am going to have both my grid and gen go into AC2 ( which is the GEN input ... see thread here...
  • SOLVED: Batrium charging issue, seeking advice on debugging

    Problem: Charging > 20 amps on my 280Ah battery sometimes causes cell1 (negative) and often cell16 (positive) to spike over voltage. Patterns Noticed: When first charging every cell ramped up in voltage at the same time. It wasn't until voltages neared 97% SoC that cell 1 would be over...
  • WWYD 350ft run high/low voltage DC or AC

    Here is the decision I am trying to make. I currently have a SMA SI + E Panel + 2x MN 200's prewired NIB waiting to be installed with PV 350ft away. Details: We are currently building a new home, on this property we have an out building / greenhouse. The greenhouse is between the PV and the...
  • SMA PCB Terminal Block Connector Size

    Anyone have a link of a known plugable terminal block that fits the SMA SI's ? My Used SMA SI didn't come with terminal blocks installed so I was going to pick some up to be able to attach stuff to the relays. I think the spacing on these is 5mm, depth 7mm (I think they call this strip...
  • anyone recognize this brand of manifold?

    I believe this was installed in Maine or Vermont, I forget which, and I acquired it second hand from the guy who removed it from the dwelling it was installed on. I am trying to identify the manufacture so I can more easily find components I need to put it back in use. I tried to find a valve to...
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