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  • Clearing SMA Sunnyboy 7.7 error code 3701, 3501

    Hope this helps somebody in the future. This has got to be the most difficult troubleshooting I’ve ever had to do with this inverter. Now, having solved it, the solution seems so simple. Short version If you found and fixed all the faults and the inverter still shows the 3701 or 3501 error...
  • Missing Sunny Boy Password Fix

    So, if you you got one of the newer (discontinued now) Sunny Boy inverters (3.8, 5.0, 6.0, 7.7, etc.) and there is a password already set and you don't know it, you need to get a PUK (Personal Unlocking Key) for the inverter. To get the key you need to give SMA the serial number of the...
  • Water distiller for lead acid battery?

    Walmart distilled water used to be $0.98 per gallon. Now it is $1.48/gallon. Looking at possibly getting a water distiller. Amaon has some in the $100 range. You still have to buy over 60gal at that price to pay for the distiller. Another problem is the quality of the distilled water. Once I...
  • Fixing Sunny Boy UV Damaged Screen

    Short version - use the Sylvania headlight restoration kit to get rid of yellowed sun damaged screen. Long Version - The headlights on my truck were really badly UV damaged. Got the Sylvania headlight restoration kit based on a good test by Project Farm on You Tube...
  • Good 18650 batteries on Amazon?

    Are there any good 18650 batteries on Amazon? I see too many with bad reviews and massively overstated capacity. I see that the 18650 battery store has a bunch, but trying to avoid shipping fees. Has anyone gotten any that are good and stated capacity is correct? Seems like there are a lot of...
  • Parallel strings and overpaneling or how to maximize PV production on a single inverter.

    Parallel strings and overpaneling or how to maximize PV production on a single inverter. In the past I was told that you could safely add 20% more panels to an inverter than the name plate rating, i.e. on a 5kw inverter, you could put 6,000 watts of PV panels. New SMA docs say you can overpanel...
  • How do Calif. Community Enegery Electric Generation Charges work with solar PV?

    It seems that the Community Enegery Electric Generation Charges "CEGC" stated around Sept of 2022. You automatically got put in and set up with you local provider unless you opted out and stayed with the utility. Before you had to (or could) pay the NEM the electric charges at the end of your...
  • Anyone using Sunny Island with the EG4 power pro battery successfully?

    Is anyone using a dual Sunny Island set up with the EG4 Power Pro batteries and BMS communication successfully? I’ve seen some threads but not exactly sure how successful those set ups were or still are. One post said you had to install a termination resistor, a BMS cable and put another...
  • What exactly do you need for a grid tied battery system that provides power during the night?

    Is there a plug in solution that you can set up to charge batteries during the day, then have the batteries power house loads at night while still being connected to the grid? Something that you could, say, plug into a dryer outlet or EV outlet that can then supply the night time loads all while...
  • Mounting solar panels on a 40 foot container?

    Looking at filling a vertical wall on a 40 foot high cube container with solar panels. Has anyone done anything like that? How did they mount them? Attaching two by fours to the container and then attaching the panels to that is the cheapest, but not sure how strong it would be. Unistrut would...
  • What is a good way to test a LiFePo4 battery if you only have basic equipment?

    I just got a Chins 100Ah battery at Walmart. Have 90 days return window. How to test it to make sure it is good and reliable? Have a Renogy current shunt, volt meter, clamp on amp meter, 10A LI battery charger but that is about it. Oh, have a 100A Harbor Freight battery tester. I use the LI...
  • Sunny Island Lithium Battery Summary?

    Does this look about right for options for using Sunny Island 6048-US with lithium batteries? When connection to a lithium battery: 1. Update SI firmware that has lithium battery option. Some SI don't list lithium battery in the battery options. Actual battery options: 1. Buy SMA approved...
  • These portable panels any good?

    These 200W portable panels any good? Prices seems pretty reasonable. For RV camping. The Xdays are a lot lighter. The JJI are glass and heavier. Both need support stands of some sort. Both 200W total. 50% off - $120...
  • Any recommendations for 12v 100ah lithium battery?

    Seems like prices for these are coming down a lot. This one was $100 more in Sept. ($399). Been looking at these types for a long time, but most all have some sort of issue (not rated capacity, bad bms, no low temp protection, etc.), so I've been waiting. Can anyone recommend a good one or 2 to...
  • Does anyone know why David Poz gave up on his Sunny Islands?

    Looks like he is testing Schneiders now. What was the reason he is not using the SI's anymore?
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