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Let's say I mess up a bit and draw down my batteries to the Growatt's shutoff voltage overnight. Battery is not "dead" just resting. Everything would be working as it should but I just have no power. How do I get it turned back on the next (sunny) day? I do carry a 12v charger but would...

That sounds perfect. Have you actually used one?

Simple. Depends on how much voltage the BMS can handle. The better ones will do 48v. The cheap ones will fry.

Thanx. The batteries are SOK. A quality brand, fairly new. They say the battery is operating normally. The batteries started out fully charged and balanced. Since they are connected in series to get 24v it is impractical to check individual voltages regularly I got PVKeeper (then 2.0) with my...

Assuming MPP Solar is basically the same as my GROWATT (2x100aH batteries, 800w solar). Thanx guys for posting so many answers to what has been puzzling me. SOME QUESTIONS: (#1) If I accidentally run down my batteries at night when unplugged from utility one battery shuts down on low voltage...

AGREED. My recommendation would be to buy lots of long sleeve shirts to cover that bad, prison tat.

I doubt you have 80Amps AC available . Page 9 of manual recommends a 40 amp breaker. That's a big one. House breakers are typically 15-20A . An electric clothes dryer is 30A. The biggest campground plug is 50A. If you are running off a 15A house circuit that's what the unit will use. The 80A...

Thank you. Your response makes the most sense. I'm thinking people just want to avoid the "Big Spark" when they make that connection. (Can't blame them, It is scary) The YouTube experts use the resister the first time they hook up but I've never seen a dedicated charging circuit on the...

thanx. That works but I want to minimize the need to unbolt cables. I have an Anderson quick disconnect. I guess I could stick a pencil in there and use a wire on the other side before I push it back together..

Good idea. My little trailer will be loaned out to relatives and friends so I will be writing lots of signs and even a user's manual. But... Was it Henry Ford who said there was no such thing as foolproof because fools can be so ingenious?

Thanx. I think your suggestion is the winner. Easiest fix for me is to run a couple leads from the battery terminals to the bus with everything turned off. I store my resistor in a Ziploc bag taped to the side of my batteries. I'll just add some wire to the bag to keep everything handy.

Thanx all. Lots of good ideas which makes me curious why I've never heard of these things before. Never seen these extra reisitor circuits on any of the schematics Seems like a nice solution. Does it come in 4ga?. All I see online is 10ga.

Months ago I used a pre-charge resistor as recommended by Will Prowse and others . Worked fine. No spark. My question is .... If i ever disconnect or even switch off my batteries for any period of time would I have to use that resistor again because the capacitors have slowly discharged...

Months ago I used a pre-charge resistor as recommended by Will Prowse and others . Worked fine. No spark. My question is .... If i ever disconnect or even switch off my batteries for any period of time would I have to use that resistor again because the capacitors have slowly discharged...

To summarize: -Depends on what you are going to need power for. (winter vs. summer things). Optimize for that season. I use the NREL PV watts calculator. SImple, flexible and NOBODY WILL CALL TO SELL YOU STUFF. My latitude is 40 (Philly).Rule of Thumb would dictate a 40 degree angle year round...

Many years ago I was involved with the design of (lead acid) batteries for a missile silo. As I recall , our EMP parameter was "Could it resist an EMP pulse equal and opposite to the power of the battery?" We did not deal with a BMS but I am sure a civilian version of one would have to be...

Bifacials are different. (Sez Capt Obvious!) They like to be off the ground, near reflective surfaces and at an angle to let max light hit the back side. I would guess the value of adjusting the tilt would be less than for standard panels.

I have a small camper so 30A would be more than enough. I already have a 30A (3-prong) plug to mount in the side of my cargo van and most campsites are 30A so I guess the EZ/cheap/safe way to go is with the 30A Square D Load Center and a 30A breaker. (I am trying to avoid the big campsites...

Thanx. Yes, I'm having trouble find a "small, indoor box for a single pole 40A breaker". Ideally a single pole because I am not sure how to wire the more common 2pole breakers. I have a small Square D box but it has a 30A buss so a 40A breaker won't work with it.

The manual recommends a 40A breaker on the 120AC input side. (Between shore power plug and unit) I guess using an extension cord is fine at home where there's a breaker at the house panel but I don't trust campground power. Any source of supply would be appreciated. Preferably a small, indoor...

Still wondering why his BMS did not shutoff on low voltage. I just had a very similar problem with a new battery. Dropped below 10v doing capacity test.

Thanx. I do have a Buck converter for most DC stuff. but it only delivers 40A. This is America man. I want MORE!. But seriously, I also saw somewhere else that there is the pass-thru feature you mentioned. Scary that a socket could look like a 12v one but really be delivering 24. With my luck a...

Building a 24v system so I want to maximize 24v devices and minimize 12v/110v ones. Shopping. I'm seeing sockets (cigarette lighters) that say they are compatible with 12v/24v and have 24v USB ports. QUESTION: Can I SAFELY plug normal (i.e.12v) devices into the socket and 5v (phones) into the...