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Thanks for the reply, I think I finally have my head wrapped this issue. Summer I over in AZ so the 900 watt AC load on this system will get retired for 6 months. I can leave the Battery Protect cutoff set just a bit below the recommended 50% DOD. Apparently if I am running an AC unit on my...

https://www.amazon.com/gp/product/B01KN7K48W/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1 I bought two of these 6-months ago and noted that they are $100 off or $350 for a 200amp battery right now on Amazon with free shipping for Prime. I tested mine with a shunt and at 75% discharge it hit...

I select “user” defined for battery and then am still trying to set the right voltages for bulk and float by trial and error until I get a normal, conservative fully charged voltage of 25.6v (what Renology recommends) on my 24v AGM battery bank. I’m still playing with it, but charging to 26v...

Time to move after this on but if a moderators chief job is to limit inappropriate behavior then posting this in a beginners section when a member had a question.... “I doubt it would make any difference. The text of what I said is pretty hard to misunderstand unless the intent is to...

I agree it’s good for battery life to leave a lifepo4 under a full charge, but you lose any top balance. When charging lifepo4 using a PIP you never get to 3.6v per cell. If the PIP won’t let the cells go that high using a PIP charger makes a BMS useless as it only kicks in to top balance at...

Mini splits can run on 800 watts and cool one small fully enclosed room, so the math is not too hard. My nonprofessional but personal calculations suggest you triple the solar panel wattage to run the AC during the day (2.4k). Double the battery capacity for the number of night watt hours you...

OK NM Will started with a nice concise setting list that unfortunately would not be great for Gel battery life. Can anyone condense the collected wisdom of all the responses by redoing his original table with more acceptable values? Thanks!

Thanks for the excellent description on earth ground rods set in the desert. In a way grounding a DIY solar setup on say a cabin with no other electrical on an empty lot seems easier than grounding an off grid home setup if any part of it is in your home. For an at home set up apparently I need...

I tested my second 200amp Renology Gel as I have the shunt now and wanted to insure they were both performing as expected. I got 2000 Wh taking it down to about 50%. With both batteries I have 4kWh of energy storage for $700. While they won’t last as long as LiFePO4s and they are massive your...

I have four 250 watt 37.5v, 8.68 amps panels now in run 3 in series (one disconnected). I’m considering putting four of them in parallel to get improved performance. I’ll do the math on the new wire gauge requirement first. So I’m trying to figure out if my MPPSOLAR can handle max 35 amps yet...

I bought 2-Renology 12v 200ah AGMs through Amazon (free shipping). They arrived at my work today as I wanted someone present when they arrived. Regarding the point made above on weight these things are heavy, 130 lbs each! With packing closer to 140 lbs. I'll need to drive back here tomorrow...

It’s a PIP 2424 VL MSD MPPsolar

I live a few mile north of Scottsdale with the same desire, off grid, AC. The compromise I made it to limited it to cooling one fully enclosed room which can be done with about 900 watts of power continuously. With a 300 amp 24 volt bank (two batteries, one at 24 v and 200amps one at 24 v and...

The battery is the must have to start it up, the solar input is not needed.

There is always more to the story. They were providing little power before my transfer switch in my MPP would low voltage cut off and move to utility power. I had the cut off at 12v under a light 150 watt load which was about 12.4v with the load off. I was concerned I got a bad battery and...

I have 8 of the generic used Chinese lifepo4 100-amp cells assembled into a 24v battery with a Daly 40 amp BMS. When charging the battery with my MPP Solar with correct lifepo4 settings I smelled a chemical fume right at the start of the charge, so I quickly switched them off. I checked the bus...

Thanks I did buy a shunt meter but its not connected yet. I have been using a Hall effect monitor not a simple volt meter. Its still hard to get a opinion on what voltage to consider in deciding your battery is fully charged as the voltage drops 0.8v or so when a charger stops or fully...

There is no need to have two independent units connected to one battery you use one PIP unit connected to one battery bank. If the battery bank is 12 volts, use the 12 volt PIP, if the battery bank is 24 volts use the 24 volt PIP. You do have to consider if your battery bank is huge what the...

Thanks for the input.

One other tip: I have used my dc power supply to add voltage to a cell when I had 5 cells bottom balanced pretty well and one cell with lower voltage than the rest. It was quicker to raise the low cell voltage a bit than lowering the other five to meet the low voltage cell. I am no expert but I...

Thanks for the advice and schematic. I posed this as a “shack” system, my loads never exceed 200 watts and run mostly at 110-120 watts. It’s enough to charge phones, run two 15 watt led desk lamps and a PC. There are a lot of low cost, non-programmable but decent charge controllers and...

Thanks for the advice. The batteries are now a bank of 8 lifepo4 100 amp. I’m adding a second bank of two Renology sealed gel 200 amp 12 v batteries that will go in series. I’ll use a 3 position marine battery switch, and reset the charging profile when I charge each. The system is used an AC...

Yes you can add a power strip or two and plug in all you want within the PIP limits. I have mine connected to two 15 watt lamps, a soldering iron, a PC, amplified PC speakers, a printer plus more all with their own plugs. Two desk lamps and a PC with good speakers comes in at about150 watts, you...

Perfect, exactly what I needed, and is what Ped was saying. But for those who did not see these links and reading about battery first! It was logical to think a disconnected battery would screw up a controller and the answer is, it simply is not an issue.

I live in the desert and wanted a be able to run a small one room portable AC at 900 watts continuously during a power outage. I pretty much used Will’s videos to guide me all the way. MppSolar 24v all-in-one, Daly BMS, 80 amp circuit breaker to the battery, lifepo4 100 ampHour Chinese sourced...

Thanks plenty to study and change over.

I have found that my MPP overcharges my Gel batteries on the default MPP "Gel" charge/float setting so I use the user defined MPP charge settings to keep them charged in line with what the manufacturer suggests (12.8V for gel) to maximize battery longevity. You do have to arbitrarily decide on a...

I'm not at all sure I agree with Denwa on this thousands use the MPP off grid. Just because there is a lot of on grid possible settings does not mean the MPP can't work perfectly with Battery/Solar only quite well. On "User" defined battery setting you can set the battery cut-off to any voltage...

No problem, in the mean time go to Tinkercad.com it’s free and simple to master. Geometric parts are really easy to make, and modify if they are not just right the first time. Watch a you tube or two on how to start and you’ll find it really fun to design your own stuff. I’ll still give it a...