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One thing with lithium is you need to verify the solar controller voltage is the same as what the voltage on the battery terminals are. If you don't plan to fully charge your battery its not a big deal, but if your like me and want maximum performance out of your battery, you need an accurate...

when I had a similar problem I was able to track it down to a sidepost bolt that was too short, this didnt allow the sidepost to tightend all the way down. When this happens the battery isn't fully charged, the alternator produces enough current to run everything while engine is running. Since...

I been carrying around my 25 pound fullriver 28ah agm for almost 8 years, recently I built 4x 10ah lifepo4 jumppacks and considered getting rid of the fullriver. But 3 weeks ago my van wouldn't start, I finally get to test my lifepo4 jump pack in anger. To my surprise it wouldn't jumpstart my...

I been using the chargery bms8t almost 6 months now on my 220ah 4s lifepo4. It has proven very reliable, once setup you don't have to mess with it again. The ability to use mechanical contactors/relays to shutoff power is a big plus when use with solar. Though it is capable of 1.2 amp balancing...

I use those 12 volt voltage stabilizer on my swampcooler which can't handle any voltage surges. They work extremely good, havent lost and fans/pumps since I been using them. I highly recommend them if your equipment can't tolerate any overvoltage surges. They work in realtime so it protects no...

You will appreciate the more power and simpler installation of one large panel. My 240 watt panel with the ecoworthy 20 amp mppt (100 dollars) put out about 12 amps mounted flat on my roof when the sun is overhead. That will easily keep up with your fridge.

If you set the fridge to 40 degrees and have good sunlight you can do it. I use to run a larger edgestar fp430 fridge 24/7 off of a 120 watt panel and 75ah agm. The only thing I see that might complicate things is the maxxfan since you run it all the time, it might prevent the battery from...

Instead of voltmeter I recommend a coulombmeter. Lifepo4 always has resting voltage reading of 13.1 volts. My 220ah lifepo4 is reading 13.1 volts but its down to 100ah of capacity. I would run the solar controller through a bms or at least an overvoltage protecion relay just in case. One note...

lifepo4 is expensive, average price is about 1000 dollars for 100 ah. If you can get 40ah lifepo4 for 200/300 dollar that wouldnt be too bad, a goalzero 400 lithium is in the 600 dollar range and that is also 40ah. 40 ah lithium is comparable to a 80ah lead acid and maybe weighs about 15...

on my ecoworthy 20amp mppt (240 watt solar panel) I rarely see more then 12 amps but the controller gets very hot. I've had a small 80mm cooling fan pointed at it during the day for years to keep it cool. 6 years later still runs hot when running but still works excellent. Its no big deal to put...

As far as building your own lifepo4, it could be done, but you need to build a small one first to learn the basics of how everything goes together, you need to have good soldering skills, maybe use a spot welder (cost 100 dollars for a 12 volt one), learn how to connect balance wires/fuse wire...

I build my own lifepo4 also, as soon as I notice one battery voltage is too low I always check everything. I also monitor balancing when charging, I never trust the bms to stop the charging. When I had something similar happen to me on a 3s50p pack li-ion pack, when stored two cell drained...

I been using these 0-99 volt overvoltage protection relay for years to protect my batterys. They have over/under protection, they sell on amazon for 13 dollars, I have mine connected to a 30 amp automotive relay, but you can trigger even larger relays. These are fully programmable and very...

something no one mention was voltage drop. Whatever profile you choose, check the voltage at battery terminals with voltmeter. Bounce that reading with what the solar controller is putting out. In my situation I had a 1/2 volt differential from controller to battery. Controller read 14.4 volts...

between solar panel and controller, when you disconnect the panel the controller will think its night time. If you put between controller and battery, when you disconnect the battery and you still getting power from sun (daytime) the controller will cycle back and forth. Here is a diagram...

with lead acid (agm) its ok to leave devices connected, lead acid always takes a charge. But never do it with lithium, I learned the hard way. PWM/MPPT controllers can produce voltages above 24 volts when they encounter a 12 volt battery they can't charge, they try to force a charge into the...

I got 2 x 110 ah lifepo4 connected together in parallel for the past year, I feed them with a 240 watt solar panel/20amp mmpt controller. I wouldn't even think twice about adding another one. I never tested full capacity of each battery but I doubt that each is 110 ah. Once the voltage of both...

on the victron, they got several versions the cheap one doesnt come with the doongle to adjust bulk voltages, you have to buy extra. But a newer version has a built-in bluetooth. You need to able to adjust the bulk voltage in case you have voltage drop from controller to battery. Another good...

1706 dollars in case anyone wants to know price.

I've connected a 27ah li-ion 3s16p (11.1 volt) to my 220ah lifepo4 13.3 volts (14 volts while charging from solar). The 27ah was around 11.8 volts when I connected it directly to the 220ah lifepo4 battery, I did have a dc wattmeter between both batteries to measure current being transfered. The...