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I think with the 4x40ah batteries connected in series you will have 12 volts at 40ah. Thats still a decent lithium powerbank, comparable to a goalzero 400 lithium (700 dollars). All you need is a bms and some balance connectors to finish it up. I would recommend a voltage stabilizer if you plan...

I been using the delgreen 4s active balancers (balances at 6 amps) for almost 2 years and they have been perfect. I don't notice the high pitch sound and the battery is maybe 4 feet from me, but some people might notice it. I been using a cheap 4 dollar 30a bms on my 220ah lifepo4, it works...

I had an edgestar fp430, in 24 hours when set to 40 degrees it used 26ah. I measured it with a dc wattmeter. That was about 5 years ago, maybe the newer 12 volt fridges have improved more in the meantime. That was in the summer in the back of my van when I took the readings.

With solar you never get 100 percent on lead acid, they always go to float too early. I leave my charge controller float setting at the highest setting. But the bad thing is voltage drop. You need to measure voltage at battery terminals and match that with what your controller shows. I had a .5...

Without a bms I would definitely get some active balancers (100 dollars) and an overvoltage protection relay(6 dollars). I found out lifepo4 cells go out of balance when fast charging, even when slow charging near the top end they go out of balance. The 4s active balancers I use balance all the...

that looks like a good deal compared to the goalzero 400 lithium (cost 700 dollars), they are both in the 40ah range. The goalzero uses li-ion cells (cylindrical laptop 18650) the flexopower uses lithium polymer which are flat cells (like cell phone batteries but larger). They both are fully...

As long as all the batteries or about the same voltage (around 12 - 14 volts) it will work, I do it all the time to top off my smaller batteries, just plug it into my house battery. I done it with my 18 ah jump pack, also 28 ah agm, I even plug in my 65 ah 11.1 volt li-ion. Amp current from the...

instead of a voltage meter get a coulomb meter. Something like the " DROK LCD Digital Multimeter Charge-Discharge Battery Coulometer Tester " they sell on amazon for less then 30 dollars. It counts amps going in/out of battery, if the day before you use 30 amps, you know next day you need to put...

I been using these small 5 dollar relays (dc 6-40v battery charger discharger) to connect/disconnect my battery. They are very programmable on whatever voltage (6-40 volts) you want it to trigger the relays. It has a built-in 10 amp relay which I use to trigger a larger 30 amp automotive relay...

it looks like the sb connector is where you charge from 12 volt adapter and also solar panel. It has a built in internal dc-dc charger. The coax input is where you charge with the wallwart.

With 200 watts of power the most you will get out of them with mppt is about 13 amps if you connect them in series and your battery is depleted and the sun is right overhead, normally if you get 10 amps that would be good. If you are getting less then 10 amps in your current system maybe mppt...

With lifepo4 if they read 13.1 volts they are probably good. They can be stored for years at that voltage. Rated 2000 to 4000 cycles, if they have built in BMS, no way to overcharge/discharge. It would take too long to capacity test 130ah. Maybe a quick charge/discharge to see if you can charge...

The specs I found on ebay, the ewt 50ah lifepo4 maxes out at 50 amps continuous discharge. I could not find if it had a pulse discharge limit. From the description it said they are for wind solar storage applications. On youtube someone took one apart its a 4s 15p made up of 26650 cells. The...

one bms you might want to look at is the chargery bms16, you can find on ebay for 100 dollars, its fully programmable. You can program the high/low cell voltage cutoffs. One thing it can do is trigger external relays, very important if you plan on using solar on 12 volt systems. You can put a...

I would also check for voltage drop between controller and battery. I get a .5 voltage drop on my system, I have to increase the mppt controller bulk setting by .5 volts to compensate otherwise it would charge at 14 volts ( almost float voltage) instead of 14.4 volts. It goes without question...

I have a 220ah lifepo4 battery pack, on mine all I use is a 6 dollar overvoltage relay that triggers a larger 30 amp relay when the battery reaches the cutoff voltage. Its all I ever needed. The 6 dollar relay will do everything the other units will do. On my battery pack I have active balancers...

I build my own lithiun battery packs, so getting a tesla module thats already buildup and ready to go, that will be easy to incorporate into your system. The power on those modules is tremendous for there weight and if you can them cheap, why not. For me the most important thing on a lithium...

The charge controller is only needed for the the panel, since its only a 24 volt panel, you only need a pwm controller, you can use mppt but it won't give you any extra amps. Is this the bp-220 you talking about? it looks like a battery isolator. Victron Energy BatteryProtect BP-220...

on those batteries I would crank up the bulk voltage to 14.6 volts or even higher, in the manual it said 14.2-14.6 volts , I don't know why they even put 14.2 volts as acceptable bulk charge rate. If you have voltage drop from the charger to the battery it will always be undercharging. On my 102...

You want an over/under voltage relay, those are only 6 dollars. I use those to control overvoltage on my lifepo4, but you can use it to disconnect your battery when the voltage reaches 12.1 volts. These are extremely accurate, they measure the voltage from battery terminals, I have mine...