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I was multiplying Vmc to the temp differential times the number of panels and keeping that value below 450vdc which it is. In reality though I want to multiply Voc times the temp differential times the number of panels and keep that voltage below 450vdc instead of 500vdc. Now it makes sense.

Ok, So what is really want then is to use Voc multiplied by the temp differential at -40C/-40F multiplied by the number of panels and keep that value below 450vdc not 500vdc to be safe.

I had already wired them and had the charger on them before I saw your reply. I was able to charge at the 50A setting. The voltage started at about 13.5V and rose steadily. In less than an hour it made a sudden voltage jump, and then a second one. After that the clamp meter showed zero...

I have 10 more panels not installed. I also have a second charge controller. Sadly that circuit has a 10amp DC rated breaker on it already as I was only anticipating 5.2amp max through that circuit in its current configuration. I have some options though. I wanted to keep the voltage high...

I live off grid near the arctic circle. My current system is 12v with 10kwh of lead antimony batteries (5kwh at 50% DoD) with a 2k inverter and a 60amp mppt charge controller. I currently have 800w in panels connected. I'm maxed with the current controller at 12v. I have another 800w of...

I have a current shunt to measure SoC for all charging sources and loads. I'm not sure if the 3kw EG4 can track SoC using non-EG4 batteries as I'm using the LiTime 230ah 12v 4x in series. Thanks again for your helpful advice!

A 10c rating on my batteries at 48v is 21amps. 1,600w/58.4v = 27.4amps which is fine. Plus they will never actually see that much current. Two problems with lithium this far north: cold and shipping. Temps tomorrow will be about -40F and that's air temp not fake windchill temperature...

My 4x 230ah LTCP 12v LiTime batteries finally arrived here in Alaska. I checked each of the batteries when I first unpackaged them and they were all roughly 13.1v. I connected them in series and connected them to my new EG4 3kw 48v all in one unit. Everything worked as expected. I connected...

Thanks for your reply. To update I had a secondary charge controller connected to a small array that was still feeding a very small amount of current into the batteries at that point when I took the voltage measurements. With that little bit of current going in the voltages are: 13.3 13.3 13.3...

I verified that the charger, volt meter, and clamp meter all work as intended on the other batteries. That battery however does nothing.

18x Renogy 100w panels wired in series 24.3voc per panel 20.4vmp @ 25C voltage temp coefficient -0.28%/C current outside temp +12F/-11C coefficient 0.28x36 = 10.08% panel voltage 22.45v at -11C string voltage 404vdc at -11C also string voltage 434vdc at -40F/-40C which is what I spec'd for as...

That's open circuit voltage. I'm not measuring open circuit voltage. I'm measuring the voltage with a load connected.

I checked the voltage of all the batteries and they were all 13.15v out of the box. I know resting voltage is only an approximate SOC but it's hard to believe voltage that close would result in massively unbalanced batteries. The manual states they are 100% SOC at 13.33v so I'm not sure how...

I want to setup 3 pv arrays. A main array that will be pointing due south wired into my EG4. I want to setup two additional arrays: One facing due east and the other facing due west. Are there any issues wiring the east/west arrays in parallel (each array will be the same number of identical...

Ok, the EG4 manaul says Max PV array open circuit: 500vdc PV array: 120vdc-450dvc It's not clear why the voc and array max voltages are different then.

https://signaturesolar.com/eg4-3kw-off-grid-inverter-3000ehv-48/

I don't know! I'm asking you! I'm not doubting your logic, but if we use that the VOC and max PV array voltage should be the same value no?

Ok this makes sense. Sort of. Is it likely that above 450vdc the mppt controller shuts off like it does below 120vdc?

No I have not. Thank you for the further clarification. I can wire them in parallel and charge them but I can't use the EG4 since it only supports 48v sized batteries. I do have the "dumb" 12v charger but I cannot control the voltage output only the current. Again it's the style of charger...

It's only a red alert when we approach -40F!

Hello, I was looking at LiTime's battery sale. They only ship to lower 48 via UPS. I contacted their CS and they confirmed they cannot ship to Alaska. Looking at UPS/Fedex/USPS websites it's not clear if the batteries can be shipped to AK via ground. I know they cannot be shipped via air...

Perfect. Thanks. Thanks for the confirmation. Understood. Currently I have about 4 hours of daylight per day. This time of year anything not pointing directly south isn't going to get any sunlight. The summer solstice is another story as I will have 24 hours of daylight and could point...

I'm at 65.5 degrees north latitude.