Recent content by donsolarak

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...

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

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.

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

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?

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

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.

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

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...

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!

I'm at 65.5 degrees north latitude.

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...

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...

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...