seneysolar
Solar Addict
Nice, 450Voc would certainly be useful.
Does your powmr mppt remain charging when inverter is off? Or is that only the 100Voc versions?
Existing Cabin Panel
- Thread starter indaUPeh
- Start date
Does your powmr mppt remain charging when inverter is off? Or is that only the 100Voc versions?
Yes. I have a review of it at: https://diysolarforum.com/threads/power-up-review-powmr-srne-pow-lvm3k-24v-h.65567/ Coming up on 1 year of operation in July.
Rednecktek
Solar Wizard
Yeah, I've been finding that only the older models have the 100-150v PV limits, nowadays everything and its uncle in the 48v world wants 150v just to start working.
I had the opposite problem, I needed something that would start and run in cloudy and overcast weather. Trying to string together enough panels to get that starting voltage was going to be real hard to do with the terrain at my camp and me having to do everything myself.
I don't understand why a cheap ass PWM or any MPPT controller off the shelf can start charging a 24v system, but I need 150v to charge a 48v system. Is 60v - 400v impossible to do or something?
I had the opposite problem, I needed something that would start and run in cloudy and overcast weather. Trying to string together enough panels to get that starting voltage was going to be real hard to do with the terrain at my camp and me having to do everything myself.
I don't understand why a cheap ass PWM or any MPPT controller off the shelf can start charging a 24v system, but I need 150v to charge a 48v system. Is 60v - 400v impossible to do or something?
littleharbor2
Solar Addict
PV panels make plenty of voltage in even poor light. Current, otoh, comes with the light's intensity.
Rednecktek
Solar Wizard
Uh huh... seen my 205w panels in series (47.8VoC) only hit 15v at noon...
littleharbor2
Solar Addict
205's, Those are pretty old panels. Sure there's not a problem in the array?
Rednecktek
Solar Wizard
Yeah, they can hit full voltage when there's sun out and I've also seen them pushing the 30a SCC they're attached to a couple times. Clouds and overcast in the PNW is a beast.
littleharbor2
Solar Addict
Oh yes, The PNW. Moved up to Vancouver Washington Jan - April 1980 . I don't think we saw the sun. Did see Mt. St. Helens do a slow burn and moved out shortly before it blew, May 18, 1980
