info for old controller pwm

[frankz66]

Hi I have everyone, at a friend's house, an old hybrid PWM controller is installed I think, in 24v configuration. Its original configuration was composed of 2 90A 12v victron batteries in parallel for a total of 24 v - the controller I think is a 24 v, it has agm, gel, and the user parameter profiles. Can someone tell me if this controller supports lifepo4 at 24v from 100a or 200A (I would have a maximum of 2kwp of panels available in the future)? . I think I've already seen the management software a little around. Also in the user parameters I think it is possible to use the parameters of bulk , float , disable the equalization etc . I know it's a pwm...

 

[Rednecktek]

You mean 2 12v batteries in Series for 24v.

Yes, as long as you keep your solar input below about 50v and Vmp as close to 35v as you can there shouldn't be any issue. You'll just have to set your battery settings manually in USER mode.

 

[frankz66]

You mean 2 12v batteries in Series for 24v.

Yes, as long as you keep your solar input below about 50v and Vmp as close to 35v as you can there shouldn't be any issue. You'll just have to set your battery settings manually in USER mode.

Thank you , but the label of the scc indicate , "max 60 volts voc" and 50A ampere max for rated charge .. If I' upgrade panels ( 4 panels 12A isc and 50v voc and I configure there in parallel, I' have a 50v totals voc and 48A max . It is a good or bad ?

 

[Rednecktek]

That should be fine unless it gets stupid cold out, like Antarctica cold or wife's feet on the back of your thighs cold. The 50a max for the charge is what the SCC can pump into the batteries. You'll pretty much be giving the SCC all it can handle which should be fine.

That SCC can only use 32v so you'll only be able to get 32v × 48a = 1500w out of those panels. That's the advantage of MPPT over PWM. With MPPT being a fancy DC-DC converter it's watts in = watts out, so a (example math here) 500w panel producing 10a @ 50v on an MPPT would convert that to 20a @ 25v out the other end. With PWM it just cuts off any voltage over battery so your same 500w panel would only produce 10a @ 25v = 250w which is a helluva hit. Imagine instead if you could find a panel that produced 16.5a @ 30v, that would be 16.5a @ 25v into your battery, or 415ish watts. Much better match that way.

If you can find panels in the 30vmp-ish range, there'll be less cutting off of voltage and more amps going to the battery. The closer your panels Vmp to battery voltage is, the more effective your PWM controller is.

 

[frankz66]

That should be fine unless it gets stupid cold out, like Antarctica cold or wife's feet on the back of your thighs cold. The 50a max for the charge is what the SCC can pump into the batteries. You'll pretty much be giving the SCC all it can handle which should be fine.

That SCC can only use 32v so you'll only be able to get 32v × 48a = 1500w out of those panels. That's the advantage of MPPT over PWM. With MPPT being a fancy DC-DC converter it's watts in = watts out, so a (example math here) 500w panel producing 10a @ 50v on an MPPT would convert that to 20a @ 25v out the other end. With PWM it just cuts off any voltage over battery so your same 500w panel would only produce 10a @ 25v = 250w which is a helluva hit. Imagine instead if you could find a panel that produced 16.5a @ 30v, that would be 16.5a @ 25v into your battery, or 415ish watts. Much better match that way.

If you can find panels in the 30vmp-ish range, there'll be less cutting off of voltage and more amps going to the battery. The closer your panels Vmp to battery voltage is, the more effective your PWM controller is.

Thank you very very much !

 

[frankz66]

That should be fine unless it gets stupid cold out, like Antarctica cold or wife's feet on the back of your thighs cold. The 50a max for the charge is what the SCC can pump into the batteries. You'll pretty much be giving the SCC all it can handle which should be fine.

That SCC can only use 32v so you'll only be able to get 32v × 48a = 1500w out of those panels. That's the advantage of MPPT over PWM. With MPPT being a fancy DC-DC converter it's watts in = watts out, so a (example math here) 500w panel producing 10a @ 50v on an MPPT would convert that to 20a @ 25v out the other end. With PWM it just cuts off any voltage over battery so your same 500w panel would only produce 10a @ 25v = 250w which is a helluva hit. Imagine instead if you could find a panel that produced 16.5a @ 30v, that would be 16.5a @ 25v into your battery, or 415ish watts. Much better match that way.

If you can find panels in the 30vmp-ish range, there'll be less cutting off of voltage and more amps going to the battery. The closer your panels Vmp to battery voltage is, the more effective your PWM controller is.

I found the panel datasheet . My model is 450