faulty controllers?

[sunny alex]

Thanks

thanks, it's appreciated.

Alex you can use either. MPPT controllers as a general rule can accept much higher voltages than PWM. However a PWM controller designed to work with 24 volt system has to be able to handle more than 37 volts, more like 50 or higher Voc.

[sunny alex]

steca pwm controllers

hi, you recommended the solar electric store to get my controller,i contacted them via email (Windsun@wind-sun.com) and they confirmed that they would not accept credit cards issued in Nigeria. while i was trying to see how else to get funds to them , T/T or what, some one suggested i visit a hardware store in the capital, Lagos, where i might get an imported original steca PWM controller. now the point is:

with Voc falling to 33.4V in bright sunshine, can it charge a 160Ah/24V battery bank, with a daily night load drawn of 40AH?the load is an 80w led light. works ONLY at night for 12 hours.

or should i proceed with the tedious process of T/T?
thanks.

thank you for your answer. thanks also for replying to my email.

we usually have problems buying from america because they usually do not accept credit cards from buyers in Nigeria, because of scam apparently. so honest people pay the price. paypal is not available here either.

sending money by t/t for small amount involves large bank transfer fees.

but any way thanks for the advice, came in handy.

have a nice day.

[sunny alex]

steca pwm controllers

hi, it was recommended that i go to the solar electric store to get my controller,i contacted them via email (Windsun@wind-sun.com) and they confirmed that they would not accept credit cards issued in Nigeria. while i was trying to see how else to get funds to them , T/T or what, some one suggested i visit a hardware store in the capital, Lagos, where i might get an imported original steca PWM controller. now the point is:

with Voc falling to 33.4V in bright sunshine, can it charge a 160Ah/24V battery bank, with a daily night load drawn of 40AH?the load is an 80w led light. works ONLY at night for 12 hours.

or should i proceed with the tedious process of T/T?
thanks.

sent this message to mike, hope one of you guys responds.

thanks a lot. it's been nice coming here for advice.

Alex you can use either. MPPT controllers as a general rule can accept much higher voltages than PWM. However a PWM controller designed to work with 24 volt system has to be able to handle more than 37 volts, more like 50 or higher Voc.

[Mike90250]

hi, it was recommended that i go to the solar electric store to get my controller,i contacted them via email (Windsun@wind-sun.com) and they confirmed that they would not accept credit cards issued in Nigeria. while i was trying to see how else to get funds to them , T/T or what, some one suggested i visit a hardware store in the capital, Lagos, where i might get an imported original steca PWM controller. now the point is:

with Voc falling to 33.4V in bright sunshine, can it charge a 160Ah/24V battery bank, with a daily night load drawn of 40AH?the load is an 80w led light. works ONLY at night for 12 hours.

or should i proceed with the tedious process of T/T?
thanks.
....

Load is 80w for 12 hours = 960wH @ 24V = 40ah consumed

Are you using an inverter to power this lamp, or directly off 24VDC ? If you use an inverter, add another 20% for losses.


Recharge:

2 panels are rated 225w, Imp= 7.61A, Vmp=29.65v, Voc=36.7V connected in parallel
we measured it's Voc at noon here in nigeria to be 33.2V.
insolation here is 5.5hours.

450 W x 5 hr = 2250wh - 50% system losses = 1125 Which should be just barely enough to recharge the battery, if there are no clouds.
MPPT will help with this goal by boosting the bulk part of the charge some.

[sunny alex]

thanks

Load is 80w for 12 hours = 960wH @ 24V = 40ah consumed

Are you using an inverter to power this lamp, or directly off 24VDC ? If you use an inverter, add another 20% for losses.


Recharge:

450 W x 5 hr = 2250wh - 50% system losses = 1125 Which should be just barely enough to recharge the battery, if there are no clouds.
MPPT will help with this goal by boosting the bulk part of the charge some.

thanks again, you have been very helpful.